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.

Fair

27°F

-3°C

Humidity 80%
Wind Speed SW 10 mph
Barometer 30.10 in
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill18°F (-8°C)
Last update 12 Jan 4:30 am CST
Extended Forecast for

South Beloit IL

  • Today

    Today: Sunny, with a high near 43. West southwest wind around 10 mph, with gusts as high as 20 mph.

    High: 43 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 31. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 31 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: A slight chance of sprinkles. Partly sunny, with a high near 48. West wind around 15 mph, with gusts as high as 25 mph.

    High: 48 °F

    Slight Chance
    Sprinkles

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 29. West wind around 15 mph, with gusts as high as 25 mph.

    Low: 29 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 40 percent chance of snow showers. Mostly cloudy, with a high near 30. Blustery, with a north wind around 20 mph, with gusts as high as 35 mph.

    High: 30 °F

    Chance Snow
    Showers and
    Blustery

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 12. Blustery.

    Low: 12 °F

    Mostly Cloudy
    and Blustery
    then Mostly
    Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 24.

    High: 24 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of snow. Mostly cloudy, with a low around 20.

    Low: 20 °F

    Chance Snow

  • Friday

    Friday: Scattered snow showers. Cloudy, with a high near 31.

    High: 31 °F

    Scattered
    Snow Showers

Detailed Forecast

Today
Sunny, with a high near 43. West southwest wind around 10 mph, with gusts as high as 20 mph.
Tonight
Increasing clouds, with a low around 31. South southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday
A slight chance of sprinkles. Partly sunny, with a high near 48. West wind around 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly cloudy, with a low around 29. West wind around 15 mph, with gusts as high as 25 mph.
Wednesday
A 40 percent chance of snow showers. Mostly cloudy, with a high near 30. Blustery, with a north wind around 20 mph, with gusts as high as 35 mph.
Wednesday Night
Partly cloudy, with a low around 12. Blustery.
Thursday
Mostly sunny, with a high near 24.
Thursday Night
A chance of snow. Mostly cloudy, with a low around 20.
Friday
Scattered snow showers. Cloudy, with a high near 31.
Friday Night
Scattered snow showers. Mostly cloudy, with a low around 15.
Saturday
A chance of snow showers. Mostly cloudy, with a high near 18.
Saturday Night
Mostly cloudy, with a low around 3.
Sunday
Partly sunny, with a high near 16.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.5°N 89.05°W
Last Update:
2:31 am CST Jan 12, 2026
Forecast Valid:
4am CST Jan 12, 2026-6pm CST Jan 18, 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