Chicago Nearshore Marine Forecasts by Zone

 
 

 
 
 
 
 
FORECAST For Wilmette Harbor to Northerly Island (LMZ741)
 
 
 
 
 LMZ740>742-210315-
 Winthrop Harbor to Wilmette Harbor IL-
 Wilmette Harbor to Northerly Island IL-
 Northerly Island to Calumet Harbor IL-
 244 PM CDT Sat Sep 20 2025
 

 TONIGHT
 Southeast winds around 10 kt becoming south 10 to 15
 kt late. Scattered showers and thunderstorms. Waves 1 to 3 ft.

 SUNDAY
 South winds around 10 kt. Chance of showers and slight
 chance of thunderstorms in the morning, then chance of showers and
 thunderstorms in the afternoon. Waves 1 to 2 ft.

 SUNDAY NIGHT
 Southwest winds 5 to 10 kt. Chance of showers and
 thunderstorms in the evening, then chance of showers overnight.
 Waves around 1 ft.

 MONDAY
 Southwest winds 5 to 10 kt becoming south in the
 afternoon. Chance of showers in the morning, then showers likely
 and slight chance of thunderstorms in the afternoon. Waves around
 1 ft.
 
 $$