Vienna, United States offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Vienna, Illinois, United States, is known for the Tunnel Hill State Trail and the nearby Shawnee National Forest. The best time to travel to Vienna, United States, is in late spring (May to June) when the average air temperature is around 70°F (21°C) and water temperature in nearby lakes is approximately 65°F (18°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!