Fenwick Island, United States offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Fenwick Island is known for Fenwick Island State Park and the Fenwick Island Lighthouse. The best time to travel to Fenwick Island is from June to August, with average air temperatures around 75-85°F and water temperatures ranging from 70-75°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!