There is a great variety in Chiang Mai seasonal weather from cool, hot to rainy. Rainy season in Chiang Mai makes everything beautiful. The maximum temperature stay over 30° C in this season, evenings can be cool or hot depends if it is raining or not. Bad weather generally comes in 3 to 4 day periods, and alternates with excellent weather. So, some fortunate people can spend most of their time under the sun while others will enjoy rain, rain and more rain... <br /> <br />Chiang Mai weather averages show that rainy season is a bit of a lottery. Rain comes at anytime, day and night and in every form: heavy downpour or small drizzle. The landscape returns to its strikingly beautiful shade of green. Rainfall is generally heaviest in September. It would be better if you bring your stuff; otherwise, you will find plastic ponchos here.
