Knoxville, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Knoxville, Tennessee, United States, is known for the Sunsphere, a prominent feature from the 1982 World's Fair. The best time to travel to Knoxville is in the fall, from September to November, when the average air temperature is around 60-70°F and water temperature in nearby lakes is about 65°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!