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

25°F

-4°C

Humidity 80%
Wind Speed NW 13 mph
Barometer 30.16 in
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill13°F (-11°C)
Last update 11 Jan 5:10 am CST
Extended Forecast for

South Beloit IL

  • Overnight

    Overnight: Scattered flurries. Cloudy, with a low around 20. Blustery, with a northwest wind around 20 mph, with gusts as high as 35 mph.

    Low: 20 °F

    Scattered
    Flurries and
    Blustery

  • Sunday

    Sunday: Scattered flurries before 9am. Cloudy, then gradually becoming mostly sunny, with a high near 32. Breezy, with a northwest wind 15 to 20 mph decreasing to 10 to 15 mph in the afternoon. Winds could gust as high as 35 mph.

    High: 32 °F

    Scattered
    Flurries and
    Breezy then
    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 26. Southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 26 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 41. West southwest wind around 10 mph, with gusts as high as 15 mph.

    High: 41 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 31. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 31 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of showers before noon. Partly sunny, with a high near 47.

    High: 47 °F

    Chance
    Showers then
    Partly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of rain showers between midnight and 3am, then a slight chance of snow showers after 3am. Mostly cloudy, with a low around 28. Chance of precipitation is 20%.

    Low: 28 °F

    Mostly Cloudy
    then Slight
    Chance
    Rain/Snow

  • Wednesday

    Wednesday: A chance of snow showers before noon. Mostly cloudy, with a high near 29. Blustery.

    High: 29 °F

    Blustery.
    Chance Snow
    Showers then
    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 14.

    Low: 14 °F

    Partly Cloudy

Detailed Forecast

Overnight
Scattered flurries. Cloudy, with a low around 20. Blustery, with a northwest wind around 20 mph, with gusts as high as 35 mph.
Sunday
Scattered flurries before 9am. Cloudy, then gradually becoming mostly sunny, with a high near 32. Breezy, with a northwest wind 15 to 20 mph decreasing to 10 to 15 mph in the afternoon. Winds could gust as high as 35 mph.
Sunday Night
Partly cloudy, with a low around 26. Southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Monday
Mostly sunny, with a high near 41. West southwest wind around 10 mph, with gusts as high as 15 mph.
Monday Night
Mostly cloudy, with a low around 31. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Tuesday
A 30 percent chance of showers before noon. Partly sunny, with a high near 47.
Tuesday Night
A slight chance of rain showers between midnight and 3am, then a slight chance of snow showers after 3am. Mostly cloudy, with a low around 28. Chance of precipitation is 20%.
Wednesday
A chance of snow showers before noon. Mostly cloudy, with a high near 29. Blustery.
Wednesday Night
Partly cloudy, with a low around 14.
Thursday
Mostly sunny, with a high near 27.
Thursday Night
A chance of snow. Mostly cloudy, with a low around 21.
Friday
A chance of snow showers. Mostly cloudy, with a high near 31.
Friday Night
A chance of snow showers. Mostly cloudy, with a low around 14.
Saturday
Partly sunny, with a high near 22.
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:
4:26 am CST Jan 11, 2026
Forecast Valid:
5am CST Jan 11, 2026-6pm CST Jan 17, 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