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.

Partly Cloudy

59°F

15°C

Humidity 48%
Wind Speed N 12 G 18 mph
Barometer 30.27 in
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Last update 20 May 10:45 am CDT
Extended Forecast for

South Beloit IL

  • Today

    Today: Mostly sunny, with a high near 64. North northeast wind around 10 mph, with gusts as high as 15 mph.

    High: 64 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 41. Northeast wind around 10 mph.

    Low: 41 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 61. East northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 61 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 46. East northeast wind around 10 mph.

    Low: 46 °F

    Mostly Cloudy

  • Friday

    Friday: A 40 percent chance of showers after 1pm. Mostly cloudy, with a high near 64. East wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 64 °F

    Mostly Cloudy
    then Chance
    Showers

  • Friday Night

    Friday Night: Showers likely before 10pm, then showers likely and possibly a thunderstorm between 10pm and 1am, then showers likely after 1am. Mostly cloudy, with a low around 51. Chance of precipitation is 70%.

    Low: 51 °F

    Showers
    Likely

  • Saturday

    Saturday: Mostly cloudy, with a high near 71.

    High: 71 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 52.

    Low: 52 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 76.

    High: 76 °F

    Partly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 64. North northeast wind around 10 mph, with gusts as high as 15 mph.
Tonight
Partly cloudy, with a low around 41. Northeast wind around 10 mph.
Thursday
Partly sunny, with a high near 61. East northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Thursday Night
Mostly cloudy, with a low around 46. East northeast wind around 10 mph.
Friday
A 40 percent chance of showers after 1pm. Mostly cloudy, with a high near 64. East wind 10 to 15 mph, with gusts as high as 25 mph.
Friday Night
Showers likely before 10pm, then showers likely and possibly a thunderstorm between 10pm and 1am, then showers likely after 1am. Mostly cloudy, with a low around 51. Chance of precipitation is 70%.
Saturday
Mostly cloudy, with a high near 71.
Saturday Night
Mostly cloudy, with a low around 52.
Sunday
Partly sunny, with a high near 76.
Sunday Night
Partly cloudy, with a low around 53.
Memorial Day
Partly sunny, with a high near 81.
Monday Night
Partly cloudy, with a low around 56.
Tuesday
Mostly sunny, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.5°N 89.05°W
Last Update:
10:51 am CDT May 20, 2026
Forecast Valid:
11am CDT May 20, 2026-6pm CDT May 26, 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