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.

Mostly Cloudy and Breezy

70°F

21°C

Humidity 69%
Wind Speed W 22 G 28 mph
Barometer 29.97 in
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 19 May 2:45 pm CDT
Extended Forecast for

Janesville WI

  • Tonight

    Tonight: Mostly cloudy, with a low around 44. Northwest wind 5 to 15 mph.

    Low: 44 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 63. North wind around 10 mph.

    High: 63 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 41. Northeast wind 5 to 10 mph.

    Low: 41 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 62. East wind 10 to 15 mph.

    High: 62 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 45. East wind around 10 mph.

    Low: 45 °F

    Mostly Cloudy

  • Friday

    Friday: A 50 percent chance of showers. Mostly cloudy, with a high near 62. East wind 10 to 15 mph.

    High: 62 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 47. East wind 5 to 15 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 47 °F

    Showers
    Likely

  • Saturday

    Saturday: Mostly cloudy, with a high near 71. Northeast wind around 5 mph becoming northwest in the afternoon.

    High: 71 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 44. Northwest wind 5 to 15 mph.
Wednesday
Mostly sunny, with a high near 63. North wind around 10 mph.
Wednesday Night
Mostly cloudy, with a low around 41. Northeast wind 5 to 10 mph.
Thursday
Partly sunny, with a high near 62. East wind 10 to 15 mph.
Thursday Night
Mostly cloudy, with a low around 45. East wind around 10 mph.
Friday
A 50 percent chance of showers. Mostly cloudy, with a high near 62. East wind 10 to 15 mph.
Friday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 47. East wind 5 to 15 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Mostly cloudy, with a high near 71. Northeast wind around 5 mph becoming northwest in the afternoon.
Saturday Night
Mostly cloudy, with a low around 51.
Sunday
A 20 percent chance of showers after 1pm. Partly sunny, with a high near 78.
Sunday Night
Partly cloudy, with a low around 52.
Memorial Day
Mostly sunny, with a high near 82.
Monday Night
Partly cloudy, with a low around 57.
Tuesday
A 20 percent chance of showers. Partly sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Janesville WI
 42.67°N 89.04°W (Elev. 774 ft)
Last Update:
3:17 pm CDT May 19, 2026
Forecast Valid:
3pm CDT May 19, 2026-6pm CDT May 26, 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