Thailand
11 May 2026 - 17 May 2026The high-pressure area from China extended its ridge to cover the northeastern region of Thailand and the South China Sea was weakened and mostly covered the South China Sea. Additionally, the southerly and southeasterly winds prevailed over upper Thailand at the beginning of the week. After that the southwesterly winds prevailed over upper Thailand. These conditions caused hot weather in several areas while rainfall occurred almost the week in upper Thailand with thunderstorm and gusty wind were reported in several areas. For the southern region, the easterly wind prevailed over the Gulf of Thailand and the southern region, which strengthened at the beginning of the week. After that, the southwesterly wind blew over the Andaman Sea, the southern part and the Gulf of Thailand in the second half of the week, causing abundant rainfall almost the week.
Region Weather Summary
11 May 2026 - 17 May 2026Northern
Hot weather mainly in the lower portion at the beginning and the middle of the week then hot weather nearly the whole areas. Widespread rain except for isolated rain at the end of the week with heavy to very heavy rainfall in some areas. Gusty wind were reported in Mae Hong Son province on 11 May. Flooding was reported in Lampang and Lamphun provinces on 12 May. and Phetchabun province on 14 May.
| Max Rain | Max. Temp. | Min. Temp. |
| 106.0 mm at Mueang Lamphun Lamphun on 13 May | 39.7 º C at Thoen Lampang on 17 May |
Northeastern
Hot weather nearly the whole areas almost the week. Isolated to scattered rain except for fairly widespread on 12 and 15 May with heavy rainfall in some areas almost the week and very heavy rainfall in some areas on 15 May. Gusty wind were reported in Ubon Ratchathani province on 12 May and Maha Sarakham province on 15 May.
| Max Rain | Max. Temp. | Min. Temp. |
| 110.0 mm at Phibun Mangsahan Ubon Ratchathani on 15 May | 38.8 º C at Sawang Wirawong Ubon Ratchathani on 15 May |
Central
Hot weather nearly the whole areas. Isolated to scattered rain except for fairly widespread rain on 13, 15 and 16 May with heavy rainfall in some areas almost the week and very heavy rainfall in some areas on 13 May. Gusty wind were reported in Nakhon Sawan and Sing Buri provinces on 15 May.
| Max Rain | Max. Temp. | Min. Temp. |
| 120.0 mm at Wat Sing Chai Nat on 13 May | 38.8 º C at Chai Badan Lopburi on 16 May |
Eastern
Hot weather in the upper portion. Fairly widespread rain in the first half of the week then isolated to scattered rain with heavy rainfall in some areas and very heavy rainfall in some areas on 12 May.
| Max Rain | Max. Temp. | Min. Temp. |
| 105.8 mm at Watthana Nakhon Sa Kaeo on 12 May | 37.1 º C at Khlong Yai Trat on 11 May |
Southern (East Coast)
Hot weather in some areas. Fairly widespread rain except for scattered rain on 15 and 16 May with heavy rainfall in some areas almost the week and very heavy rainfall in some areas on 12, 13 and 15 May. Gusty wind was reported in Surat Thani province on 11 May.
| Max Rain | Max. Temp. | Min. Temp. |
| 150.0 mm at Su-ngai Kolok Narathiwat on 12 May | 37.5 º C at Mueang Yala Yala on 13 May and at Mueang Nakhon Si Thammarat Nakhon Si Thammarat on 17 May |
Southern (West Coast)
Hot weather in some areas for few days. Fairly widespread rain with heavy rainfall in some areas almost the week and very heavy rainfall in some areas on 17 May. Gusty wind was reported in Krabi province on 16 May.
| Max Rain | Max. Temp. | Min. Temp. |
| 107.3 mm at Takua Pa Phang-nga on 17 May | 36.2 º C at Mueang Satun Satun on 13 May |
Bangkok Metropolitan
Hot weather nearly the whole areas. Isolated to scattered rain except for fairly widespread rain on 12 and 13 May with heavy and very heavy rainfall on 13 May.
| Max Rain | Max. Temp. | Min. Temp. |
| 44.1 mm at Thung Setthi Village Khet Prawet on 13 May (43.2 mm at Bang Phli Samut Prakan on 13 May) | 36.4 º C at Bang Na, Agromet. Stn., Khet Bang Na on 16 May (38.0 º C at Pathum Thani, Agromet. Stn., Khong Luang Pathum Thani on 15 May) |
Announcement Date 18 May 2026 11:19