Chicago Nearshore Marine Forecasts by Zone

 
 

 
 
 
 
 
FORECAST For Wilmette Harbor to Northerly Island (LMZ741)
 
 
 
 
 LMZ740>742-111515-
 Winthrop Harbor to Wilmette Harbor IL-
 Wilmette Harbor to Northerly Island IL-
 Northerly Island to Calumet Harbor IL-
 314 AM CDT Sat Oct 11 2025
 
 SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM CDT THIS MORNING
 

 TODAY
 Northeast winds 15 to 25 kt diminishing to 10 to 15 kt.
 Partly cloudy in the morning, then becoming mostly cloudy. Waves
 3 to 6 ft subsiding to 2 to 4 ft.

 TONIGHT
 Northeast winds 10 to 15 kt becoming southeast
 overnight. Partly cloudy in the evening then clearing. Waves 2 to
 4 ft.

 SUNDAY
 Southeast winds 10 to 15 kt. Mostly sunny. Waves 2 to 4
 ft.

 SUNDAY NIGHT
 Southeast winds 10 to 15 kt. Mostly clear in the
 evening, then becoming partly cloudy. Waves 2 to 4 ft.
 
 $$