During the next three months (July-August-September), the total rains of the northern, central and northeastern parts are to be 5-10% above normal. While the total rains of the eastern part is to be near normal.

Furthermore, mean temperature is 0.5 - 1 C. above normal for almost all over Thailand.

For early July, almost all over Thailand will meet below-normal rain since the dry spell occurs. The total rains in July of the northern and central parts of Thailand are to be below normal. However, the total rains of the northeastern and eastern parts of Thailand are to be above normal.

Then in August, the northern part and the western portion of the northeastern part of Thailand will meet above-normal rain. On the other hand, the central and eastern parts, and the eastern portion of the northeastern part of Thailand will meet below-normal rain.

Afterward in September, the total rain of the Upper Thailand will be above normal.

During the next three months (July-August-September), the total rains of the Southern Thailand (East Coast) are to be near normal whereas that of the Southern Thailand (West Coast) is to be 10% below normal.

Furthermore, mean temperature is 0.5 - 1 C. above normal for almost all over Thailand.

For early July, almost all over Thailand will meet below-normal rain since the dry spell occurs. The total rains in July of the lower portion of the Southern Thailand are to be below normal. However, the total rains of the upper portion of the Southern Thailand are to be above normal.

Then in August, the lower portion of the Southern Thailand will meet above-normal rain. On the other hand, the upper portion of the Southern Thailand will meet below-normal rain.

Afterward in September, the Southern Thailand will meet below-normal rain.

During the next three months, the total rain is expected to be near normal for all parts of Upper Thailand whereas mean temperature is slightly above normal, mean maximum and mean minimum temperatures are slightly above normal for almost all of this period.
During late June until early July, the amount and distribution of rain will lessen. Thus, the dry spell will occur causing water shortage for agriculture at many areas.
Besides, in August, rain in Thailand will increase, especially at the northern, northeastern and eastern parts. As a result, flash flood may inundate at many areas.

During early and middle June, abundant rain appears with heavy to very heavy rain at many areas on some days, specifically at the northern and eastern parts. For wind waves around the upper portion of the Gulf of Thailand, they will be active as 2 – 3 meters high at some periods. The reason is that the southwestern monsoon prevailing over the Andaman Sea, Thailand and the Gulf of Thailand is rather active periodically and continuously. Additionally, a monsoon trough will place over the Upper Thailand at some periods.
Then during late June until early July, the amount and distribution of rain will reduce due to the prevailing southwestern monsoon over the Andaman Sea, Thailand and the Gulf of Thailand weakening.
During middle July until August, the amount and distribution of rain will become to increase. The reason is that the prevailing southwestern monsoon over the Andaman Sea, Thailand and the Gulf of Thailand becomes more active continuously. Furthermore, the monsoon trough will place over the Upper Thailand at some periods.

During the next three months, the total rain is expected to be near normal, whereas mean temperature is slightly above normal. Also, mean maximum and mean minimum temperatures are slightly above normal for almost all of this period.
Besides, in August, rain in Thailand will increase, especially west coast. As a result, flash and forest flood may inundate at many areas.

During the early and middle June, the Southern Thailand (specifically, the west coast) still meets abundant rain with heavy to very heavy rain at some areas. For wind waves in the Andaman Sea, they will still be active as 2 – 3 meters high while those in the Gulf of Thailand are 1 – 2 meters high. The reason is that the prevailing southwestern monsoon over the Andaman Sea and the Southern Thailand is active periodically.
Afterward, during late June till early July, the amount and distribution of rain will lessen because the prevailing southwestern monsoon over the Andaman Sea and the Southern Thailand weakens.
Then during middle July until August, the amount and distribution of rain will become to increase again since the prevailing southwestern monsoon over the Andaman Sea and the Southern Thailand becomes to be more active continuously.

Upper Thailand (Northern, Northeastern, Central and Eastern parts of Thailand):

Overview Prediction:
During the next 3 months, most total rain will be near normal except in May. Whereas that of the central and eastern parts and the Southern Thailand will be slightly above normal while more rain will firstly appear at the Southern Thailand since early May. Then, more rain will happen at the whole country from middle May onward. Since late June until early July, the amount and distribution of rain will lessen. For the mean temperature of Thailand, mean maximum and mean minimum temperature will be slightly above normal for the whole period.
Furthermore, during the first half of May, unstable weather occurs at the Upper Thailand as summer thunderstorms happening at many areas. Thus, property damages and loss of lives may occur. The public then should be cautious and prepare for the summer thunderstorms further.

