South Sioux City Weather Forecast

    • 68
    • 95

    Increasing Clouds

    • 64
    • 87

    Chance Thunderstorms

    • 64
    • 87

    Slight Chance Thunderstorms

    • 61
    • 86

    Rain Showers Likely

    • 58
    • 77

    Chance Thunderstorms

    • 55
    • 77

    Chance Rain Showers

Today 13 Sep Dakota

Mostly sunny. Highs in the lower 90s. South Winds 10 to 15 Mph.

Tonight 13 Sep Dakota

Mostly cloudy. Lows in the upper 60s. South Winds 10 to 15 Mph.

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South Sioux City Temperature Statistics

September Temperature

Sioux City, Sioux Gateway Airport (4.3 miles)

  • Lowest 7 September, 2025

    37.9 °F

  • Average September

    61.9 °F

  • Highest 11 September, 2025

    84.9 °F

Climate (2020–Present)

Sioux City, Sioux Gateway Airport (4.3 miles)

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  • Average Low 2020–2025

    38.8 °F

  • Average 2020–2025

    50.7 °F

  • Average High 2020–2025

    62.6 °F
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