North Sioux City Weather Forecast

    • 58
    • 71

    Cloudy

    • 54
    • 64

    Rain Showers Likely

    • 49
    • 60

    Rain Showers Likely

    • 46
    • 63

    Partly Sunny

    • 52
    • 66

    Chance Rain Showers

    • 55
    • 67

    Slight Chance Rain Showers

Today 19 Sep Union

Cloudy. A slight chance of Showers early this morning. Patchy fog early this morning. Not as warm with Highs in the upper 60s. North Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 19 Sep Union

Cloudy. Lows in the upper 50s. North Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

North Sioux City Temperature Statistics

September Temperature

Sioux City, Sioux Gateway Airport (9.9 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 (9.9 miles)

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  • Average Low 2021–2026

    39.1 °F

  • Average 2021–2026

    51.3 °F

  • Average High 2021–2026

    63.4 °F
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