Lewes, United States offers 14 beaches perfect for sunbathing, surfing, swimming, and more. Lewes is known for Cape Henlopen State Park and the Zwaanendael Museum. The best time to travel to Lewes, United States, is from late May to early September, with average air temperatures ranging from 70°F to 85°F and water temperatures around 70°F to 75°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!