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.

Fog

57°F

14°C

Humidity 100%
Wind Speed Calm
Barometer 29.90 in
Dewpoint 57°F (14°C)
Visibility 0.15 mi
Last update 25 Jun 4:10 am CDT
Extended Forecast for

South Beloit IL

  • Today

    Today: Areas of fog before 7am. Otherwise, mostly sunny, with a high near 76. Light west wind becoming west northwest 5 to 10 mph in the morning. Winds could gust as high as 15 mph.

    High: 76 °F

    Areas Fog
    then Mostly
    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 55. North northwest wind around 5 mph becoming calm in the evening.

    Low: 55 °F

    Partly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 74. East wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 74 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Partly cloudy, with a low around 56. East northeast wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 56 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 79. East wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 79 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy
    then Chance
    T-storms

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 87.

    High: 87 °F

    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 73.

    Low: 73 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 92.

    High: 92 °F

    Mostly Sunny

Detailed Forecast

Today
Areas of fog before 7am. Otherwise, mostly sunny, with a high near 76. Light west wind becoming west northwest 5 to 10 mph in the morning. Winds could gust as high as 15 mph.
Tonight
Partly cloudy, with a low around 55. North northwest wind around 5 mph becoming calm in the evening.
Friday
Mostly cloudy, with a high near 74. East wind 5 to 10 mph, with gusts as high as 20 mph.
Friday Night
Partly cloudy, with a low around 56. East northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Saturday
Mostly sunny, with a high near 79. East wind 5 to 10 mph, with gusts as high as 15 mph.
Saturday Night
A 30 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 63.
Sunday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 87.
Sunday Night
Partly cloudy, with a low around 73.
Monday
Mostly sunny, with a high near 92.
Monday Night
Partly cloudy, with a low around 75.
Tuesday
Mostly sunny, with a high near 93.
Tuesday Night
Mostly clear, with a low around 73.
Wednesday
Mostly sunny, with a high near 92.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.47°N 89.02°W
Last Update:
3:01 am CDT Jun 25, 2026
Forecast Valid:
4am CDT Jun 25, 2026-6pm CDT Jul 1, 2026
 
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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