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.

Overcast with Haze

18°F

-8°C

Humidity 100%
Wind Speed SW 14 mph
Barometer 29.98 in
Dewpoint 18°F (-8°C)
Visibility 3.00 mi
Wind Chill4°F (-16°C)
Last update 2 Dec 1:45 pm CST
Extended Forecast for

South Beloit IL

  • This Afternoon

    This Afternoon: Cloudy, with a high near 21. Southwest wind around 10 mph, with gusts as high as 15 mph.

    High: 21 °F

    Cloudy

  • Tonight

    Tonight: Cloudy, with a temperature rising to around 24 by 3am. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 21 °F⇑

    Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of snow showers, mainly before 1pm. Cloudy, with a temperature rising to near 30 by noon, then falling to around 21 during the remainder of the day. Southwest wind 10 to 15 mph becoming northwest in the morning. Winds could gust as high as 20 mph.

    High: 30 °F⇓

    Chance Snow
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around -4. Wind chill values as low as -16. Northwest wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: -4 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 12. Northwest wind around 5 mph becoming south southwest in the afternoon.

    High: 12 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around -4.

    Low: -4 °F

    Partly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 21.

    High: 21 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 12.

    Low: 12 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 25.

    High: 25 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Cloudy, with a high near 21. Southwest wind around 10 mph, with gusts as high as 15 mph.
Tonight
Cloudy, with a temperature rising to around 24 by 3am. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Wednesday
A 30 percent chance of snow showers, mainly before 1pm. Cloudy, with a temperature rising to near 30 by noon, then falling to around 21 during the remainder of the day. Southwest wind 10 to 15 mph becoming northwest in the morning. Winds could gust as high as 20 mph.
Wednesday Night
Partly cloudy, with a low around -4. Wind chill values as low as -16. Northwest wind 5 to 10 mph, with gusts as high as 20 mph.
Thursday
Sunny, with a high near 12. Northwest wind around 5 mph becoming south southwest in the afternoon.
Thursday Night
Partly cloudy, with a low around -4.
Friday
Mostly cloudy, with a high near 21.
Friday Night
Mostly cloudy, with a low around 12.
Saturday
Partly sunny, with a high near 25.
Saturday Night
A chance of snow. Mostly cloudy, with a low around 10.
Sunday
A chance of snow. Mostly cloudy, with a high near 22.
Sunday Night
A chance of snow. Mostly cloudy, with a low around 4.
Monday
Mostly cloudy, with a high near 23.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.5°N 89.05°W
Last Update:
1:52 pm CST Dec 2, 2025
Forecast Valid:
1pm CST Dec 2, 2025-6pm CST Dec 8, 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