| NWS Forecast for: Northerly Island to Calumet Harbor IL (LMZ742) Issued by: National Weather Service Chicago, IL Last Update: 940 PM CDT Sat Apr 18 2026 |  |
Rest Of Tonight: West winds 15 to 25 kt becoming southwest 10 to 20 kt. Clear. Waves 2 to 4 ft subsiding to 1 to 3 ft. Sunday: Southwest winds 10 to 15 kt becoming northwest 15 to 25 kt. Slight chance of showers in the morning, then chance of showers in the afternoon. Waves 1 to 3 ft. Sunday Night: North winds 10 to 15 kt becoming northeast overnight. Partly cloudy in the evening then clearing. Waves 1 to 3 ft. Monday: East winds 10 to 15 kt becoming southeast. Mostly sunny. Waves 1 to 3 ft. | |
| Zone Forecast: Northerly Island to Calumet Harbor IL (LMZ742) | |
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