National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Partly Cloudy

19°F

-7°C

Humidity 63%
Wind Speed Calm
Barometer 30.36 in
Dewpoint 9°F (-13°C)
Visibility 10.00 mi
Last update 4 Feb 5:45 pm CST
Extended Forecast for

Janesville WI

  • Tonight

    Tonight: Increasing clouds, with a low around 11. Calm wind becoming southwest around 5 mph after midnight.

    Low: 11 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Snow likely, mainly before 10am. Cloudy, with a high near 32. Southwest wind 5 to 10 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 32 °F

    Snow Likely
    then Cloudy

  • Thursday Night

    Thursday Night: A chance of snow and freezing rain after midnight. Mostly cloudy, with a low around 27. West wind 5 to 10 mph. Chance of precipitation is 30%.

    Low: 27 °F

    Cloudy then
    Chance Wintry
    Mix

  • Friday

    Friday: A slight chance of snow and freezing rain before 3pm. Mostly cloudy, with a high near 36. Northwest wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.

    High: 36 °F

    Slight Chance
    Wintry Mix

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming clear, with a low around 6. North wind 5 to 15 mph.

    Low: 6 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Increasing clouds, with a high near 22. North wind around 5 mph becoming southeast in the afternoon.

    High: 22 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 17. South wind around 5 mph.

    Low: 17 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 35. South wind around 5 mph.

    High: 35 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 22.

    Low: 22 °F

    Partly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 11. Calm wind becoming southwest around 5 mph after midnight.
Thursday
Snow likely, mainly before 10am. Cloudy, with a high near 32. Southwest wind 5 to 10 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Thursday Night
A chance of snow and freezing rain after midnight. Mostly cloudy, with a low around 27. West wind 5 to 10 mph. Chance of precipitation is 30%.
Friday
A slight chance of snow and freezing rain before 3pm. Mostly cloudy, with a high near 36. Northwest wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.
Friday Night
Mostly cloudy, then gradually becoming clear, with a low around 6. North wind 5 to 15 mph.
Saturday
Increasing clouds, with a high near 22. North wind around 5 mph becoming southeast in the afternoon.
Saturday Night
Mostly cloudy, with a low around 17. South wind around 5 mph.
Sunday
Mostly cloudy, with a high near 35. South wind around 5 mph.
Sunday Night
Partly cloudy, with a low around 22.
Monday
Partly sunny, with a high near 43.
Monday Night
Mostly cloudy, with a low around 29.
Tuesday
Partly sunny, with a high near 42.
Tuesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 28.
Wednesday
A 30 percent chance of rain. Partly sunny, with a high near 39.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Janesville WI
 42.67°N 89.04°W (Elev. 774 ft)
Last Update:
6:22 pm CST Feb 4, 2026
Forecast Valid:
6pm CST Feb 4, 2026-6pm CST Feb 11, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation