Weather will likely play an important role when you plan your trip to Pyin Oo Lwin, 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 64°F. The rainiest months in Pyin Oo Lwin are August, July, June, and September, with each month seeing an average of 18 inches of rainfall.