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

32°F

0°C

Humidity 80%
Wind Speed NW 12 mph
Barometer 30.07 in
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill23°F (-5°C)
Last update 10 Feb 8:45 pm CST
Extended Forecast for

Janesville WI

  • Tonight

    Tonight: Partly cloudy, with a low around 23. Northwest wind 5 to 10 mph.

    Low: 23 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 37. Northwest wind 5 to 10 mph.

    High: 37 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 21. Northwest wind around 5 mph becoming calm.

    Low: 21 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Cloudy, then gradually becoming mostly sunny, with a high near 39. Calm wind becoming south around 5 mph.

    High: 39 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 25. Calm wind.

    Low: 25 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 46. Calm wind becoming southwest around 5 mph in the morning.

    High: 46 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 27. Southwest wind around 5 mph becoming calm in the evening.

    Low: 27 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 49. Calm wind becoming south around 5 mph in the morning.

    High: 49 °F

    Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of rain after midnight. Partly cloudy, with a low around 32.

    Low: 32 °F

    Partly Cloudy
    then Slight
    Chance Rain

Detailed Forecast

Tonight
Partly cloudy, with a low around 23. Northwest wind 5 to 10 mph.
Wednesday
Sunny, with a high near 37. Northwest wind 5 to 10 mph.
Wednesday Night
Increasing clouds, with a low around 21. Northwest wind around 5 mph becoming calm.
Thursday
Cloudy, then gradually becoming mostly sunny, with a high near 39. Calm wind becoming south around 5 mph.
Thursday Night
Mostly clear, with a low around 25. Calm wind.
Friday
Sunny, with a high near 46. Calm wind becoming southwest around 5 mph in the morning.
Friday Night
Mostly clear, with a low around 27. Southwest wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 49. Calm wind becoming south around 5 mph in the morning.
Saturday Night
A 20 percent chance of rain after midnight. Partly cloudy, with a low around 32.
Sunday
A 20 percent chance of rain before noon. Sunny, with a high near 46.
Sunday Night
Partly cloudy, with a low around 30.
Washington's Birthday
Mostly cloudy, with a high near 48.
Monday Night
Mostly cloudy, with a low around 37.
Tuesday
A 20 percent chance of rain. Partly sunny, with a high near 52.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Janesville WI
 42.67°N 89.04°W (Elev. 774 ft)
Last Update:
7:33 pm CST Feb 10, 2026
Forecast Valid:
8pm CST Feb 10, 2026-6pm CST Feb 17, 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