ONWR Issues Flash Flood Warning for Multiple Regions in Thailand

The Office of the National Water Resources (ONWR) has released Announcement No. 5/2026, alerting the public to an increased risk of severe weather conditions across Thailand between September 22 and September 26, 2026. According to the report from Prachachat Business, the country is expected to experience intensified rainfall, with some areas facing heavy to very heavy downpours.

These weather conditions pose a significant risk of flash floods, water runoff, and mudslides in various regions. Furthermore, authorities are closely monitoring the water levels in the Chao Phraya River basin, as runoff from the upper regions is expected to impact five provinces downstream.

For residents and travelers, this warning suggests a need for heightened vigilance, particularly in low-lying areas or regions prone to landslides. It is advisable to monitor local weather updates and follow instructions from provincial authorities if traveling during this period. While the ONWR has identified the high-risk timeframe, the specific impact on infrastructure and transportation routes remains to be confirmed as the situation develops. Travelers should check with local transport providers regarding potential delays or route changes caused by water accumulation on roads or rail lines.