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.

Rain Thunderstorm in Vicinity

45°F

7°C

Humidity 93%
Wind Speed N 12 mph
Barometer 29.85 in
Dewpoint 43°F (6°C)
Visibility 2.00 mi
Wind Chill39°F (4°C)
Last update 31 Mar 2:45 pm CDT
Extended Forecast for

Janesville WI

  • This Afternoon

    This Afternoon: Scattered showers and thunderstorms, mainly before 4pm. Mostly cloudy, with a steady temperature around 52. North wind around 15 mph. Chance of precipitation is 50%.

    High: 52 °F

    Scattered
    T-storms

  • Tonight

    Tonight: Mostly cloudy, with a low around 35. North wind around 10 mph.

    Low: 35 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Isolated showers after 5pm. Mostly cloudy, with a high near 45. East wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 10%.

    High: 45 °F

    Mostly Cloudy
    then Isolated
    Showers

  • Wednesday Night

    Wednesday Night: Isolated showers before 7pm, then rain between 7pm and 10pm, then rain and possibly a thunderstorm after 10pm. Low around 37. East wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 37 °F

    Showers

  • Thursday

    Thursday: Rain and possibly a thunderstorm. High near 70. Breezy, with an east wind 15 to 20 mph becoming south in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 70 °F

    Rain and
    Breezy

  • Thursday Night

    Thursday Night: A chance of rain and thunderstorms before 10pm, then a chance of rain between 10pm and 1am. Mostly cloudy, with a low around 42. West wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 50%.

    Low: 42 °F

    Chance Rain

  • Friday

    Friday: A 20 percent chance of rain and thunderstorms after 1pm. Mostly sunny, with a high near 63. West wind 5 to 10 mph becoming southeast in the afternoon.

    High: 63 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: Rain and possibly a thunderstorm. Low around 44. East wind around 15 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 44 °F

    Rain

  • Saturday

    Saturday: A 40 percent chance of rain. Cloudy, with a high near 56. Breezy.

    High: 56 °F

    Chance Rain
    and Breezy

Detailed Forecast

This Afternoon
Scattered showers and thunderstorms, mainly before 4pm. Mostly cloudy, with a steady temperature around 52. North wind around 15 mph. Chance of precipitation is 50%.
Tonight
Mostly cloudy, with a low around 35. North wind around 10 mph.
Wednesday
Isolated showers after 5pm. Mostly cloudy, with a high near 45. East wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 10%.
Wednesday Night
Isolated showers before 7pm, then rain between 7pm and 10pm, then rain and possibly a thunderstorm after 10pm. Low around 37. East wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Thursday
Rain and possibly a thunderstorm. High near 70. Breezy, with an east wind 15 to 20 mph becoming south in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Thursday Night
A chance of rain and thunderstorms before 10pm, then a chance of rain between 10pm and 1am. Mostly cloudy, with a low around 42. West wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 50%.
Friday
A 20 percent chance of rain and thunderstorms after 1pm. Mostly sunny, with a high near 63. West wind 5 to 10 mph becoming southeast in the afternoon.
Friday Night
Rain and possibly a thunderstorm. Low around 44. East wind around 15 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
A 40 percent chance of rain. Cloudy, with a high near 56. Breezy.
Saturday Night
A 20 percent chance of rain before 1am. Mostly cloudy, with a low around 31.
Sunday
Partly sunny, with a high near 48.
Sunday Night
Mostly clear, with a low around 28.
Monday
Mostly sunny, with a high near 55.
Monday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 36.
Tuesday
Mostly cloudy, with a high near 54.
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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:
2:36 pm CDT Mar 31, 2026
Forecast Valid:
3pm CDT Mar 31, 2026-6pm CDT Apr 7, 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