Big Sioux River Corridor Weather Forecast

    • 31
    • 47

    Rain Showers

    • 10
    • 34

    Flurries

    • 27
    • 38

    Mostly Cloudy

    • 19
    • 37

    Partly Sunny

    • 23
    • 35

    Mostly Cloudy

    • 29
    • 42

    Mostly Cloudy

Today 17 Dec Plymouth

Mostly sunny and breezy. Highs in the lower 40s. Southeast Winds 5 to 10 Mph, increasing to south 20 to 25 Mph with Gusts up to 35 Mph this afternoon.

Tonight 17 Dec Plymouth

Rain, breezy with Lows in the lower 30s. South Winds 15 to 25 Mph, becoming west 15 to 20 Mph after midnight. Chance of rain 80 percent.

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Big Sioux River Corridor Temperature Statistics

December Temperature

Sioux City, Sioux Gateway Airport (19.3 miles)

  • Lowest 14 December, 2025

    -11.9 °F

  • Average December

    19.5 °F

  • Highest 9 December, 2025

    48 °F

Climate (2020–Present)

Sioux City, Sioux Gateway Airport (19.3 miles)

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  • Average Low 2020–2025

    39 °F

  • Average 2020–2025

    50.8 °F

  • Average High 2020–2025

    62.7 °F
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