Knox, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Knox, Indiana, United States, is known for the Bass Lake, a popular destination for fishing and recreational activities. The best time to travel to Knox, United States, is in late spring (May), when the average air temperature is around 65°F (18°C) and the water temperature is approximately 55°F (13°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!