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.

Partly Cloudy

81°F

27°C

Humidity 45%
Wind Speed W 6 mph
Barometer 30.12 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 28 Aug 2:45 pm CDT
Extended Forecast for

South Beloit IL

  • Tonight

    Tonight: Partly cloudy, with a low around 60. Southwest wind around 5 mph becoming calm in the evening.

    Low: 60 °F

    Partly Cloudy

  • Saturday

    Saturday: A 30 percent chance of showers after 4pm. Mostly cloudy, with a high near 77. South wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 77 °F

    Mostly Cloudy
    then Chance
    Showers

  • Saturday Night

    Saturday Night: A 30 percent chance of showers, mainly between 2am and 5am. Mostly cloudy, with a low around 67. South southeast wind around 10 mph, with gusts as high as 15 mph.

    Low: 67 °F

    Chance
    Showers

  • Sunday

    Sunday: A slight chance of showers between 7am and 1pm. Partly sunny, with a high near 87. South southwest wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    High: 87 °F

    Slight Chance
    Showers

  • Sunday Night

    Sunday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 70. South wind around 10 mph.

    Low: 70 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Monday

    Monday: Partly sunny, with a high near 89.

    High: 89 °F

    Partly Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 72.

    Low: 72 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Tuesday

    Tuesday: Partly sunny, with a high near 88.

    High: 88 °F

    Partly Sunny

  • Tuesday Night

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

    Low: 71 °F

    Mostly Cloudy
    then Chance
    T-storms

Detailed Forecast

Tonight
Partly cloudy, with a low around 60. Southwest wind around 5 mph becoming calm in the evening.
Saturday
A 30 percent chance of showers after 4pm. Mostly cloudy, with a high near 77. South wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday Night
A 30 percent chance of showers, mainly between 2am and 5am. Mostly cloudy, with a low around 67. South southeast wind around 10 mph, with gusts as high as 15 mph.
Sunday
A slight chance of showers between 7am and 1pm. Partly sunny, with a high near 87. South southwest wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Sunday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 70. South wind around 10 mph.
Monday
Partly sunny, with a high near 89.
Monday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 72.
Tuesday
Partly sunny, with a high near 88.
Tuesday Night
A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 71.
Wednesday
Mostly sunny, with a high near 88.
Wednesday Night
Partly cloudy, with a low around 68.
Thursday
Mostly sunny, with a high near 87.
Thursday Night
A chance of showers. Partly cloudy, with a low around 67.
Friday
Mostly sunny, with a high near 86.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.47°N 89.02°W
Last Update:
3:46 pm CDT Aug 28, 2026
Forecast Valid:
4pm 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