Lewis and Clark Lake Weather Forecast

    • 73
    • 91

    Thunderstorms Likely

    • 70
    • 89

    Chance Thunderstorms

    • 73
    • 93

    Rain Showers Likely

    • 63
    • 87

    Slight Chance Rain Showers

    • 60
    • 83

    Partly Sunny

    • 63
    • 84

    Slight Chance Thunderstorms

Today 5 Sep Knox

Partly sunny with a 20 percent chance of Showers. Highs around 90. Southeast Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 5 Sep Knox

Partly cloudy in the Evening, then becoming mostly cloudy. Humid with Lows in the lower 70s. Southeast Winds 5 to 10 Mph with Gusts up to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lewis and Clark Lake Temperature Statistics

September Temperature

Yankton, Chan Gurney Municipal Airport (8.1 miles)

  • Lowest 2 September, 2026

    66.9 °F

  • Average September

    79.4 °F

  • Highest 3 September, 2026

    93 °F

Climate (2021–2026)

Yankton, Chan Gurney Municipal Airport (8.1 miles)

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  • Average Low 2021–2026

    39.3 °F

  • Average 2021–2026

    50.5 °F

  • Average High 2021–2026

    61.8 °F
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