Brimley, United States offers 7 beaches perfect for sunbathing, surfing, swimming, and more. Brimley, Michigan, United States, is known for the Bay Mills Resort & Casinos and the scenic Brimley State Park. The best time to travel to Brimley, United States, is in July when the average air temperature is around 70°F (21°C) and the water temperature in Lake Superior is approximately 55°F (13°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!