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.

Fair

30°F

-1°C

Humidity 86%
Wind Speed NE 3 mph
Barometer 30.31 in
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Last update 24 Dec 2:10 am CST
Extended Forecast for

Janesville WI

  • Overnight

    Overnight: Mostly cloudy, with a low around 26. Northeast wind around 5 mph.

    Low: 26 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Patchy drizzle after 3pm. Mostly cloudy, with a high near 42. Southeast wind 5 to 10 mph.

    High: 42 °F

    Mostly Cloudy
    then Patchy
    Drizzle

  • Wednesday Night

    Wednesday Night: Areas of drizzle before midnight. Cloudy, with a low around 33. Calm wind becoming north around 5 mph after midnight.

    Low: 33 °F

    Areas Drizzle
    then Cloudy

  • Christmas Day

    Christmas Day: Mostly cloudy, with a high near 38. East wind 5 to 10 mph.

    High: 38 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Rain after midnight. Low around 33. Southeast wind 5 to 10 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 33 °F

    Cloudy then
    Rain

  • Friday

    Friday: A 40 percent chance of rain before noon. Cloudy, with a high near 45. Southeast wind around 5 mph becoming northwest in the afternoon.

    High: 45 °F

    Chance Rain
    then Mostly
    Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 33. Northwest wind around 5 mph becoming calm in the evening.

    Low: 33 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 46. Calm wind becoming southeast around 5 mph in the morning.

    High: 46 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 20 percent chance of rain. Mostly cloudy, with a low around 27.

    Low: 27 °F

    Slight Chance
    Rain

Detailed Forecast

Overnight
Mostly cloudy, with a low around 26. Northeast wind around 5 mph.
Wednesday
Patchy drizzle after 3pm. Mostly cloudy, with a high near 42. Southeast wind 5 to 10 mph.
Wednesday Night
Areas of drizzle before midnight. Cloudy, with a low around 33. Calm wind becoming north around 5 mph after midnight.
Christmas Day
Mostly cloudy, with a high near 38. East wind 5 to 10 mph.
Thursday Night
Rain after midnight. Low around 33. Southeast wind 5 to 10 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Friday
A 40 percent chance of rain before noon. Cloudy, with a high near 45. Southeast wind around 5 mph becoming northwest in the afternoon.
Friday Night
Mostly cloudy, with a low around 33. Northwest wind around 5 mph becoming calm in the evening.
Saturday
Mostly cloudy, with a high near 46. Calm wind becoming southeast around 5 mph in the morning.
Saturday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 27.
Sunday
A 20 percent chance of snow after noon. Partly sunny, with a temperature falling to around 22 by 5pm. Breezy.
Sunday Night
Mostly cloudy, with a low around 7. Blustery.
Monday
Mostly sunny, with a high near 17. Blustery.
Monday Night
Mostly clear, with a low around 8.
Tuesday
Partly sunny, with a high near 23.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Janesville WI
 42.69°N 89.01°W (Elev. 863 ft)
Last Update:
2:21 am CST Dec 24, 2025
Forecast Valid:
2am CST Dec 24, 2025-6pm CST Dec 30, 2025
 
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