Planning for the weather is a good way to make your trip to Chiang Dao relaxing and enjoyable, especially when you’re splurging. The hottest months are usually April and March with an average temp of 83°F, while the coldest months are January and December with an average of 73°F. The rainiest months in Chiang Dao are September, August, July, and October, with each month seeing an average of 8 inches of rainfall.