Big Sioux River Corridor Weather Forecast

    • 56
    • 72

    Rain Showers Likely

    • 54
    • 76

    Partly Sunny

    • 61
    • 82

    Mostly Sunny

    • 65
    • 86

    Mostly Sunny

    • 70
    • 89

    Mostly Sunny

    • 69
    • 91

    Partly Sunny

Today 4 Aug Plymouth

Showers likely with a slight chance of Thunderstorms this Morning, then Showers likely with a chance of Thunderstorms this afternoon. Patchy smoke. Not as warm with Highs in the lower 70s. North Winds 10 to 15 Mph. Chance of rain 70 percent.

Tonight 4 Aug Plymouth

Mostly cloudy. Showers likely with a chance of Thunderstorms in the evening. Patchy smoke in the evening. Lows in the mid 50s. Northwest Winds around 5 Mph, becoming northeast after midnight. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Sioux River Corridor Temperature Statistics

August Temperature

Sioux City, Sioux Gateway Airport (19.3 miles)

  • Lowest 1 August, 2026

    60.1 °F

  • Average August

    72.2 °F

  • Highest 1 August, 2026

    84.9 °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

    51.2 °F

  • Average High 2021–2026

    63.4 °F
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