McCook Lake Weather Forecast

    • 74
    • 90

    Partly Sunny

    • 68
    • 92

    Severe Tstms

    • 66
    • 83

    Chance Rain Showers

    • 68
    • 85

    Slight Chance Thunderstorms

    • 71
    • 90

    Mostly Sunny

    • 74
    • 93

    Slight Chance Thunderstorms

    • 71
    • 95

    Slight Chance Thunderstorms

Today 22 Jul Union

Mostly sunny. Highs around 90. South Winds 15 to 20 Mph with Gusts up to 30 Mph. Heat index Values up to 107.

Tonight 22 Jul Union

Mostly clear this Evening, then becoming partly cloudy. Lows in the mid 70s. South Winds 10 to 15 Mph. Heat index Values up to 102 early this evening.

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McCook Lake Temperature Statistics

July Temperature

Sioux City, Sioux Gateway Airport (11.2 miles)

  • Lowest 17 July, 2025

    56.6 °F

  • Average July

    75.2 °F

  • Highest 3 July, 2025

    93.7 °F

Climate (2020–Present)

Sioux City, Sioux Gateway Airport (11.2 miles)

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  • Average Low 2020–2025

    38.7 °F

  • Average 2020–2025

    50.6 °F

  • Average High 2020–2025

    62.6 °F
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