General
Thailand Meteorological Department Issues Heavy Rain and High Wave Alert
The Thai Meteorological Department has warned of heavy rainfall across multiple regions and hazardous sea conditions due to a strong southwest monsoon.
On August 21, 2026, the Thai Meteorological Department issued a weather alert regarding a monsoon trough extending across the upper North and Northeast regions, coupled with an active low-pressure cell near Hainan, China. This weather pattern is expected to bring isolated heavy rains throughout Thailand, with the potential for very heavy rainfall in the North, Northeast, Central, and Eastern regions.
For those living in or traveling to coastal areas, the situation is particularly significant. The department reports that a rather strong southwest monsoon is currently prevailing over the Andaman Sea and the Gulf of Thailand. This is causing waves in the upper Andaman Sea and the upper Gulf to reach heights of 2 to 3 meters, with conditions exceeding 3 meters during thundershowers. In the lower Andaman Sea, wave heights are expected to be around 2 meters, rising above that mark during storms.
These conditions may impact maritime travel and coastal activities. Residents and visitors are advised to monitor local weather updates closely. While the forecast indicates the current trajectory of the monsoon and low-pressure system, the exact duration of these severe conditions remains to be confirmed by ongoing meteorological observations. Travelers should exercise caution near the coast and follow guidance from local authorities.