Eueiki Island, Tonga offers 1 beach perfect for sunbathing, surfing, swimming, and more. Eueiki Island, Vava'u, Tonga, is known for its proximity to the stunning Swallows Cave and the vibrant coral reefs ideal for snorkeling and diving. The best time to travel to Eueiki Island, Tonga, is from May to October, with average air temperatures around 75-85°F (24-29°C) and water temperatures approximately 77-82°F (25-28°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!