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.

Mostly Cloudy

61°F

16°C

Humidity 31%
Wind Speed S 16 mph
Barometer 30.00 in
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Last update 29 Mar 5:45 pm CDT
Extended Forecast for

South Beloit IL

  • Tonight

    Tonight: Mostly clear, with a low around 45. South wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 45 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 75. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 75 °F

    Sunny

  • Monday Night

    Monday Night: A 50 percent chance of showers and thunderstorms after 10pm. Mostly cloudy, with a low around 61. South wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 61 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 74. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 80%.

    High: 74 °F

    Showers and
    Breezy

  • Tuesday Night

    Tuesday Night: Showers, mainly before 7pm. Low around 36. North wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.

    Low: 36 °F

    Showers then
    Chance
    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 44.

    High: 44 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Showers likely, mainly after 1am. Cloudy, with a low around 32. Breezy. Chance of precipitation is 70%.

    Low: 32 °F

    Showers
    Likely and
    Breezy

  • Thursday

    Thursday: Showers likely. Cloudy, with a high near 46. Breezy.

    High: 46 °F

    Showers
    Likely and
    Breezy

  • Thursday Night

    Thursday Night: A chance of showers. Mostly cloudy, with a low around 33.

    Low: 33 °F

    Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 45. South wind 5 to 15 mph, with gusts as high as 20 mph.
Monday
Sunny, with a high near 75. South southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Monday Night
A 50 percent chance of showers and thunderstorms after 10pm. Mostly cloudy, with a low around 61. South wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday
Showers and possibly a thunderstorm. High near 74. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 80%.
Tuesday Night
Showers, mainly before 7pm. Low around 36. North wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.
Wednesday
A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 44.
Wednesday Night
Showers likely, mainly after 1am. Cloudy, with a low around 32. Breezy. Chance of precipitation is 70%.
Thursday
Showers likely. Cloudy, with a high near 46. Breezy.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 33.
Friday
Mostly cloudy, with a high near 52.
Friday Night
A chance of showers. Mostly cloudy, with a low around 39.
Saturday
Showers likely. Mostly cloudy, with a high near 62.
Saturday Night
Showers likely. Mostly cloudy, with a low around 39.
Sunday
Mostly cloudy, with a high near 52. Breezy.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.5°N 89.05°W
Last Update:
3:41 pm CDT Mar 29, 2026
Forecast Valid:
6pm CDT Mar 29, 2026-6pm CDT Apr 5, 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