Grass Lake Weather Forecast

    • 33
    • 54

    Increasing Clouds

    • 24
    • 43

    Chance Rain

    • 30
    • 37

    Mostly Cloudy

    • 26
    • 50

    Mostly Cloudy

    • 16
    • 34

    Mostly Cloudy

    • 18
    • 28

    Mostly Cloudy

Today 30 Jan Rock

Sunny until late afternoon then becoming partly sunny. A 20 percent chance of light rain late in the afternoon. Highs in the lower 50s. Southwest Winds 5 to 15 Mph with Gusts to around 30 Mph.

Tonight 30 Jan Rock

Mostly clear. Near steady temperature in the upper 20s. South Winds up to 5 Mph.

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Grass Lake Temperature Statistics

January Temperature

Janesville-Rock County (15.5 miles)

  • Lowest 21 January, 2025

    -13 °F

  • Average January

    16.5 °F

  • Highest 17 January, 2025

    53.6 °F

Climate (2020–Present)

Janesville-Rock County (15.5 miles)

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  • Average Low 2020–2025

    40.6 °F

  • Average 2020–2025

    48.8 °F

  • Average High 2020–2025

    60.2 °F
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