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.

Rain Thunderstorm in Vicinity

45°F

7°C

Humidity 93%
Wind Speed N 12 mph
Barometer 29.85 in
Dewpoint 43°F (6°C)
Visibility 2.00 mi
Wind Chill39°F (4°C)
Last update 31 Mar 2:45 pm CDT
Extended Forecast for

South Beloit IL

  • This Afternoon

    This Afternoon: Showers and thunderstorms likely. Mostly cloudy, with a steady temperature around 50. North northwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 50 °F

    T-storms
    Likely

  • Tonight

    Tonight: A chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 8pm. Mostly cloudy, with a low around 36. Northeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    Low: 36 °F

    Chance
    T-storms then
    Mostly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of showers after 5pm. Mostly cloudy, with a high near 46. East northeast wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 46 °F

    Mostly Cloudy
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7pm. Low around 39. East wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%.

    Low: 39 °F

    Showers

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 71. Breezy, with an east southeast wind 15 to 20 mph becoming south in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 100%.

    High: 71 °F

    Showers and
    Breezy

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 42.

    Low: 42 °F

    Chance
    Showers

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 66.

    High: 66 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm. Mostly cloudy, with a low around 45.

    Low: 45 °F

    Showers

  • Saturday

    Saturday: A chance of showers. Mostly cloudy, with a high near 57. Breezy.

    High: 57 °F

    Chance
    Showers and
    Breezy

Detailed Forecast

This Afternoon
Showers and thunderstorms likely. Mostly cloudy, with a steady temperature around 50. North northwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
A chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 8pm. Mostly cloudy, with a low around 36. Northeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Wednesday
A 30 percent chance of showers after 5pm. Mostly cloudy, with a high near 46. East northeast wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7pm. Low around 39. East wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%.
Thursday
Showers and possibly a thunderstorm. High near 71. Breezy, with an east southeast wind 15 to 20 mph becoming south in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 100%.
Thursday Night
A 40 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 42.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 66.
Friday Night
Showers and possibly a thunderstorm. Mostly cloudy, with a low around 45.
Saturday
A chance of showers. Mostly cloudy, with a high near 57. Breezy.
Saturday Night
Mostly cloudy, with a low around 31.
Sunday
Partly sunny, with a high near 48.
Sunday Night
Mostly clear, with a low around 29.
Monday
Mostly sunny, with a high near 55.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.5°N 89.05°W
Last Update:
2:36 pm CDT Mar 31, 2026
Forecast Valid:
3pm CDT Mar 31, 2026-6pm CDT Apr 6, 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