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Hazardous Weather Conditions

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Overcast

16°C

61°F

Humidity 94%
Wind Speed S 11 km/h
Barometer 29.78 in
Dewpoint 15°C (59°F)
Visibility 16 km
Last update 16 May 6:45 am CDT
Extended Forecast for

Janesville WI

  • Today

    Today: Mostly cloudy through mid morning, then gradual clearing, with a high near 29. West wind 10 to 15 km/h.

    High: 29 °C

    Becoming
    Sunny

  • Tonight

    Tonight: A 50 percent chance of showers and thunderstorms, mainly after 9pm. Increasing clouds, with a low around 14. Calm wind.

    Low: 14 °C

    Chance
    Showers

  • Sunday

    Sunday: Showers and thunderstorms likely, mainly before 1pm. Mostly cloudy, with a high near 29. East wind 15 to 20 km/h becoming south 20 to 25 km/h in the afternoon. Chance of precipitation is 60%. New rainfall amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.

    High: 29 °C

    Showers
    Likely then
    Chance
    Showers

  • Sunday Night

    Sunday Night: A slight chance of showers between 1am and 4am, then a slight chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 19. South wind around 25 km/h, with gusts as high as 45 km/h. Chance of precipitation is 20%.

    Low: 19 °C

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Monday

    Monday: Showers and possibly a thunderstorm. High near 28. South wind 25 to 30 km/h, with gusts as high as 45 km/h. Chance of precipitation is 80%. New rainfall amounts between 2.5 and 5 mm possible.

    High: 28 °C

    Showers

  • Monday Night

    Monday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 17. South wind around 25 km/h, with gusts as high as 45 km/h. Chance of precipitation is 70%. New rainfall amounts between 5 and 7.5 mm possible.

    Low: 17 °C

    Chance
    T-storms then
    Showers
    Likely

  • Tuesday

    Tuesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 26. Breezy, with a southwest wind 25 to 35 km/h, with gusts as high as 55 km/h. Chance of precipitation is 60%. New rainfall amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.

    High: 26 °C

    Showers
    Likely and
    Breezy

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 9. Northwest wind 15 to 25 km/h.

    Low: 9 °C

    Slight Chance
    Showers

  • Wednesday

    Wednesday: Partly sunny, with a high near 17.

    High: 17 °C

    Partly Sunny

Detailed Forecast

Today
Mostly cloudy through mid morning, then gradual clearing, with a high near 29. West wind 10 to 15 km/h.
Tonight
A 50 percent chance of showers and thunderstorms, mainly after 9pm. Increasing clouds, with a low around 14. Calm wind.
Sunday
Showers and thunderstorms likely, mainly before 1pm. Mostly cloudy, with a high near 29. East wind 15 to 20 km/h becoming south 20 to 25 km/h in the afternoon. Chance of precipitation is 60%. New rainfall amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.
Sunday Night
A slight chance of showers between 1am and 4am, then a slight chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 19. South wind around 25 km/h, with gusts as high as 45 km/h. Chance of precipitation is 20%.
Monday
Showers and possibly a thunderstorm. High near 28. South wind 25 to 30 km/h, with gusts as high as 45 km/h. Chance of precipitation is 80%. New rainfall amounts between 2.5 and 5 mm possible.
Monday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 17. South wind around 25 km/h, with gusts as high as 45 km/h. Chance of precipitation is 70%. New rainfall amounts between 5 and 7.5 mm possible.
Tuesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 26. Breezy, with a southwest wind 25 to 35 km/h, with gusts as high as 55 km/h. Chance of precipitation is 60%. New rainfall amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.
Tuesday Night
A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 9. Northwest wind 15 to 25 km/h.
Wednesday
Partly sunny, with a high near 17.
Wednesday Night
Partly cloudy, with a low around 5.
Thursday
Mostly sunny, with a high near 19.
Thursday Night
Partly cloudy, with a low around 7.
Friday
Mostly sunny, with a high near 22.
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ABOUT THIS FORECAST

 
Point Forecast:
Janesville WI
 42.67°N 89.04°W (Elev. 774 m)
Last Update:
6:31 am CDT May 16, 2026
Forecast Valid:
7am CDT May 16, 2026-6pm CDT May 22, 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