Town Of Ellisburg, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Town Of Ellisburg, New York, United States, is known for its proximity to Southwick Beach State Park and Lake Ontario. The best time to travel to the Town of Ellisburg, United States, is during the summer months of June to August, when the average air temperature is around 70-80°F and the water temperature in nearby Lake Ontario is approximately 65-75°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!