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

61°F

16°C

Humidity 83%
Wind Speed Calm
Barometer 30.10 in
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 4 Oct 3:50 am CDT
Extended Forecast for

South Beloit IL

  • Today

    Today: Sunny, with a high near 90. South southwest wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 90 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 62. South wind around 10 mph.

    Low: 62 °F

    Mostly Clear

  • Sunday

    Sunday: Patchy blowing dust after noon. Sunny, with a high near 84. Breezy, with a south southwest wind 10 to 15 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 84 °F

    Sunny then
    Patchy
    Blowing Dust
    and Breezy

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 62. South wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 62 °F

    Mostly Clear

  • Monday

    Monday: A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 76. Southwest wind 5 to 10 mph becoming northwest in the afternoon. Chance of precipitation is 50%.

    High: 76 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm before 7pm, then showers between 7pm and 1am, then showers and possibly a thunderstorm after 1am. Low around 51. Chance of precipitation is 80%.

    Low: 51 °F

    Showers

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms, mainly before 7am. Mostly sunny, with a high near 65.

    High: 65 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 90. South southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Tonight
Mostly clear, with a low around 62. South wind around 10 mph.
Sunday
Patchy blowing dust after noon. Sunny, with a high near 84. Breezy, with a south southwest wind 10 to 15 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.
Sunday Night
Mostly clear, with a low around 62. South wind 10 to 15 mph, with gusts as high as 20 mph.
Monday
A chance of showers, with thunderstorms also possible after 4pm. Partly sunny, with a high near 76. Southwest wind 5 to 10 mph becoming northwest in the afternoon. Chance of precipitation is 50%.
Monday Night
Showers and possibly a thunderstorm before 7pm, then showers between 7pm and 1am, then showers and possibly a thunderstorm after 1am. Low around 51. Chance of precipitation is 80%.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly before 7am. Mostly sunny, with a high near 65.
Tuesday Night
Mostly clear, with a low around 40.
Wednesday
Sunny, with a high near 65.
Wednesday Night
Mostly clear, with a low around 40.
Thursday
Sunny, with a high near 67.
Thursday Night
Partly cloudy, with a low around 45.
Friday
Mostly sunny, with a high near 70.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.5°N 89.05°W
Last Update:
4:11 am CDT Oct 4, 2025
Forecast Valid:
4am CDT Oct 4, 2025-6pm CDT Oct 10, 2025
 
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