Thailand Meteorological Department Issues Heavy Rain Forecast for October 18-25

Key summary

On October 18, 2026, the Thailand Meteorological Department forecasted heavy rainfall in the Eastern and Southern regions, with thunderstorms expected across northern Thailand. The department warned of potential flash floods and landslides due to accumulated rain, particularly in low-lying areas and mountainous slopes near waterways. Conditions are driven by a weak high-pressure system over northern Thailand and the South China Sea, combined with a monsoon trough crossing southern Thailand. Continuous heavy rain is expected from October 18-20 in the East and South, followed by increased rainfall in the Northeast, Central region (including Bangkok), Eastern region, and upper South from October 21-25, potentially accompanied by strong winds. Specific daily forecasts for October 18 indicate a 60% chance of thunderstorms in the East, 70% in both coasts of the South, 10% in the North, 20% in the Northeast, and 40% in the Central region, with temperatures ranging from 21°C to 36°C depending on the area. Wave heights exceeding 2 meters are expected in areas with thunderstorms in the Andaman Sea and Gulf of Thailand.