Details are as the following:
During the first half of May, unstable weather occurs while sweltering weather appears commonly with very hot weather at some areas on some days. Except at some periods, thunder rain occurs at many areas because southerly or southeasterly wind prevails over the Upper Thailand for almost all of this period.
Afterward, during middle May until late June, the amount and distribution of rain will increase with heavy to very heavy rain at some areas on some days, specifically at the central and eastern parts. While wind waves at the upper portion of the Gulf of Thailand will become more active as 2 - 3 meters high at some periods because the prevailing southerly or southeasterly wind transforms as southwestern monsoon prevailing over the Andaman Sea, Thailand and the Gulf of Thailand. They will be active periodically together with a monsoon trough places over the Upper Thailand at some periods.
During late June until early July, the amount and distribution of rain will reduce for the prevailing southwestern monsoon over the Andaman Sea, Thailand and the Gulf of Thailand weakens.
During middle and late July, the amount and distribution of rain will increase again due to the prevailing southwestern monsoon over the Andaman Sea, Thailand and the Gulf of Thailand becoming more active. Also, the monsoon trough will move downward to place over the Upper Thailand at some periods.

Overview Prediction:
During the next 3 months, most total rain will be near normal except in May. Whereas that of the Southern Thailand will be slightly above normal while more rain will firstly appear at the Southern Thailand since early May.

Details are as the following:
During May until late June, increasing rain occurs at the western coast with heavy to very heavy rain at some areas. Whereas wind waves in the Andaman Sea will become more active as 2 - 3 meters high while those in the Gulf of Thailand are 1 - 2 meters high. These result from the prevailing southwestern monsoon over the Andaman Sea and the Southern Thailand becoming active periodically.
Then during late June till early July, the amount and distribution of rain will lessen since the prevailing southwestern monsoon over the Andaman Sea and the Southern Thailand weakens.
Later during middle and late July, more rain will appear again due to the prevailing southwestern monsoon over the Andaman Sea and the Southern Thailand becoming more active.

Overview Prediction:
During the next three months, mean maximum temperature of the Upper Thailand is expected to be slightly above normal almost all of this period. Specifically, April is the hottest month as the extreme maximum temperature may reach 42 – 43 C. Moreover, mean maximum temperature around northern and central parts is about 37 – 39 C. while that of northeastern part is about 36 – 38 C. However, mean maximum temperature of eastern part is about 34 – 36 C.
For rain amount in April, the total rain is mostly slightly above normal. Afterward, the total rain is near normal.
Furthermore, during April until middle May, summer thunderstorms often develop at many areas, especially around the Upper Thailand. In other words, thunder rain, gusty wind and hail often occur at many areas. These events possibly cause loss of life and property damages. As a result, the public should prepare for these summer thunderstorms further.

Details are as the following:
During April until middle May, sweltering weather happens commonly with very hot weather at some areas on some days. Extreme maximum temperature may reach 42 – 43 C. Otherwise, thunder rain occurs at many areas during some periods helping reduce some heat together with southerly or southeasterly wind still prevails over the Upper Thailand almost all of this period. In addition, some heat low-pressure air mass cells will develop at the Upper Thailand at some periods.
Then during middle May until late June, the amount and distribution of rain will increase with heavy to very heavy rain at some areas on some days, specifically at the western portion of the northern, central and eastern parts. For wind waves at the upper portion of the Gulf of Thailand, they will be more active as 2 – 3 meters high at some periods. These result from the southerly or southeasterly wind prevailing over the Upper Thailand transforms to become southwestern monsoon prevailing over the Andaman Sea, Thailand and the Gulf of Thailand. Additionally, a monsoon trough may place over the Upper Thailand at some periods.
During late June, the amount and distribution of rain will lessen because the southwestern monsoon prevailing over the Andaman Sea, Thailand and the Gulf of Thailand weakens.

Overview Prediction:
During the next three months, mean maximum temperature of the Southern Thailand is expected to be slightly above normal almost all of this period. Specifically, April is the hottest month. Moreover, mean maximum temperature around 34 – 36 C.
For rain amount in April, the total rain is mostly slightly above normal. Afterward, the total rain is near normal. Firstly, rain will occur at the Southern Thailand during late April.

Details are as the following:
During the beginning and middle of April, rainfall distribution is still 20 – 30% of Thailand together with hot weather appears at some areas on some days. For wind waves at the Gulf of Thailand and the Andaman Sea, they are about 1 meter high due to the easterly or southeasterly wind prevailing over the Gulf of Thailand and the Southern Thailand almost all of this period.
Later, during late April till late June, increasing rain occurs at the Southern Thailand, especially at the western coast along with heavy to very heavy rain at some areas. Also, wind waves at the Andaman Sea will become more active as 2 – 3 meters high whereas those at the Gulf of Thailand are approximately 1 meter high. These result from the easterly or southeasterly wind prevailing over the Gulf of Thailand and the Southern Thailand transforms to become the southwestern monsoon prevailing over the Andaman Sea and the Southern Thailand.
During late June, the amount and distribution of rain will reduce because of the weakening southwest monsoon prevailing over the Andaman Sea and the Southern Thailand.

