When you travel with your pet, keeping tabs on the weather can help you make the trip more safe and fun for everyone. The hottest months are usually April and March, with an average temperature of 25°C, while the coldest months are January and December, with an average of 18°C. The rainiest months in Pyin Oo Lwin are August, July, June and September, with each month seeing an average of 445 mm of rainfall.