Sumner Lake Weather Forecast

    • 34
    • 44

    Becoming Sunny

    • 35
    • 48

    Mostly Sunny

    • 40
    • 64

    Partly Sunny

    • 39
    • 53

    Partly Sunny

    • 42
    • 60

    Mostly Cloudy

    • 42
    • 61

    Partly Sunny

Today 7 May Keweenaw

Much Colder. Mostly sunny. Highs 42 to 47. Northeast Winds 5 to 15 Mph with Gusts up to 25 Mph.

Tonight 7 May Keweenaw

Clear. Lows around 34. North Winds 5 to 10 Mph, becoming east after midnight.

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Sumner Lake Temperature Statistics

May Temperature

Copper Harbor (53.4 miles)

  • Lowest 3 May, 2025

    35.7 °F

  • Average May

    43.4 °F

  • Highest 4 May, 2025

    59 °F

Climate (2020–Present)

Copper Harbor (53.4 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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