Bangkok: The Meteorological Department has issued a warning that Thailand is expected to experience increased rainfall, with heavy to very heavy rain anticipated in certain areas of the eastern region and along the western coast of the southern region. This warning specifically highlights the provinces of Ranong, Phang Nga, Chanthaburi, and Trat, urging residents to exercise caution.
According to Thai News Agency, the forecast predicts increased rainfall over the next 24 hours, with isolated heavy to very heavy rain expected in the eastern and western southern regions, particularly in the provinces mentioned above. Residents in these areas are advised to be vigilant about potential dangers associated with heavy and accumulated rainfall, which could lead to flash floods and landslides, especially in hillside areas near waterways and lowlands. This situation arises from the intensification of the southwest monsoon prevailing over the Andaman Sea, Thailand, and the Gulf of Thailand, coupled with a monsoon trough extending across lower central, eastern, and lower northeastern regions, entering a strong low-pressure area over the South China Sea.
In the upper Andaman Sea, waves are expected to be approximately 2 meters high, while in the lower Andaman Sea and the upper Gulf of Thailand, waves will be 1-2 meters high. In areas experiencing thunderstorms, waves may exceed 2 meters. Mariners are advised to exercise caution and avoid sailing in areas where thunderstorms are present.
Additionally, there is a depression over the eastern part of the Philippines that is likely to intensify into a tropical storm, with expectations to make landfall over southern China between September 19-20, 2025.
The regional weather forecast for September 17, 2025, provides detailed predictions for various parts of Thailand, indicating thunderstorms and varying levels of rainfall across Bangkok, the Northern, Northeastern, Central, Eastern, and Southern regions. Each region is expected to experience different weather conditions, with specific attention given to areas likely to face heavy rainfall. Residents and local authorities are encouraged to stay updated with weather advisories and prepare for potential adverse weather impacts.