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

43°F

6°C

Humidity 76%
Wind Speed NW 17 G 28 mph
Barometer 29.77 in
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 18 Apr 6:45 am CDT
Extended Forecast for

Alden IL

Flood Warning until April 18, 08:00am
Click here for hazard details and duration
...
  •  
    Flood Warning until April 18, 08:00am

    NOW until 8:00am Sat

    Flood Warning

  • Today

    High: 47 °F

    Partly Sunny
    and Breezy

  • Tonight

    Tonight: Widespread frost, mainly after 2am. Otherwise, mostly clear, with a low around 31. West southwest wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 31 °F

    Mostly Clear
    then Frost

  • Sunday

    Sunday: A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 47. West southwest wind 5 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph.

    High: 47 °F

    Mostly Sunny
    then Chance
    Showers

  • Sunday Night

    Sunday Night: Widespread frost after midnight. Otherwise, mostly clear, with a low around 28. Northwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.

    Low: 28 °F

    Mostly Clear
    then Frost

  • Monday

    Monday: Widespread frost before 9am. Otherwise, sunny, with a high near 52. Light and variable wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 15 mph.

    High: 52 °F

    Frost then
    Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 70.

    High: 70 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 45.

    Low: 45 °F

    Mostly Clear

Detailed Forecast

Today
Partly sunny, with a high near 47. Breezy, with a west wind around 20 mph, with gusts as high as 30 mph.
Tonight
Widespread frost, mainly after 2am. Otherwise, mostly clear, with a low around 31. West southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Sunday
A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 47. West southwest wind 5 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph.
Sunday Night
Widespread frost after midnight. Otherwise, mostly clear, with a low around 28. Northwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.
Monday
Widespread frost before 9am. Otherwise, sunny, with a high near 52. Light and variable wind becoming south 5 to 10 mph in the morning. Winds could gust as high as 15 mph.
Monday Night
Mostly cloudy, with a low around 41.
Tuesday
Mostly sunny, with a high near 70.
Tuesday Night
Mostly clear, with a low around 45.
Wednesday
Sunny, with a high near 70.
Wednesday Night
Mostly clear, with a low around 51.
Thursday
Mostly sunny, with a high near 78.
Thursday Night
Showers likely. Mostly cloudy, with a low around 58.
Friday
A chance of showers. Mostly cloudy, with a high near 70.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Alden IL
 42.46°N 88.52°W
Last Update:
6:46 am CDT Apr 18, 2026
Forecast Valid:
7am CDT Apr 18, 2026-6pm CDT Apr 24, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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