Mackinac Island Weather Forecast

    • 49
    • 63

    Increasing Clouds

    • 46
    • 66

    Partly Sunny

    • 46
    • 59

    Mostly Cloudy

    • 49
    • 59

    Mostly Sunny

    • 49
    • 62

    Partly Sunny

    • 50
    • 64

    Partly Sunny

Today 19 Sep Mackinac Island/Bois Blanc Island

Partly sunny. Highs in the mid 60s. East Winds 10 to 15 Mph.

Tonight 19 Sep Mackinac Island/Bois Blanc Island

Mostly cloudy with a 20 percent chance of rain Showers Early, then partly cloudy after midnight. Lows in the upper 40s. East Winds 5 to 10 Mph.

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Mackinac Island Temperature Statistics

September Temperature

Mackinac Island Airport (0 miles)

  • Lowest 14 September, 2026

    48.2 °F

  • Average September

    63.8 °F

  • Highest 1 September, 2026

    78.8 °F

Climate (2021–2026)

Mackinac Island Airport (0 miles)

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  • Average Low 2021–2026

    38.1 °F

  • Average 2021–2026

    44.5 °F

  • Average High 2021–2026

    50.9 °F
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