Thailand Meteorological Department Issues Heavy Rain Warning for 41 Provinces

On September 14, 2026, the Thai Meteorological Department (TMD) issued a weather advisory warning of heavy to very heavy rainfall affecting 41 provinces across Thailand. According to Khaosod Online, the forecast indicates that 70% of these areas will experience significant precipitation, raising concerns regarding flash floods, forest runoff, and landslides, particularly in low-lying areas and regions near mountain slopes.

The adverse weather is attributed to a monsoon trough extending across the upper South, the East, and the lower Northeast, connecting to a strong low-pressure cell over central Vietnam. Simultaneously, a moderate southwest monsoon is affecting the Andaman Sea and the Gulf of Thailand. Bangkok and its surrounding metropolitan areas are included in the warning.

For travelers and residents, the TMD advises extreme caution. Those in flood-prone areas should avoid routes known for recurring inundation. Maritime activities are also impacted; the upper Andaman Sea is expected to see waves reaching approximately 2 meters, with higher swells in thunderstorm areas. Mariners are urged to navigate with caution and avoid sailing through storm-affected zones.

While the TMD has provided this 24-hour forecast, the duration of these conditions remains subject to change based on the movement of the low-pressure system. Residents are encouraged to monitor official updates for further developments regarding potential evacuation or emergency protocols in high-risk zones.