Nation Thailand
Monsoon rains raise flash-flood risk across upper Thailand
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The Thai Meteorological Department ( TMD ) issued an advisory at 5pm on Friday (August 28, 2026) on heavy to very heavy rain in upper Thailand, effective from Saturday (August 29, 2026) to Wednesday (September 2, 2026).
Key facts
- During the period, rain is expected to increase across Thailand, with isolated heavy to very heavy falls, particularly in the western parts of the North and Central regions, the upper and eastern parts of the Northeast, and the East.
- People should follow the department’s announcements; information is available 24 hours a day at tmd.go.th or by calling 0-2399-4012-13 or 1182.
- Wind and waves in the upper Andaman Sea will be rather strong, with waves 2–3 metres high and exceeding 3 metres in areas with thunderstorms.
- Waves in the lower Andaman Sea and upper Gulf of Thailand will be about 2 metres high, exceeding 2 metres in areas with thunderstorms.
Summary
During the period, rain is expected to increase across Thailand, with isolated heavy to very heavy falls, particularly in the western parts of the North and Central regions, the upper and eastern parts of the Northeast, and the East.
The monsoon trough is forecast to move south across the North and upper Northeast, extending into an active low-pressure cell over the northern coast of Vietnam and the Gulf of Tonkin.