Sumner Lake Weather Forecast

    • 53
    • 60

    Decreasing Clouds

    • 54
    • 60

    Increasing Clouds

    • 54
    • 61

    Rain Showers Likely

    • 52
    • 61

    Chance Rain Showers

    • 46
    • 63

    Partly Sunny

    • 46
    • 58

    Partly Sunny

    • 46
    • 58

    Chance Rain Showers

Today 27 Sep Keweenaw

A chance of rain Showers in the morning. Mostly cloudy. Highs around 56. Chance of rain 30 percent.

Tonight 27 Sep Keweenaw

Partly cloudy. Patchy fog after midnight. Lows around 50. Light west Winds, becoming northwest after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sumner Lake Temperature Statistics

September Temperature

Copper Harbor (53.4 miles)

  • Lowest 22 September, 2026

    39.9 °F

  • Average September

    60.6 °F

  • Highest 1 September, 2026

    80.1 °F

Climate (2021–2026)

Copper Harbor (53.4 miles)

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  • Average Low 2021–2026

    38.2 °F

  • Average 2021–2026

    44.4 °F

  • Average High 2021–2026

    50.5 °F
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