Mahina, French Polynesia offers 7 beaches perfect for sunbathing, surfing, swimming, and more. Mahina is known for the historic Point Venus Lighthouse and the black sand beaches of Matavai Bay. The best time to travel to Mahina, French Polynesia, is from May to October, with average air temperatures around 77°F (25°C) and water temperatures near 79°F (26°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!