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

10°F

-12°C

Humidity 61%
Wind Speed W 12 mph
Barometer 30.16 in
Dewpoint 0°F (-18°C)
Visibility 10.00 mi
Wind Chill-5°F (-21°C)
Last update 28 Jan 11:45 am CST
Extended Forecast for

Janesville WI

  • This Afternoon

    This Afternoon: Sunny, with a high near 15. Wind chill values between -5 and zero. Northwest wind 10 to 15 mph.

    High: 15 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around -5. Wind chill values between -10 and -15. Northwest wind 5 to 10 mph.

    Low: -5 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 12. Wind chill values between -10 and zero. Northwest wind around 5 mph.

    High: 12 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around -4. Wind chill values between -10 and -15. Calm wind becoming north around 5 mph after midnight.

    Low: -4 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 12. North wind 5 to 10 mph.

    High: 12 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 2. Northwest wind around 5 mph.

    Low: 2 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 19. North wind around 5 mph.

    High: 19 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 3. Northwest wind around 5 mph becoming calm.

    Low: 3 °F

    Mostly Clear

  • Sunday

    Sunday: A 30 percent chance of snow, mainly after noon. Mostly sunny, with a high near 24.

    High: 24 °F

    Chance Snow

Detailed Forecast

This Afternoon
Sunny, with a high near 15. Wind chill values between -5 and zero. Northwest wind 10 to 15 mph.
Tonight
Mostly clear, with a low around -5. Wind chill values between -10 and -15. Northwest wind 5 to 10 mph.
Thursday
Sunny, with a high near 12. Wind chill values between -10 and zero. Northwest wind around 5 mph.
Thursday Night
Partly cloudy, with a low around -4. Wind chill values between -10 and -15. Calm wind becoming north around 5 mph after midnight.
Friday
Mostly sunny, with a high near 12. North wind 5 to 10 mph.
Friday Night
Partly cloudy, with a low around 2. Northwest wind around 5 mph.
Saturday
Mostly sunny, with a high near 19. North wind around 5 mph.
Saturday Night
Mostly clear, with a low around 3. Northwest wind around 5 mph becoming calm.
Sunday
A 30 percent chance of snow, mainly after noon. Mostly sunny, with a high near 24.
Sunday Night
A 30 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 13.
Monday
Mostly cloudy, with a high near 26.
Monday Night
Mostly cloudy, with a low around 10.
Tuesday
A 20 percent chance of snow. Mostly cloudy, with a high near 27.
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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:
11:09 am CST Jan 28, 2026
Forecast Valid:
12pm CST Jan 28, 2026-6pm CST Feb 3, 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