Monthly Weather Summary

           In October 2025, Thailand experienced abundant rainfall almost the whole month due to the southwest monsoon prevailing over the Andaman Sea, Thailand, and the Gulf of Thailand in the first half of the month. Furthermore, the effect of the typhoon “MATMO (2521) which dissipated over upper Vietnam at the beginning of the month, the monsoon trough laying across the upper Thailand during October 8-14 coupled with the easterly wave moved to cover Thailand on Octobers 14-15. At the end of the month, this monsoon trough moved southward to lie across the southern Thailand accompanied with the active low-pressure cell covered the lower coastal areas of Vietnam with the confluence of the easterly and southeasterly winds prevailed over northern part. Moreover, the high-pressure area form China extended its ridge to cover upper Thailand accompanied with the transition of monsoon system from the easterly wind and northeast monsoon over Thailand during last month. It caused cool weather in several areas in northern and northeastern parts. Monthly rainfall was below normal in most parts of Thailand i.e. northern part 7.8 mm (7%), northeastern part 19.6 mm (19%), central part 26.4 mm (14%), eastern part 64.6 mm (30%) and southern part (east coast) 33.5 mm (13%) while above normal rainfall in southern part (west coast) 81.0 mm (22%). The average total rainfall over Thailand in October was 9% below normal. Overall, the average temperature in Thailand was 0.5°C higher than normal. For more details are as follows.