Lewis and Clark Lake Weather Forecast

    • 62
    • 70

    Chance Rain Showers

    • 60
    • 72

    Mostly Cloudy

    • 61
    • 71

    Rain Showers Likely

    • 58
    • 68

    Chance Rain Showers

    • 57
    • 69

    Chance Rain Showers

    • 53
    • 66

    Slight Chance Rain Showers

    • 53
    • 65

    Partly Sunny

Today 26 Sep Knox

Partly sunny and warmer. Near steady temperature in the upper 60s. Southeast Winds around 5 Mph.

Tonight 26 Sep Knox

Mostly cloudy. A slight chance of Showers in the evening. Patchy fog after midnight. Humid with Lows in the lower 60s. Southeast 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

    68.7 °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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