Twin Lakes, United States offers 7 beaches perfect for sunbathing, surfing, swimming, and more. Twin Lakes, Wisconsin, United States, is known for the Aquanut Water Shows and the annual Country Thunder music festival. The best time to travel to Twin Lakes, United States, is during the summer months of June to August, when the average air temperature is around 70-80°F and the water temperature is approximately 65-70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!