Santee Sioux Recreation Park Weather Forecast

    • 60
    • 69

    Thunderstorms Likely

    • 56
    • 71

    Chance Thunderstorms

    • 58
    • 72

    Slight Chance Thunderstorms

    • 61
    • 79

    Partly Sunny

    • 60
    • 83

    Slight Chance Thunderstorms

    • 55
    • 82

    Mostly Sunny

Today 17 Sep Knox

Showers likely with a chance of Thunderstorms. Not as warm. Near steady temperature in the upper 60s. Southeast Winds 5 to 10 Mph. Chance of rain 70 percent.

Tonight 17 Sep Knox

A chance of Thunderstorms in the evening. Mostly cloudy with a chance of Showers. Lows in the upper 50s. South Winds around 5 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Santee Sioux Recreation Park Temperature Statistics

September Temperature

Yankton, Chan Gurney Municipal Airport (23.6 miles)

  • Lowest 7 September, 2025

    41 °F

  • Average September

    66.4 °F

  • Highest 13 September, 2025

    88 °F

Climate (2020–Present)

Yankton, Chan Gurney Municipal Airport (23.6 miles)

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  • Average Low 2020–2025

    39.1 °F

  • Average 2020–2025

    50 °F

  • Average High 2020–2025

    61.2 °F
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