Lewis and Clark Lake Weather Forecast

    • 58
    • 69

    Chance Rain Showers

    • 54
    • 62

    Rain Showers

    • 49
    • 59

    Rain Showers Likely

    • 49
    • 64

    Partly Sunny

    • 54
    • 68

    Chance Rain Showers

    • 56
    • 69

    Chance Rain Showers

Today 19 Sep Knox

Cloudy and not as warm. Near steady temperature in the upper 60s. North Winds around 10 Mph with Gusts up to 20 Mph.

Tonight 19 Sep Knox

Cloudy. A slight chance of Showers after midnight. Lows in the upper 50s. North Winds 5 to 10 Mph. Chance of rain 20 percent.

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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 13 September, 2026

    48.9 °F

  • Average September

    71.6 °F

  • Highest 4 September, 2026

    95 °F

Climate (2021–2026)

Yankton, Chan Gurney Municipal Airport (8.1 miles)

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  • Average Low 2021–2026

    39.4 °F

  • Average 2021–2026

    50.5 °F

  • Average High 2021–2026

    61.8 °F
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