Planning for the weather is an important factor for making your trip to Thahtay Kyun a success, especially when you're splurging. The hottest months are usually March and April with an average temp of 82°F, while the coldest months are January and February with an average of 79°F. The rainiest months in Thahtay Kyun are September, July, October, and August, with each month seeing an average of 16 inches of rainfall.