Visiting local bars in Haad Tian is more fun in good weather. These temperatures and rainfall averages can help you decide the best time for bar hopping. The hottest months are usually May and June with an average temp of 84°F, while the coldest months are January and February with an average of 81°F. The rainiest months in Haad Tian are November, October, September, and December, with each month seeing an average of 11 inches of rainfall.