Manns Harbor, United States offers 4 beaches perfect for sunbathing, surfing, swimming, and more. Manns Harbor is known for its proximity to the Outer Banks and the Alligator River National Wildlife Refuge. The best time to travel to Manns Harbor, United States, is in late spring (May), when the average air temperature is around 70°F (21°C) and the water temperature 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!