National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fair

62°F

17°C

Humidity 90%
Wind Speed SW 13 mph
Barometer 29.60 in (1001.6 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 18 Apr 12:51 am CDT
Extended Forecast for

Third Lake IL

Flood Watch April 18, 01:19am until April 18, 05:00am
Flash Flood Warning April 18, 01:19am until April 18, 02:00am
Click here for hazard details and duration
Flood Watch
...
  •  
    Flood Watch April 18, 01:19am until April 18, 05:00am
    Flash Flood Warning April 18, 01:19am until April 18, 02:00am

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Overnight

    Low: 42 °F

    Showers and
    Breezy

  • Saturday

    Saturday: Cloudy, then gradually becoming mostly sunny, with a steady temperature around 46. Breezy, with a west wind around 20 mph, with gusts as high as 30 mph.

    High: 46 °F

    Decreasing
    Clouds and
    Breezy

  • Saturday Night

    Saturday Night: Widespread frost, mainly after 5am. Otherwise, mostly clear, with a low around 33. West wind 5 to 15 mph, with gusts as high as 25 mph.

    Low: 33 °F

    Mostly Clear
    then Frost

  • Sunday

    Sunday: A 20 percent chance of showers after 1pm. Widespread frost before 7am. Otherwise, mostly sunny, with a high near 49. West southwest wind 5 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 25 mph.

    High: 49 °F

    Frost then
    Slight Chance
    Showers

  • Sunday Night

    Sunday Night: Widespread frost after 1am. Otherwise, partly cloudy, with a low around 31. North northwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 15 mph.

    Low: 31 °F

    Partly Cloudy
    then Frost

  • Monday

    Monday: Widespread frost before 8am. Otherwise, sunny, with a high near 52.

    High: 52 °F

    Frost then
    Mostly 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

Detailed Forecast

Overnight
Showers, mainly before 3am. Low around 42. Breezy, with a southwest wind 15 to 20 mph becoming west northwest. Winds could gust as high as 30 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Cloudy, then gradually becoming mostly sunny, with a steady temperature around 46. Breezy, with a west wind around 20 mph, with gusts as high as 30 mph.
Saturday Night
Widespread frost, mainly after 5am. Otherwise, mostly clear, with a low around 33. West wind 5 to 15 mph, with gusts as high as 25 mph.
Sunday
A 20 percent chance of showers after 1pm. Widespread frost before 7am. Otherwise, mostly sunny, with a high near 49. West southwest wind 5 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 25 mph.
Sunday Night
Widespread frost after 1am. Otherwise, partly cloudy, with a low around 31. North northwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 15 mph.
Monday
Widespread frost before 8am. Otherwise, sunny, with a high near 52.
Monday Night
Mostly cloudy, with a low around 41.
Tuesday
Mostly sunny, with a high near 70.
Tuesday Night
Partly cloudy, with a low around 45.
Wednesday
Sunny, with a high near 63.
Wednesday Night
Partly cloudy, with a low around 49.
Thursday
Mostly sunny, with a high near 75.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 57.
Friday
A chance of showers. Mostly cloudy, with a high near 72.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Third Lake IL
 42.37°N 87.99°W
Last Update:
12:17 am CDT Apr 18, 2026
Forecast Valid:
1am CDT Apr 18, 2026-6pm CDT Apr 24, 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