Overview Prediction:
During the next three months, mean maximum temperature is expected to be slightly above normal while April is the hottest month as extreme maximum temperature reaching 42 – 43 C. on some days. Whereas mean maximum temperature are about 37 – 39 C. at northern and central parts along with that of northeastern part is about 36 – 38 C. However, eastern part and the Southern Thailand is not so sweltering.
Most total rain will be slightly above normal. Together with summer thunderstorms often occur at many areas as thunder rain, gusty wind and hail at many areas, especially during March and April. These phenomena may cause property damages and loss of life. Nevertheless, rainfall will not be sufficient for usage at some areas, specifically at repeated drought areas outside irrigation zones. As a result, the public should effectively optimize water usage and prepare for the summer thunderstorms.

Details are as the following:
During the first half of March, warmer weather occurs with hot weather at many areas on some days while dense fog appears at many areas on some days with rainfall at some areas on some days. Furthermore, the northern and northeastern parts are still cool in the morning, especially at the upper portion. This results from weakly high-pressure air mass areas from China still prevailing over the upper portion of Thailand at some periods. Also, southerly or southeasterly wind prevails over the Upper Thailand commonly.
Then during middle March until April, sweltering weather occurs commonly with very hot weather at some areas on some days. Extreme maximum temperature may reach 42 – 43 C. but thunder rain occurs at many areas at some periods, thus helping reduce some heat. This results from the southerly or southeasterly wind still prevailing over the Upper Thailand commonly along with heat low-pressure air mass cells covering the Upper Thailand at some periods.
During the first half of May, weather will be unstable as thunder rain occurring at many areas and also sweltering weather happening commonly. Afterwards, more rainfall appears, specifically at the western portion of the northern, central and eastern parts. For wind waves at the upper portion of the Gulf of Thailand, they will be more active as 2 – 3 meters high. This results from the prevailing wind as the southern or southeastern wind over the Upper Thailand transforming to become the southwestern monsoon prevailing over the Andaman Sea, Thailand and the Gulf of Thailand.
Besides, at the second half of May, a monsoon trough places over the central and eastern parts at some periods.

Overview Prediction:
Since March until about late April, rainfall distribution occurs at 20 – 30% of the area with hot weather at some areas on some days. For wind waves at both of the Gulf of Thailand and the Andaman Sea, they will be about 1 meter high due to the easterly or southeasterly wind prevailing over the Gulf of Thailand and the Southern Thailand commonly.
Then during late April until May, more rainfall occurs at the Southern Thailand with heavy to very heavy rain at some areas, especially at the western portion. For wind waves at the Andaman Sea, they will be more active as 2 – 3 meters high while those at the Gulf of Thailand are about 1 meter high. This results from the easterly or southeasterly wind prevailing over the Gulf of Thailand and the Southern Thailand transforming to become the southwestern monsoon prevailing over the Andaman Sea and the Southern Thailand instead.

Overview Prediction :
During the beginning and the middle of February, fluctuate weather will occur at the Upper Thailand. Together with morning chilly weather and thick fog happens at many areas with thunder rain at some areas. Mean minimum temperatures are 17 – 19 C and 20 – 22 C at northern and northeastern parts consecutively. Afterwards, warmer weather will start to appear commonly with hot weather during daytime. Especially in April, very hot weather will occur at many areas with maximum temperature as 42 – 43 C along with thunder rain, gusty wind and hail at many areas. Except for the northern and northeastern parts, cool morning weather will still appear during March.
These events are due to cold air mass areas prevailing over the Upper Thailand from time to time confronting with occurring hot weather, mostly during February and March. Also, easterly or southeasterly winds will prevail over the Gulf of Thailand and the Southern Thailand during almost all of these three months. Furthermore, they start to transform to be prevailing southwesterly winds during late April.
Briefly overview: Temperature and rain prediction of the Upper Thailand during these three months will be slightly above normal.

