McCook Lake Weather Forecast

    • 21
    • 35

    Increasing Clouds

    • 24
    • 41

    Mostly Cloudy

    • 19
    • 45

    Breezy

    • 8
    • 33

    Partly Sunny

    • 28
    • 38

    Mostly Cloudy

    • 19
    • 40

    Partly Sunny

Today 15 Dec Union

Mostly sunny. Not as cool with Highs in the mid 30s. West Winds 5 to 10 Mph.

Tonight 15 Dec Union

Partly cloudy and not as cool. Near steady temperature around 19. South Winds 15 to 20 Mph with Gusts up to 30 Mph.

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McCook Lake Temperature Statistics

December Temperature

Sioux City, Sioux Gateway Airport (11.2 miles)

  • Lowest 4 December, 2025

    -9 °F

  • Average December

    21.3 °F

  • Highest 9 December, 2025

    48 °F

Climate (2020–Present)

Sioux City, Sioux Gateway Airport (11.2 miles)

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  • Average Low 2020–2025

    39 °F

  • Average 2020–2025

    50.8 °F

  • Average High 2020–2025

    62.7 °F
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