Planning for the weather is a good way to make your trip to Chaiyo relaxing and enjoyable, especially when you're splurging. The hottest months are usually April and March, with an average temperature of 31°C, while the coldest months are December and January, with an average of 26°C. The rainiest months in Chaiyo are September, August, October and July, with each month seeing an average of 223 mm of rainfall.