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

27°F

-3°C

Humidity 86%
Wind Speed SW 9 mph
Barometer 30.28 in
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Wind Chill18°F (-8°C)
Last update 11 Jan 9:30 pm CST
Extended Forecast for

South Beloit IL

  • Tonight

    Tonight: Partly cloudy, with a low around 24. Southwest wind around 15 mph, with gusts as high as 30 mph.

    Low: 24 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 41. West southwest wind around 10 mph, with gusts as high as 20 mph.

    High: 41 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 31. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 31 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: A 30 percent chance of rain, mainly after noon. Partly sunny, with a high near 47. West southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 47 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: A chance of rain after midnight, mixing with snow after 3am. Mostly cloudy, with a low around 26. West wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    Low: 26 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

  • Wednesday

    Wednesday: A 50 percent chance of snow. Mostly cloudy, with a high near 32. Breezy.

    High: 32 °F

    Chance Snow
    and Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 12.

    Low: 12 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 25.

    High: 25 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of snow. Mostly cloudy, with a low around 20.

    Low: 20 °F

    Chance Snow

Detailed Forecast

Tonight
Partly cloudy, with a low around 24. Southwest wind around 15 mph, with gusts as high as 30 mph.
Monday
Mostly sunny, with a high near 41. West southwest wind around 10 mph, with gusts as high as 20 mph.
Monday Night
Increasing clouds, with a low around 31. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday
A 30 percent chance of rain, mainly after noon. Partly sunny, with a high near 47. West southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
A chance of rain after midnight, mixing with snow after 3am. Mostly cloudy, with a low around 26. West wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Wednesday
A 50 percent chance of snow. Mostly cloudy, with a high near 32. Breezy.
Wednesday Night
Mostly cloudy, with a low around 12.
Thursday
Mostly sunny, with a high near 25.
Thursday Night
A chance of snow. Mostly cloudy, with a low around 20.
Friday
A chance of snow. Mostly cloudy, with a high near 32.
Friday Night
A chance of snow. Mostly cloudy, with a low around 14.
Saturday
Mostly cloudy, with a high near 21.
Saturday Night
Partly cloudy, with a low around 8.
Sunday
Partly sunny, with a high near 21.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.47°N 89.02°W
Last Update:
9:41 pm CST Jan 11, 2026
Forecast Valid:
9pm CST Jan 11, 2026-6pm CST Jan 18, 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