National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Overcast

63°F

17°C

Humidity 73%
Wind Speed W 15 mph
Barometer 30.02 in
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 19 May 5:45 pm CDT
Extended Forecast for

South Beloit IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 45. Northwest wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 45 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 63. North wind 10 to 15 mph.

    High: 63 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 41. East northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 41 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 62. East wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 62 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 45. East wind around 10 mph, with gusts as high as 20 mph.

    Low: 45 °F

    Mostly Cloudy

  • Friday

    Friday: A 50 percent chance of showers. Mostly cloudy, with a high near 62.

    High: 62 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 48. Chance of precipitation is 70%.

    Low: 48 °F

    Showers
    Likely

  • Saturday

    Saturday: Mostly cloudy, with a high near 71.

    High: 71 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 45. Northwest wind 10 to 15 mph, with gusts as high as 20 mph.
Wednesday
Mostly sunny, with a high near 63. North wind 10 to 15 mph.
Wednesday Night
Partly cloudy, with a low around 41. East northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Thursday
Partly sunny, with a high near 62. East wind 10 to 15 mph, with gusts as high as 20 mph.
Thursday Night
Mostly cloudy, with a low around 45. East wind around 10 mph, with gusts as high as 20 mph.
Friday
A 50 percent chance of showers. Mostly cloudy, with a high near 62.
Friday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 48. Chance of precipitation is 70%.
Saturday
Mostly cloudy, with a high near 71.
Saturday Night
Mostly cloudy, with a low around 51.
Sunday
Partly sunny, with a high near 77.
Sunday Night
Partly cloudy, with a low around 52.
Memorial Day
Mostly sunny, with a high near 81.
Monday Night
Partly cloudy, with a low around 57.
Tuesday
Partly sunny, with a high near 81.
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:
2:57 pm CDT May 19, 2026
Forecast Valid:
6pm CDT May 19, 2026-6pm CDT May 26, 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