Thai Meteorological Department Warns of Heavy Rain and Flash Flood Risks Across Southern Thailand

Key summary

The Thai Meteorological Department (TMD) has issued a weather forecast warning for the period from 6pm on October 29 to 6pm on October 30, 2026. Heavy rain is expected in southern Thailand, with thundershowers covering 70% of the region and isolated very heavy rainfall anticipated in Prachuap Khiri Khan, Chumphon, Phuket, Ranong, Phang Nga, Krabi, and Trang. Isolated heavy rain is also forecast for Phetchaburi, Surat Thani, Nakhon Si Thammarat, Phatthalung, Songkhla, Pattani, Yala, and Narathiwat. The TMD advises residents to take precautions against flash floods and rapid run-off, particularly on foothill slopes near waterways and in low-lying areas. A low-pressure area over the Andaman Sea and easterly winds are contributing to these conditions, while a high-pressure system from China covers upper Thailand and the South China Sea. Mariners in the Andaman Sea and Gulf of Thailand are advised to navigate cautiously due to waves that could exceed two metres during thundershowers. In Bangkok and its vicinity, thundershowers are expected in 40% of the region with gusty winds, while upper Thailand regions like Kanchanaburi and Ratchaburi see a 30% chance of thundershowers. Temperatures across the affected areas are forecast to range between 21°C and 35°C.