Big Sioux River Corridor Weather Forecast

    • 65
    • 90

    Slight Chance Thunderstorms

    • 59
    • 71

    Chance Rain Showers

    • 54
    • 66

    Rain Showers Likely

    • 50
    • 60

    Rain Showers Likely

    • 49
    • 63

    Mostly Cloudy

    • 53
    • 67

    Chance Rain Showers

    • 55
    • 67

    Slight Chance Rain Showers

Today 18 Sep Plymouth

Mostly cloudy in the Morning, then becoming partly sunny. Highs in the upper 60s.

Tonight 18 Sep Plymouth

Mostly cloudy with a slight chance of Showers and Thunderstorms. Patchy fog after midnight. Lows in the mid 60s. Northeast Winds 5 to 10 Mph, becoming north after midnight. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Sioux River Corridor Temperature Statistics

September Temperature

Sioux City, Sioux Gateway Airport (19.3 miles)

  • Lowest 10 September, 2026

    50.6 °F

  • Average September

    72.6 °F

  • Highest 3 September, 2026

    93.7 °F

Climate (2021–2026)

Sioux City, Sioux Gateway Airport (19.3 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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