Ellisburg, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Ellisburg, New York, United States, is known for its proximity to the scenic Lake Ontario and the historic Southwick Beach State Park. The best time to travel to 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!