Center Harbor, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Center Harbor is known for Lake Winnipesaukee and the Squam Lakes Natural Science Center. The best time to travel to Center Harbor, United States, is in July when the average air temperature is around 70°F (21°C) and the water temperature is approximately 68°F (20°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!