Wilmette, United States offers 6 beaches perfect for sunbathing, surfing, swimming, and more. Wilmette is known for the Baha'i House of Worship. The best time to travel to Wilmette, United States, is during late spring to early fall (May to September) when the average air temperature ranges from 60°F to 80°F and the water temperature in Lake Michigan is around 50°F to 70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!