Rockville, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Rockville is known for the Parke County Covered Bridge Festival. The best time to travel to Rockville, United States, is in late spring (May), when the average air temperature is around 70°F (21°C) and water temperature in nearby bodies is approximately 60°F (16°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!