Big Sioux County Park Weather Forecast

    • 55
    • 71

    Rain Showers Likely

    • 54
    • 79

    Rain Showers

    • 53
    • 70

    Mostly Cloudy

    • 57
    • 67

    Chance Rain Showers

    • 55
    • 70

    Chance Rain Showers

    • 55
    • 71

    Chance Rain Showers

Today 13 Sep Plymouth

Mostly cloudy with a chance of Showers with a slight chance of Thunderstorms this Morning, then mostly sunny with a chance of Sprinkles this afternoon. Highs around 70. East Winds 5 to 10 Mph. Chance of rain 40 percent.

Tonight 13 Sep Plymouth

Partly cloudy in the Evening, then mostly cloudy with a chance of Showers and Thunderstorms after midnight. Lows in the mid 50s. Southeast Winds 5 to 10 Mph, increasing to 15 to 20 Mph after midnight. Chance of rain 40 percent.

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Big Sioux County Park Temperature Statistics

September Temperature

Le Mars Municipal Airport (18 miles)

  • Lowest 10 September, 2026

    51.8 °F

  • Average September

    76 °F

  • Highest 3 September, 2026

    93.2 °F

Climate (2021–2026)

Le Mars Municipal Airport (18 miles)

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  • Average Low 2021–2026

    36.8 °F

  • Average 2021–2026

    47.9 °F

  • Average High 2021–2026

    59.2 °F
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