Isle Royale National Park Weather Forecast

    • 39
    • 69

    Increasing Clouds

    • 34
    • 49

    Mostly Sunny

    • 34
    • 48

    Mostly Sunny

    • 40
    • 61

    Chance Rain Showers

    • 37
    • 59

    Partly Sunny

    • 41
    • 57

    Partly Sunny

Today 6 May Keweenaw

Sunny. Highs 64 to 69 inland to around 61 at the shore. Temperature falling into the middle 50s in the afternoon. West Winds 5 to 15 Mph.

Tonight 6 May Keweenaw

Partly cloudy with a 20 percent chance of rain Showers. Lows around 39. North Winds 10 to 20 Mph, becoming northeast 10 to 15 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Isle Royale National Park Temperature Statistics

May Temperature

Copper Harbor (60.3 miles)

  • Lowest 2 May, 2025

    36 °F

  • Average May

    41.2 °F

  • Highest 1 May, 2025

    50.6 °F

Climate (2020–Present)

Copper Harbor (60.3 miles)

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  • Average Low 2020–2025

    38.6 °F

  • Average 2020–2025

    44.6 °F

  • Average High 2020–2025

    50.7 °F
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