Dune Acres, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Dune Acres is known for its proximity to the Indiana Dunes National Park. The best time to travel to Dune Acres, United States, is during late spring to early fall (May to September) when the average air temperature ranges from 60°F to 80°F and the water temperature in Lake Michigan is around 50°F to 70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!