Siskiwit Lake Weather Forecast

    • 57
    • 70

    Decreasing Clouds

    • 57
    • 65

    Partly Sunny

    • 53
    • 64

    Mostly Cloudy

    • 50
    • 58

    Mostly Cloudy

    • 51
    • 54

    Mostly Cloudy

    • 53
    • 57

    Mostly Cloudy

    • 53
    • 57

    Mostly Cloudy

Today 15 Sep Keweenaw

Sunny. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 15 Sep Keweenaw

Partly cloudy. A slight chance of Showers. Patchy fog. Lows in the upper 50s. South Winds 5 to 10 Mph. Chance of rain 20 percent.

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Siskiwit Lake Temperature Statistics

September Temperature

Copper Harbor (56.5 miles)

  • Lowest 4 September, 2025

    46.9 °F

  • Average September

    58.6 °F

  • Highest 1 September, 2025

    75.9 °F

Climate (2020–Present)

Copper Harbor (56.5 miles)

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  • Average Low 2020–2025

    38.5 °F

  • Average 2020–2025

    44.7 °F

  • Average High 2020–2025

    50.9 °F
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