During the start and the middle of February, fluctuate weather will occur commonly. In other words, warmer weather with thunder rain will appear at many areas and thick fog happens at many areas on some days, especially around mountainous areas. For northern and northeastern parts, chilly morning weather still appears while cool weather occurs at central and eastern parts. This results from moderately high pressure air mass areas from China still prevailing over the northern and northeastern parts periodically.
During late February until middle March, warmer weather will occur again with thick fog appearing at some areas on some days and hot weather happens at daytime. Whereas morning cool weather appears at the northern and northeastern parts while cool weather occurs at the central and eastern parts at some areas on some days, mostly at the upper portion. This results from prevailing high pressure air mass areas weakening discontinuously.
Then during middle March until April, sweltering weather occurs commonly with very hot weather at many areas on some days. Extreme maximum temperatures may reach 42 – 43 C. Except for some periods thunder rain will occur at many areas helping reduce some heat resulting from weakening high pressure air mass areas prevailing from time to time. In addition, southerly or southeasterly winds will prevail together with heat low-pressure air mass cells prevail over the Upper Thailand.

Overview Prediction :
For Southern Thailand, The amount and distribution of rainfall will reduce and begins to increase in April with hot weather at some areas on some days, mostly at the upper portion.
Also, easterly or southeasterly winds will prevail over the Gulf of Thailand and the Southern Thailand during almost all of these three months. Furthermore, they start to transform to be prevailing southwesterly winds during late April.
Briefly overview: Temperature and rain prediction of the Southern Thailand during these three months will be slightly above normal.

Since February until late April, the amount and distribution of rainfall will reduce as 20 – 30% of the area with hot weather at some areas on some days, mostly at the upper portion. For wind waves at the Gulf of Thailand and the Andaman Sea, they will be about 1 meter high due to easterly or southeasterly wind prevailing over the Gulf of Thailand and the Southern Thailand almost all of this period.
Then during late April, more rain appears especially at the western coast with heavy rain at some areas. While wind waves in the Andaman Sea will be more active as 2 – 3 meters high whereas those in the Gulf of Thailand are about 1 meter high due to southwestern monsoon starting to prevail over the Andaman Sea and the Southern Thailand.

Overall Prediction:
Thailand will meet chilly weather commonly in January especially at northern and northeastern parts with mean minimum temperature about 15-18 C. Together with very cold weather happens at some areas at the upper portion of both parts with possible frost at valleys and mountains on some days while cool morning weather occurs widely with mean minimum temperature around 20-22 C. at central and eastern parts.

At the end of February, a general increase in temperature appears. Whereas chilly morning weather occurs at the northern and northeastern parts with dense fog in many areas with mean minimum temperature about 17-19 C. and 20-22 C. respectively. But hot weather occurs during daytime continued throughout February until March that very hot weather areas appear. Mean maximum temperature in March around the northern and northeastern parts is about 36-38 C. Furthermore, the Upper Thailand will meet rain and thunderstorm at some areas with hail, especially in March.

Details are as the following:
In January, the northern and northeastern parts still meet chilly weather commonly with very cold weather at some areas on some days, especially at the upper portion. Furthermore, dense fog occurs in many areas on some days together with mountain tops or mountainous areas meet cold to very cold weather with frost on some days and dense fog in many areas. Moreover, the central and eastern parts will meet cool weather widely with cold weather at some areas mostly at the upper portion and dense fog in many areas on some days. Besides, thunderstorm and hail may occur at some areas during some periods together with wind waves around the eastern part are about 1 meter high due to rather actively high pressure air mass areas from China still prevailing over the Upper Thailand periodically and continuously. Additionally, westerly wind waves may pass through the Upper Thailand at some periods.

Then in February, weather will be variable as thunderstorm happens at many areas on some days, mostly during the 1st half of this month. Also, dense fog will occur at many areas because warmer weather happens. Whereas hot weather appears at many areas during daytime mostly during the 2nd half of the month, but the northern and northeastern parts still meet chilly morning weather even prevailing high pressure air mass areas from China over the Upper Thailand weakening continuously.

For March, hot weather occurs widely with very hot weather at many areas, mostly during the 2nd half of this month. Extreme maximum temperature may reach 42 – 43 C. But at some periods, thunderstorm will occur at many areas helping reduce some heat because the prevailing high pressure air mass areas weaken from time to time along with increasingly prevailing southerly or southeasterly wind. In addition, heat low air mass cells will cover the Upper Thailand at some periods.

Overall Prediction:
The Southern Thailand still meets heavy to very heavy rain in some places continuously, mostly at the first half of January. Also, hot weather appears at some areas, particularly at the upper portion.

Details are as the following:
About at the 1st half of January, the Southern Thailand still meets dense rainfall with heavy rain at many areas and very heavy rain at some areas, specifically at the eastern coast from Surat Thani province downward. Whereas wind waves in the Gulf of Thailand will be rather strong as 2 – 4 meters high while those in the Andaman Sea are about 1 meter high because of rather active northeastern monsoon still prevailing over the Gulf of Thailand and the Southern Thailand. Additionally, the Southern Thailand may be influenced by actively low pressure air mass cells moving near or pass the lower portion.

