| NWS Forecast for: Northerly Island to Calumet Harbor IL (LMZ742) Issued by: National Weather Service Chicago, IL Last Update: 251 PM CDT Sun Aug 2 2026 |  |
Tonight: North winds 20 to 25 kt diminishing to 10 to 15 kt. partly cloudy. Waves 5 to 8 ft occasionally to 10 ft subsiding to 3 to 5 ft by morning. Monday: Northeast winds around 10 kt. Mostly sunny. Waves 3 to 5 ft subsiding to 1 to 2 ft. Monday Night: East winds around 10 kt becoming south overnight. Mostly clear in the evening, then becoming partly cloudy. Waves 1 to 2 ft. Tuesday: South winds around 10 kt. Partly cloudy in the morning, then becoming mostly sunny. Waves 1 to 2 ft. | |
| Zone Forecast: Northerly Island to Calumet Harbor IL (LMZ742) | |
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