Spring City, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Spring City is known for Watts Bar Lake and the historic Tennessee Valley Theatre. The best time to travel to Spring City, United States, is in late spring when the average air temperature is around 70°F (21°C) and the water temperature is approximately 65°F (18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!