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.

A Few Clouds and Windy

72°F

22°C

Humidity 31%
Wind Speed SW 30 G 44 mph
Barometer 29.93 in
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Last update 8 Apr 4:45 pm CDT
Extended Forecast for

Janesville WI

  • Tonight

    Tonight: Showers likely, mainly between 10pm and 4am. Increasing clouds, with a low around 45. Breezy, with a south wind 15 to 20 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 35 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 45 °F

    Showers
    Likely and
    Breezy

  • Thursday

    Thursday: Increasing clouds, with a high near 61. West wind 5 to 10 mph.

    High: 61 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: Showers, mainly after 7pm. Low around 41. Northwest wind around 5 mph becoming northeast after midnight. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.

    Low: 41 °F

    Showers

  • Friday

    Friday: Showers likely, mainly before 10am. Cloudy through mid morning, then gradual clearing, with a high near 55. North wind 5 to 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 55 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Friday Night

    Friday Night: Mostly clear, with a low around 32. North wind around 5 mph becoming calm in the evening.

    Low: 32 °F

    Mostly Clear

  • Saturday

    Saturday: Partly sunny, with a high near 58. Light east wind becoming southeast 5 to 10 mph in the morning.

    High: 58 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 49. Southeast wind around 10 mph. Chance of precipitation is 50%.

    Low: 49 °F

    Chance
    T-storms

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 74. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 50%.

    High: 74 °F

    Chance
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.

    Low: 64 °F

    Showers
    Likely

Detailed Forecast

Tonight
Showers likely, mainly between 10pm and 4am. Increasing clouds, with a low around 45. Breezy, with a south wind 15 to 20 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 35 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday
Increasing clouds, with a high near 61. West wind 5 to 10 mph.
Thursday Night
Showers, mainly after 7pm. Low around 41. Northwest wind around 5 mph becoming northeast after midnight. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.
Friday
Showers likely, mainly before 10am. Cloudy through mid morning, then gradual clearing, with a high near 55. North wind 5 to 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
Mostly clear, with a low around 32. North wind around 5 mph becoming calm in the evening.
Saturday
Partly sunny, with a high near 58. Light east wind becoming southeast 5 to 10 mph in the morning.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 49. Southeast wind around 10 mph. Chance of precipitation is 50%.
Sunday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 74. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 50%.
Sunday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Monday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 77. Chance of precipitation is 40%.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 60. Chance of precipitation is 70%.
Tuesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 71. Chance of precipitation is 70%.
Tuesday Night
Showers likely. Mostly cloudy, with a low around 38. Chance of precipitation is 60%.
Wednesday
A 40 percent chance of showers. Mostly cloudy, with a high near 50.
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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:
4:34 pm CDT Apr 8, 2026
Forecast Valid:
5pm CDT Apr 8, 2026-6pm CDT Apr 15, 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