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

37°F

3°C

Humidity 75%
Wind Speed SW 9 mph
Barometer 29.63 in
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Wind Chill30°F (-1°C)
Last update 13 Jan 5:45 am CST
Extended Forecast for

South Beloit IL

  • Today

    Today: Partly sunny, with a high near 51. Breezy, with a south southwest wind 10 to 20 mph becoming west in the afternoon. Winds could gust as high as 30 mph.

    High: 51 °F

    Partly Sunny
    then Mostly
    Sunny and
    Breezy

  • Tonight

    Tonight: Isolated snow showers between midnight and 3am, then scattered flurries with isolated snow showers after 3am. Mostly cloudy, with a low around 21. Blustery, with a west northwest wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.

    Low: 21 °F

    Mostly Cloudy
    then Isolated
    Snow Showers
    and Blustery

  • Wednesday

    Wednesday: Scattered flurries before 8am. Partly sunny, with a temperature falling to around 20 by 5pm. Blustery, with a north northwest wind around 20 mph, with gusts as high as 35 mph.

    High: 23 °F⇓

    Scattered
    Flurries and
    Blustery

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 10. Wind chill values as low as -1. North northwest wind 10 to 15 mph, with gusts as high as 30 mph.

    Low: 10 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 25. North northwest wind 5 to 10 mph becoming south southwest in the afternoon. Winds could gust as high as 20 mph.

    High: 25 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Snow. Low around 21. Chance of precipitation is 80%.

    Low: 21 °F

    Snow

  • Friday

    Friday: Snow likely before noon, then snow showers likely after noon. Mostly cloudy, with a high near 33. Chance of precipitation is 70%.

    High: 33 °F

    Snow Likely

  • Friday Night

    Friday Night: A chance of snow showers. Mostly cloudy, with a low around 12.

    Low: 12 °F

    Chance Snow
    Showers

  • Saturday

    Saturday: A chance of snow showers. Mostly cloudy, with a high near 16.

    High: 16 °F

    Chance Snow
    Showers

Detailed Forecast

Today
Partly sunny, with a high near 51. Breezy, with a south southwest wind 10 to 20 mph becoming west in the afternoon. Winds could gust as high as 30 mph.
Tonight
Isolated snow showers between midnight and 3am, then scattered flurries with isolated snow showers after 3am. Mostly cloudy, with a low around 21. Blustery, with a west northwest wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.
Wednesday
Scattered flurries before 8am. Partly sunny, with a temperature falling to around 20 by 5pm. Blustery, with a north northwest wind around 20 mph, with gusts as high as 35 mph.
Wednesday Night
Partly cloudy, with a low around 10. Wind chill values as low as -1. North northwest wind 10 to 15 mph, with gusts as high as 30 mph.
Thursday
Mostly sunny, with a high near 25. North northwest wind 5 to 10 mph becoming south southwest in the afternoon. Winds could gust as high as 20 mph.
Thursday Night
Snow. Low around 21. Chance of precipitation is 80%.
Friday
Snow likely before noon, then snow showers likely after noon. Mostly cloudy, with a high near 33. Chance of precipitation is 70%.
Friday Night
A chance of snow showers. Mostly cloudy, with a low around 12.
Saturday
A chance of snow showers. Mostly cloudy, with a high near 16.
Saturday Night
Mostly cloudy, with a low around 4.
Sunday
Partly sunny, with a high near 14.
Sunday Night
Mostly cloudy, with a low around 3.
M.L.King Day
Partly sunny, with a high near 16.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.5°N 89.05°W
Last Update:
6:36 am CST Jan 13, 2026
Forecast Valid:
6am CST Jan 13, 2026-6pm CST Jan 19, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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