Weather is probably a major factor when you plan your trip to Dali, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually May and June, with an average temperature of 19°C, while the coldest months are January and December, with an average of 9°C. The rainiest months in Dali are August, July, September and June, with each month seeing an average of 188 mm of rainfall.