Isle Royale National Park Weather Forecast

    • 64
    • 73

    Rain Showers

    • 62
    • 78

    Rain Showers

    • 61
    • 79

    Partly Sunny

    • 59
    • 78

    Partly Sunny

    • 62
    • 78

    Mostly Cloudy

    • 61
    • 81

    Mostly Cloudy

Today 22 Jul Keweenaw

Partly cloudy. A slight chance of Showers and Thunderstorms this afternoon. Highs in the mid 70s. South Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 22 Jul Keweenaw

Mostly cloudy with a chance of Thunderstorms. A chance of Showers in the Evening, then Showers likely after midnight. Patchy fog. Lows 59 to 64 inland to around 67 at the shore. South Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 70 percent.

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Isle Royale National Park Temperature Statistics

July Temperature

Copper Harbor (60.3 miles)

  • Lowest 7 July, 2025

    49.6 °F

  • Average July

    64.4 °F

  • Highest 13 July, 2025

    85.6 °F

Climate (2020–Present)

Copper Harbor (60.3 miles)

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  • Average Low 2020–2025

    38.5 °F

  • Average 2020–2025

    44.6 °F

  • Average High 2020–2025

    50.8 °F
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