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.

Mostly Cloudy

48°F

9°C

Humidity 66%
Wind Speed E 8 mph
Barometer 30.18 in
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 22 May 2:35 am CDT
Extended Forecast for

South Beloit IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 45. East wind around 10 mph, with gusts as high as 15 mph.

    Low: 45 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 66. East wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 66 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 52. East wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 52 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 71. East wind around 5 mph, with gusts as high as 10 mph.

    High: 71 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 40 percent chance of showers after 1am. Mostly cloudy, with a low around 53. East southeast wind around 5 mph becoming calm in the evening.

    Low: 53 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: A 30 percent chance of showers before 1pm. Partly sunny, with a high near 78.

    High: 78 °F

    Chance
    Showers

  • Sunday Night

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

    Low: 53 °F

    Mostly Clear

  • Memorial Day

    Memorial Day: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 45. East wind around 10 mph, with gusts as high as 15 mph.
Friday
Mostly cloudy, with a high near 66. East wind 10 to 15 mph, with gusts as high as 25 mph.
Friday Night
Mostly cloudy, with a low around 52. East wind 5 to 10 mph, with gusts as high as 20 mph.
Saturday
Partly sunny, with a high near 71. East wind around 5 mph, with gusts as high as 10 mph.
Saturday Night
A 40 percent chance of showers after 1am. Mostly cloudy, with a low around 53. East southeast wind around 5 mph becoming calm in the evening.
Sunday
A 30 percent chance of showers before 1pm. Partly sunny, with a high near 78.
Sunday Night
Mostly clear, with a low around 53.
Memorial Day
Sunny, with a high near 84.
Monday Night
Mostly clear, with a low around 58.
Tuesday
Mostly sunny, with a high near 86.
Tuesday Night
Partly cloudy, with a low around 60.
Wednesday
Mostly sunny, with a high near 86.
Wednesday Night
Partly cloudy, with a low around 60.
Thursday
A chance of showers. Mostly sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.49°N 89.02°W
Last Update:
1:21 am CDT May 22, 2026
Forecast Valid:
2am CDT May 22, 2026-6pm CDT May 28, 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