Putnam Valley, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Putnam Valley, New York, United States, is known for the Clarence Fahnestock State Park and the Hudson Highlands. The best time to travel to Putnam Valley, United States, is during late spring to early fall (May to September) when the average air temperature ranges from 60°F to 80°F and water temperatures in nearby lakes are around 65°F to 75°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!