Binasi, Indonesia offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Binasi, Sumatera Utara, Indonesia, is known for its proximity to Lake Toba, the largest volcanic lake in the world. The best time to travel to Binasi, 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!