Thailand Faces Heavy Rain and Flood Risks Through October 25

Key summary

The Thai Meteorological Department (TMD) issued a warning at 5am on Wednesday, October 21, 2026, for heavy to very heavy rain expected across parts of Thailand until October 25. Persistent downpours in the South and increased rainfall in the lower Northeast, lower Central region including Bangkok, the East, and upper South could trigger flash floods and sudden runoff, particularly on foothill slopes and in low-lying areas. Strong gusts are also forecast. The wet conditions are attributed to a monsoon trough across central southern Thailand and the southwest monsoon over the lower Andaman Sea. A high-pressure system or cold air mass from China is expected to spread over the upper North, upper Northeast, and South China Sea, bringing easterly winds. Waves in the Andaman Sea and Gulf of Thailand are forecast to exceed three metres during this period. Boaters should proceed cautiously and avoid thunderstorms. Residents are advised to plan activities and travel carefully and follow official weather updates available via the TMD website or telephone on 02-399-4012, 02-399-4013, and 1182. The next advisory is scheduled for 5pm Thai time on October 21.