If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Mangaluru: The hottest months are usually April and March with an average temp of 83°F, while the coldest months are January and December with an average of 80°F. The rainiest months in Mangaluru are July, June, August, and September, with each month seeing an average of 29 inches of rainfall.