Chicago Nearshore Marine Forecasts by Zone

 
 

 
 
 
 
 
FORECAST For Wilmette Harbor to Northerly Island (LMZ741)
 
 
 
 
 LMZ740>742-101800-
 Winthrop Harbor to Wilmette Harbor IL-
 Wilmette Harbor to Northerly Island IL-
 Northerly Island to Calumet Harbor IL-
 402 AM CDT Fri Jul 10 2026
 

 TODAY
 North winds 5 to 10 kt increasing to 10 to 15 kt in the
 afternoon. Patchy fog in the morning. Waves 1 to 2 ft.

 TONIGHT
 North winds 10 to 15 kt. Mostly cloudy. Waves 1 to
 3 ft.

 SATURDAY
 Northeast winds 10 to 15 kt. Partly cloudy. Waves
 1 to 2 ft.

 SATURDAY NIGHT
 Northeast winds 10 to 15 kt in the evening.
 Partly cloudy in the evening, then becoming mostly clear. Waves
 1 to 2 ft.
 
 $$