Weather will likely play an important role when you plan your trip to Mandalay, 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 87°F, while the coldest months are January and December with an average of 74°F. The rainiest months in Mandalay are August, October, September, and July, with each month seeing an average of 8 inches of rainfall.