Hamula, Tonga offers 1 beach perfect for sunbathing, surfing, swimming, and more. Tongatapu is known for the Ha'amonga 'a Maui Trilithon and the Royal Palace of Tonga. The best time to travel to Ha'apai, Tonga, is from May to October, with average air temperatures around 25°C (77°F) and water temperatures near 26°C (79°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!