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/Mist

36°F

2°C

Humidity 93%
Wind Speed W 10 mph
Barometer 29.27 in
Dewpoint 34°F (1°C)
Visibility 5.00 mi
Wind Chill29°F (-2°C)
Last update 10 Dec 2:55 am CST
Extended Forecast for

South Beloit IL

  • Overnight

    Overnight: A chance of rain before 5am, then snow, possibly mixed with rain. Steady temperature around 35. Breezy, with a west wind around 20 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.

    Low: 35 °F

    Rain/Snow and
    Breezy

  • Wednesday

    Wednesday: Snow, possibly mixed with rain before 10am, then a chance of snow. Temperature falling to around 25 by 5pm. Blustery, with a north northwest wind 15 to 20 mph decreasing to 10 to 15 mph in the afternoon. Winds could gust as high as 35 mph. Chance of precipitation is 100%. New snow accumulation of less than one inch possible.

    High: 31 °F⇓

    Rain/Snow and
    Blustery then
    Slight Chance
    Snow Showers

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow showers before 9pm. Cloudy, then gradually becoming partly cloudy, with a low around 8. Northwest wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 8 °F

    Slight Chance
    Snow Showers
    then Partly
    Cloudy

  • Thursday

    Thursday: A 20 percent chance of snow after noon. Partly sunny, with a high near 21. Wind chill values as low as 1. West northwest wind around 5 mph becoming south in the afternoon.

    High: 21 °F

    Mostly Sunny
    then Slight
    Chance Snow

  • Thursday Night

    Thursday Night: Snow likely, mainly before midnight. Mostly cloudy, with a low around 12. South wind around 5 mph becoming calm. Chance of precipitation is 60%.

    Low: 12 °F

    Snow Likely

  • Friday

    Friday: A 40 percent chance of snow, mainly before noon. Mostly cloudy, with a high near 24.

    High: 24 °F

    Chance Snow

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 0.

    Low: 0 °F

    Mostly Cloudy

  • Saturday

    Saturday: A chance of snow. Mostly cloudy and cold, with a high near 8.

    High: 8 °F

    Chance Snow

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around -8.

    Low: -8 °F

    Partly Cloudy

Detailed Forecast

Overnight
A chance of rain before 5am, then snow, possibly mixed with rain. Steady temperature around 35. Breezy, with a west wind around 20 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Wednesday
Snow, possibly mixed with rain before 10am, then a chance of snow. Temperature falling to around 25 by 5pm. Blustery, with a north northwest wind 15 to 20 mph decreasing to 10 to 15 mph in the afternoon. Winds could gust as high as 35 mph. Chance of precipitation is 100%. New snow accumulation of less than one inch possible.
Wednesday Night
A 20 percent chance of snow showers before 9pm. Cloudy, then gradually becoming partly cloudy, with a low around 8. Northwest wind 5 to 10 mph, with gusts as high as 15 mph.
Thursday
A 20 percent chance of snow after noon. Partly sunny, with a high near 21. Wind chill values as low as 1. West northwest wind around 5 mph becoming south in the afternoon.
Thursday Night
Snow likely, mainly before midnight. Mostly cloudy, with a low around 12. South wind around 5 mph becoming calm. Chance of precipitation is 60%.
Friday
A 40 percent chance of snow, mainly before noon. Mostly cloudy, with a high near 24.
Friday Night
Mostly cloudy, with a low around 0.
Saturday
A chance of snow. Mostly cloudy and cold, with a high near 8.
Saturday Night
Partly cloudy, with a low around -8.
Sunday
Sunny and cold, with a high near 5.
Sunday Night
Partly cloudy, with a low around -7.
Monday
Partly sunny, with a high near 19.
Monday Night
Mostly cloudy, with a low around 8.
Tuesday
Partly sunny, with a high near 32.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.5°N 89.05°W
Last Update:
1:56 am CST Dec 10, 2025
Forecast Valid:
3am CST Dec 10, 2025-6pm CST Dec 16, 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