Then since the 2nd half of January until March, the amount and distribution of rainfall will reduce as 20-30% of the area and hot weather appears at many areas on some days. While wind waves in both of the Gulf of Thailand and the Andaman Sea are about 1 meter high because the prevailing northeastern monsoon over the Gulf of Thailand and the Southern Thailand weakens, and transforms to be prevailing eastern or southeastern wind instead.

During December 2016 and January 2017, the Upper Thailand will be generally cool or cold and colder than that of the past 2 – 3 years, While the mean minimum temperature of the Northern and Northeastern parts is about 15 – 17 C whereas that of the Central and Eastern parts is about 19 – 21 C. Besides, the extreme minimum temperature is about 6 – 7 C around the upper portion at both of the northern and northeastern parts. Moreover, the extreme minimum temperature around Bangkok Metropolitan and Vicinity is about 14 – 15 C. Furthermore, Northern and Northeastern parts may experience thunderstorms and hails at some periods.
While in the end of February the Upper Thailand will be warmer but with cool or cold morning weather.
During December until January, the northern and northeastern parts will be generally cool or cold, even with the coldest weather on some days at the upper portion with the extreme minimum temperature about 15 – 17 C, Whereas the central and eastern parts will experience cool weather generally with cold weather at many areas, especially at the upper portion with the extreme minimum temperature about 19 – 21 C. For mountain tops and mountainous areas, cold to very cold weather happens with frost on some days and thick fog at many areas. While wind waves at the sea around the eastern part will be about 1 meter high because high pressure air mass areas from China prevailing over the Upper Thailand periodically are mostly continuously active. Then in February, the unstable weather occurs, mostly at the 1st half of the month. Also, thunder rain happens on some days with thick fog at many areas whereas hot weather begins to appear at daytime. But the northern and northeastern parts still experience cool or cold morning weather because high pressure air mass areas from China prevailing over the Upper Thailand weaken discontinuously.

During December 2016 and January 2017, the Southern Thailand, dense rainfall occurs especially in December together with heavy rain appears at many areas with very heavy rain at some areas. Thus, flash flood will overflow at disaster-prone areas.
While in the end of February : the Southern Thailand experiences reducing amount and distribution of rainfall exceedingly.
During December until middle January, the Southern Thailand still experiences dense rainfall further with heavy rain at many areas and very heavy rain at some areas, specifically at the eastern coast from Surat Thani province downward. As a result, flash or forest flood will overflow at disaster-prone areas. For wind waves in the Gulf of Thailand, they are rather active as 2 – 4 meters high at some periods but those in the Andaman Sea are about 1 meter high because of the prevailing northeastern monsoon over the Gulf of Thailand and the Southern Thailand being active periodically. Additionally, a monsoon trough places over the lower portion of the Southern Thailand at some periods. Furthermore, the Southern Thailand is still influenced by actively low pressure air mass cells or tropical cyclones moving near or through. Then during the 2nd half of January until February, the amount and distribution of rainfall will lessen and wind waves in the Gulf of Thailand weaken causing wind waves in the Andaman Sea and the Gulf of Thailand to be about 1 meter high. This results from the northeastern monsoon prevailing over the Gulf of Thailand and the Southern Thailand weakens and changes to be the prevailing eastern or southeastern wind instead.

During November 2016 until January 2017, the temperature around Thailand will reduce and starts to be cooler or colder consecutively. Mean minimum temperature in the Upper Thailand will be colder than that of the last 2 – 3 years ago. During December until January, Mean minimum temperature in the Upper Thailand around 18 – 20 C. Whereas the Extreme minimum temperature around 6 – 7 C. in upper portion of Northern and Northeastern parts and around 14 - 15 C. in Bangkok and Vicinity. For amount and distribution of rainfall at the Upper Thailand is going to lessen almost widely for being in the winter season already,
In November, the amount and distribution of rain will reduce distinctly with more cool or cold weather. While the northern and northeastern parts will face up to cool weather almost widely with cold weather at many areas, specifically at the upper portion; mean minimum temperature about 19 – 21 C. Whereas the central and eastern parts will face up to cool weather at many areas, especially at the upper portion; mean minimum temperature around 22 – 24 C. Moreover, wind waves in the sea around the eastern part will be about 1 meter high. These phenomena occur since moderate to rather active high pressure air masses prevail on the Upper Thailand periodically. Then in December till January, cooler or colder weather will happen more. For the northern and northeastern parts, they will face up to cool or cold weather widely with very cold weather at some areas of the upper portion; mean minimum temperature around 15 – 17 C. While at the central and eastern parts, cool weather will appear widely with cold weather occurring on some days especially at the upper portion; mean minimum temperature about 20 – 22 C. Besides, wind waves near the sea of the eastern part will be about 1 meter high. Additionally, for the mountains and mountainous areas, the weather will be cold to very cold with frost possibly happening on some days and thick fog possibly appearing at some areas. These phenomena will happen because of actively high pressure air masses from China prevailing on the Upper Thailand periodically and more continuously.

