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.

Light Rain

39°F

4°C

Humidity 89%
Wind Speed E 3 mph
Barometer 29.96 in (1015.1 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 1 May 2:51 am CDT
Extended Forecast for

Winthrop Harbor IL

Frost Advisory May 2, 12:00am until May 2, 08:00am
Click here for hazard details and duration
Frost Advisory

  • Overnight

    Overnight: Showers likely before 4am. Mostly cloudy, with a low around 37. North wind around 5 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 37 °F

    Showers
    Likely

  • Friday

    Friday: Partly sunny, with a high near 45. North wind 5 to 10 mph becoming northeast in the afternoon.

    High: 45 °F

    Partly Sunny

  • Friday Night

    Friday Night: A 10 percent chance of showers before 7pm. Areas of frost after midnight. Otherwise, partly cloudy, with a low around 34. East wind around 5 mph becoming calm.

    Low: 34 °F

    Slight Chance
    Showers then
    Areas Frost

  • Saturday

    Saturday: Areas of frost before 8am. Otherwise, mostly sunny, with a high near 48. North wind around 5 mph becoming southeast in the afternoon.

    High: 48 °F

    Areas Frost
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 41. Southwest wind 5 to 10 mph.

    Low: 41 °F

    Partly Cloudy

  • Sunday

    Sunday: A 30 percent chance of showers, mainly before 1pm. Partly sunny, with a high near 61. Southwest wind 10 to 15 mph.

    High: 61 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 46. Southwest wind 5 to 10 mph.

    Low: 46 °F

    Partly Cloudy

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 68. Southwest wind 5 to 15 mph.

    High: 68 °F

    Mostly Sunny
    then Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 44. Chance of precipitation is 40%.

    Low: 44 °F

    Chance
    Showers

Detailed Forecast

Overnight
Showers likely before 4am. Mostly cloudy, with a low around 37. North wind around 5 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Partly sunny, with a high near 45. North wind 5 to 10 mph becoming northeast in the afternoon.
Friday Night
A 10 percent chance of showers before 7pm. Areas of frost after midnight. Otherwise, partly cloudy, with a low around 34. East wind around 5 mph becoming calm.
Saturday
Areas of frost before 8am. Otherwise, mostly sunny, with a high near 48. North wind around 5 mph becoming southeast in the afternoon.
Saturday Night
Partly cloudy, with a low around 41. Southwest wind 5 to 10 mph.
Sunday
A 30 percent chance of showers, mainly before 1pm. Partly sunny, with a high near 61. Southwest wind 10 to 15 mph.
Sunday Night
Partly cloudy, with a low around 46. Southwest wind 5 to 10 mph.
Monday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 68. Southwest wind 5 to 15 mph.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 44. Chance of precipitation is 40%.
Tuesday
A 30 percent chance of showers. Partly sunny, with a high near 57.
Tuesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 42.
Wednesday
A 20 percent chance of showers. Partly sunny, with a high near 54.
Wednesday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 39.
Thursday
Mostly sunny, with a high near 55.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Winthrop Harbor IL
 42.49°N 87.81°W (Elev. 600 ft)
Last Update:
2:56 am CDT May 1, 2026
Forecast Valid:
3am CDT May 1, 2026-6pm CDT May 7, 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