Twin Falls, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Twin Falls, Idaho, United States, is known for the stunning Shoshone Falls, often referred to as the "Niagara of the West." The best time to travel to Twin Falls, United States, is from June to September, with average air temperatures ranging from 60°F to 85°F and water temperatures in local rivers and lakes around 60°F to 70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!