Chicago Nearshore Marine Forecasts by Zone

 
 

 
 
 
 
 
FORECAST For Wilmette Harbor to Northerly Island (LMZ741)
 
 
 
 
 LMZ740>742-222130-
 Winthrop Harbor to Wilmette Harbor IL-
 Wilmette Harbor to Northerly Island IL-
 Northerly Island to Calumet Harbor IL-
 1001 AM CDT Wed Jul 22 2026
 
 SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS EVENING
 

 REST OF TODAY
 North winds 15 to 25 kt becoming northeast 10 to
 15 kt in the afternoon. Partly cloudy late in the morning then
 clearing. Waves 4 to 6 ft occasionally to 8 ft.

 TONIGHT
 Northeast winds 10 to 15 kt becoming northwest around 5
 kt overnight. Mostly clear. Waves 3 to 6 ft occasionally to 8 ft
 subsiding to 1 to 3 ft.

 THURSDAY
 West winds around 10 kt becoming southeast in the
 afternoon. Mostly sunny. Waves 1 to 2 ft.

 THURSDAY NIGHT
 Southeast winds around 10 kt becoming south
 overnight. Increasing cloudiness. Waves 1 to 2 ft.
 
 $$