The Thai Meteorological Department issued a weather alert for October 21 to 25, warning of heavy rain, flash floods, and landslides across the country. The advisory specifically flags risks in low-lying areas and foothill slopes near waterways.
Regional Risks and Meteorological Drivers
The Thai Meteorological Department (TMD) released Weather Advisory No. 8 (267/2026) on October 20, 2026. This warning highlights that accumulated rainfall could trigger flash floods, sudden runoff, and landslides between October 21 and 25. The danger is most acute on foothill slopes near waterways and in low-lying zones where water collects rapidly.
Forecasters predict continuous rain in southern Thailand during this window. Increasing rainfall will also affect the lower Northeast, the lower Central region including Bangkok, the East, and the upper South. Strong wind gusts may further destabilize conditions in these areas.
Marine Conditions and Safety Advisories
Waves in thunderstorm zones across the Andaman Sea and Gulf of Thailand are expected to exceed three metres. Vessels should proceed with extreme caution and avoid navigating through active storms. The TMD attributes the wet weather to a monsoon trough in the middle South, the southwest monsoon over the lower Andaman Sea, and a high-pressure system from China extending over the upper North and Northeast.
Residents and travelers must avoid routes prone to repeated flooding, especially in low-lying stretches. Planning daily activities with these disruptions in mind is essential. The next update from the TMD is scheduled for 5 am on October 21.
