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.

Mostly Cloudy

64°F

18°C

Humidity 88%
Wind Speed NE 5 mph
Barometer 30.02 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 25 Jun 10:10 pm CDT
Extended Forecast for

Janesville WI

  • Tonight

    Tonight: Mostly cloudy, with a low around 57. East wind around 5 mph becoming calm.

    Low: 57 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 71. East wind 5 to 10 mph.

    High: 71 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 55. Northeast wind 5 to 10 mph.

    Low: 55 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 78. Northeast wind 5 to 10 mph becoming east in the afternoon.

    High: 78 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers after 1am. Partly cloudy, with a low around 60. East wind 5 to 10 mph.

    Low: 60 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: A 20 percent chance of showers before 1pm. Partly sunny, with a high near 86. Southeast wind 5 to 15 mph.

    High: 86 °F

    Slight Chance
    Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 72. Southeast wind 10 to 15 mph.

    Low: 72 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny and hot, with a high near 92. South wind 10 to 15 mph.

    High: 92 °F

    Hot

  • Monday Night

    Monday Night: Partly cloudy, with a low around 75.

    Low: 75 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 57. East wind around 5 mph becoming calm.
Friday
Partly sunny, with a high near 71. East wind 5 to 10 mph.
Friday Night
Mostly clear, with a low around 55. Northeast wind 5 to 10 mph.
Saturday
Mostly sunny, with a high near 78. Northeast wind 5 to 10 mph becoming east in the afternoon.
Saturday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 60. East wind 5 to 10 mph.
Sunday
A 20 percent chance of showers before 1pm. Partly sunny, with a high near 86. Southeast wind 5 to 15 mph.
Sunday Night
Partly cloudy, with a low around 72. Southeast wind 10 to 15 mph.
Monday
Mostly sunny and hot, with a high near 92. South wind 10 to 15 mph.
Monday Night
Partly cloudy, with a low around 75.
Tuesday
Sunny and hot, with a high near 94.
Tuesday Night
A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 74.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 95.
Wednesday Night
Mostly clear, with a low around 73.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 93.
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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:
9:47 pm CDT Jun 25, 2026
Forecast Valid:
10pm CDT Jun 25, 2026-6pm CDT Jul 2, 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