Planning for the weather is a good way to make your trip to Pyin Oo Lwin relaxing and enjoyable, especially when you’re splurging. 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.