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

75°F

24°C

Humidity 54%
Wind Speed W 8 mph
Barometer 29.96 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 25 Jun 3:45 pm CDT
Extended Forecast for

South Beloit IL

  • Tonight

    Tonight: Partly cloudy, with a low around 57. North wind around 5 mph becoming calm in the evening. Winds could gust as high as 10 mph.

    Low: 57 °F

    Partly Cloudy

  • Friday

    Friday: A slight chance of showers between 1pm and 2pm. Partly sunny, with a high near 72. East wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    High: 72 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Mostly clear, with a low around 55. Northeast wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 55 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 78. Northeast wind 5 to 10 mph becoming east southeast in the afternoon. Winds could gust as high as 15 mph.

    High: 78 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 60. East southeast wind 5 to 10 mph.

    Low: 60 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: Partly sunny, with a high near 84.

    High: 84 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 73.

    Low: 73 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 92.

    High: 92 °F

    Mostly Sunny

  • Monday Night

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

    Low: 75 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 57. North wind around 5 mph becoming calm in the evening. Winds could gust as high as 10 mph.
Friday
A slight chance of showers between 1pm and 2pm. Partly sunny, with a high near 72. East wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Friday Night
Mostly clear, with a low around 55. Northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Saturday
Mostly sunny, with a high near 78. Northeast wind 5 to 10 mph becoming east southeast in the afternoon. Winds could gust as high as 15 mph.
Saturday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 60. East southeast wind 5 to 10 mph.
Sunday
Partly sunny, with a high near 84.
Sunday Night
Partly cloudy, with a low around 73.
Monday
Mostly sunny, with a high near 92.
Monday Night
Partly cloudy, with a low around 75.
Tuesday
Sunny, with a high near 93.
Tuesday Night
Mostly clear, with a low around 74.
Wednesday
Mostly sunny, with a high near 94.
Wednesday Night
Mostly clear, with a low around 73.
Thursday
Mostly sunny, with a high near 93.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.5°N 89.05°W
Last Update:
1:21 pm CDT Jun 25, 2026
Forecast Valid:
4pm 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