Monthly Weather Summary

                      In September 2025, In September 2024, Thailand experienced abundant rainfall almost the entire month due to the influence of the monsoon trough that lay across upper Thailand for most of the month, combined with the prevailing moderate to rather active southwest monsoon over the Andaman Sea, Thailand and the Gulf of Thailand. Furthermore, the effect of the typhoon “TAPAH (2516)” made landfall over Guangdong, China in early month. During the end of the month, typhoon “RAGASA (2518)” which dissipated over Vietnam associated with the Typhoon “BUALOI (2520)” made landfall in Quang Binh, upper Vietnam and moved into dissipation in Laos. These conditions brought plentiful rainfall in most areas of Thailand and flooding in several areas. The average total rainfall overall Thailand in this month was 9% higher than normal. Monthly rainfall was above normal in most parts of Thailand i.e. northern part 31.3 mm (14%), northeastern part 51.4 mm (20%), central part 28.6 mm (11%), and eastern part 43.9 mm (12%) while below normal was found in southern part (east coast) 15.5 mm (11%) and southern part (west coast) 37.6 mm (9%). The average temperature of Thailand was 0.3 degree Celsius warmer than normal. For more details are as follows.