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

41°F

5°C

Humidity 61%
Wind Speed S 8 mph
Barometer 30.24 in
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 29 Mar 2:50 am CDT
Extended Forecast for

South Beloit IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 37. South wind around 10 mph, with gusts as high as 15 mph.

    Low: 37 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 64. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 64 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 45. South wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 45 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 76. South southwest wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 76 °F

    Sunny

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 59. South southwest wind 10 to 15 mph. Chance of precipitation is 50%.

    Low: 59 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 73. Breezy. Chance of precipitation is 70%.

    High: 73 °F

    Breezy.
    Chance
    Showers then
    Showers
    Likely

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 34. Chance of precipitation is 40%.

    Low: 34 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Partly sunny, with a high near 46.

    High: 46 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A chance of rain and snow showers before 1am, then a chance of rain showers. Mostly cloudy, with a low around 30.

    Low: 30 °F

    Chance
    Rain/Snow

Detailed Forecast

Overnight
Mostly cloudy, with a low around 37. South wind around 10 mph, with gusts as high as 15 mph.
Sunday
Partly sunny, with a high near 64. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Mostly clear, with a low around 45. South wind 5 to 10 mph, with gusts as high as 15 mph.
Monday
Sunny, with a high near 76. South southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 59. South southwest wind 10 to 15 mph. Chance of precipitation is 50%.
Tuesday
A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 73. Breezy. Chance of precipitation is 70%.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 34. Chance of precipitation is 40%.
Wednesday
Partly sunny, with a high near 46.
Wednesday Night
A chance of rain and snow showers before 1am, then a chance of rain showers. Mostly cloudy, with a low around 30.
Thursday
A chance of rain and snow showers. Mostly cloudy, with a high near 42.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 34.
Friday
Mostly cloudy, with a high near 54.
Friday Night
A chance of showers. Mostly cloudy, with a low around 41.
Saturday
Showers likely. Mostly cloudy, with a high near 59.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.5°N 89.05°W
Last Update:
1:21 am CDT Mar 29, 2026
Forecast Valid:
3am CDT Mar 29, 2026-6pm CDT Apr 4, 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