Clear Lake, United States offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Clear Lake, Iowa, United States, is known for the Surf Ballroom, a historic music venue famous for its connection to Buddy Holly. The best time to travel to Clear Lake, United States, is during the summer months of June to August, when the average air temperature is around 85°F (29°C) and the water temperature is approximately 75°F (24°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!