Isle Royale Weather Forecast

    • 33
    • 37

    Slight Chance Rain/Snow

    • 31
    • 41

    Mostly Cloudy

    • 32
    • 43

    Partly Sunny

    • 35
    • 45

    Partly Sunny

    • 35
    • 49

    Mostly Cloudy

    • 35
    • 45

    Mostly Cloudy

    • 36
    • 46

    Slight Chance Rain Showers

Today 29 Apr Keweenaw

Partly cloudy with a slight chance of rain and snow Showers. Light north Winds. Chance of precipitation 20 percent.

Tonight 29 Apr Keweenaw

Partly cloudy this Evening, then becoming mostly cloudy. Lows in the lower 30s. Light northwest Winds, becoming north 5 to 10 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Isle Royale Temperature Statistics

April Temperature

Copper Harbor (58.4 miles)

  • Lowest 7 April, 2026

    16 °F

  • Average April

    34 °F

  • Highest 17 April, 2026

    57.9 °F

Climate (2021–Present)

Copper Harbor (58.4 miles)

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  • Average Low 2021–2026

    38.5 °F

  • Average 2021–2026

    44.6 °F

  • Average High 2021–2026

    50.8 °F
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