Oak Island, United States offers 9 beaches perfect for sunbathing, surfing, swimming, and more. Oak Island is known for the Oak Island Lighthouse and its beautiful beaches. The best time to travel to Oak Island, United States, is from May to September, with average air temperatures ranging from 70°F to 85°F and water temperatures from 75°F to 80°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!