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

50°F

10°C

Humidity 67%
Wind Speed N 13 mph
Barometer 30.28 in
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 10 Apr 12:45 pm CDT
Extended Forecast for

Janesville WI

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 51. Northwest wind around 10 mph.

    High: 51 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 33. North wind around 5 mph becoming calm in the evening.

    Low: 33 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 4pm. Increasing clouds, with a high near 52. Southeast wind 5 to 10 mph.

    High: 52 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Cloudy, with a low around 46. Southeast wind 10 to 15 mph. Chance of precipitation is 50%.

    Low: 46 °F

    Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 74. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 74 °F

    Breezy.
    Slight Chance
    Showers then
    Showers
    Likely

  • Sunday Night

    Sunday Night: A 50 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 61. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph.

    Low: 61 °F

    Chance
    Showers and
    Breezy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 77. Southwest wind 10 to 15 mph.

    High: 77 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 63. South wind 10 to 15 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 63 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 70%.

    High: 80 °F

    Chance
    Showers then
    Showers
    Likely

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 51. Northwest wind around 10 mph.
Tonight
Mostly clear, with a low around 33. North wind around 5 mph becoming calm in the evening.
Saturday
A 20 percent chance of showers and thunderstorms after 4pm. Increasing clouds, with a high near 52. Southeast wind 5 to 10 mph.
Saturday Night
A chance of showers and thunderstorms. Cloudy, with a low around 46. Southeast wind 10 to 15 mph. Chance of precipitation is 50%.
Sunday
A slight chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 74. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
A 50 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 61. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 77. Southwest wind 10 to 15 mph.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 63. South wind 10 to 15 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 70%.
Tuesday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers. Low around 59. Chance of precipitation is 80%.
Wednesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 70.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 50.
Thursday
A 30 percent chance of showers. Mostly sunny, with a high near 75.
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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:
12:31 pm CDT Apr 10, 2026
Forecast Valid:
1pm CDT Apr 10, 2026-6pm CDT Apr 16, 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