Copan, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Copan, Oklahoma, United States, is known for the Copan Lake and the nearby Copan Wildlife Management Area, which offer opportunities for outdoor recreation and wildlife observation. The best time to travel to Copan, United States, is in late spring when the average air temperature is around 70°F (21°C) and water temperature is not applicable as it is a landlocked area. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!