Williamson, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Williamson, New York, United States, is known for the Pultneyville Historic District and its annual Apple Blossom Festival. The best time to travel to Williamson, United States, is in late spring (May), when the average air temperature is around 70°F (21°C) and water temperature is approximately 60°F (16°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!