Sackets Harbor, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Sackets Harbor is known for the Sackets Harbor Battlefield State Historic Site and its role in the War of 1812. The best time to travel to Sackets Harbor, 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 is approximately 65-75°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!