Grass Lake Weather Forecast

    • 48
    • 63

    Cloudy

    • 43
    • 58

    Mostly Cloudy

    • 45
    • 63

    Mostly Sunny

    • 51
    • 66

    Mostly Cloudy

    • 53
    • 67

    Slight Chance Rain Showers

    • 55
    • 69

    Mostly Cloudy

Today 20 Sep Codington

Cloudy with a 20 percent chance of Showers. Near steady temperature in the upper 50s. East Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 20 Sep Codington

Cloudy. A slight chance of Showers in the Evening, then a chance of Showers after midnight. Lows in the upper 40s. East Winds around 10 Mph with Gusts up to 20 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grass Lake Temperature Statistics

September Temperature

Watertown, Watertown Municipal Airport (16.2 miles)

  • Lowest 16 September, 2026

    44.7 °F

  • Average September

    68.3 °F

  • Highest 3 September, 2026

    93.7 °F

Climate (2021–2026)

Watertown, Watertown Municipal Airport (16.2 miles)

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  • Average Low 2021–2026

    35.2 °F

  • Average 2021–2026

    45.5 °F

  • Average High 2021–2026

    56 °F
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