Travel Itinerary - Mackinac Island, MI - Mackinac Island Tourism Bureau
https://www.mackinacisland.org/travel-itinerary/
WEBSummers on Mackinac Island are moderate with cool mornings and warmer afternoons with some humidity. The warm season runs from June to September with the average daily temperature just over 65° F. Average temperatures for the Spring/Summer months are May (50˚ F), June (64˚ F), July (70˚ F), August (71˚ F), and September (63˚ F).
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