Isle Royale Weather Forecast

    • 18
    • 23

    Mostly Cloudy

    • 2
    • 23

    Snow Showers

    • 3
    • 9

    Chance Snow Showers

    • 12
    • 19

    Mostly Cloudy

    • 15
    • 23

    Mostly Cloudy

    • 25
    • 34

    Mostly Cloudy

Today 11 Dec Keweenaw

Cloudy. A slight chance of snow Showers in the morning. Highs in the mid 20s. Northwest Winds 5 to 10 Mph with Gusts up to 25 Mph. Chance of snow 20 percent.

Tonight 11 Dec Keweenaw

Cloudy. Lows 17 to 22. Light northwest Winds, becoming west after midnight.

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Isle Royale Temperature Statistics

December Temperature

Copper Harbor (58.4 miles)

  • Lowest 4 December, 2025

    10.9 °F

  • Average December

    18.6 °F

  • Highest 3 December, 2025

    28 °F

Climate (2020–Present)

Copper Harbor (58.4 miles)

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  • Average Low 2020–2025

    38.7 °F

  • Average 2020–2025

    44.9 °F

  • Average High 2020–2025

    51.1 °F
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