Chicago Nearshore Marine Forecasts by Zone

 
 

 
 
 
 
 
FORECAST For Wilmette Harbor to Northerly Island (LMZ741)
 
 
 
 
 LMZ740>742-070415-
 Winthrop Harbor to Wilmette Harbor IL-
 Wilmette Harbor to Northerly Island IL-
 Northerly Island to Calumet Harbor IL-
 511 PM CST Fri Mar 6 2026
 
 DENSE FOG ADVISORY IN EFFECT UNTIL 9 PM CST THIS EVENING
 SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY MORNING
 

 TONIGHT
 South winds 20 to 25 kt becoming southwest. Areas of
 dense fog early in the evening. Chance of showers and
 thunderstorms in the evening, then showers and a chance of
 thunderstorms after midnight. Waves 2 to 4 ft.

 SATURDAY
 Southwest winds 20 to 25 kt becoming west 15 to 25 kt
 in the afternoon. Showers and a chance of thunderstorms in the
 morning. Waves 2 to 4 ft subsiding to 1 to 3 ft.

 SATURDAY NIGHT
 West winds 10 to 20 kt becoming southwest
 overnight. Mostly cloudy in the evening then clearing. Waves 1 to
 2 ft.

 SUNDAY
 Southwest winds 15 to 25 kt. Mostly sunny. Waves 1 to
 3 ft.
 
 $$