Planning for the weather is an important factor for making your trip to Pha Chang Noi a success, especially when you're splurging. The hottest months are usually April and March, with an average temperature of 26°C, while the coldest months are January and December, with an average of 22°C. The rainiest months in Pha Chang Noi are August, July, September and June, with each month seeing an average of 313 mm of rainfall.