Grass Lake Weather Forecast

    • 70
    • 86

    Thunderstorms

    • 60
    • 83

    Decreasing Clouds

    • 58
    • 81

    Partly Sunny

    • 62
    • 81

    Partly Sunny

    • 70
    • 85

    Rain Showers Likely

    • 62
    • 85

    Partly Sunny

    • 57
    • 78

    Slight Chance Rain Showers

Today 4 Sep Dane

Partly sunny with a 20 percent chance of Showers and Thunderstorms. Heat index Readings 97 to 102. Southwest Winds up to 10 Mph.

Tonight 4 Sep Dane

Partly cloudy. A 20 percent chance of light Showers and Thunderstorms through around midnight. Patchy fog after midnight. Lows in the upper 60s. Northeast Winds up to 5 Mph.

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Grass Lake Temperature Statistics

September Temperature

Madison, Dane County Regional-Truax Field (17.4 miles)

  • Lowest 1 September, 2026

    69.7 °F

  • Average September

    78.2 °F

  • Highest 2 September, 2026

    88 °F

Climate (2021–2026)

Madison, Dane County Regional-Truax Field (17.4 miles)

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  • Average Low 2021–2026

    39.9 °F

  • Average 2021–2026

    49.7 °F

  • Average High 2021–2026

    59.1 °F
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