Sumner Lake Weather Forecast

    • 60
    • 71

    Increasing Clouds

    • 57
    • 70

    Rain Showers

    • 57
    • 68

    Mostly Sunny

    • 59
    • 67

    Partly Sunny

    • 59
    • 69

    Partly Sunny

    • 60
    • 70

    Partly Sunny

Today 6 Aug Keweenaw

Sunny. Southwest Winds 10 to 20 Mph Inland, except south 5 to 10 Mph near the shore.

Tonight 6 Aug Keweenaw

Mostly clear. Lows in the mid 60s. South Winds 5 to 15 Mph, becoming southwest 10 to 15 Mph after midnight.

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Sumner Lake Temperature Statistics

August Temperature

Copper Harbor (53.4 miles)

  • Lowest 1 August, 2026

    53.1 °F

  • Average August

    63.1 °F

  • Highest 4 August, 2026

    72 °F

Climate (2021–2026)

Copper Harbor (53.4 miles)

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  • Average Low 2021–2026

    38.3 °F

  • Average 2021–2026

    44.5 °F

  • Average High 2021–2026

    50.6 °F
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