Locust Valley, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Locust Valley, New York, United States, is known for the exclusive Piping Rock Club and the historic Locust Valley Cemetery. The best time to travel to Locust Valley, United States, is in late spring (May to early June) when the average air temperature is around 65-75°F and the water temperature is approximately 55-65°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!