Santee Weather Forecast

    • 57
    • 69

    Chance Thunderstorms

    • 55
    • 82

    Rain Showers

    • 52
    • 68

    Mostly Cloudy

    • 57
    • 66

    Chance Rain Showers

    • 56
    • 71

    Chance Rain Showers

    • 54
    • 72

    Chance Rain Showers

Today 13 Sep Knox

Partly sunny. A chance of Showers this morning. Highs in the upper 60s. East Winds 10 to 15 Mph. Chance of rain 30 percent.

Tonight 13 Sep Knox

Mostly cloudy. A chance of Showers with a slight chance of Thunderstorms after midnight. Breezy with Lows in the upper 50s. Southeast Winds 10 to 15 Mph with Gusts up to 25 Mph, increasing to 20 to 25 Mph with Gusts up to 35 Mph after midnight. Chance of rain 50 percent.

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Santee Temperature Statistics

September Temperature

Yankton, Chan Gurney Municipal Airport (24.2 miles)

  • Lowest 10 September, 2026

    54 °F

  • Average September

    76.1 °F

  • Highest 4 September, 2026

    95 °F

Climate (2021–2026)

Yankton, Chan Gurney Municipal Airport (24.2 miles)

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  • Average Low 2021–2026

    39.4 °F

  • Average 2021–2026

    50.6 °F

  • Average High 2021–2026

    61.8 °F
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