If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Wenchang: The hottest months are usually June and July with an average temp of 84°F, while the coldest months are January and February with an average of 69°F. The rainiest months in Wenchang are August, October, July, and September, with each month seeing an average of 10 inches of rainfall.