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

66°F

19°C

Humidity 52%
Wind Speed SW 8 mph
Barometer 29.87 in
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 14 Nov 1:45 pm CST
Extended Forecast for

South Beloit IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 65. South wind 5 to 10 mph.

    High: 65 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 54. South southwest wind 5 to 15 mph, with gusts as high as 20 mph.

    Low: 54 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Mostly cloudy through mid morning, then gradual clearing, with a high near 67. Southwest wind 10 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph.

    High: 67 °F

    Becoming
    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 31. Northwest wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 31 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 47. Northwest wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 47 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 25.

    Low: 25 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 45.

    High: 45 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Rain likely, mainly after midnight. Mostly cloudy, with a low around 31.

    Low: 31 °F

    Rain Likely

  • Tuesday

    Tuesday: A chance of rain before noon. Partly sunny, with a high near 43.

    High: 43 °F

    Chance Rain
    then Mostly
    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 65. South wind 5 to 10 mph.
Tonight
Increasing clouds, with a low around 54. South southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Saturday
Mostly cloudy through mid morning, then gradual clearing, with a high near 67. Southwest wind 10 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph.
Saturday Night
Mostly clear, with a low around 31. Northwest wind 10 to 15 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 47. Northwest wind 10 to 15 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 25.
Monday
Mostly sunny, with a high near 45.
Monday Night
Rain likely, mainly after midnight. Mostly cloudy, with a low around 31.
Tuesday
A chance of rain before noon. Partly sunny, with a high near 43.
Tuesday Night
Mostly cloudy, with a low around 28.
Wednesday
Partly sunny, with a high near 46.
Wednesday Night
A chance of rain. Mostly cloudy, with a low around 34.
Thursday
Rain likely. Mostly cloudy, with a high near 49.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.49°N 89.02°W
Last Update:
1:31 pm CST Nov 14, 2025
Forecast Valid:
2pm CST Nov 14, 2025-6pm CST Nov 20, 2025
 
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