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.

Mostly Cloudy

27°F

-3°C

Humidity 59%
Wind Speed S 15 mph
Barometer 30.17 in
Dewpoint 14°F (-10°C)
Visibility 10.00 mi
Wind Chill15°F (-9°C)
Last update 1 Feb 12:45 pm CST
Extended Forecast for

South Beloit IL

  • This Afternoon

    This Afternoon: A 20 percent chance of snow after 4pm. Mostly cloudy, with a high near 25. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 25 °F

    Slight Chance
    Snow

  • Tonight

    Tonight: Snow likely, mainly before midnight. Cloudy, with a steady temperature around 20. South southwest wind 5 to 10 mph becoming west after midnight. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    Low: 20 °F

    Snow Likely
    then Chance
    Snow

  • Monday

    Monday: Partly sunny, with a high near 25. West northwest wind 5 to 10 mph.

    High: 25 °F

    Partly Sunny

  • Monday Night

    Monday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 11. West northwest wind around 5 mph becoming calm in the evening.

    Low: 11 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Tuesday

    Tuesday: Sunny, with a high near 22. North wind around 5 mph, with gusts as high as 10 mph.

    High: 22 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 4.

    Low: 4 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 23.

    High: 23 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 10.

    Low: 10 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 33.

    High: 33 °F

    Partly Sunny

Detailed Forecast

This Afternoon
A 20 percent chance of snow after 4pm. Mostly cloudy, with a high near 25. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Tonight
Snow likely, mainly before midnight. Cloudy, with a steady temperature around 20. South southwest wind 5 to 10 mph becoming west after midnight. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Monday
Partly sunny, with a high near 25. West northwest wind 5 to 10 mph.
Monday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 11. West northwest wind around 5 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 22. North wind around 5 mph, with gusts as high as 10 mph.
Tuesday Night
Mostly clear, with a low around 4.
Wednesday
Sunny, with a high near 23.
Wednesday Night
Mostly cloudy, with a low around 10.
Thursday
Partly sunny, with a high near 33.
Thursday Night
A chance of rain and snow before midnight. Mostly cloudy, with a low around 25.
Friday
Partly sunny, with a high near 33.
Friday Night
Partly cloudy, with a low around 8.
Saturday
Mostly sunny, 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:
12:46 pm CST Feb 1, 2026
Forecast Valid:
1pm CST Feb 1, 2026-6pm CST Feb 7, 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