Black River, United States offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Black River, Michigan, United States, is known for the Black River Harbor, a picturesque spot on Lake Superior with a historic suspension bridge and scenic waterfalls. The best time to travel to Black River, 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!