Thailand
8 September 2025 - 14 September 2025The monsoon trough lay across the northern and upper northeastern regions in the first half of the week after that it moved southward to lie across the lower northern, central, eastern and lower northeastern regions before shifting southward to lie across the central, upper southern and eastern regions toward the low pressure-cell over the lower coast of Vietnam on the last day of the week. Additionally, the moderate southwest monsoon prevailed over the Andaman Sea, southern part and the Gulf of Thailand throughout the week. These conditions brought abundant rainfall over upper Thailand almost the week, inducing flooding in some places. In the southern region, rainfall occurred almost the entire week, mainly on the first day and the second half of the week.
Meanwhile, Typhoon “TAPAH (2516)” made landfall over Guangdong, China at 10:00 a.m. on 8 Sep. It subsequently weakened into the tropical storm and later into the tropical depression and active low-pressure cell over southern China in the evening of the same day. This storm strengthened the southwest monsoon which prevailed over the Andaman Sea, Thailand, and the Gulf of Thailand.
Region Weather Summary
8 September 2025 - 14 September 2025Northern
Scattered to fairly widespread rain especially on 10 Sep. Heavy rainfall occurred in some areas throughout the week with heavy to very heavy rainfall in some areas on 10 and 14 Sep. Flooding continued in Chiang Mai, Mae Hong Son, Phitsanulok, Phetchabun and Pichit provinces, and was additionally reported in Lampang province from 11-14 Sep. Lanslide occurred in Chiang Mai province on 10 Sep.
| Max Rain | Max. Temp. | Min. Temp. |
| 109.8 mm at Thap Phueng, Si Samrong Sukhothai on 10 Sep. |
Northeastern
Fairly widespread rain at the beginning of the week then scattered rain. Heavy rainfall occurred in some areas almost the week with very heavy rainfall in some areas on the first day of the week. Flooding was reported in Nakhon Ratchasima province from 8-10 Sep., Chaiyaphum and Roi Et provinces on 10 Sep.
| Max Rain | Max. Temp. | Min. Temp. |
| 135.3 mm at Tha Uthen Nakhon Phanom on 8 Sep. |
Central
Fairly widespread rain except for scattered rain from 11-12 Sep. Heavy rainfall occurred in some areas almost the week. Flooding continued in Phra Nakhon Si Ayutthaya province, and was additionally reported in Sing Buri and Ang Thong provinces from 9-14 Sep., Suphan Buri province from 10-14 Sep., Chainat province from 11-14 Sep., Nakhon Sawan and Uthai Thani provinces from 12-14 Sep.
| Max Rain | Max. Temp. | Min. Temp. |
| 84.8 mm at Tha Rue Phra Nakhon Si Ayutthaya on 9 Sep. |
Eastern
Fairly widespread rain except for scattered rain on 11 Sep. Heavy rainfall occurred in some areas almost the week with very heavy rainfall in some areas on 9 Sep. Flooding was reported in Chon Buri province on 8 Sep., Chanthaburi province from 8-10 Sep., Chachoengsao province from 9-14 Sep., Rayong province on 10 Sep., and Prachin Buri province from 10-11 Sep.
| Max Rain | Max. Temp. | Min. Temp. |
| 107.4 mm at Mueang Chanthaburi Chanthaburi on 9 Sep. |
Southern (East Coast)
Fairly widespread rain on the first day and the second half of the week and scattered rain on the rest days. Heavy rainfall occurred in some areas almost the week with very heavy rainfall in some areas at the end of the week.
| Max Rain | Max. Temp. | Min. Temp. |
| 118.0 mm at Chian Yai Nakhon Si Thammarat on 13 Sep. |
Southern (West Coast)
Fairly widespread rain almost the week with heavy rainfall in some areas.
| Max Rain | Max. Temp. | Min. Temp. |
| 71.0 mm at Mu Ko Libong Non-hunting Area, Kantang Trang on 12 Sep. |
Bangkok Metropolitan
Fairly widespread rain almost the week with heavy rainfall in some areas in the first half and the last day of the week. Flooding was reported in Samut Prakan province from 8-10 Sep. and Nakhon Pathom province from 11-14 Sep.
| Max Rain | Max. Temp. | Min. Temp. |
| 73.5 mm at Wat Bang Bon School Khet Bang Bon on 8 Sep. (66.6 mm at Bang Len Nakhon Pathom on 10 Sep.) |
Announcement Date 15 September 2025 11:41
