Bangkok: Rain continues to fall, putting many areas at risk of flooding again from accumulated water. The Meteorological Department forecasts that Thailand will continue to experience continuous rainfall during this period, especially in areas near the monsoon trough. Areas that have already experienced accumulated rainfall and flooding may experience further flooding.
According to Thai News Agency, Mr. Somkuan Tonjan, Director of the Meteorological Department's Weather Forecasting Division, revealed that the monsoon trough continues to pass through the northern and northeastern regions, coupled with the moderate southwest monsoon continuing to prevail over Thailand. This will result in widespread rainfall in many areas of Thailand from September 12-21, 2025, particularly in areas near the monsoon trough and the lower southern region. This could lead to further flooding due to accumulated rainfall. Special vigilance is required in areas where flooding is still occurring.
For the weather conditions from September 12-15, 2025, heavy rain will occur along the monsoon trough passing through the northern and northeastern regions, coupled with the southwest monsoon prevailing over the Andaman Sea, Thailand, and the Gulf of Thailand. This will cause continuous rain in some periods, with some heavy rain in some areas. Both coasts of the southern region, particularly the lower southern region, will experience increased rain, with the possibility of heavy rain in some areas. Boat operators and fishermen are advised to exercise caution while sailing, especially in areas with thunderstorms.
From September 16-21, 2025, Thailand will continue to experience heavy rainfall in many areas. The rainfall will alternate between light and heavy, with small to moderate amounts. The monsoon trough may return to pass through the lower northern, northeastern, and central regions. Furthermore, it is expected that a low-pressure area will cover the northeastern region, which will result in heavy rainfall in some areas of the lower northeastern, eastern, and central regions, including Bangkok and its vicinity.
Heavy and accumulated rainfall may cause flash floods and mudslides, especially in low-lying areas and areas with remaining floodwaters from previous periods, as well as flooding in urban areas.
At this time, there are no signs of a tropical storm forming, but it is expected that a strong low-pressure area will cover the South China Sea and will likely move towards the coast of Vietnam in the next period. Further monitoring of its impact on Thailand's weather conditions is necessary. The public is asked to closely follow announcements from the Meteorological Department.