Isle Royale Weather Forecast

    • 58
    • 75

    Partly Sunny

    • 58
    • 76

    Chance Rain Showers

    • 55
    • 73

    Mostly Sunny

    • 59
    • 72

    Mostly Sunny

    • 63
    • 76

    Chance Rain Showers

    • 61
    • 78

    Chance Rain Showers

    • 60
    • 77

    Partly Sunny

Today 16 Aug Keweenaw

Partly cloudy. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 16 Aug Keweenaw

Mostly clear. Lows in the upper 50s. West Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Isle Royale Temperature Statistics

August Temperature

Copper Harbor (58.4 miles)

  • Lowest 1 August, 2026

    53.1 °F

  • Average August

    64.2 °F

  • Highest 6 August, 2026

    81 °F

Climate (2021–2026)

Copper Harbor (58.4 miles)

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  • Average Low 2021–2026

    38.3 °F

  • Average 2021–2026

    44.4 °F

  • Average High 2021–2026

    50.6 °F
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