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.

Mostly Cloudy

43°F

6°C

Humidity 49%
Wind Speed SW 12 mph
Barometer 29.83 in
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill37°F (3°C)
Last update 26 Feb 3:45 pm CST
Extended Forecast for

Janesville WI

  • Tonight

    Tonight: Mostly clear, with a low around 27. Southwest wind around 5 mph.

    Low: 27 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 59. Southwest wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 59 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 24. West wind 5 to 10 mph becoming north after midnight.

    Low: 24 °F

    Partly Cloudy

  • Saturday

    Saturday: Snow likely. Cloudy, with a high near 29. North wind 5 to 10 mph. Chance of precipitation is 60%. New snow accumulation of around an inch possible.

    High: 29 °F

    Snow Likely

  • Saturday Night

    Saturday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 13. North wind around 5 mph.

    Low: 13 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Mostly sunny, with a high near 30. Northeast wind around 5 mph.

    High: 30 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 15. Northeast wind around 5 mph becoming calm in the evening.

    Low: 15 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 36. East wind 5 to 10 mph becoming southeast in the afternoon.

    High: 36 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 22.

    Low: 22 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 27. Southwest wind around 5 mph.
Friday
Sunny, with a high near 59. Southwest wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 30 mph.
Friday Night
Partly cloudy, with a low around 24. West wind 5 to 10 mph becoming north after midnight.
Saturday
Snow likely. Cloudy, with a high near 29. North wind 5 to 10 mph. Chance of precipitation is 60%. New snow accumulation of around an inch possible.
Saturday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 13. North wind around 5 mph.
Sunday
Mostly sunny, with a high near 30. Northeast wind around 5 mph.
Sunday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 15. Northeast wind around 5 mph becoming calm in the evening.
Monday
Mostly sunny, with a high near 36. East wind 5 to 10 mph becoming southeast in the afternoon.
Monday Night
Mostly cloudy, with a low around 22.
Tuesday
A chance of rain and snow, mainly after noon. Mostly cloudy, with a high near 41. Chance of precipitation is 30%.
Tuesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 25.
Wednesday
A 40 percent chance of rain. Mostly cloudy, with a high near 47.
Wednesday Night
Rain likely. Cloudy, with a low around 34. Chance of precipitation is 60%.
Thursday
A 50 percent chance of rain. Mostly cloudy, with a high near 50.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Janesville WI
 42.69°N 89.01°W (Elev. 863 ft)
Last Update:
1:37 pm CST Feb 26, 2026
Forecast Valid:
4pm CST Feb 26, 2026-6pm CST Mar 5, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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