Chicago Nearshore Marine Forecasts by Zone

 
 

 
 
 
 
 
FORECAST For Wilmette Harbor to Northerly Island (LMZ741)
 
 
 
 
 LMZ740>742-050915-
 Winthrop Harbor to Wilmette Harbor IL-
 Wilmette Harbor to Northerly Island IL-
 Northerly Island to Calumet Harbor IL-
 906 PM CDT Fri Sep 4 2026
 

 REST OF TONIGHT
 North winds around 10 kt becoming northeast.
 Chance of showers and thunderstorms. Patchy fog after midnight.
 Waves 1 to 2 ft.

 SATURDAY
 North winds around 10 kt increasing to 15 to 20 kt.
 Patchy fog in the morning. Waves 1 to 2 ft building to 2 to 4 ft.

 SATURDAY NIGHT
 Northeast winds 10 to 20 kt becoming east 10 to
 15 kt overnight. Partly cloudy in the evening then clearing.
 Waves 2 to 4 ft.

 SUNDAY
 East winds 10 to 15 kt becoming northeast. Mostly
 sunny. Waves 2 to 4 ft subsiding to 1 to 3 ft.
 
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