Ossipee, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Ossipee, New Hampshire, United States, is known for Ossipee Lake and the Ossipee Mountains, which offer scenic beauty and outdoor recreational activities. The best time to travel to Ossipee, 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 local lakes 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!