Gary, United States offers 10 beaches perfect for sunbathing, surfing, swimming, and more. Gary, South Dakota, United States, is not particularly known for travel and beach tourism. The best time to travel to Gary, United States, is in late spring (May to June) when the average air temperature is around 65-75°F (18-24°C) and the water temperature in Lake Michigan is approximately 50-60°F (10-16°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!