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

59°F

15°C

Humidity 88%
Wind Speed N 7 mph
Barometer 29.97 in
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 14 Oct 2:55 am CDT
Extended Forecast for

South Beloit IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 58. North wind around 5 mph.

    Low: 58 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 65. Northeast wind 5 to 10 mph.

    High: 65 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 52. East northeast wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 52 °F

    Mostly Cloudy

  • Thursday

    Thursday: Rain, with thunderstorms also possible after 1pm. High near 58. East wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 100%.

    High: 58 °F

    Rain

  • Thursday Night

    Thursday Night: Rain likely and possibly a thunderstorm before 1am, then a slight chance of rain. Mostly cloudy, with a low around 45. North northeast wind 5 to 10 mph becoming northwest 10 to 15 mph after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 70%.

    Low: 45 °F

    Rain Likely

  • Friday

    Friday: A 20 percent chance of rain before 1pm. Partly sunny, with a high near 53. Breezy.

    High: 53 °F

    Slight Chance
    Rain and
    Breezy

  • Friday Night

    Friday Night: Widespread frost, mainly after 3am. Otherwise, mostly clear, with a low around 31.

    Low: 31 °F

    Mostly Clear
    then Frost

  • Saturday

    Saturday: Widespread frost, mainly before 8am. Otherwise, sunny, with a high near 55.

    High: 55 °F

    Frost then
    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 38.

    Low: 38 °F

    Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 58. North wind around 5 mph.
Wednesday
Mostly cloudy, with a high near 65. Northeast wind 5 to 10 mph.
Wednesday Night
Mostly cloudy, with a low around 52. East northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Thursday
Rain, with thunderstorms also possible after 1pm. High near 58. East wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 100%.
Thursday Night
Rain likely and possibly a thunderstorm before 1am, then a slight chance of rain. Mostly cloudy, with a low around 45. North northeast wind 5 to 10 mph becoming northwest 10 to 15 mph after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 70%.
Friday
A 20 percent chance of rain before 1pm. Partly sunny, with a high near 53. Breezy.
Friday Night
Widespread frost, mainly after 3am. Otherwise, mostly clear, with a low around 31.
Saturday
Widespread frost, mainly before 8am. Otherwise, sunny, with a high near 55.
Saturday Night
Clear, with a low around 38.
Sunday
Sunny, with a high near 64.
Sunday Night
Partly cloudy, with a low around 45.
Monday
Partly sunny, with a high near 65.
Monday Night
Partly cloudy, with a low around 44.
Tuesday
Mostly sunny, with a high near 69.
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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 Oct 14, 2026
Forecast Valid:
3am CDT Oct 14, 2026-6pm CDT Oct 20, 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