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

34°F

1°C

Humidity 87%
Wind Speed E 18 G 22 mph
Barometer 29.70 in
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Wind Chill23°F (-5°C)
Last update 15 Mar 4:15 am CDT
Extended Forecast for

South Beloit IL

Winter Storm Watch March 15, 10:00pm until March 16, 07:00pm
Click here for hazard details and duration
Winter Storm Watch

  • Overnight

    Overnight: A 30 percent chance of showers. Cloudy, with a steady temperature around 36. East southeast wind around 15 mph, with gusts as high as 25 mph.

    Low: 36 °F

    Chance
    Showers

  • Sunday

    Sunday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 10am. High near 55. Breezy, with a southeast wind 15 to 25 mph becoming south southwest in the afternoon. Winds could gust as high as 35 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 55 °F

    Showers and
    Breezy

  • Sunday Night

    Sunday Night: Rain showers, snow showers, and sleet before midnight, then snow showers, possibly mixed with sleet between midnight and 1am, then snow showers after 1am. The snow could be heavy at times. Some thunder is also possible. Widespread blowing snow, mainly after 4am. Low around 18. Windy, with a north northwest wind 20 to 30 mph, with gusts as high as 45 mph. Chance of precipitation is 100%. New snow and sleet accumulation of 3 to 5 inches possible.

    Low: 18 °F

    Wintry Mix
    and Blowing
    Snow

  • Monday

    Monday: Snow showers likely, mainly before 1pm. Widespread blowing snow, mainly before 7am. Cloudy, with a high near 20. Wind chill values as low as -1. Windy, with a northwest wind 25 to 30 mph, with gusts as high as 45 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 2 inches possible.

    High: 20 °F

    Snow Showers
    Likely and
    Blowing Snow

  • Monday Night

    Monday Night: Patchy blowing snow before 7pm. Mostly cloudy, with a low around 5. Blustery, with a west northwest wind 10 to 20 mph, with gusts as high as 30 mph.

    Low: 5 °F

    Patchy
    Blowing Snow
    and Blustery
    then Partly
    Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 23.

    High: 23 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Snow showers. Low around 16. Chance of precipitation is 80%.

    Low: 16 °F

    Snow Showers

  • Wednesday

    Wednesday: Partly sunny, with a high near 42.

    High: 42 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 31.

    Low: 31 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A 30 percent chance of showers. Cloudy, with a steady temperature around 36. East southeast wind around 15 mph, with gusts as high as 25 mph.
Sunday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 10am. High near 55. Breezy, with a southeast wind 15 to 25 mph becoming south southwest in the afternoon. Winds could gust as high as 35 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Sunday Night
Rain showers, snow showers, and sleet before midnight, then snow showers, possibly mixed with sleet between midnight and 1am, then snow showers after 1am. The snow could be heavy at times. Some thunder is also possible. Widespread blowing snow, mainly after 4am. Low around 18. Windy, with a north northwest wind 20 to 30 mph, with gusts as high as 45 mph. Chance of precipitation is 100%. New snow and sleet accumulation of 3 to 5 inches possible.
Monday
Snow showers likely, mainly before 1pm. Widespread blowing snow, mainly before 7am. Cloudy, with a high near 20. Wind chill values as low as -1. Windy, with a northwest wind 25 to 30 mph, with gusts as high as 45 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 2 inches possible.
Monday Night
Patchy blowing snow before 7pm. Mostly cloudy, with a low around 5. Blustery, with a west northwest wind 10 to 20 mph, with gusts as high as 30 mph.
Tuesday
Mostly sunny, with a high near 23.
Tuesday Night
Snow showers. Low around 16. Chance of precipitation is 80%.
Wednesday
Partly sunny, with a high near 42.
Wednesday Night
Mostly cloudy, with a low around 31.
Thursday
Mostly sunny, with a high near 49.
Thursday Night
Mostly cloudy, with a low around 34.
Friday
Mostly cloudy, with a high near 56.
Friday Night
Mostly cloudy, with a low around 34.
Saturday
Mostly sunny, with a high near 50.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
South Beloit IL
 42.5°N 89.05°W
Last Update:
4:31 am CDT Mar 15, 2026
Forecast Valid:
4am CDT Mar 15, 2026-6pm CDT Mar 21, 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