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.

Mostly Cloudy

91°F

33°C

Humidity 63%
Wind Speed SW 12 mph
Barometer 29.94 in
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index104°F (40°C)
Last update 1 Sep 3:45 pm CDT
Extended Forecast for

2 Miles WSW Janesville WI

  • This Afternoon

    This Afternoon: Scattered showers and thunderstorms. Partly sunny, with a high near 88. Heat index values as high as 99. Southwest wind around 5 mph. Chance of precipitation is 40%.

    High: 88 °F

    Scattered
    Showers

  • Tonight

    Tonight: Scattered showers and thunderstorms, mainly before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 73. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.

    Low: 73 °F

    Scattered
    Showers then
    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny and hot, with a high near 91. Heat index values as high as 98. Light southwest wind increasing to 5 to 10 mph in the morning.

    High: 91 °F

    Hot

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms after 3am. Mostly clear, with a low around 72. Southwest wind around 5 mph becoming calm in the evening.

    Low: 72 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 88. Calm wind becoming southwest around 5 mph in the morning.

    High: 88 °F

    Chance
    T-storms then
    Chance
    Showers

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 70. South wind around 5 mph becoming calm in the evening.

    Low: 70 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Friday

    Friday: A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm. Partly sunny, with a high near 87. Southeast wind around 5 mph becoming southwest in the afternoon. Chance of precipitation is 50%.

    High: 87 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 67. Calm wind.

    Low: 67 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 86.

    High: 86 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
Scattered showers and thunderstorms. Partly sunny, with a high near 88. Heat index values as high as 99. Southwest wind around 5 mph. Chance of precipitation is 40%.
Tonight
Scattered showers and thunderstorms, mainly before 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 73. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Wednesday
Mostly sunny and hot, with a high near 91. Heat index values as high as 98. Light southwest wind increasing to 5 to 10 mph in the morning.
Wednesday Night
A 20 percent chance of showers and thunderstorms after 3am. Mostly clear, with a low around 72. Southwest wind around 5 mph becoming calm in the evening.
Thursday
A 40 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 88. Calm wind becoming southwest around 5 mph in the morning.
Thursday Night
A 50 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 70. South wind around 5 mph becoming calm in the evening.
Friday
A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm. Partly sunny, with a high near 87. Southeast wind around 5 mph becoming southwest in the afternoon. Chance of precipitation is 50%.
Friday Night
A 50 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 67. Calm wind.
Saturday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 86.
Saturday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 65.
Sunday
A 40 percent chance of showers. Partly sunny, with a high near 82.
Sunday Night
A 20 percent chance of showers. Partly cloudy, with a low around 63.
Labor Day
A 20 percent chance of showers. Partly sunny, with a high near 79.
Monday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 59.
Tuesday
A 30 percent chance of showers. Partly sunny, with a high near 78.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WSW Janesville WI
 42.67°N 89.07°W (Elev. 843 ft)
Last Update:
3:52 pm CDT Sep 1, 2026
Forecast Valid:
4pm CDT Sep 1, 2026-6pm CDT Sep 8, 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