During November 2016 until January 2017, Southern Thailand especially around the Gulf of Thailand will face up to abundant rain and is possibly influenced by tropical cyclones during November and December. Furthermore, the Southern Thailand will face up to heavy rain at many areas and very heavy rain at some areas specifically at the eastern shore (the Gulf of Thailand) during November and December. Also, flash flood will overflow at disaster-prone areas. While wind waves in the Gulf of Thailand will be active from time to time, they will be 2 – 4 meters high at some periods.
Since November until middle January, the Southern Thailand will face up to abundant rain further mostly in November and December, especially at the eastern coast from Chumphon province downward, as heavy rain at many areas and very heavy rain at some areas. Flash flood will overflow at disaster-prone areas. For wind waves in the Gulf of Thailand, they will be 2 – 4 meters high at some periods while those in the Andaman Sea are about 1 meter high. These phenomena will appear because the northeastern monsoon prevailing on the Gulf of Thailand and the Southern Thailand is continuously active from time to time. Also, the Southern Thailand will face up to the monsoon trough placing on at some periods and be influenced by some tropical cyclones moving near or through. Later during the 2nd half of January, the northeastern monsoon prevailing on the Gulf of Thailand and the Southern Thailand will weaken and starts to transform as prevailing eastern or southeastern winds. Thus, the rainfall at the Southern Thailand will reduce as well as wind waves in the Andaman Sea are going to weaken too.

During this coming October until December, the total rain of the Upper Thailand (Northern, Northeastern, Central and Eastern parts of Thailand) will mostly be near normal. Whereas temperature will mostly be near normal. Furthermore, since the 2nd half of October, the Upper Thailand will experience less amount and distribution of rain and starts to experience cool or cold weather more later.
During the 2nd half of October, weather will be unstable. Then, the amount and distribution of rain will reduce with morning cool or cold weather starting to appear; mostly at the northern and northeastern parts, while wind waves around the eastern part are about 1 - 2 meters high. These result from the prevailing southwest monsoon becoming weak and changing to be the prevailing northeastern monsoon instead together with high pressure air mass areas from China beginning to prevail over the northern and northeastern parts from time to time.
For November till December, the amount and distribution of rain will lessen with more cool or cold weather appearing whereas wind waves around the coast of the eastern part are about 1 meter high. These phenomena are caused by high pressure air mass areas from China starting to prevail over the Upper Thailand periodically and more continuously.

During this coming October until December, the total rain of Southern Thailand will be above normal whereas temperature will mostly be near normal.The Southern Thailand will experience dense rain continuously, especially around the eastern coast (the Gulf of Thailand). While during October and November, the Southern Thailand will favor a high chance to be influenced by some tropical cyclones moving through or near. Thus, heavy rain will occur at many areas with very heavy rain at some areas. Consequently, flash flood will overflow at some areas.
In October, dense rainfall with heavy to very heavy rain occurs at some areas. While wind waves in the Gulf of Thailand will be more active whereas those in the Andaman Sea and the Gulf of Thailand are about 2-3 meters high at some periods. These phenomena result from the prevailing southwest monsoon over the Southern Thailand becoming weakening and changing to become the prevailing northeast monsoon over the Gulf of Thailand and the Southern Thailand including with a monsoon trough placing over the upper portion of the Southern Thailand at some periods.
While during November and December, dense rainfall appears further, specifically at the eastern coast (the Gulf of Thailand) with heavy rain at many areas and very heavy rain at some areas. Whereas wind waves in the Gulf of Thailand will be about 2-4 meters high at some periods but those in the Andaman Sea will be approximately 1 meter high. These phenomena are influenced by the prevailing northeastern monsoon becoming active periodically together with the monsoon trough moves downward to place over the central and lower portions of the Southern Thailand. Furthermore, the Southern Thailand may be affected by some tropical cyclones moving close or through.

