Hillsdale, United States offers 2 beaches perfect for sunbathing, surfing, swimming, and more. Hillsdale, Michigan, United States, is known for Hillsdale College, a prominent liberal arts college. The best time to travel to Hillsdale, United States, is in late spring (May to June) when the average air temperature is around 65-75°F, and water temperatures in nearby lakes are typically 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!