Kemujan, Indonesia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Kemujan, Central Java, Indonesia, is known for Karimunjawa National Park. The best time to travel to Kemujan, Indonesia, is from May to September, with average air temperatures around 28°C (82°F) and water temperatures near 29°C (84°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!