Grass Lake Weather Forecast

    • 64
    • 84

    Slight Chance Thunderstorms

    • 63
    • 81

    Rain Showers Likely

    • 67
    • 81

    Rain Showers

    • 65
    • 83

    Rain Showers Likely

    • 62
    • 80

    Chance Thunderstorms

    • 59
    • 79

    Slight Chance Thunderstorms

    • 56
    • 76

    Slight Chance Thunderstorms

Today 7 Aug Dane

Mostly cloudy. Southwest Winds around 10 Mph.

Tonight 7 Aug Dane

Mostly cloudy in the Evening, then partly cloudy with slight chance of light Showers and Thunderstorms late in the evening. Partly cloudy with slight chance of light Showers after Midnight, then partly cloudy early in the morning. Patchy fog early in the morning. Lows in the mid 60s. West Winds 5 to 10 Mph. Chance of precipitation 20 percent.

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Grass Lake Temperature Statistics

August Temperature

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

  • Lowest 3 August, 2026

    55.7 °F

  • Average August

    70.1 °F

  • Highest 4 August, 2026

    84.7 °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

    49.8 °F

  • Average High 2021–2026

    59.1 °F
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