Gunungsitoli, Indonesia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Gunungsitoli is known for Nias Heritage Museum and the traditional Nias houses. The best time to travel to Gunungsitoli, Indonesia, is from May to September, with average air temperatures around 27°C (81°F) and water temperatures approximately 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!