| NWS Forecast for: Northerly Island to Calumet Harbor IL (LMZ742) Issued by: National Weather Service Chicago, IL Last Update: 242 PM CDT Wed Apr 29 2026 |  |
| Tonight: North winds 15 to 25 kt becoming northwest 10 to 15 kt after midnight. Partly cloudy in the evening then clearing. Waves 2 to 4 ft subsiding to 1 to 3 ft. Thursday: Northwest winds 10 to 15 kt becoming east in the afternoon. Partly cloudy in the morning, then becoming mostly cloudy. Waves 1 to 2 ft. Thursday Night: East winds around 10 kt becoming north overnight. Slight chance of showers in the evening. Waves 1 to 2 ft. Friday: North winds 10 to 15 kt becoming northeast in the afternoon. Slight chance of showers in the afternoon. Waves 1 to 2 ft. | |
| Zone Forecast: Northerly Island to Calumet Harbor IL (LMZ742) | |
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