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.

Overcast

41°F

5°C

Humidity 81%
Wind Speed W 14 mph
Barometer 29.85 in
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 7 Mar 4:45 pm CST
Extended Forecast for

Janesville WI

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 33. West wind 5 to 15 mph becoming southwest after midnight.

    Low: 33 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 61. Southwest wind around 15 mph, with gusts as high as 30 mph.

    High: 61 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 44. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 44 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 68. Southwest wind 5 to 10 mph.

    High: 68 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 43. Southwest wind around 5 mph becoming northeast after midnight.

    Low: 43 °F

    Mostly Clear

  • Tuesday

    Tuesday: Rain likely after noon. Increasing clouds, with a high near 64. East wind 5 to 15 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 64 °F

    Sunny then
    Rain Likely

  • Tuesday Night

    Tuesday Night: Rain. Low around 33. North wind 10 to 15 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 33 °F

    Rain

  • Wednesday

    Wednesday: Rain and snow likely, mainly before noon. Cloudy, with a high near 42. Northwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 42 °F

    Rain/Snow
    Likely then
    Chance
    Rain/Snow

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow before midnight. Mostly cloudy, then gradually becoming mostly clear, with a low around 23.

    Low: 23 °F

    Slight Chance
    Snow then
    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 33. West wind 5 to 15 mph becoming southwest after midnight.
Sunday
Sunny, with a high near 61. Southwest wind around 15 mph, with gusts as high as 30 mph.
Sunday Night
Mostly clear, with a low around 44. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Monday
Sunny, with a high near 68. Southwest wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 43. Southwest wind around 5 mph becoming northeast after midnight.
Tuesday
Rain likely after noon. Increasing clouds, with a high near 64. East wind 5 to 15 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Tuesday Night
Rain. Low around 33. North wind 10 to 15 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Wednesday
Rain and snow likely, mainly before noon. Cloudy, with a high near 42. Northwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
A 20 percent chance of snow before midnight. Mostly cloudy, then gradually becoming mostly clear, with a low around 23.
Thursday
Partly sunny, with a high near 46.
Thursday Night
A chance of rain and snow. Mostly cloudy, with a low around 34. Chance of precipitation is 40%.
Friday
A 20 percent chance of rain. Partly sunny, with a high near 56. Breezy.
Friday Night
Partly cloudy, with a low around 26.
Saturday
A 30 percent chance of snow. Mostly cloudy, with a high near 42.
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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:
5:32 pm CST Mar 7, 2026
Forecast Valid:
5pm CST Mar 7, 2026-6pm CDT Mar 14, 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