Heavy rain threatens four Thai regions as monsoon trough shifts south
Thailand faces heavy to very heavy rain from August 30 to September 2 as the monsoon trough shifts south, raising flash-flood and run-off risks.
- A southward-shifting monsoon trough, combined with a strong southwest monsoon, is forecast to bring heavy to very heavy rain to parts of Thailand.
- Four regions are on alert for severe weather: the North, Northeast, Central, and East.
- Authorities have warned the public in at-risk areas of potential flash floods, rapid run-off, and temporary flooding.
- The period of heavy rainfall is expected to last from August 30 to September 2.
The Thai Meteorological Department (TMD) convened an urgent meeting to monitor weather conditions, forecasting increased rainfall and heavy to very heavy rain in several parts of Thailand from August 30 to September 2, 2026.
People in risk areas have been warned to watch for flash floods, rapid run-off and temporary flooding.
Factors behind the heavy rain
The monsoon trough has shifted southwards and is lying across the North and upper Northeast before extending into an active low-pressure cell over the coast of northern Vietnam and the Gulf of Tonkin.
At the same time, the southwest monsoon prevailing over the Andaman Sea, Thailand and the Gulf of Thailand has become fairly strong, resulting in increased rainfall across the country.
Areas requiring particular vigilance
- North: Western areas of the region
- Central region: Western areas of the region
- Northeast: Upper and eastern areas of the region
- East: All provinces in areas exposed to the monsoon
Advice and precautions for the public
- Watch for natural hazards: Be alert for flash floods, rapid run-off and short-term flooding, particularly in foothill areas near waterways and in low-lying locations.
- Avoid high-risk routes: Avoid travelling through flooded areas or along routes repeatedly affected by flooding.
- Follow weather updates: The TMD has teams monitoring and assessing conditions around the clock. The public is advised to follow official warnings closely and make timely preparations.
