McCook Lake Weather Forecast

    • 68
    • 91

    Partly Sunny

    • 64
    • 87

    Chance Thunderstorms

    • 64
    • 87

    Mostly Sunny

    • 61
    • 86

    Rain Showers Likely

    • 59
    • 77

    Rain Showers Likely

    • 56
    • 76

    Chance Rain Showers

Today 13 Sep Union

Mostly sunny. Highs in the lower 90s. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 13 Sep Union

Mostly cloudy in the Evening, then becoming partly cloudy. Lows in the upper 60s. South Winds 5 to 10 Mph.

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McCook Lake Temperature Statistics

September Temperature

Sioux City, Sioux Gateway Airport (11.2 miles)

  • Lowest 7 September, 2025

    37.9 °F

  • Average September

    61.9 °F

  • Highest 11 September, 2025

    84.9 °F

Climate (2020–Present)

Sioux City, Sioux Gateway Airport (11.2 miles)

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  • Average Low 2020–2025

    38.8 °F

  • Average 2020–2025

    50.7 °F

  • Average High 2020–2025

    62.6 °F
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