Coastal Waters Forecast for Northerly Island to Calumet Harbor IL (LMZ742) (Text-Only)
NWS Forecast for: Northerly Island to Calumet Harbor IL (LMZ742)
Issued by: National Weather Service Chicago, IL
Last Update: 912 AM CDT Tue Jul 15 2025
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Rest Of Today: Southeast winds 5 to 10 kt becoming east around 10 kt in the afternoon. Mostly sunny. Waves around 1 ft.

Tonight: Southeast winds 5 to 10 kt becoming south overnight. Partly cloudy. Waves around 1 ft.

Wednesday: South winds 5 to 10 kt becoming southeast in the afternoon. Slight chance of showers and thunderstorms in the afternoon. Waves around 1 ft.

Wednesday Night: South winds around 10 kt becoming west overnight. Showers and thunderstorms likely in the evening, then chance of showers and thunderstorms overnight. Waves 1 to 2 ft.







Zone Forecast: Northerly Island to Calumet Harbor IL (LMZ742)

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