Bangkok: The Meteorological Department has issued a warning for heavy to very heavy rain in the southern region of Thailand, expected to persist until November 25th. Strong winds and elevated sea levels are complicating flood drainage efforts, as the region grapples with the effects of monsoon conditions and a low-pressure system, intensified by the La Ni±a climate phenomenon. These factors have resulted in extreme rainfall over the past five days.
According to Thai News Agency, Announcement No. 19 (358/2025) from the Meteorological Department highlights that the provinces of Nakhon Si Thammarat, Phatthalung, Songkhla, Pattani, Yala, Narathiwat, Trang, and Satun are particularly at risk. The department advises that small boats remain ashore due to strong waves in the Gulf of Thailand and the Andaman Sea, which could reach heights of 2-3 meters and exceed 3 meters in areas experiencing thunderstorms.
Mr. Surapong Sarapa, Director of the Weather Forecasting Division, emphasized that the continuous rainfall observed over the past week is classified as “extreme weather.” This condition is driven by several factors, including a strong northeast monsoon, a low-pressure area over the lower Andaman Sea and Malaysia, and the La Ni±a phenomenon, which increases atmospheric humidity. Climate change has also altered rainfall patterns, resulting in concentrated downpours in short time frames.
Significant rainfall statistics over the past five days include Nakhon Si Thammarat receiving 100-200 mm within 24 hours on November 19-20, and more than 600 mm recorded in Narathiwat on November 22. In Hat Yai District, accumulated rainfall over the past three days has approached 600 mm, with slow drainage attributed to strong sea waves and rising seawater.
Forecasts indicate that the southern region will continue experiencing heavy rainfall, potentially exacerbating flooding conditions, particularly in low-lying areas and foothills near waterways. Residents are urged to remain vigilant for flash floods, mudslides, and high waves, especially from Surat Thani Province and further south.
In upper Thailand, temperatures are expected to rise slightly from November 24th to 25th, with morning fog. The North and Northeast will stay cool to cold, while the Central and Eastern regions, including Bangkok, will experience cool mornings. Mountain and hilltop areas will remain cold to very cold.
The Meteorological Department advises the public to prepare for weather changes and exercise caution when traveling in areas with dense fog. Additionally, there are cautions against fires resulting from dry conditions.