Mandala, Indonesia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Mandala, Papua, Indonesia, is known for the Lorentz National Park, a UNESCO World Heritage Site. The best time to travel to Mandala, Indonesia, is from May to September, with average air temperatures around 27°C (81°F) and water temperatures near 28°C (82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!