ONWR Issues Flood Warning for Thailand: September 9–13

According to a report by Prachachat Business, the Office of the National Water Resources (ONWR) has released Announcement No. 3/2026, alerting the public to significant weather risks between September 9 and 13, 2026. The warning follows the movement of a monsoon trough across the Northern, Central, and Northeastern regions of Thailand, coupled with an intensifying southwest monsoon.

These meteorological conditions are expected to result in increased rainfall and heavy downpours across several parts of the country. The ONWR has specifically advised residents and travelers to remain vigilant regarding the risks of flash floods, forest runoff, and riverbank overflows during this five-day period.

For those currently in or planning to travel to these regions, it is important to monitor local weather updates and follow instructions from provincial authorities. While the ONWR has identified the high-risk timeframe, the specific severity and exact locations most impacted by the rainfall remain subject to ongoing meteorological monitoring. Travelers should exercise caution when visiting areas prone to sudden water level changes, such as mountainous regions or low-lying river basins. Further details regarding specific provinces at the highest risk may be updated by local disaster prevention and mitigation offices as the situation develops.