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 temperature of 21°C, while the coldest months are January and December, with an average of 14°C. The rainiest months in Mu Cang Chai are August, July, June and September, with each month seeing an average of 338 mm of rainfall.