Sumner Lake Weather Forecast

    • 12
    • 15

    Snow Showers

    • 21
    • 26

    Snow Showers

    • 16
    • 26

    Chance Snow Showers

    • 14
    • 21

    Slight Chance Snow Showers

    • 11
    • 19

    Mostly Cloudy

    • 8
    • 17

    Mostly Cloudy

Today 7 Dec Keweenaw

Scattered snow Showers in the Morning, then isolated snow Showers in the afternoon. Mostly cloudy. Highs 14 to 19. North Winds 10 to 15 Mph, becoming northwest 5 to 15 Mph in the afternoon. Chance of snow 30 percent.

Tonight 7 Dec Keweenaw

Mostly cloudy with a 20 percent chance of snow Showers. Lows 8 to 13 above. Northwest Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming light west after midnight.

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Sumner Lake Temperature Statistics

December Temperature

Copper Harbor (53.4 miles)

  • Lowest 4 December, 2025

    10.9 °F

  • Average December

    18.7 °F

  • Highest 3 December, 2025

    28 °F

Climate (2020–Present)

Copper Harbor (53.4 miles)

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  • Average Low 2020–2025

    38.7 °F

  • Average 2020–2025

    44.9 °F

  • Average High 2020–2025

    51.1 °F
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