Sumberoto, Indonesia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Sumberoto, East Java, Indonesia, is known for its proximity to the Bromo Tengger Semeru National Park. The best time to travel to Sumberoto, Indonesia, is during the dry season 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!