Frankfort, United States offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Frankfort, Michigan, United States, is known for its scenic Betsie Bay, the historic Point Betsie Lighthouse, and the Sleeping Bear Dunes National Lakeshore nearby. The best time to travel to Frankfort, United States, is in late spring (May to June) when the average air temperature is around 70°F (21°C) and water temperature is approximately 60°F (16°C). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!