Cottonwood Lake Weather Forecast

    • 58
    • 69

    Chance Thunderstorms

    • 54
    • 65

    Chance Rain Showers

    • 55
    • 69

    Partly Sunny

    • 57
    • 76

    Partly Sunny

    • 52
    • 73

    Slight Chance Thunderstorms

    • 52
    • 71

    Mostly Sunny

Today 18 Sep Codington

Patchy fog early this morning. Mostly cloudy with a 50 percent chance of Thunderstorms. Highs in the upper 60s. East Winds 5 to 10 Mph, becoming southeast with Gusts up to 20 Mph this afternoon.

Tonight 18 Sep Codington

Mostly cloudy. A chance of Thunderstorms in the Evening, then a chance of Showers with a slight chance of Thunderstorms after midnight. Lows in the upper 50s. Southeast Winds around 5 Mph. Chance of rain 40 percent.

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Cottonwood Lake Temperature Statistics

September Temperature

Watertown, Watertown Municipal Airport (14.3 miles)

  • Lowest 7 September, 2025

    37.9 °F

  • Average September

    63.1 °F

  • Highest 14 September, 2025

    84 °F

Climate (2020–Present)

Watertown, Watertown Municipal Airport (14.3 miles)

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  • Average Low 2020–2025

    35 °F

  • Average 2020–2025

    45.2 °F

  • Average High 2020–2025

    55.6 °F
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