Thailand
19 May 2025 - 25 May 2025The southwest monsoon prevailed over the Andaman Sea and western of Thailand accompanied with the southeasterly and southerly winds prevailed over the lower northern, northeastern, central, eastern regions and the Gulf of Thailand in the first half of the week. For the second half of the week, the southwest monsoon blew over the Andaman Sea, Thailand and the Gulf of Thailand was strengthened. Additionally, the monsoon trough lay across upper Thailand before moving southward to lie over lower central, eastern and upper southern parts on the last day of the week. These conditions caused plentiful rainfall in upper Thailand particularly heavy to very heavy rainfall in several areas in the second half of the week, accompanied by flooding in some places. Meanwhile, the southern region experienced abundant rainfall mainly along the west coast particularly in the second half of the week.
Region Weather Summary
19 May 2025 - 25 May 2025Northern
Fairly widespread rain except for scattered rain on 20 and 22 May with heavy to very heavy rainfall in some areas especially heavy to very heavy rainfall in several areas in the second half of the week. Flooding was reported in Phetchabun province on 21 May, Chiang Rai province on 21, 23 and 24 May, Chiang Mai and Lampang provinces from 23-24 May and Mae Hong Son province on 24 May.
| Max Rain | Max. Temp. | Min. Temp. |
| 120.0 mm at Doi Chang Forest, Mueang Chiang Rai Chiang Rai on 23 May |
Northeastern
Fairly widespread rain except for isolated to scattered rain on 19, 22 and 23 May with heavy to very heavy rainfall in some areas mainly in the second half of the week. Flooding was reported in Nakhon Ratchasima province on 19 and 21 May, Chaiyaphum province on 21 May and Nong Khai province from 23-25 May.
| Max Rain | Max. Temp. | Min. Temp. |
| 120.7 mm at Sakhrai Nong Khai on 23 May |
Central
Fairly widespread rain except for isolated to scattered rain on 19, 20 and 22 May with heavy to very heavy rainfall in some areas throughout the week. Flooding was reported in Samut Sakhon province on 24 May.
| Max Rain | Max. Temp. | Min. Temp. |
| 149.5 mm at Mueang Uthai Thani Uthai Thani on 24 May |
Eastern
Fairly widespread rain except for isolated to scattered rain on 19, 20 and 22 May with heavy rainfall in some areas almost the week and very heavy rainfall in some areas at the end of the week.
| Max Rain | Max. Temp. | Min. Temp. |
| 117.0 mm at Mueang Rayong Rayong on 25 May |
Southern (East Coast)
Fairly widespread rain on 21 May and at the end of the week, and Isolated to scattered rain on the rest days with heavy rainfall in some areas almost the week. Flooding was reported in Surat Thani province on 20 May.
| Max Rain | Max. Temp. | Min. Temp. |
| 80.0 mm at Chai Buri Surat Thani on 19 May |
Southern (West Coast)
Fairly widespread rain almost the week with heavy rainfall in some areas throughout the week especially heavy to very heavy rainfall in several areas in the second half of the week.
| Max Rain | Max. Temp. | Min. Temp. |
| 103.5 mm at Kapong Phang-nga on 23 May |
Bangkok Metropolitan
Fairly widespread except for scattered rain on 20, 22 and 23 May. Heavy to very heavy rainfall was observed in some areas almost the week. Gusty wind occurred in Pathum Thani province on 20 May. Flooding was reported in Samut Prakan province on 21 May and in Bangkok Metropolis on 21 and 24 May.
| Max Rain | Max. Temp. | Min. Temp. |
| 78.5 mm at Wat Dan School Khet Yannawa on 25 May (92.4 mm at Thetsaban 1 School, Mueang Samut Prakan Samut Prakan on 25 May) |
Announcement Date 26 May 2025 10:49