Constantia, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Constantia, New York, United States, is known for its proximity to Oneida Lake, a popular destination for fishing and boating enthusiasts. The best time to travel to Constantia, United States, is in late spring (May to June) when the average air temperature is around 60-70°F and the water temperature in nearby lakes is approximately 50-60°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!