During the next 3 months during September until November, the total rain will mostly be above normal, with a high probability to be affected by tropical cyclones in the South China Sea. While in September, abundant rainfall with heavy to very heavy rain will occur at many areas whereas flash flood will overflow at some areas. Later at the 2nd half of October, the rainfall will reduce and morning cool or cold weather starts to appear, especially at the upper portion of the northern and northeastern parts. For November, the amount and distribution of rainfall will lessen again and cool or cold weather happens more often.
September: Abundant rainfall distribution as 60 - 80% of the area with heavy rain at many areas and very heavy rain at some areas will occur. As a result, flash flood will overflow at some areas. For wind waves around the eastern part, they will be active as 2 - 4 meters high. They result from the prevailing southwest monsoon over the Andaman Sea and Thailand still being active from time to time. Moreover, a monsoon trough places over the central part, the lower portion of the northeastern part, and the eastern part at some periods. Furthermore, the Upper Thailand may be affected by some tropical cyclones moving close or nearby.
October: During the 1st half, weather will be unstable. Then, the amount and distribution of rainfall will reduce and morning cool or cold weather begins to appear, especially at the northern and northeastern parts. For wind waves around the eastern part, they will be about 1 - 2 meters high as the prevailing southwest monsoon weakens. Then during the 2nd half, the northeastern monsoon starts to prevail instead. In other words, high pressure air mass areas from China will prevail over the northern and northeastern parts periodically.
November: The amount and distribution of rainfall will lessen again with more cool or cold weather. The wind waves in the eastern part will be about 1-meter high because mostly rather active high pressure air mass areas from China will prevail over the Upper Thailand from time to time.

During the next 3 months during September until November, the total rain will mostly be above normal. Abundant rainfall with heavy to very heavy rain will occur at many areas whereas flash flood will overflow at some areas.
September: Abundant rainfall distribution about 60 - 80% of the area, specifically at the west coast (the Andaman Sea) together with heavy to very heavy rain at many areas will occur. And flash flood may overflow at some areas. While wind waves at the Andaman Sea will be active as 2 - 4 meters high at some periods whereas those in the Gulf of Thailand will be around 1 - 2 meters high.
October: Abundant rainfall distribution with heavy to very heavy rain still occurs at some areas while wind waves in both of the Andaman Sea and the Gulf of Thailand become more active as 2 - 3 meters high at some periods. This results from the prevailing southwest monsoon weakening and starting to change to be the prevailing northeastern monsoon over the Gulf of Thailand and the Southern Thailand instead. Furthermore, the monsoon trough will place over the upper portion of the Southern Thailand at some periods.
November: Abundant rainfall still occurs at the eastern coast (the Gulf of Thailand) further with heavy to very heavy rain at some areas. For wind waves in the Gulf of Thailand, they will be as high as 2 - 4 meters high at some periods while those in the Andaman Sea will be about 1 meter high. This result from the prevailing northeastern monsoon becoming more active together with the monsoon trough will move downward to place over the central portion of the Southern Thailand.

During this August until October, the total rain will mostly be slightly above normal. Whereas in August and September, the Upper Thailand will experience denser rainfall with heavy to very heavy rain at some areas influencing flash flood to overflow at some areas. While during some periods, increasing rain may happen due to tropical cyclones favoring to move pass the Upper Thailand.During the second half of October, the amount and distribution of rainfall will lessen and morning cool air starts to occur in northern and northeastern parts.
During August and September, dense rainfall appears as 60 – 80% of the area with heavy to very heavy rain at some areas. The total rain will be slightly above normal. While wind waves around the eastern part will be active as 2 – 4 meters high at some periods since the southwest monsoon still prevails over the Andaman Sea and Thailand continuously and actively from time to time. Additionally, a monsoon trough will place over at some periods and also tropical cyclones moving pass the Upper Thailand and the South China Sea may affect Thailand further. Then in October, weather will be unstable. The second half of October, The amount and distribution of rainfall will reduce and morning cool or cold weather begins to appear especially at the upper portions of both of the northern and northeastern parts. Whereas wind waves at coastal areas of the eastern part will be 1 – 2 meters high because the prevailing southwest monsoon weakens and changes to be the prevailing northeastern monsoon instead. Together with high pressure air mass areas from China will begin to prevail over the northern and northeastern parts periodically.

During this August until October, the total rain will mostly be slightly above normal. Whereas in August and September, the Southern Thailand will experience denser rainfall with heavy to very heavy rain at some areas influencing flash flood to overflow at some areas.
In August and September, the Southern Thailand will experience dense rainfall with heavy to very heavy rain at some areas, especially at the Southern Thailand (west coast). For wind waves at the Andaman Sea, they will be 2 – 4 meters at some periods whereas those in the Gulf of Thailand will be 1 – 2 meters high because of the prevailing southwest monsoon over the Andaman Sea and the Southern Thailand being active from time to time.
Then in October, the Southern Thailand will experience dense rainfall with heavy to very heavy rain at some areas. For wind waves in the Gulf of Thailand will be more active as 2 – 3 meters at some periods. While those in the Andaman Sea will be 1 – 2 meters high since the prevailing southwest monsoon weakens and starts to change to be the prevailing northeastern monsoon over the Gulf of Thailand and the Southern Thailand. Moreover, the monsoon trough will move downward to place over the upper portion of the Southern Thailand at some periods.

