| NWS Forecast for: Northerly Island to Calumet Harbor IL (LMZ742) Issued by: National Weather Service Chicago, IL Last Update: 938 PM CDT Sat Oct 31 2026 | |
| Rest Of Tonight: Southeast winds 10 to 15 kt becoming south. Chance of showers after midnight. Waves 1 to 3 ft. Sunday: Southeast winds around 10 kt. Chance of sprinkles. waves 1 to 2 ft. Sunday Night: Southeast winds 10 to 15 kt becoming south. Mostly cloudy. Waves 1 to 3 ft. Monday: South winds 10 to 20 kt. Slight chance of showers in the afternoon. Waves 1 to 3 ft building to 2 to 4 ft. | |
| Zone Forecast: Northerly Island to Calumet Harbor IL (LMZ742) | |
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