Junction City, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Junction City, Wisconsin, United States, is known for its proximity to the scenic Wisconsin River and outdoor recreational activities. The best time to travel to Junction City, United States, is in late spring (May), when the average air temperature is around 70°F (21°C) and water temperature is approximately 60°F (16°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!