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

54°F

12°C

Humidity 35%
Wind Speed W 18 G 29 mph
Barometer 30.14 in
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill49°F (9°C)
Last update 5 Apr 5:45 pm CDT
Extended Forecast for

South Beloit IL

  • Tonight

    Tonight: Showers likely, mainly before midnight. Mostly cloudy, with a low around 34. West wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 34 °F

    Showers
    Likely then
    Isolated
    Showers

  • Monday

    Monday: Partly sunny, with a high near 46. Northwest wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 46 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 22. North wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 22 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 42. Northeast wind around 5 mph becoming southeast in the afternoon. Winds could gust as high as 10 mph.

    High: 42 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of snow showers before 1am, then a chance of rain and snow showers between 1am and 4am, then a chance of rain showers after 4am. Mostly cloudy, with a low around 31. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    Low: 31 °F

    Slight Chance
    Snow Showers
    then Chance
    Rain/Snow

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 64. Breezy.

    High: 64 °F

    Mostly Cloudy
    then Partly
    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 52. Chance of precipitation is 70%.

    Low: 52 °F

    Showers
    Likely

  • Thursday

    Thursday: A chance of showers. Partly sunny, with a high near 64.

    High: 64 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers. Mostly cloudy, with a low around 41.

    Low: 41 °F

    Chance
    Showers

Detailed Forecast

Tonight
Showers likely, mainly before midnight. Mostly cloudy, with a low around 34. West wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Monday
Partly sunny, with a high near 46. Northwest wind 10 to 15 mph, with gusts as high as 30 mph.
Monday Night
Partly cloudy, with a low around 22. North wind 5 to 15 mph, with gusts as high as 20 mph.
Tuesday
Mostly sunny, with a high near 42. Northeast wind around 5 mph becoming southeast in the afternoon. Winds could gust as high as 10 mph.
Tuesday Night
A slight chance of snow showers before 1am, then a chance of rain and snow showers between 1am and 4am, then a chance of rain showers after 4am. Mostly cloudy, with a low around 31. Southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Wednesday
Mostly cloudy, with a high near 64. Breezy.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 52. Chance of precipitation is 70%.
Thursday
A chance of showers. Partly sunny, with a high near 64.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 41.
Friday
A chance of showers. Partly sunny, with a high near 59.
Friday Night
A chance of showers. Mostly cloudy, with a low around 40.
Saturday
A chance of showers. Partly sunny, with a high near 62.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 49.
Sunday
Showers likely. Mostly cloudy, with a high near 72.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.5°N 89.05°W
Last Update:
3:46 pm CDT Apr 5, 2026
Forecast Valid:
5pm CDT Apr 5, 2026-6pm CDT Apr 12, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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