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.

Fair

88°F

31°C

Humidity 25%
Wind Speed S 12 mph
Barometer 29.96 in
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 26 May 4:45 pm CDT
Extended Forecast for

South Beloit IL

  • Tonight

    Tonight: Partly cloudy, with a low around 61. South wind around 5 mph becoming calm in the evening.

    Low: 61 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms between 3pm and 5pm. Mostly sunny, with a high near 85. Light northeast wind becoming north northeast 5 to 10 mph in the afternoon. Chance of precipitation is 20%.

    High: 85 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms before 11pm. Partly cloudy, with a low around 54. Northeast wind around 10 mph, with gusts as high as 25 mph.

    Low: 54 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 75. East northeast wind around 10 mph, with gusts as high as 20 mph.

    High: 75 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 48. East wind 5 to 10 mph becoming light after midnight.

    Low: 48 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 55.

    Low: 55 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 53.

    Low: 53 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 61. South wind around 5 mph becoming calm in the evening.
Wednesday
A slight chance of showers and thunderstorms between 3pm and 5pm. Mostly sunny, with a high near 85. Light northeast wind becoming north northeast 5 to 10 mph in the afternoon. Chance of precipitation is 20%.
Wednesday Night
A 20 percent chance of showers and thunderstorms before 11pm. Partly cloudy, with a low around 54. Northeast wind around 10 mph, with gusts as high as 25 mph.
Thursday
Sunny, with a high near 75. East northeast wind around 10 mph, with gusts as high as 20 mph.
Thursday Night
Clear, with a low around 48. East wind 5 to 10 mph becoming light after midnight.
Friday
Sunny, with a high near 82.
Friday Night
Mostly clear, with a low around 55.
Saturday
Sunny, with a high near 82.
Saturday Night
Mostly clear, with a low around 53.
Sunday
Sunny, with a high near 80.
Sunday Night
Mostly clear, with a low around 52.
Monday
Sunny, with a high near 80.
Monday Night
Mostly clear, with a low around 52.
Tuesday
Sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.5°N 89.05°W
Last Update:
2:46 pm CDT May 26, 2026
Forecast Valid:
4pm CDT May 26, 2026-6pm CDT Jun 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