Taking into account the local weather in Mahina is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually March and February with an average temp of 80°F, while the coldest months are August and September with an average of 76°F. The rainiest months in Mahina are January, February, December, and March, with each month seeing an average of 13 inches of rainfall.