North Sioux City Weather Forecast

    • 32
    • 46

    Increasing Clouds

    • 30
    • 53

    Mostly Sunny

    • 32
    • 44

    Mostly Cloudy

    • 36
    • 53

    Mostly Cloudy

    • 27
    • 55

    Mostly Cloudy

    • 28
    • 41

    Mostly Cloudy

Today 21 Dec Union

Sunny. Highs in the mid 40s. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 21 Dec Union

Mostly cloudy in the Evening, then becoming partly cloudy. Not as cool with Lows in the lower 30s. South Winds 10 to 15 Mph.

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North Sioux City Temperature Statistics

December Temperature

Sioux City, Sioux Gateway Airport (9.9 miles)

  • Lowest 14 December, 2025

    -11.9 °F

  • Average December

    21.9 °F

  • Highest 9 December, 2025

    48 °F

Climate (2020–Present)

Sioux City, Sioux Gateway Airport (9.9 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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