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

41°F

5°C

Humidity 76%
Wind Speed Calm
Barometer 30.37 in
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Last update 10 Apr 9:50 pm CDT
Extended Forecast for

Alden IL

  • Tonight

    Tonight: Patchy fog after 2am. Otherwise, mostly clear, with a low around 33. East northeast wind around 5 mph becoming calm after midnight.

    Low: 33 °F

    Mostly Clear
    then Patchy
    Fog

  • Saturday

    Saturday: A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Patchy fog before 8am. Otherwise, increasing clouds, with a high near 52. Light east southeast wind becoming southeast 5 to 10 mph in the morning. Winds could gust as high as 15 mph. Chance of precipitation is 20%.

    High: 52 °F

    Patchy Fog
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a temperature falling to near 47 by 8pm, then rising to around 53 during the remainder of the night. Southeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.

    Low: 47 °F⇑

    Chance
    Showers

  • Sunday

    Sunday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 72. Breezy, with a south southwest wind 15 to 25 mph, with gusts as high as 35 mph. Chance of precipitation is 60%.

    High: 72 °F

    Breezy.
    Chance
    Showers then
    Showers
    Likely

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Cloudy, with a low around 60. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 70%.

    Low: 60 °F

    Showers
    Likely and
    Breezy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 76.

    High: 76 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 62.

    Low: 62 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 79.

    High: 79 °F

    Mostly Cloudy
    then Showers
    Likely

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 60.

    Low: 60 °F

    Showers

Detailed Forecast

Tonight
Patchy fog after 2am. Otherwise, mostly clear, with a low around 33. East northeast wind around 5 mph becoming calm after midnight.
Saturday
A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Patchy fog before 8am. Otherwise, increasing clouds, with a high near 52. Light east southeast wind becoming southeast 5 to 10 mph in the morning. Winds could gust as high as 15 mph. Chance of precipitation is 20%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a temperature falling to near 47 by 8pm, then rising to around 53 during the remainder of the night. Southeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
Sunday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 72. Breezy, with a south southwest wind 15 to 25 mph, with gusts as high as 35 mph. Chance of precipitation is 60%.
Sunday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms between 1am and 4am, then a chance of showers after 4am. Cloudy, with a low around 60. Breezy, with a south southwest wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 70%.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 76.
Monday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 62.
Tuesday
Showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 79.
Tuesday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 60.
Wednesday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 72.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 52.
Thursday
A chance of showers. Partly sunny, with a high near 74.
Thursday Night
A chance of showers. Partly cloudy, with a low around 53.
Friday
A chance of showers. Mostly sunny, with a high near 72.
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ABOUT THIS FORECAST

 
Point Forecast:
Alden IL
 42.46°N 88.52°W
Last Update:
9:41 pm CDT Apr 10, 2026
Forecast Valid:
10pm CDT Apr 10, 2026-6pm CDT Apr 17, 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