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.

Fog/Mist

61°F

16°C

Humidity 100%
Wind Speed Calm
Barometer 30.11 in
Dewpoint 61°F (16°C)
Visibility 4.00 mi
Last update 28 Aug 10:55 pm CDT
Extended Forecast for

Beloit WI

  • Tonight

    Tonight: Partly cloudy, with a low around 61. Calm wind becoming south around 5 mph.

    Low: 61 °F

    Partly Cloudy

  • Saturday

    Saturday: A 30 percent chance of showers after 2pm. Mostly cloudy, with a high near 78. South wind 5 to 10 mph.

    High: 78 °F

    Mostly Cloudy
    then Chance
    Showers

  • Saturday Night

    Saturday Night: A slight chance of showers, then a chance of showers and thunderstorms after 10pm. Mostly cloudy, with a low around 67. South wind around 10 mph. Chance of precipitation is 40%.

    Low: 67 °F

    Chance
    T-storms

  • Sunday

    Sunday: A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm. Partly sunny, with a high near 86. Southwest wind 10 to 15 mph. Chance of precipitation is 40%.

    High: 86 °F

    Chance
    T-storms then
    Chance
    Showers

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 71. South wind around 5 mph.

    Low: 71 °F

    Mostly Cloudy
    then Chance
    Showers

  • Monday

    Monday: Partly sunny, with a high near 89. South wind 5 to 10 mph.

    High: 89 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 72. South wind around 5 mph.

    Low: 72 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 89. Southwest wind 5 to 10 mph.

    High: 89 °F

    Slight Chance
    T-storms

  • Tuesday Night

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

    Low: 71 °F

    Chance
    T-storms

Detailed Forecast

Tonight
Partly cloudy, with a low around 61. Calm wind becoming south around 5 mph.
Saturday
A 30 percent chance of showers after 2pm. Mostly cloudy, with a high near 78. South wind 5 to 10 mph.
Saturday Night
A slight chance of showers, then a chance of showers and thunderstorms after 10pm. Mostly cloudy, with a low around 67. South wind around 10 mph. Chance of precipitation is 40%.
Sunday
A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm. Partly sunny, with a high near 86. Southwest wind 10 to 15 mph. Chance of precipitation is 40%.
Sunday Night
A 30 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 71. South wind around 5 mph.
Monday
Partly sunny, with a high near 89. South wind 5 to 10 mph.
Monday Night
Mostly cloudy, with a low around 72. South wind around 5 mph.
Tuesday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 89. Southwest wind 5 to 10 mph.
Tuesday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 71.
Wednesday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 89.
Wednesday Night
A 20 percent chance of showers. Partly cloudy, with a low around 68.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Thursday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Friday
A 20 percent chance of showers. Mostly sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Beloit WI
 42.52°N 89.02°W (Elev. 745 ft)
Last Update:
10:32 pm CDT Aug 28, 2026
Forecast Valid:
11pm CDT Aug 28, 2026-6pm CDT Sep 4, 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