Sitiarjo, Indonesia offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Sitiarjo is known for its proximity to the Sempu Island Nature Reserve and Sendang Biru Beach. The best time to travel to Sitiarjo, 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!