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

79°F

26°C

Humidity 84%
Wind Speed Calm
Barometer 29.95 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 1 Sep 10:15 pm CDT
Extended Forecast for

Beloit WI

  • Tonight

    Tonight: Partly cloudy, with a low around 73. Calm wind becoming south around 5 mph.

    Low: 73 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny and hot, with a high near 92. Heat index values as high as 99. Southwest wind 5 to 10 mph.

    High: 92 °F

    Hot

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms after 4am. Mostly clear, with a low around 73. Southwest wind around 5 mph becoming calm in the evening.

    Low: 73 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms before 1pm. Sunny through mid morning, then becoming partly sunny, with a high near 89. Heat index values as high as 97. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 89 °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 88. Calm wind becoming south around 5 mph in the morning. Chance of precipitation is 50%.

    High: 88 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 68. Calm wind.

    Low: 68 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86. Calm wind becoming east around 5 mph in the afternoon.

    High: 86 °F

    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

Detailed Forecast

Tonight
Partly cloudy, with a low around 73. Calm wind becoming south around 5 mph.
Wednesday
Mostly sunny and hot, with a high near 92. Heat index values as high as 99. Southwest wind 5 to 10 mph.
Wednesday Night
A 20 percent chance of showers and thunderstorms after 4am. Mostly clear, with a low around 73. Southwest wind around 5 mph becoming calm in the evening.
Thursday
A 30 percent chance of showers and thunderstorms before 1pm. Sunny through mid morning, then becoming partly sunny, with a high near 89. Heat index values as high as 97. Calm wind becoming southwest around 5 mph in the afternoon.
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 88. Calm wind becoming south around 5 mph in the morning. Chance of precipitation is 50%.
Friday Night
A 40 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 68. Calm wind.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86. Calm wind becoming east around 5 mph in the afternoon.
Saturday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 66.
Sunday
A 30 percent chance of showers. Partly sunny, with a high near 83.
Sunday Night
A 20 percent chance of showers. Mostly 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 20 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:
Beloit WI
 42.52°N 89.05°W (Elev. 751 ft)
Last Update:
8:42 pm CDT Sep 1, 2026
Forecast Valid:
10pm 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