September in Chiang Mai brings a mix of warmth and rain. The temperature tends to stay between a comfortable 24°C at its lowest and can rise up to a slightly hot 31°C at its peak. This means that while the days can get a bit warm, the nights offer a cooler respite. The wind speed is moderate, averaging around 9 km/h, which adds a pleasant breeze to the overall climate.
Rainfall is quite significant in September, with about 210 mm falling throughout the month. This means that while there are plenty of warm days, there are also quite a few rainy ones. Despite the rain, the sun does manage to peek through the clouds, although not as much as in other months. Overall, the weather in Chiang Mai in September is a blend of warmth, wind, and rain.
