Gibraltar, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Gibraltar, Wisconsin, United States, is known for Peninsula State Park and the historic Ephraim Village. The best time to travel to Gibraltar, United States, is during the summer months of June to August, with average air temperatures around 70-80°F and water temperatures around 60-70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!