Fire Island, United States offers 7 beaches perfect for sunbathing, surfing, swimming, and more. Fire Island is known for its Fire Island National Seashore, Sunken Forest, and the Fire Island Lighthouse. The best time to travel to Fire Island is from late June to early September, 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!