Thailand rain warning covers Bangkok as monsoon trough shifts
Southern and eastern regions face continuous rain before rainfall increases in Bangkok and other areas, with flash flood and mudslide risks.
- Thailand's Meteorological Department has issued a heavy to very heavy rain warning for parts of the country from October 18 to 25, 2026.
- The weather event is caused by a monsoon trough that is shifting northwards over the central and southern regions of the country.
- Bangkok and the surrounding Central region are specifically forecast to experience heavy rain and gusty winds from October 21-25.
- Residents are warned of potential flash floods, mudslides, and runoff, particularly in low-lying areas and near foothills.
The Thai Meteorological Department has issued a warning of heavy to very heavy rain in Thailand from Sunday (October 18, 2026) to October 25.
The South and the East are expected to experience continuous rain on October 18–20, with heavy to very heavy falls in some areas.
Rainfall will then increase in the lower Northeast, the Central region including Bangkok and surrounding provinces, the East and the upper South on October 21–25, bringing heavy to very heavy rain in some areas and isolated gusty winds.
People in these areas should beware of gusty winds, heavy to very heavy rain and prolonged rainfall accumulation, which could cause flash floods, sudden runoff from higher ground and mudslides, particularly on foothill slopes near waterways and in low-lying areas.
They should avoid travelling along routes prone to repeated flooding, especially in low-lying areas where short-term flooding may occur.
The weather conditions will initially be influenced by a monsoon trough over the lower South and the southwest monsoon prevailing over the lower Andaman Sea.
The trough will subsequently shift northwards over the central part of the South, while a high-pressure system or cold air mass from China extends over the upper North, the upper Northeast and the South China Sea.
