Mequon, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Mequon is known for the Concordia University Wisconsin and the Mequon Nature Preserve. The best time to travel to Mequon, United States, is in late spring (May to early June) when the average air temperature is around 60-70°F and Lake Michigan's water temperature is approximately 50-60°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!