Chicago Nearshore Marine Forecasts by Zone

 
 

 
 
 
 
 
FORECAST For Wilmette Harbor to Northerly Island (LMZ741)
 
 
 
 
 LMZ740>742-130930-
 Winthrop Harbor to Wilmette Harbor IL-
 Wilmette Harbor to Northerly Island IL-
 Northerly Island to Calumet Harbor IL-
 949 PM CDT Tue May 12 2026
 
 SMALL CRAFT ADVISORY IN EFFECT THROUGH WEDNESDAY EVENING
 

 REST OF TONIGHT
 West winds 20 to 25 kt becoming northwest
 late. Partly cloudy late in the evening then clearing. Waves 2 to
 4 ft.

 WEDNESDAY
 Northwest winds 20 to 25 kt becoming northeast 15 to
 20 kt. Mostly cloudy. Waves 2 to 4 ft.

 WEDNESDAY NIGHT
 North winds 10 to 15 kt becoming northwest.
 Decreasing cloud cover. Waves 1 to 3 ft.

 THURSDAY
 North winds around 10 kt becoming east in the
 afternoon. Sunny. Waves 1 to 2 ft.
 
 $$