Bangkok: The Meteorological Department has issued a warning of heavy rainfall in several regions of Thailand, with Bangkok and its surrounding areas, as well as the Eastern region, expected to experience particularly severe weather conditions.
According to Thai News Agency, the department's 24-hour weather forecast indicates isolated heavy rain, with very heavy rainfall anticipated in areas such as Buriram, Surin, Sisaket, Prachinburi, Chanthaburi, and Trat provinces. Residents in these regions are urged to remain vigilant due to potential flash floods and mudslides, especially near hillsides, waterways, and low-lying areas. This weather pattern is attributed to the monsoon trough traversing the Central, Eastern, and lower Northeastern areas, in conjunction with a strong low-pressure system over the South China Sea and a strengthened southwest monsoon affecting the Andaman Sea, Thailand, and the Gulf of Thailand.
Maritime conditions are also expected to be challenging, with waves reaching about 2 meters in the upper Andaman Sea and upper Gulf of Thailand. In the lower Andaman Sea, wave heights are anticipated to be between 1-2 meters, with increased heights in areas experiencing thunderstorms. Mariners are advised to exercise caution and avoid navigating through storm-affected zones.
In addition, Tropical Storm "Mitag," currently positioned in the upper South China Sea, is projected to make landfall around September 19, 2025. Although the storm is not expected to enter Thailand, travelers to the affected areas should verify weather conditions prior to their departure.
The regional weather forecast for September 19, 2025, predicts thunderstorms across 70% of Bangkok and its surrounding areas, with heavy to very heavy rain expected in some locations. Temperatures are forecasted to range between 24-25 degrees Celsius at the minimum and 32-34 degrees Celsius at the maximum, with southwesterly winds blowing at 10-15 km/h. Similar weather conditions are anticipated in the Northern, Northeastern, Central, Eastern, and Southern regions, with variations in rainfall intensity and wind speed.