| NWS Forecast for: Northerly Island to Calumet Harbor IL (LMZ742) Issued by: National Weather Service Chicago, IL Last Update: 301 PM CST Thu Nov 13 2025 | |
| Tonight: Southwest winds 10 to 15 kt becoming south this evening. Partly cloudy in the evening then clearing. Waves 1 to 2 ft. Friday: Southwest winds 10 to 15 kt becoming south. Sunny. Waves 1 to 2 ft. Friday Night: South winds 10 to 15 kt increasing to 15 to 20 kt. Partly cloudy in the evening, then becoming mostly cloudy. Waves 1 to 2 ft building to 2 to 4 ft. Saturday: Southwest winds 15 to 20 kt becoming west in the afternoon. Mostly cloudy in the morning, then becoming partly cloudy. Waves 2 to 4 ft. | |
| Zone Forecast: Northerly Island to Calumet Harbor IL (LMZ742) | |
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