Heavy Rain Forecast for Northern Thailand Oct 5-7
The Thai Meteorological Department has issued Warning No. 8 forecasting heavy to very heavy rain, strong winds, flash floods and forest runoff across northern, central, Bangkok, eastern and upper southern Thailand from October 5 to 7, 2026. The weather is driven by a cold air mass from China meeting the southwest monsoon over the Andaman Sea and Gulf of Thailand, raising sea waves above two meters. Residents are advised to avoid low‑lying areas, secure loose objects, and monitor updates through official channels.
On October 5, 2026, the Thai Meteorological Department announced Weather Variable Notice No. 8 (242/2569) for upper Thailand, effective October 5-7. The notice predicts thunderstorms, strong winds, and heavy to very heavy rain in some areas, affecting the northern, central, Bangkok vicinity, eastern, and upper southern regions, while the northeastern region will see reduced rainfall. On October 7, the western parts of the northern and central regions are expected to experience the weather. The pattern is caused by a high pressure or cold air mass from China extending over northern and upper northeastern Thailand, interacting with the persistent southwest monsoon over the Andaman Sea, southern Thailand, and the Gulf of Thailand. The department warns of possible flash floods and forest runoff, especially in low‑lying areas near waterways, and advises the public to avoid open spaces, large trees, and insecure billboards. Sea conditions in the Andaman Sea and Gulf of Thailand will worsen, with waves over two meters in thunderstorm areas; mariners should check routes and exercise caution, avoiding travel in stormy zones. An additional outlook for October 9‑13 indicates increased rain, heavy to very heavy in places, across the eastern, central, Bangkok vicinity, and southern regions. The public is urged to follow updates via the Thai Meteorological Department website http://www.tmd.go.th or phone numbers 0-2399-4012-13 and 1182, available 24 hours a day.
