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.

Fair

37°F

3°C

Humidity 65%
Wind Speed SW 7 mph
Barometer 30.00 in
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 18 Mar 5:45 pm CDT
Extended Forecast for

Janesville WI

  • Tonight

    Tonight: A slight chance of freezing rain between 1am and 2am, then a chance of rain. Increasing clouds, with a low around 31. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.

    Low: 31 °F

    Mostly Cloudy
    then Chance
    Rain/Freezing
    Rain

  • Thursday

    Thursday: A 30 percent chance of rain, mainly before 7am. Patchy fog before 10am. Otherwise, partly sunny, with a high near 47. Calm wind becoming east around 5 mph in the afternoon.

    High: 47 °F

    Chance Rain
    and Patchy
    Fog then
    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 36. Calm wind becoming south around 5 mph after midnight.

    Low: 36 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 59. Southwest wind 5 to 10 mph becoming northwest in the afternoon.

    High: 59 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 38. Northwest wind around 5 mph becoming calm in the evening.

    Low: 38 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 67. Southwest wind 5 to 10 mph.

    High: 67 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 40. Southwest wind around 10 mph becoming northeast after midnight.

    Low: 40 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 51. North wind 10 to 15 mph.

    High: 51 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A slight chance of freezing rain between 1am and 2am, then a chance of rain. Increasing clouds, with a low around 31. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Thursday
A 30 percent chance of rain, mainly before 7am. Patchy fog before 10am. Otherwise, partly sunny, with a high near 47. Calm wind becoming east around 5 mph in the afternoon.
Thursday Night
Mostly cloudy, with a low around 36. Calm wind becoming south around 5 mph after midnight.
Friday
Mostly cloudy, with a high near 59. Southwest wind 5 to 10 mph becoming northwest in the afternoon.
Friday Night
Mostly cloudy, with a low around 38. Northwest wind around 5 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 67. Southwest wind 5 to 10 mph.
Saturday Night
Mostly cloudy, with a low around 40. Southwest wind around 10 mph becoming northeast after midnight.
Sunday
Mostly cloudy, with a high near 51. North wind 10 to 15 mph.
Sunday Night
Mostly cloudy, with a low around 26.
Monday
Mostly sunny, with a high near 44.
Monday Night
Partly cloudy, with a low around 28.
Tuesday
Mostly cloudy, with a high near 51.
Tuesday Night
Mostly cloudy, with a low around 33.
Wednesday
Mostly cloudy, with a high near 55.
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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:
4:34 pm CDT Mar 18, 2026
Forecast Valid:
5pm CDT Mar 18, 2026-6pm CDT Mar 25, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation