Lewis and Clark Lake Weather Forecast

    • 56
    • 74

    Chance Rain Showers

    • 58
    • 72

    Mostly Cloudy

    • 60
    • 78

    Slight Chance Thunderstorms

    • 60
    • 80

    Partly Sunny

    • 55
    • 79

    Partly Sunny

    • 55
    • 75

    Mostly Sunny

Today 18 Sep Knox

Partly sunny in the Morning, then becoming mostly cloudy. Patchy fog in the morning. A slight chance of Showers. A slight chance of Thunderstorms in the afternoon. Highs in the lower 70s. South Winds 10 to 15 Mph. Chance of rain 20 percent.

Tonight 18 Sep Knox

A slight chance of Thunderstorms in the evening. Mostly cloudy with a slight chance of Showers. Lows in the mid 50s. West 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 7 September, 2025

    41 °F

  • Average September

    66.4 °F

  • Highest 13 September, 2025

    88 °F

Climate (2020–Present)

Yankton, Chan Gurney Municipal Airport (8.1 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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