Sumner Lake Weather Forecast

    • 41
    • 47

    Rain Showers

    • 38
    • 45

    Rain Showers

    • 37
    • 43

    Mostly Cloudy

    • 40
    • 44

    Partly Sunny

    • 44
    • 48

    Partly Sunny

    • 46
    • 51

    Mostly Cloudy

Today 21 Oct Keweenaw

Rain Showers. Highs around 49. Northwest Winds 10 to 20 Mph, becoming north 15 to 20 Mph in the afternoon. Chance of rain 90 percent.

Tonight 21 Oct Keweenaw

Rain Showers. Lows around 40. North Winds 10 to 20 Mph with Gusts up to 35 Mph. Chance of rain 100 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sumner Lake Temperature Statistics

October Temperature

Copper Harbor (53.4 miles)

  • Lowest 16 October, 2025

    39 °F

  • Average October

    57.1 °F

  • Highest 4 October, 2025

    82.9 °F

Climate (2020–Present)

Copper Harbor (53.4 miles)

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  • Average Low 2020–2025

    38.7 °F

  • Average 2020–2025

    44.8 °F

  • Average High 2020–2025

    51 °F
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