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

63°F

17°C

Humidity 100%
Wind Speed Calm
Barometer 30.07 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 27 Aug 11:55 pm CDT
Extended Forecast for

Janesville WI

  • Overnight

    Overnight: Patchy fog after 5am. Otherwise, mostly clear, with a low around 57. Calm wind.

    Low: 57 °F

    Patchy Fog

  • Friday

    Friday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 81. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 81 °F

    Patchy Fog
    then Mostly
    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 59. Southwest wind around 5 mph becoming calm.

    Low: 59 °F

    Partly Cloudy

  • Saturday

    Saturday: A 50 percent chance of showers, mainly after 2pm. Increasing clouds, with a high near 77. South wind 5 to 10 mph.

    High: 77 °F

    Partly Sunny
    then Chance
    Showers

  • Saturday Night

    Saturday Night: A chance of showers, with thunderstorms also possible after 4am. Mostly cloudy, with a low around 66. South wind around 10 mph. Chance of precipitation is 50%.

    Low: 66 °F

    Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers and thunderstorms before 7am, then a slight chance of showers between 7am and 4pm, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 84. South wind 10 to 15 mph. Chance of precipitation is 20%.

    High: 84 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69. South wind around 10 mph.

    Low: 69 °F

    Chance
    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 87. Southwest wind around 10 mph.

    High: 87 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71.

    Low: 71 °F

    Mostly Cloudy
    then Chance
    T-storms

Detailed Forecast

Overnight
Patchy fog after 5am. Otherwise, mostly clear, with a low around 57. Calm wind.
Friday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 81. Calm wind becoming southwest around 5 mph in the afternoon.
Friday Night
Partly cloudy, with a low around 59. Southwest wind around 5 mph becoming calm.
Saturday
A 50 percent chance of showers, mainly after 2pm. Increasing clouds, with a high near 77. South wind 5 to 10 mph.
Saturday Night
A chance of showers, with thunderstorms also possible after 4am. Mostly cloudy, with a low around 66. South wind around 10 mph. Chance of precipitation is 50%.
Sunday
A slight chance of showers and thunderstorms before 7am, then a slight chance of showers between 7am and 4pm, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 84. South wind 10 to 15 mph. Chance of precipitation is 20%.
Sunday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69. South wind around 10 mph.
Monday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 87. Southwest wind around 10 mph.
Monday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 86.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Janesville WI
 42.69°N 89.01°W (Elev. 863 ft)
Last Update:
11:01 pm CDT Aug 27, 2026
Forecast Valid:
12am CDT Aug 28, 2026-6pm CDT Sep 3, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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