Planning for the weather is an important factor for making your trip to Mu Cang Chai a success, especially when you’re splurging. The hottest months are usually May and June with an average temp of 71°F, while the coldest months are January and December with an average of 57°F. The rainiest months in Mu Cang Chai are August, July, June, and September, with each month seeing an average of 13 inches of rainfall.