Chicago Nearshore Marine Forecasts by Zone

 
 

 
 
 
 
 
FORECAST For Wilmette Harbor to Northerly Island (LMZ741)
 
 
 
 
 LMZ740>742-252230-
 Winthrop Harbor to Wilmette Harbor IL-
 Wilmette Harbor to Northerly Island IL-
 Northerly Island to Calumet Harbor IL-
 946 AM CST Tue Nov 25 2025
 
 GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH THURSDAY
 EVENING
 

 REST OF TODAY
 Southwest winds 5 to 10 kt. Areas of fog late in
 the morning. Occasional drizzle late in the morning. Waves around
 1 ft.

 TONIGHT
 Southwest winds 15 to 25 kt increasing to 35 kt gales
 overnight. Rain showers likely in the evening, then chance of
 showers after midnight. Waves around 1 to 3 ft building to 3 to 5
 ft.

 WEDNESDAY
 West gales to 45 kt. A few storm force gusts to 50
 kt possible. Snow showers likely. Waves 4 to 7 ft occasionally to
 9 ft.

 WEDNESDAY NIGHT
 West gales to 40 kt. Mostly cloudy. Waves 4 to
 7 ft occasionally to 9 ft.
 
 $$