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

54°F

12°C

Humidity 100%
Wind Speed NW 5 mph
Barometer 30.05 in
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Wind Chill53°F (12°C)
Last update 23 Aug 5:45 am CDT
Extended Forecast for

South Beloit IL

  • Today

    Today: Sunny, with a high near 75. North northwest wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 75 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 51. North northwest wind around 5 mph becoming calm in the evening.

    Low: 51 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 76. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 76 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 54. Calm wind.

    Low: 54 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 79. Calm wind becoming southwest around 5 mph in the afternoon. Winds could gust as high as 10 mph.

    High: 79 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 61.

    Low: 61 °F

    Partly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 82.

    High: 82 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 75. North northwest wind 5 to 10 mph, with gusts as high as 15 mph.
Tonight
Mostly clear, with a low around 51. North northwest wind around 5 mph becoming calm in the evening.
Monday
Sunny, with a high near 76. Calm wind becoming northwest around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 54. Calm wind.
Tuesday
Mostly sunny, with a high near 79. Calm wind becoming southwest around 5 mph in the afternoon. Winds could gust as high as 10 mph.
Tuesday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 61.
Wednesday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 82.
Wednesday Night
Mostly clear, with a low around 60.
Thursday
Sunny, with a high near 80.
Thursday Night
Mostly clear, with a low around 57.
Friday
Sunny, with a high near 79.
Friday Night
Partly cloudy, with a low around 56.
Saturday
Partly sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.47°N 89.05°W
Last Update:
3:41 am CDT Aug 23, 2026
Forecast Valid:
6am CDT Aug 23, 2026-6pm CDT Aug 29, 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