If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Caotun: The hottest months are usually July and August with an average temp of 79°F, while the coldest months are January and February with an average of 65°F. The rainiest months in Caotun are August, June, July, and May, with each month seeing an average of 15 inches of rainfall.