Meteorological Department Issues Severe Rain Warning Across Thailand
Thailand's Meteorological Department issued its seventh severe rain warning through August 21, with heavy rainfall expected across northern and northeastern regions due to a monsoon trough and strong southwest monsoon, posing risks of flash
On August 18, 2025, the Thai Meteorological Department announced its seventh warning of heavy to very heavy rainfall affecting upper Thailand through August 21. A monsoon trough will pass over the northern and northeastern regions, combined with a strong southwest monsoon over the Andaman Sea, Thailand, and the Gulf of Thailand.
Residents are warned to be cautious of heavy rainfall and accumulated water that may trigger flash floods and flash flooding, especially in foothill areas near waterways and low-lying zones. Travel through chronically flood-prone routes, particularly low-lying areas that may experience short-term flooding, should be avoided. Small boats in the upper Andaman should not venture offshore during this period.
In the upper Andaman, waves will reach 2–3 metres from August 19–21, exceeding 3 metres in thunderstorm areas. The lower Andaman and upper Gulf of Thailand will see waves around 2 metres, exceeding 2 metres in storms. Mariners are advised to navigate with caution and avoid areas with thunderstorms.
Affected provinces include Chiang Mai, Chiang Rai, Phayao, Nan, Lampang, Tak, and Phrae in the north; Nong Khai, Bueng Kan, Nakhon Phanom, Sakon Nakhon, Mukdahan, Roi Et, Yasothon, Amnat Charoen, Surin, Sisaket, and Ubon Ratchathani in the northeast; and Trat in the east, among others, depending on the day. The public is urged to monitor updates from the Meteorological Department website (tmd.go.th) or call 0-2399-4012-13 and 1182 around the clock.
