Oconto, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Oconto, Wisconsin, United States, is known for Copper Culture State Park and the Beyer Home Museum. The best time to travel to Oconto, United States, is in July when the average air temperature is around 70°F (21°C) and the water temperature is approximately 68°F (20°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!