Bayfield, United States offers 11 beaches perfect for sunbathing, surfing, swimming, and more. Bayfield, Wisconsin, United States, is known for the Apostle Islands National Lakeshore. The best time to travel to Bayfield, United States, is in July when the average air temperature is around 70°F (21°C) and the water temperature 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!