TMD Warns of Heavy Rain, Flash Floods Across Thailand Oct 25-28

The Thai Meteorological Department (TMD) released Announcement No. 4 (276/2569) on October 25, 2026 at 05:00, warning of continuous heavy to very heavy rain in southern Thailand from October 25-28, with isolated torrential downpours. Accumulated rainfall may trigger flash floods and flash runoff, particularly in foothill areas near waterways and low-lying basins. Meanwhile, upper Thailand will experience volatile weather from October 25-27, featuring thunderstorms, gusty winds, heavy rain, and lightning, affecting the Northeast first, then the North, Central, Bangkok metropolitan area, and the East. The public is advised to avoid open areas, large trees, and unstable billboards. The weather pattern is driven by a high-pressure system from China covering upper Thailand and the South China Sea, strengthening easterly winds that bring moisture, while the monsoon trough across the South intensifies. TMD also listed 35 provinces expected to be affected daily, with very heavy rain forecast for provinces such as Phatthalung, Songkhla, Pattani, Yala, Narathiwat, Phuket, Krabi, Trang, and Satun on October 25, expanding to other regions on subsequent dates. Waves in the Andaman Sea and Gulf of Thailand may exceed 2 meters in thunderstorm areas; mariners should exercise caution and avoid sailing in stormy conditions. TMD urges the public to plan activities and travel carefully, monitor updates via the TMD website (http://www.tmd.go.th) or hotlines 0-2399-4012-13 and 1182. The next announcement will be issued on October 25 at 17:00.