If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Thanlyin: The hottest months are usually April and March with an average temp of 86°F, while the coldest months are January and February with an average of 80°F. The rainiest months in Thanlyin are July, August, June, and September, with each month seeing an average of 21 inches of rainfall.