Janesville Weather Forecast

    • 34
    • 52

    Rain Showers

    • 28
    • 46

    Rain Showers

    • 39
    • 50

    Slight Chance Rain Showers

    • 32
    • 57

    Mostly Sunny

    • 40
    • 58

    Partly Sunny

    • 34
    • 60

    Partly Sunny

Today 31 Oct Rock

Partly sunny. Scattered light rain Showers late in the afternoon. Highs in the lower 50s. Northwest Winds 5 to 10 Mph. Chance of Showers 40 percent.

Tonight 31 Oct Rock

Mostly cloudy with scattered light rain Showers. Lows in the mid 30s. West Winds up to 10 Mph. Chance of Showers 50 percent.

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Janesville Temperature Statistics

October Temperature

Janesville-Rock County (4.3 miles)

  • Lowest 24 October, 2025

    26.6 °F

  • Average October

    53.4 °F

  • Highest 3 October, 2025

    87.8 °F

Climate (2020–Present)

Janesville-Rock County (4.3 miles)

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  • Average Low 2020–2025

    40.6 °F

  • Average 2020–2025

    48.9 °F

  • Average High 2020–2025

    60.4 °F
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