If you're looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Dali: 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.