Grass Lake Weather Forecast

    • 66
    • 84

    Chance Thunderstorms

    • 65
    • 84

    Rain Showers

    • 60
    • 79

    Rain Showers

    • 60
    • 80

    Slight Chance Thunderstorms

    • 68
    • 81

    Chance Rain Showers

    • 73
    • 89

    Mostly Sunny

Today 16 Jun Rock

Partly sunny. A 20 percent chance of light Showers in the morning. Highs in the mid 80s. South Winds up to 10 Mph.

Tonight 16 Jun Rock

Partly cloudy. A 50 percent chance of light Showers and Thunderstorms after midnight. Lows in the mid 60s. South Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grass Lake Temperature Statistics

June Temperature

Janesville-Rock County (15.5 miles)

  • Lowest 1 June, 2025

    42.8 °F

  • Average June

    63.2 °F

  • Highest 11 June, 2025

    89.6 °F

Climate (2020–Present)

Janesville-Rock County (15.5 miles)

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  • Average Low 2020–2025

    40.5 °F

  • Average 2020–2025

    48.8 °F

  • Average High 2020–2025

    60.3 °F
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