Sumner Lake Weather Forecast

    • 39
    • 47

    Mostly Cloudy

    • 40
    • 49

    Mostly Cloudy

    • 39
    • 50

    Partly Sunny

    • 40
    • 58

    Partly Sunny

    • 42
    • 62

    Partly Sunny

    • 44
    • 66

    Partly Sunny

Today 24 May Keweenaw

Partly cloudy. Highs 51 to 56 inland to around 49 at the shore. North Winds 5 to 10 Mph, becoming northwest in the afternoon.

Tonight 24 May Keweenaw

Partly cloudy in the Evening, then becoming mostly cloudy. Lows around 38. West Winds 5 to 10 Mph, becoming light northwest after midnight.

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Sumner Lake Temperature Statistics

May Temperature

Copper Harbor (53.4 miles)

  • Lowest 8 May, 2025

    33.7 °F

  • Average May

    50.1 °F

  • Highest 13 May, 2025

    82.7 °F

Climate (2020–Present)

Copper Harbor (53.4 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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