Safety
ONWR Issues Heavy Rainfall Warning for 23 Provinces
The Office of the National Water Resources (ONWR) has issued an alert for heavy to very heavy rainfall across 23 provinces from September 11 to 13, 2026.
According to a report by Matichon Online, the Office of the National Water Resources (ONWR) has issued a formal warning regarding severe weather conditions expected across Thailand. From September 11 to 13, 2026, 23 provinces are forecasted to experience heavy to very heavy rainfall.
For residents and travelers, this weather pattern poses a significant risk of flash floods and forest runoff. Authorities are urging those in affected areas to remain vigilant and monitor local weather updates closely. These conditions may lead to sudden disruptions in transportation, particularly in mountainous or low-lying regions prone to water accumulation.
While the ONWR has identified the timeframe and the general scope of the affected provinces, specific localized impacts remain to be confirmed. Travelers planning trips to these regions during this period should check with local authorities or accommodation providers regarding potential travel delays or safety precautions. It is advised to avoid areas known for rapid water level rises and to follow all guidance provided by provincial disaster mitigation offices. As of now, the full extent of the potential flooding remains subject to the actual volume of rainfall recorded over the three-day period.
