Thailand
12 December 2025 - 18 December 2025The high-pressure area from China covered upper Thailand and the South China Sea throughout the period. In addition, another moderate high-pressure area extended its ridge to cover the mentioned areas in the second half of period. Meanwhile, the easterly and southeasterly winds prevailed over upper Thailand in the first half of the period accompanied with the passage of the westerly trough from Myanmar through the upper northern region and upper Laos on 13 Dec. and at the end of the period. These conditions caused cool weather over upper Thailand, particularly the northern, northeastern and upper central regions. Rainfall was reported mainly in the first half of the period. For the southern region, the moderate northeast monsoon which prevailed over the Gulf of Thailand, the southern region and the Andaman Sea was strengthened at the middle of the period. Moreover, the low-pressure cell covered the lower Gulf of Thailand and lower southern region on the first day of the period resulting in rainfall throughout the period mainly the east coast of southern region.
Region Weather Summary
12 December 2025 - 18 December 2025Northern
Generally cool weather with cold weather in some areas for few days. Cold to very cold weather in the mountainous areas and mountain tops. Frost was reported in Chiang Mai province on 16 Dec. Isolated to scattered rain mainly in the first half of the period then light rain for few days.
| Max Rain | Max. Temp. | Min. Temp. |
| 18.0 mm at Chat Trakan Phitsanulok on 13 Dec. | 15.0 º C at Umphang Tak on 16 Dec. (5.0 º C at Doi Inthanon, Chom Thong Chiang Mai on 18 Dec.) |
Northeastern
Generally cool weather with cold weather in some areas over upper part in the second half of period. Cold to very cold weather in the mountainous areas and mountain tops. Light isolated rain in the first half of period with heavy rainfall in some areas on 13 Dec.
| Max Rain | Max. Temp. | Min. Temp. |
| 54.9 mm at Mueang Nong Khai Nong Khai on 13 Dec. | 15.2 º C at Nakhon Phanom Agromet. Stn., Mueang Nakhon Phanom Nakhon Phanom on 16 Dec. (6.0 º C at Phu Luang Wildlife Sanctuary, Phu Ruea Loei on 14 Dec.) |
Central
Cool weather nearly the whole areas. Isolated rain in the first half of period.
| Max Rain | Max. Temp. | Min. Temp. |
| 16.8 mm at Lat Bua Luang Phra Nakhon Si Ayutthaya on 13 Dec. | 17.7 º C at Chai Badan Lop Buri on 16 Dec. |
Eastern
Cool weather in some areas. Cold weather in the mountainous areas and mountain tops. Isolated rain over the lower coastal areas on the first day of the period.
| Max Rain | Max. Temp. | Min. Temp. |
| 40.5 mm at Trat Highway District, Mueang Trat Trat on 12 Dec. | 20.2 º C at Koh Sichang Chon Buri on 12 Dec. (14.6 º C at Khao Kheow, Mueang Nakhon Nayok Nakhon Nayok on 16 Dec.) |
Southern (East Coast)
Cool weather in some areas. Scattered to fairly widespread rain with heavy to very heavy rainfall in some areas almost the period. Flooding continued from the previous period in Songkhla provinces.
| Max Rain | Max. Temp. | Min. Temp. |
| 130.8 mm at Mueang Chumphon Chumphon on 12 Dec. | 19.5 º C at Mueang Phetchaburi Phetchaburi on 12 Dec. |
Southern (West Coast)
Cool weather in some areas for few days. Isolated to scattered rain with heavy rainfall in some areas on 12 and 15 Dec.
| Max Rain | Max. Temp. | Min. Temp. |
| 66.0 mm at Khao Chong Botanical Garden, Na Yong Trang on 12 Dec. | 20.7 º C at Takua Pa Phang-nga on 12 Dec. |
Bangkok Metropolitan
Cool weather in some areas. Isolated light rain in Pathum Thani province on 13 Dec.
| Max Rain | Max. Temp. | Min. Temp. |
| 66.0 mm at Khao Chong Botanical Garden, Na Yong Trang on 12 Dec. (3.4 mm at Pathum Thani Agromet. Stn., Khlong Luang Pathum Thani on 13 Dec.) | 22.7 º C at Don Mueang Airport Khet Don Mueang on 12 Dec. (19.3 º C at Kamphaeng Saen Nakhon Prathom on 16 Dec.) |
Announcement Date 19 December 2025 10:31