Thailand Meteorological Department Issues Warning for Heavy Rainfall and Unstable Weather Across Southern Region and Northern Areas

Key summary

On October 25, 2026 (B.E. 2569), the Thailand Meteorological Department issued Announcement No. 4 (276/2569) warning of heavy to very heavy rainfall in the southern region and unstable weather conditions across northern Thailand. The alert covers the period from October 25 to October 28, 2026. Southern areas are expected to experience continuous rain with several locations facing heavy rainfall that could trigger flash floods, flash floods caused by mountain torrents, and waterlogging, particularly in hillside slopes near flowing waterways and low-lying areas. Meanwhile, northern Thailand will face unstable weather from October 25 to October 27, 2026, characterized by thunderstorms, strong gusts of wind, heavy rain, and possible lightning strikes. The northeastern region is expected to be the first to be affected, followed by the northern, central regions, Bangkok and its surrounding areas, and the eastern region in subsequent periods. The department advises residents in at-risk areas to exercise caution against thunderstorms and strong winds, avoiding open spaces, large trees, and unstable advertising signs. The weather conditions are attributed to high-pressure systems or cold air masses from China covering northern Thailand and the South China Sea, driving easterly winds that bring moisture from the South China Sea and the Gulf of Thailand into northern Thailand, combined with a strengthening monsoon trough crossing the southern region. Additionally, waves in the Andaman Sea and the Gulf of Thailand during thunderstorms will exceed 2 meters, prompting warnings for ships to navigate carefully and avoid areas with thunderstorms.