Weather can make or break a road trip, so here's some data about year-round temperatures in Sittwe to help you plan yours: The hottest months are usually April and May, with an average temperature of 28°C, while the coldest months are January and February, with an average of 24°C. The rainiest months in Sittwe are July, June, August and September, with each month seeing an average of 814 mm of rainfall.