During 3 months in June to August, rainfall in the Upper Thailand will increase especially in August. Thus, flash flood and overflow will inundate at some areas. The total rain will mostly be near normal. Moreover, mean temperature of the Upper Thailand will be slightly above normal.
In June, abundant rainfall and heavy rain will appear at some areas mainly in the 1st half of June, especially around the eastern part and the western portion of both of the northern and central parts, whereas wind waves at the eastern part will be rather active as 2 -3 meters high at some periods. Due to the rather active southwest monsoon prevailing over the Andaman Sea and Thailand from time to time, also the monsoon trough will place over the northern and northeastern parts at some periods.
Then, during the 2nd half of June until middle July, the amount and distribution of rain will reduce greatly. As a result, the dry spell period will appear causing water shortage for agriculture at many areas, especially at the areas outside irrigation zones. For wind waves around the eastern part, they will weaken as 1 – 2 meters high since the prevailing southwest monsoon over the Andaman Sea and Thailand weakens. Additionally, the monsoon trough will move up to place over the southern portion of China.
Since middle July until August, abundant rain will reappear as heavy to very heavy rain at some areas. Flash flood, forest flood and overflow will inundate at some areas. Furthermore, wind waves at the eastern part will be active as 2 – 4 meters high at some periods because the prevailing southwest monsoon over the Andaman Sea and Thailand will be more active continuously. Also, the monsoon trough will move downward to place over the upper portion of both of the northern and northeastern parts.

During 3 months in June to August, rainfall in the Southern Thailand will increase especially in west coast. Thus, flash flood and overflow will inundate at some areas. The total rain will mostly be near normal. Moreover, mean temperature of the Southern Thailand will be near normal.
From June until August, abundant rain still occurs especially at the Southern Thailand (the West Coast). Together with heavy to very heavy rain happens at some areas with forest flood, forest flood and overflow inundating at some areas. Besides, wind waves at the Andaman Sea will be rather active as 2 – 4 meters high at some periods. While those at the Gulf of Thailand will be about 1 meter for the prevailing southwest monsoon over the Andaman Sea and the Southern Thailand will be rather active periodically.

During May, more rain will occur with very heavy rain at some areas, especially around the eastern part & the western portion of both of the northern and central parts. Whereas wind waves at the coastal sea of the eastern part will be more active as 2 – 3 meters high due to low pressure air mass cells developing at the Andaman Sea at some periods and then strengthening toward depressions or cyclones. Further, they will move northerly to easterly toward the western portion of Thailand. Additionally, the southwest monsoon will prevail over the Andaman Sea and Thailand, especially during the 2nd half of this month the monsoon will be rather active. Moreover, a monsoon trough will place over central and eastern parts at some periods.
In June, abundant rain still appears with very heavy rain at some areas. Wind waves at the coastal area of the eastern part are still active as 2 – 3 meters at some periods. The southwest monsoon still prevails over the Andaman Sea and Thailand rather actively, especially during the 1st half of this month. Furthermore, the monsoon trough will move up to place over northern and northeastern parts at some periods.
During July, abundant rain still happens with very heavy rain appearing at some areas. For wind waves at the coastal sea of the eastern part, they are still 2 – 3 meters high during some periods due to the southwest monsoon still prevailing over the Andaman Sea and Thailand. The monsoon will be more active especially at the 2nd half of this month, together with at some periods the monsoon trough will move downward to place over the upper portion of the Upper Thailand again.
In May, the weather still swelters commonly with very hot weather occurring at some areas, mostly at the 1st half of this month. Thunder rain still increasingly appears while total rain is mostly slightly below normal. Whereas mean temperature will above normal. For June until July, total rain is mostly near normal whereas mean temperature will be slightly above normal.

From May until July, more rain will happen especially at the Southern Thailand (west coast) with heavy to very heavy rain at some areas. Wind waves at the Andaman Sea will be rather active as 2 – 3 meters high at some periods. While those in the Gulf of Thailand will be about 1-meter high due to the southwest monsoon prevailing over the Andaman Sea and the Southern Thailand will be moderately active from time to time.
In May, total rain is mostly slightly below normal. Whereas mean temperature will be slightly above normal. For June until July, total rain and mean temperature will be near normal.