South Sioux City Weather Forecast

    • 30
    • 37

    Increasing Clouds

    • 18
    • 39

    Mostly Sunny

    • 30
    • 39

    Mostly Cloudy

    • 32
    • 51

    Partly Sunny

    • 31
    • 46

    Mostly Cloudy

    • 36
    • 52

    Mostly Cloudy

Today 19 Dec Dakota

Mostly sunny. Highs in the upper 30s. Southeast Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 19 Dec Dakota

Partly cloudy in the Evening, then becoming mostly cloudy. Not as cool. Near steady temperature in the mid 30s. South Winds 10 to 15 Mph, becoming northwest after midnight.

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South Sioux City Temperature Statistics

December Temperature

Sioux City, Sioux Gateway Airport (4.3 miles)

  • Lowest 14 December, 2025

    -11.9 °F

  • Average December

    21.5 °F

  • Highest 9 December, 2025

    48 °F

Climate (2020–Present)

Sioux City, Sioux Gateway Airport (4.3 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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