Chart / Forecasts

Lake Michigan from Wind Point WI to Winthrop Harbor IL 5 NM offshore to Mid Lake

LMZ675 · Open Lake Forecast · National Weather Service Milwaukee/Sullivan WI · Issued 902 PM CDT Sun Oct 4 2026
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Forecast
Rest Of Tonight
Northwest winds 10 to 20 kt becoming north. Waves 4 to 6 ft occasionally to 8 ft.
Monday
North winds 10 to 20 kt diminishing to 10 to 15 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to 5 ft.
Monday Night
North winds 5 to 10 kt veering to southeast late in the evening, then becoming south 10 to 15 kt after midnight increasing to 10 to 20 kt late. Waves 1 to 3 ft building to 2 to 4 ft.
Tuesday
South winds to 30 kt increasing to gales to 35 kt. Waves 6 to 9 ft occasionally to 12 ft building to 8 to 12 ft occasionally to 16 ft.
Tuesday Night
Southwest gales to 35 kt becoming west 15 to 25 kt overnight. Waves 8 to 12 ft occasionally to 16 ft subsiding to 5 to 8 ft occasionally to 10 ft.
Wednesday
West winds 10 to 20 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to 4 ft.
Wednesday Night
West winds 10 to 20 kt becoming northwest. Waves 2 to 4 ft building to 3 to 5 ft.
Thursday
Northwest winds 10 to 20 kt becoming west. Waves 3 to 5 ft.
Friday
Southwest winds 10 to 20 kt. Waves 2 to 4 ft.
Synopsis
Northwest winds will gradually decrease tonight into Monday as high pressure of 30.2 inches enters from the west. A few waterspouts remain possible across the far northern edge of the lake into tonight. Low pressure of 29.4 inches will build toward the Hudson Bay Tuesday through Thursday. Ahead of this low, south southwest winds will increase Tuesday afternoon through Wednesday and become gusty. There remains a risk for gusts to approach gales, particularly over the northern half of the open waters, and will continue to be monitored for possible headlines. The low will pull a cold front across the waters Wednesday night into Thursday, delivering scattered showers and shifting winds to the west northwest.
Source: National Weather Service Open Lake Forecast (GLF), issued 902 PM CDT Sun Oct 4 2026, valid until Mon, 05 Oct 2026 09:30 UTC. Original text · All zones