If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Trat: The hottest months are usually April and March, with an average temperature of 28°C, while the coldest months are January and December, with an average of 26°C. The rainiest months in Trat are September, July, August and June, with each month seeing an average of 423 mm of rainfall.