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.

Partly Cloudy

61°F

16°C

Humidity 77%
Wind Speed SE 10 mph
Barometer 30.00 in
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 23 May 10:15 pm CDT
Extended Forecast for

South Beloit IL

  • Tonight

    Tonight: A chance of showers and thunderstorms before 4am, then a slight chance of showers. Cloudy, with a low around 55. East southeast wind around 5 mph becoming calm after midnight. Chance of precipitation is 30%.

    Low: 55 °F

    Chance
    Showers

  • Sunday

    Sunday: Mostly cloudy through mid morning, then gradual clearing, with a high near 80. Calm wind becoming west around 5 mph in the morning. Winds could gust as high as 10 mph.

    High: 80 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 55. West southwest wind around 5 mph becoming calm.

    Low: 55 °F

    Clear

  • Memorial Day

    Memorial Day: Sunny, with a high near 85. Light south wind becoming south southwest 5 to 10 mph in the morning.

    High: 85 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 59. South wind around 5 mph becoming calm in the evening. Winds could gust as high as 10 mph.

    Low: 59 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 62.

    Low: 62 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers. Partly sunny, with a high near 83.

    High: 83 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 59.

    Low: 59 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A chance of showers and thunderstorms before 4am, then a slight chance of showers. Cloudy, with a low around 55. East southeast wind around 5 mph becoming calm after midnight. Chance of precipitation is 30%.
Sunday
Mostly cloudy through mid morning, then gradual clearing, with a high near 80. Calm wind becoming west around 5 mph in the morning. Winds could gust as high as 10 mph.
Sunday Night
Clear, with a low around 55. West southwest wind around 5 mph becoming calm.
Memorial Day
Sunny, with a high near 85. Light south wind becoming south southwest 5 to 10 mph in the morning.
Monday Night
Mostly clear, with a low around 59. South wind around 5 mph becoming calm in the evening. Winds could gust as high as 10 mph.
Tuesday
Mostly sunny, with a high near 86.
Tuesday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 62.
Wednesday
A chance of showers. Partly sunny, with a high near 83.
Wednesday Night
Mostly cloudy, with a low around 59.
Thursday
Partly sunny, with a high near 82.
Thursday Night
Mostly cloudy, with a low around 54.
Friday
Mostly sunny, with a high near 76.
Friday Night
Partly cloudy, with a low around 52.
Saturday
Mostly sunny, with a high near 77.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.5°N 89.05°W
Last Update:
9:06 pm CDT May 23, 2026
Forecast Valid:
10pm CDT May 23, 2026-6pm CDT May 30, 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