TMD Warns of Heavy Rain and Floods September 17-20, 69

Thairath•Society•13h ago

Reader Briefing

The Thai Meteorological Department has issued a warning for heavy to very heavy rain across Thailand from September 17-20, 2026.

•The Thai Meteorological Department issued warning No. 3 (207/2026) regarding heavy rain and strong waves.
•Heavy rain is expected across Thailand from September 17-20, 2026.
•The North and Northeast will be affected first on September 17, 2026, followed by the Central, East, and South on September 18, 2026.
•The warning includes risks of flash floods, forest run-off, and high waves in the Andaman Sea.

•The Thai Meteorological Department announced the warning on September 16, 2026, with effects lasting from September 17-20, 2026.
•High pressure or cold air masses from China will cover the upper North and upper Northeast, causing the monsoon trough to move across the lower Central, East, and upper South.
•The southwest monsoon covering the Andaman Sea, Thailand, and the Gulf of Thailand will strengthen.
•The Thai Meteorological Department warns the public of flash floods and forest run-off, especially in slope areas near waterways and low-lying areas.
•The Thai Meteorological Department advises people to avoid traveling through routes prone to repeated flooding.
•Waves in the Andaman Sea are expected to reach 2-3 meters, and exceed 3 meters in thunderstorm areas.
•The Thai Meteorological Department advises sailors in the Gulf of Thailand and the Andaman Sea to navigate with caution and avoid thunderstorm areas.
•Small boats in the Andaman Sea should refrain from leaving shore between September 17-20, 2026.

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Thai Meteorological Department(กรมอุตุนิยมวิทยา)ℹ️

The agency that issued the weather warning regarding heavy rain and strong waves in Thailand.

Thailand(ประเทศไทย)ℹ️

The country experiencing heavy to very heavy rain and strong waves in the Andaman Sea and Gulf of Thailand.

Andaman Sea(ทะเลอันดามัน)ℹ️

The sea area experiencing strong waves and where small boats are advised to stay ashore.

China(ประเทศจีน)ℹ️

The source of high pressure or cold air masses moving to cover parts of Thailand.

Gulf of Thailand(อ่าวไทย)ℹ️

The sea area where sailors are advised to navigate with caution.