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.

Thunderstorm Heavy Rain Fog/Mist

61°F

16°C

Humidity 97%
Wind Speed NW 12 G 21 mph
Barometer 29.74 in (1006.2 mb)
Dewpoint 60°F (16°C)
Visibility 1.50 mi
Last update 15 Apr 3:51 am CDT
Extended Forecast for

Winthrop Harbor IL

  • Overnight

    Overnight: Showers and possibly a thunderstorm. Patchy fog after 5am. Low around 53. South wind around 10 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 53 °F

    Showers and
    Patchy Fog

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm before 10am, then a chance of showers and thunderstorms between 10am and 4pm, then showers likely and possibly a thunderstorm after 4pm. Patchy fog before 9am. High near 69. Southwest wind around 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 69 °F

    Showers and
    Patchy Fog

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm, mainly before 3am, then a chance of showers and thunderstorms after 3am. Low around 50. South wind 5 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 50 °F

    Showers

  • Thursday

    Thursday: A chance of showers and thunderstorms before 7am, then showers likely and possibly a thunderstorm between 7am and 4pm, then showers likely after 4pm. Mostly cloudy, with a high near 64. Southwest wind 5 to 10 mph becoming northwest in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 64 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 46. Northeast wind around 5 mph becoming south after midnight.

    Low: 46 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 67. Southeast wind 5 to 10 mph.

    High: 67 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Showers likely, then showers and possibly a thunderstorm after 10pm. Low around 48. Southeast wind around 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 48 °F

    Showers

  • Saturday

    Saturday: A chance of showers and thunderstorms. Partly sunny, with a high near 62. West wind 10 to 15 mph. Chance of precipitation is 40%.

    High: 62 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers before 1am. Partly cloudy, with a low around 35.

    Low: 35 °F

    Slight Chance
    Showers

Detailed Forecast

Overnight
Showers and possibly a thunderstorm. Patchy fog after 5am. Low around 53. South wind around 10 mph. Chance of precipitation is 80%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
Showers and possibly a thunderstorm before 10am, then a chance of showers and thunderstorms between 10am and 4pm, then showers likely and possibly a thunderstorm after 4pm. Patchy fog before 9am. High near 69. Southwest wind around 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night
Showers and possibly a thunderstorm, mainly before 3am, then a chance of showers and thunderstorms after 3am. Low around 50. South wind 5 to 10 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Thursday
A chance of showers and thunderstorms before 7am, then showers likely and possibly a thunderstorm between 7am and 4pm, then showers likely after 4pm. Mostly cloudy, with a high near 64. Southwest wind 5 to 10 mph becoming northwest in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
Mostly cloudy, with a low around 46. Northeast wind around 5 mph becoming south after midnight.
Friday
Mostly cloudy, with a high near 67. Southeast wind 5 to 10 mph.
Friday Night
Showers likely, then showers and possibly a thunderstorm after 10pm. Low around 48. Southeast wind around 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 62. West wind 10 to 15 mph. Chance of precipitation is 40%.
Saturday Night
A 20 percent chance of showers before 1am. Partly cloudy, with a low around 35.
Sunday
Mostly sunny, with a high near 50.
Sunday Night
Partly cloudy, with a low around 34.
Monday
Sunny, with a high near 55.
Monday Night
Partly cloudy, with a low around 45.
Tuesday
Mostly sunny, with a high near 66.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Winthrop Harbor IL
 42.49°N 87.81°W (Elev. 600 ft)
Last Update:
3:41 am CDT Apr 15, 2026
Forecast Valid:
4am CDT Apr 15, 2026-6pm CDT Apr 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