January is the coldest month on Mackinac Island with freezing temperatures for both average high and average low temperatures. The average high temperature hovers at 25°F (-4°C) while the average low temperature is at 9°F (-13°C).
In February, Mackinac Island sees the least amount of rain annually with about 34 mm of expected rainfall. The average high temperature goes up a few degrees to 27°F (-3°C). In contrast, the average low temperature drops to 8°F (-14°C).
March sees warmer weather on Mackinac Island as the average high and average low temperatures range between 36°F (2°C) and 17°F (-8°C) for the first month of spring.
Mackinanc Island Weather in April: The average high temperatures for April sees a significant increase to 50°F (10°C). Congruently, the average low temperature also makes a steep rise to 30°F (-1°C). Despite the sharp increases, the weather remains quite cold.
In May, the average high temperature and average low temperature is 63°F (17°C) and 40°F (4°C) respectively.
Mackinac Island Weather in June: Summer comes to Mackinac Island in June bringing with it average highs in the 70s. The average low temperatures still get quite chilly but increase ten degrees to 50°F (9°C).
July is the hottest month on record for Mackinac Island with the average high temperatures nearing the 80s at 78°F (25°C). The average low temperature increases to 55°F (13°C).
In August, Mackinac Island’s second warmest month, the average high temperature goes down to 75°F (24°C). The average low temperature drops by one degree to 54°F (12°C).
Mackinac Island Weather in September: Mackinac Island gets a lot of rain in September with an average precipitation of 98 mm – the highest in the whole year. The average high temperature drops to 70°F (19°C) while the average low temperature decreases to 48°F (9°C).
October sees a sharp drop in average temperatures as fall goes into full swing. The average high temperature sinks to 56°F (13°C) and the average low temperature goes down to 38°F (3°C).
In November things get even colder as the average high and average low temperatures drop down to 42°F (6°C) and 30°F (-2°C) respectively.
December is the third coldest month of the year and the start of the winter season on Mackinac Island where the average low temperature is at a frigid 30°F (-2°C). The high temperatures average at 31°F (-1°C).
The best time to visit Mackinac Island to avoid the hordes of tourist is during the month of June. However, weather can be quite unpredictable at this time. If you seek a combination of the best weather and manageable crowds, plan your visit in the first half of July. To catch the sailboat races, an action packed time in Mackinac Island, make sure to come in the second half of July.
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