Great River, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Great River, New York, United States, is known for the Bayard Cutting Arboretum State Park. The best time to travel to Great River, United States, is in late spring (May), when the average air temperature is around 65°F (18°C) and the water temperature is approximately 55°F (13°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!