National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Overcast

54°F

12°C

Humidity 44%
Wind Speed E 16 mph
Barometer 30.31 in
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Wind Chill50°F (10°C)
Last update 21 May 11:45 am CDT
Extended Forecast for

South Beloit IL

  • Today

    Today: A slight chance of sprinkles before 1pm. Mostly cloudy, with a high near 60. East wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 60 °F

    Slight Chance
    Sprinkles

  • Tonight

    Tonight: Mostly cloudy, with a low around 45. East northeast wind 10 to 15 mph.

    Low: 45 °F

    Mostly Cloudy

  • Friday

    Friday: A 20 percent chance of showers after 1pm. Partly sunny, with a high near 65. East wind around 15 mph, with gusts as high as 25 mph.

    High: 65 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: A 50 percent chance of showers. Cloudy, with a low around 50. East wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 50 °F

    Chance
    Showers

  • Saturday

    Saturday: A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 72. Northeast wind around 10 mph becoming west northwest in the afternoon.

    High: 72 °F

    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 52.

    Low: 52 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 78.

    High: 78 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 53.

    Low: 53 °F

    Mostly Clear

  • Memorial Day

    Memorial Day: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

Detailed Forecast

Today
A slight chance of sprinkles before 1pm. Mostly cloudy, with a high near 60. East wind 10 to 15 mph, with gusts as high as 20 mph.
Tonight
Mostly cloudy, with a low around 45. East northeast wind 10 to 15 mph.
Friday
A 20 percent chance of showers after 1pm. Partly sunny, with a high near 65. East wind around 15 mph, with gusts as high as 25 mph.
Friday Night
A 50 percent chance of showers. Cloudy, with a low around 50. East wind 10 to 15 mph, with gusts as high as 25 mph.
Saturday
A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 72. Northeast wind around 10 mph becoming west northwest in the afternoon.
Saturday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 52.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 78.
Sunday Night
Mostly clear, with a low around 53.
Memorial Day
Mostly sunny, with a high near 82.
Monday Night
Partly cloudy, with a low around 56.
Tuesday
Mostly sunny, with a high near 84.
Tuesday Night
A chance of showers. Partly cloudy, with a low around 59.
Wednesday
A chance of showers. Partly sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.5°N 89.05°W
Last Update:
10:11 am CDT May 21, 2026
Forecast Valid:
11am CDT May 21, 2026-6pm CDT May 27, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation