| NWS Forecast for: Northerly Island to Calumet Harbor IL (LMZ742) Issued by: National Weather Service Chicago, IL Last Update: 317 AM CST Fri Nov 14 2025 |  |
| Early This Morning: South winds around 15 kt. Mostly clear. waves 1 to 2 ft. Today: Southwest winds 10 to 15 kt becoming south. Sunny. Waves 1 to 2 ft. Tonight: South winds 15 to 25 kt becoming southwest. 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 25 kt becoming west in the afternoon. Mostly cloudy. Waves 2 to 4 ft subsiding to 1 to 3 ft. Saturday Night: Northwest winds to 30 kt. Partly cloudy in the evening then clearing. Waves 3 to 5 ft building to 4 to 6 ft occasionally to 8 ft. A small craft advisory will be needed. | |
| Zone Forecast: Northerly Island to Calumet Harbor IL (LMZ742) | |
Visit your local NWS office at: https://www.weather.gov/lot |