South Sioux City Weather Forecast

    • 55
    • 63

    Rain Showers Likely

    • 48
    • 59

    Rain Showers

    • 47
    • 63

    Mostly Cloudy

    • 52
    • 65

    Mostly Cloudy

    • 56
    • 68

    Slight Chance Rain Showers

    • 59
    • 71

    Mostly Cloudy

Today 20 Sep Dakota

Cloudy. Patchy fog this morning. A chance of Showers with patchy drizzle this Morning, then Showers likely this afternoon. Near steady temperature in the lower 60s. Northeast Winds around 10 Mph with Gusts up to 20 Mph. Chance of rain 60 percent.

Tonight 20 Sep Dakota

Showers likely. A slight chance of Thunderstorms after midnight. Lows in the mid 50s. Northeast Winds 5 to 10 Mph. Chance of rain 70 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

South Sioux City Temperature Statistics

September Temperature

Sioux City, Sioux Gateway Airport (4.3 miles)

  • Lowest 10 September, 2026

    50.6 °F

  • Average September

    72.4 °F

  • Highest 3 September, 2026

    93.7 °F

Climate (2021–2026)

Sioux City, Sioux Gateway Airport (4.3 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    39.1 °F

  • Average 2021–2026

    51.3 °F

  • Average High 2021–2026

    63.4 °F
Get WillyWeather+ to remove ads