Chicago Nearshore Marine Forecasts by Zone

 
 

 
 
 
 
 
FORECAST For Wilmette Harbor to Northerly Island (LMZ741)
 
 
 
 
 LMZ740>743-191515-
 Winthrop Harbor to Wilmette Harbor IL-
 Wilmette Harbor to Northerly Island IL-
 Northerly Island to Calumet Harbor IL-
 Calumet Harbor IL to Gary IN-
 256 AM CDT Sun Oct 19 2025
 
 GALE WARNING IN EFFECT FROM 7 AM CDT THIS MORNING THROUGH THIS
 EVENING
 

 TODAY
 Northwest gales to 35 kt. Rain ending during the late
 morning. Waves 4 to 7 ft occasionally to 9 ft building to 6 to 9
 ft occasionally to 12 ft, then subsiding to 4 to 7 ft occasionally
 to 9 ft.

 TONIGHT
 Northwest winds 15 to 25 kt becoming west 10 to 20 kt.
 Clear. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to
 4 ft.

 MONDAY
 Southwest winds 10 to 15 kt becoming south and
 increasing to 30 kt in the afternoon. Sunny. Waves 1 to 2 ft
 building to 4 to 6 ft occasionally to 8 ft.

 MONDAY NIGHT
 South winds to 30 kt becoming west 15 to 25 kt
 overnight. Scattered showers. Waves 4 to 7 ft occasionally to
 9 ft subsiding to 3 to 5 ft.
 
 $$