If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Cox’s Bazar: The hottest months are usually April and May with an average temp of 82°F, while the coldest months are January and December with an average of 72°F. The rainiest months in Cox’s Bazar are July, June, August, and September, with each month seeing an average of 23 inches of rainfall.