Planning for the weather is a good way to make your trip to Thong Chai relaxing and enjoyable, especially when you’re splurging. The hottest months are usually April and May, 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 Thong Chai are September, October, July and May, with each month seeing an average of 252 mm of rainfall.