Rocky River, United States offers 3 beaches perfect for sunbathing, surfing, swimming, and more. Rocky River is known for the Cleveland Metroparks, specifically the Rocky River Reservation. The best time to travel to Rocky River, United States, is during the summer months of June to August, when the average air temperature is around 75°F (24°C) and the water temperature in Lake Erie is approximately 70°F (21°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!