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.

Partly Cloudy

64°F

18°C

Humidity 52%
Wind Speed N 14 mph
Barometer 29.83 in
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 20 Mar 2:45 pm CDT
Extended Forecast for

Janesville WI

  • Tonight

    Tonight: Mostly cloudy, with a low around 39. North wind 5 to 10 mph becoming light and variable in the evening.

    Low: 39 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 68. Southeast wind 5 to 15 mph becoming southwest in the afternoon.

    High: 68 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 48. Southwest wind 5 to 10 mph becoming north after midnight.

    Low: 48 °F

    Increasing
    Clouds

  • Sunday

    Sunday: A 20 percent chance of rain. Mostly cloudy, with a high near 49. North wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 49 °F

    Slight Chance
    Rain

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 27. North wind 5 to 15 mph.

    Low: 27 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 47. North wind around 5 mph.

    High: 47 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 31. East wind around 5 mph becoming south after midnight.

    Low: 31 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 56. South wind 5 to 10 mph becoming west in the afternoon.

    High: 56 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 33.

    Low: 33 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 39. North wind 5 to 10 mph becoming light and variable in the evening.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 68. Southeast wind 5 to 15 mph becoming southwest in the afternoon.
Saturday Night
Increasing clouds, with a low around 48. Southwest wind 5 to 10 mph becoming north after midnight.
Sunday
A 20 percent chance of rain. Mostly cloudy, with a high near 49. North wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Mostly cloudy, with a low around 27. North wind 5 to 15 mph.
Monday
Mostly sunny, with a high near 47. North wind around 5 mph.
Monday Night
Increasing clouds, with a low around 31. East wind around 5 mph becoming south after midnight.
Tuesday
Mostly cloudy, with a high near 56. South wind 5 to 10 mph becoming west in the afternoon.
Tuesday Night
Partly cloudy, with a low around 33.
Wednesday
Partly sunny, with a high near 50.
Wednesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 40.
Thursday
A 30 percent chance of rain. Mostly cloudy, with a high near 62.
Thursday Night
Mostly cloudy, with a low around 27.
Friday
Partly sunny, with a high near 42.
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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:
2:27 pm CDT Mar 20, 2026
Forecast Valid:
3pm CDT Mar 20, 2026-6pm CDT Mar 27, 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