Mt Sinai, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Mt Sinai, New York, United States, is known for Cedar Beach, a popular destination for its scenic views and recreational activities. The best time to visit Mt. Sinai, United States, is during late spring (May to 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!