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

63°F

17°C

Humidity 37%
Wind Speed Calm
Barometer 30.09 in
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 14 May 11:45 am CDT
Extended Forecast for

South Beloit IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 69. South wind around 5 mph.

    High: 69 °F

    Sunny

  • Tonight

    Tonight: A 30 percent chance of showers, mainly between midnight and 4am. Increasing clouds, with a low around 51. South southeast wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 51 °F

    Partly Cloudy
    then Chance
    Showers

  • Friday

    Friday: Mostly cloudy, then gradually becoming sunny, with a high near 76. South southwest wind around 15 mph, with gusts as high as 30 mph.

    High: 76 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms after 1am. Increasing clouds, with a low around 57. South wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 57 °F

    Mostly Clear
    then Chance
    Showers

  • Saturday

    Saturday: A slight chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 83. Calm wind becoming west southwest around 5 mph in the morning. Winds could gust as high as 10 mph. Chance of precipitation is 60%.

    High: 83 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 54. Chance of precipitation is 40%.

    Low: 54 °F

    Chance
    T-storms then
    Chance
    Showers

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 80. Chance of precipitation is 60%.

    High: 80 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A chance of showers before 1am. Mostly cloudy, with a low around 61.

    Low: 61 °F

    Chance
    Showers

  • Monday

    Monday: A chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 84. Breezy.

    High: 84 °F

    Breezy.
    Mostly Sunny
    then Chance
    T-storms

Detailed Forecast

This Afternoon
Sunny, with a high near 69. South wind around 5 mph.
Tonight
A 30 percent chance of showers, mainly between midnight and 4am. Increasing clouds, with a low around 51. South southeast wind 5 to 10 mph, with gusts as high as 15 mph.
Friday
Mostly cloudy, then gradually becoming sunny, with a high near 76. South southwest wind around 15 mph, with gusts as high as 30 mph.
Friday Night
A 50 percent chance of showers and thunderstorms after 1am. Increasing clouds, with a low around 57. South wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday
A slight chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 83. Calm wind becoming west southwest around 5 mph in the morning. Winds could gust as high as 10 mph. Chance of precipitation is 60%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 54. Chance of precipitation is 40%.
Sunday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 80. Chance of precipitation is 60%.
Sunday Night
A chance of showers before 1am. Mostly cloudy, with a low around 61.
Monday
A chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 84. Breezy.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 61.
Tuesday
Showers likely. Partly sunny, with a high near 75.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 52.
Wednesday
Partly sunny, with a high near 70.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.5°N 89.05°W
Last Update:
10:46 am CDT May 14, 2026
Forecast Valid:
12pm CDT May 14, 2026-6pm CDT May 20, 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