Nanjemoy, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Nanjemoy, Maryland, United States, is known for the Nanjemoy Creek Environmental Education Center and the historic Mallows Bay, which is home to the largest shipwreck fleet in the Western Hemisphere. The best time to travel to Nanjemoy, United States, is in late spring (May), when the average air temperature is around 70°F (21°C) and the water temperature in nearby bodies is approximately 65°F (18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!