Planning for the weather is an important factor for making your trip to Chengjiang County a success, especially when you're splurging. The hottest months are usually May and June, with an average temperature of 20°C, while the coldest months are January and December, with an average of 10°C. The rainiest months in Chengjiang County are June, July, August and September, with each month seeing an average of 239 mm of rainfall.