Weather is probably a major factor when you plan your trip to Muang Xai, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually April and March with an average temp of 76°F, while the coldest months are January and December with an average of 65°F. The rainiest months in Muang Xai are August, July, September, and June, with each month seeing an average of 13 inches of rainfall.