Sumbermanjing, Indonesia offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Sumbermanjing is known for its stunning beaches like Sendang Biru and the nearby Sempu Island. The best time to travel to Sumbermanjing, 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!