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.

Fair

45°F

7°C

Humidity 61%
Wind Speed NE 7 mph
Barometer 30.31 in
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 21 May 3:15 am CDT
Extended Forecast for

South Beloit IL

  • Overnight

    Overnight: Partly cloudy, with a low around 42. East northeast wind around 10 mph.

    Low: 42 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of sprinkles between 8am and 1pm. Mostly cloudy, with a high near 60. East wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 60 °F

    Slight Chance
    Sprinkles

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 45. East northeast wind 10 to 15 mph.

    Low: 45 °F

    Mostly Cloudy

  • Friday

    Friday: A 20 percent chance of showers after 1pm. Partly sunny, with a high near 65. East wind around 15 mph, with gusts as high as 25 mph.

    High: 65 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: A 50 percent chance of showers. Cloudy, with a low around 50. East wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 50 °F

    Chance
    Showers

  • Saturday

    Saturday: A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 72.

    High: 72 °F

    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 52.

    Low: 52 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: Partly sunny, with a high near 78.

    High: 78 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 53.

    Low: 53 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 42. East northeast wind around 10 mph.
Thursday
A slight chance of sprinkles between 8am and 1pm. Mostly cloudy, with a high near 60. East wind 10 to 15 mph, with gusts as high as 20 mph.
Thursday Night
Mostly cloudy, with a low around 45. East northeast wind 10 to 15 mph.
Friday
A 20 percent chance of showers after 1pm. Partly sunny, with a high near 65. East wind around 15 mph, with gusts as high as 25 mph.
Friday Night
A 50 percent chance of showers. Cloudy, with a low around 50. East wind 10 to 15 mph, with gusts as high as 25 mph.
Saturday
A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 72.
Saturday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 52.
Sunday
Partly sunny, with a high near 78.
Sunday Night
Mostly clear, with a low around 53.
Memorial Day
Mostly sunny, with a high near 82.
Monday Night
Partly cloudy, with a low around 56.
Tuesday
Mostly sunny, with a high near 84.
Tuesday Night
A chance of showers. Partly cloudy, with a low around 59.
Wednesday
A chance of showers. 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:
3:06 am CDT May 21, 2026
Forecast Valid:
3am CDT May 21, 2026-6pm CDT May 27, 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