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

52°F

11°C

Humidity 72%
Wind Speed SE 8 mph
Barometer 30.01 in
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill49°F (9°C)
Last update 19 Mar 6:45 pm CDT
Extended Forecast for

South Beloit IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 38. East wind around 5 mph becoming south southwest after midnight. Winds could gust as high as 15 mph.

    Low: 38 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 57. West southwest wind 5 to 10 mph becoming north northwest in the afternoon. Winds could gust as high as 15 mph.

    High: 57 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 38. North wind around 5 mph becoming calm in the evening.

    Low: 38 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 65. South wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 65 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 48. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 48 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 59.

    High: 59 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 29.

    Low: 29 °F

    Mostly Cloudy

  • Monday

    Monday: Sunny, with a high near 46.

    High: 46 °F

    Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 32.

    Low: 32 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 38. East wind around 5 mph becoming south southwest after midnight. Winds could gust as high as 15 mph.
Friday
Partly sunny, with a high near 57. West southwest wind 5 to 10 mph becoming north northwest in the afternoon. Winds could gust as high as 15 mph.
Friday Night
Mostly cloudy, with a low around 38. North wind around 5 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 65. South wind 5 to 10 mph, with gusts as high as 15 mph.
Saturday Night
Partly cloudy, with a low around 48. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Sunday
Mostly cloudy, with a high near 59.
Sunday Night
Mostly cloudy, with a low around 29.
Monday
Sunny, with a high near 46.
Monday Night
Mostly cloudy, with a low around 32.
Tuesday
Mostly cloudy, with a high near 52.
Tuesday Night
Mostly cloudy, with a low around 34.
Wednesday
Mostly cloudy, with a high near 53.
Wednesday Night
Mostly cloudy, with a low around 40.
Thursday
A chance of showers. Partly sunny, with a high near 58.
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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 pm CDT Mar 19, 2026
Forecast Valid:
7pm CDT Mar 19, 2026-6pm CDT Mar 26, 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