If you’re looking forward to lots of outings with your partner, check out these details about year-round temperatures in Aluthgama: The hottest months are usually March and April with an average temp of 82°F, while the coldest months are January and February with an average of 80°F. The rainiest months in Aluthgama are May, June, October, and November, with each month seeing an average of 16 inches of rainfall.