Fond du Lac, United States offers 1 beach perfect for sunbathing, surfing, swimming, and more. Fond du Lac, Wisconsin, United States, is known for the Fond du Lac County Fair and Lakeside Park. The best time to travel to Fond du Lac, United States, is in late spring or early fall when the average air temperature is around 60-70°F and the water temperature in nearby lakes is approximately 60°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!