| NWS Forecast for: Northerly Island to Calumet Harbor IL (LMZ742) Issued by: National Weather Service Chicago, IL Last Update: 242 PM CDT Mon Jul 14 2025 | |
| Tonight: Southeast winds around 10 kt becoming south late. clear. Waves around 1 ft. Tuesday: South winds 5 to 10 kt becoming southeast in the afternoon. Mostly sunny. Waves around 1 ft. Tuesday Night: Southeast winds 5 to 10 kt becoming south overnight. Partly cloudy. Waves around 1 ft. Wednesday: South winds 5 to 10 kt. Chance of showers and thunderstorms, mainly in the afternoon. Waves around 1 ft. | |
| Zone Forecast: Northerly Island to Calumet Harbor IL (LMZ742) | |
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