Boyne City, United States offers 5 beaches perfect for sunbathing, surfing, swimming, and more. Boyne City is known for Boyne Mountain Resort and Lake Charlevoix. The best time to travel to Boyne City, 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 in Lake Charlevoix is approximately 65-75°F. Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!