Manorhaven, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Manorhaven, New York, United States, is known for Manorhaven Beach Park and its scenic views of Manhasset Bay. The best time to travel to Manorhaven, 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 the water temperature is around 60°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!