Planning for the weather is a good way to make your trip to Surat Thani relaxing and enjoyable, especially when you’re splurging. The hottest months are usually April and March, with an average temperature of 28°C, while the coldest months are January and February, with an average of 26°C. The rainiest months in Surat Thani are November, October, May and September, with each month seeing an average of 276 mm of rainfall.