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

72°F

22°C

Humidity 94%
Wind Speed Calm
Barometer 29.94 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 15 Jul 11:30 pm CDT
Extended Forecast for

South Beloit IL

  • Overnight

    Overnight: Partly cloudy, with a low around 70. Calm wind.

    Low: 70 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Showers and thunderstorms likely, mainly after 4pm. Partly sunny, with a high near 87. Heat index values as high as 96. Light south wind becoming south southwest 10 to 15 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    High: 87 °F

    Partly Sunny
    then T-storms
    Likely

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 63. Southwest wind 5 to 15 mph becoming northwest after midnight. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 63 °F

    T-storms
    Likely

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly cloudy, with a high near 72. North northeast wind around 10 mph, with gusts as high as 15 mph.

    High: 72 °F

    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 53. Northeast wind 5 to 10 mph.

    Low: 53 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 76.

    High: 76 °F

    Sunny

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 60.

    Low: 60 °F

    Partly Cloudy
    then Chance
    T-storms

  • Saturday

    Saturday: Showers and thunderstorms likely, mainly before 1pm. Mostly cloudy, with a high near 81.

    High: 81 °F

    T-storms
    Likely

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 64.

    Low: 64 °F

    Chance
    T-storms

Detailed Forecast

Overnight
Partly cloudy, with a low around 70. Calm wind.
Wednesday
Showers and thunderstorms likely, mainly after 4pm. Partly sunny, with a high near 87. Heat index values as high as 96. Light south wind becoming south southwest 10 to 15 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night
Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 63. Southwest wind 5 to 15 mph becoming northwest after midnight. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly cloudy, with a high near 72. North northeast wind around 10 mph, with gusts as high as 15 mph.
Thursday Night
Partly cloudy, with a low around 53. Northeast wind 5 to 10 mph.
Friday
Sunny, with a high near 76.
Friday Night
A 40 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 60.
Saturday
Showers and thunderstorms likely, mainly before 1pm. Mostly cloudy, with a high near 81.
Saturday Night
A chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 64.
Sunday
Partly sunny, with a high near 80.
Sunday Night
Partly cloudy, with a low around 61.
Monday
A chance of showers and thunderstorms. Partly sunny, with a high near 82.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 65.
Tuesday
Partly sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.5°N 89.05°W
Last Update:
9:07 pm CDT Jul 15, 2025
Forecast Valid:
12am CDT Jul 16, 2025-6pm CDT Jul 22, 2025
 
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