Visiting local bars in Ko Surin Tai is more fun in good weather. These rainfall averages and temperatures can help you choose the best time for bar hopping. The hottest months are usually March and April with an average temp of 81°F, while the coldest months are January and February with an average of 79°F. The rainiest months in Ko Surin Tai are September, October, July, and August, with each month seeing an average of 15 inches of rainfall.