Otea, Tonga offers 1 beach perfect for sunbathing, surfing, swimming, and more. Otea, Vava'u, Tonga, is known for its stunning marine life and whale watching opportunities. The best time to travel to Otea, Tonga, is from May to October, when the average air temperature is around 25°C (77°F) and the water temperature is approximately 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!