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

37°F

3°C

Humidity 100%
Wind Speed W 6 mph
Barometer 30.13 in
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 6 Apr 2:30 am CDT
Extended Forecast for

South Beloit IL

  • Overnight

    Overnight: Partly cloudy, with a low around 36. Northwest wind around 10 mph, with gusts as high as 20 mph.

    Low: 36 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 47. Northwest wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 47 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 22. North northeast wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 22 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 43. Northeast wind 5 to 10 mph becoming southeast in the afternoon.

    High: 43 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A chance of snow showers between 1am and 4am, then a chance of rain showers after 4am. Mostly cloudy, with a low around 30. Southeast wind 10 to 15 mph. Chance of precipitation is 30%.

    Low: 30 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

  • Wednesday

    Wednesday: A 30 percent chance of showers before 7am. Mostly cloudy, with a high near 63. Breezy.

    High: 63 °F

    Breezy.
    Chance
    Showers then
    Partly Sunny

  • Wednesday Night

    Wednesday Night: A chance of showers before 10pm, then a chance of showers and thunderstorms between 10pm and 1am, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 51. Chance of precipitation is 60%.

    Low: 51 °F

    Showers
    Likely

  • Thursday

    Thursday: A chance of showers. Mostly cloudy, with a high near 63.

    High: 63 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers. Mostly cloudy, with a low around 44.

    Low: 44 °F

    Chance
    Showers

Detailed Forecast

Overnight
Partly cloudy, with a low around 36. Northwest wind around 10 mph, with gusts as high as 20 mph.
Monday
Partly sunny, with a high near 47. Northwest wind 10 to 15 mph, with gusts as high as 30 mph.
Monday Night
Partly cloudy, with a low around 22. North northeast wind 5 to 15 mph, with gusts as high as 20 mph.
Tuesday
Mostly sunny, with a high near 43. Northeast wind 5 to 10 mph becoming southeast in the afternoon.
Tuesday Night
A chance of snow showers between 1am and 4am, then a chance of rain showers after 4am. Mostly cloudy, with a low around 30. Southeast wind 10 to 15 mph. Chance of precipitation is 30%.
Wednesday
A 30 percent chance of showers before 7am. Mostly cloudy, with a high near 63. Breezy.
Wednesday Night
A chance of showers before 10pm, then a chance of showers and thunderstorms between 10pm and 1am, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 51. Chance of precipitation is 60%.
Thursday
A chance of showers. Mostly cloudy, with a high near 63.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 44.
Friday
Mostly sunny, with a high near 60.
Friday Night
A chance of showers. Partly cloudy, with a low around 39.
Saturday
A chance of showers. Partly sunny, with a high near 60.
Saturday Night
A chance of showers. Cloudy, with a low around 50.
Sunday
Showers likely. Mostly cloudy, with a high near 74.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.5°N 89.05°W
Last Update:
2:41 am CDT Apr 6, 2026
Forecast Valid:
2am CDT Apr 6, 2026-6pm CDT Apr 12, 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