Port Austin, United States offers 8 beaches perfect for sunbathing, surfing, swimming, and more. Port Austin is known for Turnip Rock, a unique geological formation in Lake Huron. The best time to travel to Port Austin, United States, is during the summer months of June to August, when the average air temperature is around 70-80°F and the water temperature is approximately 60-70°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!