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

45°F

7°C

Humidity 66%
Wind Speed Calm
Barometer 29.92 in
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Last update 30 Mar 4:30 am CDT
Extended Forecast for

5 Miles SSW Janesville WI

  • Today

    Today: Sunny, with a high near 76. South wind 5 to 15 mph.

    High: 76 °F

    Sunny

  • Tonight

    Tonight: A slight chance of rain and thunderstorms before 1am, then a slight chance of rain and thunderstorms after 4am. Mostly cloudy, with a low around 61. South wind 5 to 10 mph. Chance of precipitation is 20%.

    Low: 61 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: A chance of rain and thunderstorms before 1pm, then rain and possibly a thunderstorm between 1pm and 4pm, then a chance of rain and thunderstorms after 4pm. High near 71. South wind 10 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 71 °F

    Chance Rain
    then Rain

  • Tuesday Night

    Tuesday Night: A chance of rain and thunderstorms before 10pm, then a chance of rain between 10pm and 1am. Mostly cloudy, with a low around 33. North wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.

    Low: 33 °F

    Chance Rain

  • Wednesday

    Wednesday: A chance of rain after 1pm, mixing with snow after 4pm. Mostly cloudy, with a high near 44. East wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

    High: 44 °F

    Partly Sunny
    then Chance
    Rain/Snow

  • Wednesday Night

    Wednesday Night: Rain, possibly mixed with snow, becoming all rain after 4am. Low around 33. Northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

    Low: 33 °F

    Rain/Snow

  • Thursday

    Thursday: Rain. High near 51. Northeast wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.

    High: 51 °F

    Rain

  • Thursday Night

    Thursday Night: Rain likely, mainly before 1am. Cloudy, with a low around 38. East wind 10 to 15 mph becoming northwest after midnight. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 38 °F

    Rain Likely

  • Friday

    Friday: A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 55.

    High: 55 °F

    Mostly Cloudy
    then Chance
    Rain

Detailed Forecast

Today
Sunny, with a high near 76. South wind 5 to 15 mph.
Tonight
A slight chance of rain and thunderstorms before 1am, then a slight chance of rain and thunderstorms after 4am. Mostly cloudy, with a low around 61. South wind 5 to 10 mph. Chance of precipitation is 20%.
Tuesday
A chance of rain and thunderstorms before 1pm, then rain and possibly a thunderstorm between 1pm and 4pm, then a chance of rain and thunderstorms after 4pm. High near 71. South wind 10 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday Night
A chance of rain and thunderstorms before 10pm, then a chance of rain between 10pm and 1am. Mostly cloudy, with a low around 33. North wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.
Wednesday
A chance of rain after 1pm, mixing with snow after 4pm. Mostly cloudy, with a high near 44. East wind around 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. Low around 33. Northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Thursday
Rain. High near 51. Northeast wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.
Thursday Night
Rain likely, mainly before 1am. Cloudy, with a low around 38. East wind 10 to 15 mph becoming northwest after midnight. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 55.
Friday Night
Rain likely, mainly after 1am. Mostly cloudy, with a low around 38. Chance of precipitation is 60%.
Saturday
Rain likely. Cloudy, with a high near 56. 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 47.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SSW Janesville WI
 42.63°N 89.04°W (Elev. 804 ft)
Last Update:
4:34 am CDT Mar 30, 2026
Forecast Valid:
4am CDT Mar 30, 2026-6pm CDT Apr 5, 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