The Thai Meteorological Department (TMD) has warned of persistent heavy rain across eastern and southern Thailand from October 22 to 25, 2026. The alert highlights risks of flash floods, landslides, and high waves in the Andaman Sea and Gulf of Thailand.
Scope of the weather warning
The Thai Meteorological Department (TMD) issued Warning No. 12 (271/2569) on October 22, 2026. It covers the period from October 22 to 25. The alert specifically targets eastern and southern regions, where persistent rain could trigger flash floods and rapid runoff. Residents in low-lying areas and near foothills should exercise caution due to strong gusts and accumulated rainfall.
Bangkok and the central region also face thundershowers with strong winds during this period. The lower North and lower Northeast are included in the forecast for unsettled weather. The TMD notes that a monsoon trough over southern Thailand and the southwest monsoon over the lower Andaman Sea drive this weather pattern.
Marine hazards and official response
Mariners should proceed with extreme caution. Waves in the Andaman Sea and the Gulf of Thailand forecast to exceed three metres in areas affected by thundershowers. The TMD advises avoiding navigation through these storm cells to prevent accidents.
This warning follows an earlier alert from the Department of Disaster Prevention and Mitigation (DDPM) on October 18. That notice placed 35 provinces and Bangkok on high alert, instructing local authorities to prepare emergency response teams. The current situation is part of a broader transition from the rainy season, which has already caused significant damage across the country.
Context of recent flooding
Thailand has experienced widespread flooding in recent weeks. According to reports, floods killed 71 people since September 16 and affected approximately 908,000 households across 51 provinces as of October 12. The TMD will issue its next advisory at 5 am on October 23. Citizens should monitor official channels for the latest updates on weather conditions and safety measures.
