South Sioux City Weather Forecast

    • 74
    • 90

    Mostly Sunny

    • 68
    • 93

    Thunderstorms Likely

    • 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 Dakota

Mostly sunny with a slight chance of Showers and Thunderstorms. Highs in the lower 90s. South Winds 15 to 20 Mph with Gusts up to 30 Mph. Chance of rain 20 percent. Heat index Values up to 106.

Tonight 22 Jul Dakota

Mostly clear this Evening, then becoming partly cloudy. Lows in the lower 70s. South Winds 10 to 15 Mph. Heat index Values up to 100 early this evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

South Sioux City Temperature Statistics

July Temperature

Sioux City, Sioux Gateway Airport (4.3 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 (4.3 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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