Glen Arbor, United States offers 10 beaches perfect for sunbathing, surfing, swimming, and more. Glen Arbor is known for the Sleeping Bear Dunes National Lakeshore. The best time to travel to Glen Arbor is in late summer, around August, when the average air temperature is about 70°F (21°C) and the water temperature in Lake Michigan 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!