If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Mengla County: The hottest months are usually April and May, with an average temperature of 24°C, while the coldest months are January and December, with an average of 17°C. The rainiest months in Mengla County are August, July, June and September, with each month seeing an average of 288 mm of rainfall.