Monthly Weather Summary

            In March 2025, the heat low-pressure cell primarily covered upper Thailand at the beginning and the end of month, accompanied by the prevailing of the southerly and southeasterly winds. These resulted in periodically hot weather across most areas of the northern, northeastern, central parts as well as upper portion of the eastern part, with very hot in some areas. In March 2025, the average temperature was above normal in most parts, except for below normal in the northeastern part. The average monthly temperature for the whole country was 0.3°C higher than normal. However, the extension of the ridge from high-pressure area in China to cover northeastern Thailand and the South China Sea and later dominated upper Thailand, the weather became cooler in that area. These induced easterly and southeasterly winds to bring moisture from the South China Sea and the Gulf of Thailand into upper Thailand, in addition with the confluence of the southwesterly and southeasterly winds over upper Thailand on March 12 and 13, resulted in unusual rain, with thunderstorm, and gusty wind in many areas and hail in some places. In the southern part, the easterly and southeasterly winds that dominated the the Gulf of Thailand, southern part and the Andaman Sea were mostly weak. These resulted in less rainfall and hot weather, especially along the west coast. However, due to the strengthened of the easterly wind for the period of March 7-11 and March 18-22, there was an increase in rainfall reported in southern part at that time. Monthly rainfall was below normal in almost parts i.e. northern part 25.4 mm (7%), central part 2.6 mm (49%), southern part (east coast) 48.7 mm (56%) and southern part (west coast) 43.5 mm (42%), except for northeastern and eastern parts that received above normal 5.3 mm (12%) and 7.2 mm (11%), respectively. The average total rainfall over Thailand in this month was lower than normal 18.9 mm (34%).