Calvert Beach, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Calvert Beach, Maryland, United States, is known for its proximity to the Calvert Cliffs State Park and the Chesapeake Bay. The best time to travel to Calvert Beach, United States, is during late spring to early fall (May to September) when the average air temperature ranges from 70-85°F and the water temperature is around 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!