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

54°F

12°C

Humidity 82%
Wind Speed E 5 mph
Barometer 30.17 in
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Wind Chill53°F (12°C)
Last update 14 Oct 9:35 pm CDT
Extended Forecast for

South Beloit IL

  • Tonight

    Tonight: 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: Showers, mainly after 10am. High near 58. East wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

    High: 58 °F

    Showers
    Likely then
    Showers

  • Thursday Night

    Thursday Night: Showers likely, mainly before 1am. Cloudy, with a low around 45. Breezy, with a north northeast wind 5 to 10 mph becoming northwest 15 to 20 mph after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 45 °F

    Showers
    Likely and
    Breezy

  • Friday

    Friday: A 50 percent chance of showers, mainly after 7am. Mostly cloudy, with a high near 53. Breezy, with a west northwest wind around 20 mph, with gusts as high as 30 mph.

    High: 53 °F

    Chance
    Showers and
    Breezy

  • Friday Night

    Friday Night: Widespread frost, mainly after 5am. Otherwise, mostly clear, with a low around 32. Breezy, with a north wind 15 to 20 mph decreasing to 5 to 10 mph after midnight.

    Low: 32 °F

    Partly Cloudy
    and Breezy
    then Frost

  • Saturday

    Saturday: Widespread frost, mainly before 8am. Otherwise, sunny, with a high near 57.

    High: 57 °F

    Frost then
    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 36.

    Low: 36 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 63.

    High: 63 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 52. East northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Thursday
Showers, mainly after 10am. High near 58. East wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.
Thursday Night
Showers likely, mainly before 1am. Cloudy, with a low around 45. Breezy, with a north northeast wind 5 to 10 mph becoming northwest 15 to 20 mph after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
A 50 percent chance of showers, mainly after 7am. Mostly cloudy, with a high near 53. Breezy, with a west northwest wind around 20 mph, with gusts as high as 30 mph.
Friday Night
Widespread frost, mainly after 5am. Otherwise, mostly clear, with a low around 32. Breezy, with a north wind 15 to 20 mph decreasing to 5 to 10 mph after midnight.
Saturday
Widespread frost, mainly before 8am. Otherwise, sunny, with a high near 57.
Saturday Night
Clear, with a low around 36.
Sunday
Sunny, with a high near 63.
Sunday Night
Mostly clear, with a low around 41.
Monday
Mostly sunny, with a high near 66.
Monday Night
Partly cloudy, with a low around 42.
Tuesday
Sunny, with a high near 70.
Tuesday Night
Mostly clear, with a low around 47.
Wednesday
Sunny, with a high near 72.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.47°N 89.02°W
Last Update:
9:36 pm CDT Oct 14, 2026
Forecast Valid:
9pm CDT Oct 14, 2026-6pm CDT Oct 21, 2026
 
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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