Planning for the weather is a good way to make your trip to Chenggong relaxing and enjoyable, especially when you’re splurging. The hottest months are usually May and June with an average temp of 68°F, while the coldest months are January and December with an average of 51°F. The rainiest months in Chenggong are June, July, August, and September, with each month seeing an average of 9 inches of rainfall.