Chicago Nearshore Marine Forecasts by Zone

 
 

 
 
 
 
 
FORECAST For Wilmette Harbor to Northerly Island (LMZ741)
 
 
 
 
 LMZ740>743-152215-
 Winthrop Harbor to Wilmette Harbor IL-
 Wilmette Harbor to Northerly Island IL-
 Northerly Island to Calumet Harbor IL-
 Calumet Harbor IL to Gary IN-
 938 AM CST Mon Dec 15 2025
 
 SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 PM CST THIS AFTERNOON
 

 REST OF TODAY
 Southwest winds to 30 kt this morning diminishing
 to 15 to 25 kt this afternoon. Mostly cloudy. Waves 3 to 5 ft
 subsiding to 1 to 3 ft.

 TONIGHT
 Southwest winds 10 to 15 kt in the evening diminishing
 to around 10 kt overnight. Partly cloudy. Waves 1 to 2 ft.

 TUESDAY
 Southwest winds 10 to 20 kt increasing to 20 to 25 kt.
 Mostly cloudy in the morning, then becoming partly cloudy. Waves
 1 to 3 ft building to 2 to 4 ft.

 TUESDAY NIGHT
 Southwest winds 20 to 25 kt becoming west 15 to
 20 kt overnight. Mostly cloudy. Waves 3 to 5 ft subsiding to 2 to
 4 ft.
 
 $$