McCook Lake Weather Forecast

    • 58
    • 69

    Cloudy

    • 54
    • 65

    Rain Showers Likely

    • 49
    • 61

    Rain Showers Likely

    • 46
    • 63

    Partly Sunny

    • 52
    • 67

    Chance Rain Showers

    • 55
    • 68

    Slight Chance Rain Showers

Today 19 Sep Union

Cloudy and not as warm. Near steady temperature in the upper 60s. North Winds around 10 Mph.

Tonight 19 Sep Union

Cloudy. Lows in the upper 50s. North Winds 5 to 10 Mph.

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McCook Lake Temperature Statistics

September Temperature

Sioux City, Sioux Gateway Airport (11.2 miles)

  • Lowest 10 September, 2026

    50.6 °F

  • Average September

    72.4 °F

  • Highest 3 September, 2026

    93.7 °F

Climate (2021–2026)

Sioux City, Sioux Gateway Airport (11.2 miles)

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  • Average Low 2021–2026

    39.1 °F

  • Average 2021–2026

    51.3 °F

  • Average High 2021–2026

    63.4 °F
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