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

N/A

Humidity NA
Wind Speed Calm
Barometer 30.31 in
Dewpoint N/A
Visibility 10.00 mi
Last update 4 Dec 12:55 am CST
Extended Forecast for

South Beloit IL

  • Overnight

    Overnight: Mostly clear, with a low around -2. Wind chill values as low as -10. Northwest wind around 5 mph, with gusts as high as 15 mph.

    Low: -2 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and cold, with a high near 10. Wind chill values as low as -12. North northwest wind around 5 mph becoming calm.

    High: 10 °F

    Cold

  • Thursday Night

    Thursday Night: Partly cloudy, with a temperature falling to near -2 by 8pm, then rising to around 5 during the remainder of the night. Wind chill values as low as -9. South wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: -2 °F⇑

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 24. Wind chill values as low as -8. South southwest wind around 10 mph, with gusts as high as 15 mph.

    High: 24 °F

    Partly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of snow showers before midnight. Mostly cloudy, with a low around 16. South southwest wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 15 mph.

    Low: 16 °F

    Chance Snow
    Showers then
    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 27.

    High: 27 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 40 percent chance of snow, mainly after midnight. Mostly cloudy, with a low around 8.

    Low: 8 °F

    Chance Snow

  • Sunday

    Sunday: Partly sunny, with a high near 20.

    High: 20 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around -3.

    Low: -3 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around -2. Wind chill values as low as -10. Northwest wind around 5 mph, with gusts as high as 15 mph.
Thursday
Sunny and cold, with a high near 10. Wind chill values as low as -12. North northwest wind around 5 mph becoming calm.
Thursday Night
Partly cloudy, with a temperature falling to near -2 by 8pm, then rising to around 5 during the remainder of the night. Wind chill values as low as -9. South wind 5 to 10 mph, with gusts as high as 15 mph.
Friday
Partly sunny, with a high near 24. Wind chill values as low as -8. South southwest wind around 10 mph, with gusts as high as 15 mph.
Friday Night
A 30 percent chance of snow showers before midnight. Mostly cloudy, with a low around 16. South southwest wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 15 mph.
Saturday
Mostly cloudy, with a high near 27.
Saturday Night
A 40 percent chance of snow, mainly after midnight. Mostly cloudy, with a low around 8.
Sunday
Partly sunny, with a high near 20.
Sunday Night
Mostly cloudy, with a low around -3.
Monday
Partly sunny, with a high near 21.
Monday Night
A chance of snow. Mostly cloudy, with a low around 11.
Tuesday
Mostly cloudy, with a high near 30.
Tuesday Night
A chance of snow. Mostly cloudy, with a low around 21.
Wednesday
A chance of rain and snow. Mostly cloudy, with a high near 34.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.5°N 89.05°W
Last Update:
11:46 pm CST Dec 3, 2025
Forecast Valid:
1am CST Dec 4, 2025-6pm CST Dec 10, 2025
 
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Additional Resources

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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