Umamanu, Indonesia offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Umamanu is known for its pristine beaches and vibrant marine life, making it a popular destination for beach tourism. The best time to travel to Umamanu, 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!