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

Hazardous Weather Conditions

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Fair

77°F

25°C

Humidity 42%
Wind Speed SW 12 mph
Barometer 29.77 in
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 30 Mar 2:45 pm CDT
Extended Forecast for

Janesville WI

  • Tonight

    Tonight: A chance of showers and thunderstorms before 10pm, then showers likely and possibly a thunderstorm between 10pm and 11pm, then a chance of showers and thunderstorms after 11pm. Mostly cloudy, with a low around 60. South wind 10 to 15 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 60 °F

    Showers
    Likely then
    Chance
    T-storms

  • Tuesday

    Tuesday: Showers and thunderstorms before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. High near 70. South wind 10 to 15 mph becoming northwest in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 70 °F

    Chance
    T-storms then
    Showers

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms, then a chance of showers after 7pm. Mostly cloudy, with a low around 35. North wind 10 to 15 mph. Chance of precipitation is 40%.

    Low: 35 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of rain after 1pm, mixing with snow after 4pm. Mostly cloudy, with a high near 41. Northeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

    High: 41 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

  • Wednesday Night

    Wednesday Night: Rain, possibly mixed with snow, becoming all rain after 4am. Some thunder is also possible. Low around 34. East wind around 15 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.

    Low: 34 °F

    Rain/Snow

  • Thursday

    Thursday: Rain and possibly a thunderstorm before 10am, then rain between 10am and 1pm, then rain and possibly a thunderstorm after 1pm. High near 59. East wind around 15 mph becoming south in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 59 °F

    Rain

  • Thursday Night

    Thursday Night: Rain likely, mainly before 1am. Mostly cloudy, with a low around 41. South wind 10 to 15 mph becoming west after midnight. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 41 °F

    Rain Likely

  • Friday

    Friday: A 20 percent chance of rain after 1pm. Partly sunny, with a high near 61. West wind around 10 mph becoming east in the afternoon.

    High: 61 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Friday Night

    Friday Night: A chance of rain and thunderstorms, then rain likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 42. Chance of precipitation is 70%.

    Low: 42 °F

    Chance
    T-storms then
    Rain Likely

Detailed Forecast

Tonight
A chance of showers and thunderstorms before 10pm, then showers likely and possibly a thunderstorm between 10pm and 11pm, then a chance of showers and thunderstorms after 11pm. Mostly cloudy, with a low around 60. South wind 10 to 15 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday
Showers and thunderstorms before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. High near 70. South wind 10 to 15 mph becoming northwest in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday Night
A slight chance of showers and thunderstorms, then a chance of showers after 7pm. Mostly cloudy, with a low around 35. North wind 10 to 15 mph. Chance of precipitation is 40%.
Wednesday
A chance of rain after 1pm, mixing with snow after 4pm. Mostly cloudy, with a high near 41. Northeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
Wednesday Night
Rain, possibly mixed with snow, becoming all rain after 4am. Some thunder is also possible. Low around 34. East wind around 15 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.
Thursday
Rain and possibly a thunderstorm before 10am, then rain between 10am and 1pm, then rain and possibly a thunderstorm after 1pm. High near 59. East wind around 15 mph becoming south in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Thursday Night
Rain likely, mainly before 1am. Mostly cloudy, with a low around 41. South wind 10 to 15 mph becoming west after midnight. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
A 20 percent chance of rain after 1pm. Partly sunny, with a high near 61. West wind around 10 mph becoming east in the afternoon.
Friday Night
A chance of rain and thunderstorms, then rain likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 42. Chance of precipitation is 70%.
Saturday
Rain likely. Mostly cloudy, with a high near 60. Chance of precipitation is 60%.
Saturday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 34.
Sunday
Mostly cloudy, with a high near 48.
Sunday Night
Partly cloudy, with a low around 30.
Monday
Sunny, with a high near 54.
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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:
2:36 pm CDT Mar 30, 2026
Forecast Valid:
3pm CDT Mar 30, 2026-6pm CDT Apr 6, 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