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

30°F

-1°C

Humidity 75%
Wind Speed W 7 mph
Barometer 30.15 in
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Wind Chill23°F (-5°C)
Last update 11 Mar 10:55 pm CDT
Extended Forecast for

South Beloit IL

  • Tonight

    Tonight: Mostly clear, with a low around 26. West wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 26 °F

    Mostly Clear

  • Thursday

    Thursday: Increasing clouds, with a high near 45. West wind 5 to 15 mph becoming south southwest in the afternoon. Winds could gust as high as 20 mph.

    High: 45 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: Showers likely. Mostly cloudy, with a low around 35. Windy, with a south wind 15 to 20 mph increasing to 25 to 30 mph after midnight. Winds could gust as high as 45 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 35 °F

    Showers
    Likely and
    Windy

  • Friday

    Friday: Partly sunny, with a high near 43. Very windy, with a west northwest wind 30 to 35 mph, with gusts as high as 50 mph.

    High: 43 °F

    Partly Sunny
    and Very
    Windy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 26. West northwest wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 25 mph.

    Low: 26 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 20 percent chance of snow after 1pm. Mostly cloudy, with a high near 41.

    High: 41 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Saturday Night

    Saturday Night: A chance of snow showers before 1am, then rain and snow showers. Low around 30. Chance of precipitation is 80%.

    Low: 30 °F

    Chance Snow
    Showers then
    Rain/Snow

  • Sunday

    Sunday: Rain and snow showers. Cloudy, with a high near 40. Breezy.

    High: 40 °F

    Rain/Snow and
    Breezy

  • Sunday Night

    Sunday Night: Rain and snow showers likely before 1am, then a chance of snow showers. Cloudy, with a low around 15. Blustery.

    Low: 15 °F

    Rain/Snow
    Likely and
    Blustery

Detailed Forecast

Tonight
Mostly clear, with a low around 26. West wind 5 to 10 mph, with gusts as high as 15 mph.
Thursday
Increasing clouds, with a high near 45. West wind 5 to 15 mph becoming south southwest in the afternoon. Winds could gust as high as 20 mph.
Thursday Night
Showers likely. Mostly cloudy, with a low around 35. Windy, with a south wind 15 to 20 mph increasing to 25 to 30 mph after midnight. Winds could gust as high as 45 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Partly sunny, with a high near 43. Very windy, with a west northwest wind 30 to 35 mph, with gusts as high as 50 mph.
Friday Night
Mostly cloudy, with a low around 26. West northwest wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 25 mph.
Saturday
A 20 percent chance of snow after 1pm. Mostly cloudy, with a high near 41.
Saturday Night
A chance of snow showers before 1am, then rain and snow showers. Low around 30. Chance of precipitation is 80%.
Sunday
Rain and snow showers. Cloudy, with a high near 40. Breezy.
Sunday Night
Rain and snow showers likely before 1am, then a chance of snow showers. Cloudy, with a low around 15. Blustery.
Monday
Mostly cloudy, with a high near 23. Blustery.
Monday Night
Mostly cloudy, with a low around 1.
Tuesday
Sunny, with a high near 26.
Tuesday Night
Mostly cloudy, with a low around 16.
Wednesday
Mostly cloudy, with a high near 38.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.5°N 89.05°W
Last Update:
9:51 pm CDT Mar 11, 2026
Forecast Valid:
11pm CDT Mar 11, 2026-6pm CDT Mar 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