Grinnell Memorial Nature Sanctuary Weather Forecast

    • 37
    • 46

    Mostly Cloudy

    • 37
    • 49

    Partly Sunny

    • 37
    • 51

    Partly Sunny

    • 38
    • 53

    Partly Sunny

    • 40
    • 55

    Partly Sunny

    • 43
    • 57

    Mostly Sunny

Today 23 May Keweenaw

Cool. Mostly cloudy with a 20 percent chance of rain Showers. Highs 47 to 52 inland to around 44 at the shore. North Winds 5 to 15 Mph.

Tonight 23 May Keweenaw

Mostly cloudy with a slight chance of Sprinkles. Lows around 38. Light north Winds.

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Grinnell Memorial Nature Sanctuary Temperature Statistics

May Temperature

Copper Harbor (4.3 miles)

  • Lowest 8 May, 2025

    33.7 °F

  • Average May

    50.2 °F

  • Highest 13 May, 2025

    82.7 °F

Climate (2020–Present)

Copper Harbor (4.3 miles)

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  • Average Low 2020–2025

    38.6 °F

  • Average 2020–2025

    44.7 °F

  • Average High 2020–2025

    50.8 °F
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