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

59°F

15°C

Humidity 59%
Wind Speed SW 12 G 17 mph
Barometer 29.96 in
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 9 Apr 12:30 am CDT
Extended Forecast for

5 Miles SSW Janesville WI

  • Overnight

    Overnight: Showers and thunderstorms before 3am, then showers likely and possibly a thunderstorm between 3am and 4am, then scattered showers after 4am. Low around 45. West wind 10 to 15 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 45 °F

    Showers

  • Thursday

    Thursday: Increasing clouds, with a high near 62. West wind around 10 mph.

    High: 62 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: Showers. Low around 43. 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: 43 °F

    Showers

  • Friday

    Friday: A 10 percent chance of showers before 7am. Cloudy through mid morning, then gradual clearing, with a high near 56. North wind 5 to 10 mph.

    High: 56 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Friday Night

    Friday Night: 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 after 1pm. Increasing clouds, with a high near 58. Southeast wind 5 to 15 mph.

    High: 58 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, then showers likely after 10pm. Mostly cloudy, with a low around 49. Southeast wind 10 to 15 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 49 °F

    Showers
    Likely

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 73. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 50%.

    High: 73 °F

    Chance
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 63. Breezy. Chance of precipitation is 60%.

    Low: 63 °F

    Showers
    Likely and
    Breezy

Detailed Forecast

Overnight
Showers and thunderstorms before 3am, then showers likely and possibly a thunderstorm between 3am and 4am, then scattered showers after 4am. Low around 45. West wind 10 to 15 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
Increasing clouds, with a high near 62. West wind around 10 mph.
Thursday Night
Showers. Low around 43. 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
A 10 percent chance of showers before 7am. Cloudy through mid morning, then gradual clearing, with a high near 56. North wind 5 to 10 mph.
Friday Night
Mostly clear, with a low around 33. North wind around 5 mph becoming calm in the evening.
Saturday
A 20 percent chance of showers after 1pm. Increasing clouds, with a high near 58. Southeast wind 5 to 15 mph.
Saturday Night
A chance of showers and thunderstorms, then showers likely after 10pm. Mostly cloudy, with a low around 49. Southeast wind 10 to 15 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Sunday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 73. 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 63. Breezy. 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 59. Chance of precipitation is 70%.
Tuesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 70. 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:
5 Miles SSW Janesville WI
 42.63°N 89.04°W (Elev. 804 ft)
Last Update:
12:31 am CDT Apr 9, 2026
Forecast Valid:
12am CDT Apr 9, 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