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.

Fair

-4°F

-20°C

Humidity 84%
Wind Speed Calm
Barometer 30.38 in
Dewpoint -8°F (-22°C)
Visibility 10.00 mi
Last update 4 Feb 5:15 am CST
Extended Forecast for

Janesville WI

  • Today

    Today: Sunny, with a high near 25. Calm wind becoming northwest around 5 mph.

    High: 25 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 10. Calm wind becoming southwest around 5 mph after midnight.

    Low: 10 °F

    Increasing
    Clouds

  • Thursday

    Thursday: A 20 percent chance of snow before noon. Mostly cloudy, with a high near 32. Southwest wind 5 to 10 mph.

    High: 32 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Thursday Night

    Thursday Night: A chance of 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

    Mostly Cloudy
    then Chance
    Freezing Rain

  • Friday

    Friday: Mostly cloudy, with a high near 38. Northwest wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 38 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Partly cloudy, with a low around 10. North wind 5 to 10 mph.

    Low: 10 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 27. Calm wind becoming southeast around 5 mph in the morning.

    High: 27 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 20. Southeast wind around 5 mph.

    Low: 20 °F

    Chance Snow

  • Sunday

    Sunday: Partly sunny, with a high near 33.

    High: 33 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 25. Calm wind becoming northwest around 5 mph.
Tonight
Increasing clouds, with a low around 10. Calm wind becoming southwest around 5 mph after midnight.
Thursday
A 20 percent chance of snow before noon. Mostly cloudy, with a high near 32. Southwest wind 5 to 10 mph.
Thursday Night
A chance of freezing rain after midnight. Mostly cloudy, with a low around 27. West wind 5 to 10 mph. Chance of precipitation is 30%.
Friday
Mostly cloudy, with a high near 38. Northwest wind 10 to 15 mph, with gusts as high as 30 mph.
Friday Night
Partly cloudy, with a low around 10. North wind 5 to 10 mph.
Saturday
Mostly sunny, with a high near 27. Calm wind becoming southeast around 5 mph in the morning.
Saturday Night
A 30 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 20. Southeast wind around 5 mph.
Sunday
Partly sunny, with a high near 33.
Sunday Night
Partly cloudy, with a low around 20.
Monday
Mostly sunny, with a high near 40.
Monday Night
Partly cloudy, with a low around 27.
Tuesday
A 20 percent chance of rain. Partly sunny, with a high near 43.
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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:
5:16 am CST Feb 4, 2026
Forecast Valid:
5am CST Feb 4, 2026-6pm CST Feb 10, 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