New Suffolk, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. New Suffolk is known for its historic New Suffolk Schoolhouse and its picturesque views of Peconic Bay. The best time to travel to New Suffolk, United States, is in late spring or early fall when the average air temperature is around 65-75°F and the water temperature is approximately 60-70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!