Chicago Nearshore Marine Forecasts by Zone

 
 

 
 
 
 
 
FORECAST For Wilmette Harbor to Northerly Island (LMZ741)
 
 
 
 
 LMZ740>742-200915-
 Winthrop Harbor to Wilmette Harbor IL-
 Wilmette Harbor to Northerly Island IL-
 Northerly Island to Calumet Harbor IL-
 919 PM CDT Sun Apr 19 2026
 

 REST OF TONIGHT
 Northeast winds around 10 kt. Partly cloudy
 late in the evening then clearing. Waves 1 to 3 ft.

 MONDAY
 East winds 10 to 15 kt becoming southeast in the
 afternoon. Mostly sunny. Waves 1 to 3 ft.

 MONDAY NIGHT
 Southeast winds 10 to 15 kt becoming south 15 to
 20 kt overnight. Mostly cloudy. Waves building to 2 to 4 ft.

 TUESDAY
 Southwest winds 10 to 20 kt. Partly cloudy. Waves 2 to
 4 ft subsiding to 1 to 2 ft.
 
 $$