Heavy Rain Warning Extended Through Four Regions, Bangkok Flooded
Heavy rain warnings extend across Thailand through September 13, with Bangkok and four regions facing flooding risks from accumulated precipitation and strong low-pressure systems channeling monsoon rains.
The Thai Meteorological Department issued its final alert on September 13, 2026, at 5:00 p.m. concerning very heavy rainfall across Thailand through September 13. On that date, the northeast, east, and eastern coast regions will see very heavy rain in some areas, while the lower central region including Bangkok and its vicinity, and the western coast will experience heavy rain in some locations. A high-pressure zone and cold air mass over northern Thailand are channeling monsoon troughs through the upper south, upper Gulf of Thailand, and east toward a strong low-pressure system off central Vietnam's coast. Moderate southwest monsoon winds continue to affect the lower Andaman Sea, lower south, and lower Gulf of Thailand.
Residents should be cautious of dangers from very heavy rainfall and accumulated precipitation that may cause sudden flooding and flash floods, particularly in foothill areas near waterways and lowlands. Avoid traveling through routes with recurring flood problems, especially low-lying areas prone to short-term inundation. The strong low-pressure system near central Vietnam's coast is expected to intensify and move closer to northern Vietnam between September 13-14, 2026. Members of the public are advised to monitor weather forecasts continuously and plan their activities and travel carefully during this period.
Forecast rain-affected provinces by September 13, 2026: Very heavy rain expected: Nakhon Phanom and Ubon Ratchathani (northeast); Trat (east); Chumphon and Surat Thani (south). Heavy rain expected: Bueng Kan, Udon Thani, Sakon Nakhon, Khon Kaen, Kalasin, Mukdahan, Maha Sarakham, Roi Et, Yasothon, Amnat Charoen, and Si Sa Ket (northeast); Kanchanaburi, Ratchaburi, Nakhon Pathom, Samut Songkhram, Samut Sakhon, Bangkok and vicinity (central); Chachoengsao, Rayong, and Chanthaburi (east); Phetchaburi, Prachuap Khiri Khan, Nakhon Si Thammarat, Phatthalung, Ranong, Phang Nga, Phuket, Krabi, and Trang (south).
Weather forecast from 6:00 p.m. today through 6:00 p.m. tomorrow: North: Thunderstorms in 30 percent of areas, mainly Tak, Kamphaeng Phet, Phichit, Phetchabun, and Phisanulok provinces. Lows 21-27°C, highs 32-37°C. Northeast winds 10-20 km/h. Northeast: Thunderstorms in 70 percent of areas with heavy rain in some places, particularly Bueng Kan, Udon Thani, Sakon Nakhon, Khon Kaen, Kalasin, Mukdahan, Maha Sarakham, Roi Et, Yasothon, Amnat Charoen, and Si Sa Ket, with very heavy rain in some areas of Nakhon Phanom and Ubon Ratchathani. Lows 22-25°C, highs 27-30°C.
