Long Sault, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Long Sault is known for the Long Sault Parkway, a series of islands and recreational areas in the St. Lawrence River. The best time to travel to Long Sault, United States, is during the summer months of June to August, when the average air temperature is around 75°F (24°C) and the water temperature is approximately 70°F (21°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!