Meredith, United States offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Meredith, New Hampshire, United States, is known for Lake Winnipesaukee and the Winnipesaukee Scenic Railroad. The best time to travel to Meredith, United States, is during the summer months of June to August, when the average air temperature is around 70-80°F and the water temperature in Lake Winnipesaukee is approximately 70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!