National Weather Service Marine Forecast FZUS63 KMKX

FZUS63 KMKX 260144
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
844 PM CDT Fri Sep 25 2026

FOR WATERS BEYOND FIVE NAUTICAL MILES OF SHORE ON Lake Michigan.

Waves are provided as a range of significant wave heights, which is the average of the highest 1/3 of the wave, along with the average height of the highest 10% of the waves which will occasionally be encountered.

SYNOPSIS

High pressure around 30.3 inches will linger over southern Ontario Canada and the Great Lakes through the weekend and into Monday, gradually weakening to 30.1 inches. Quiet weather expected through said period, with light northeast to southeast winds (light and variable at times).

High pressure will progress into the Ohio Valley early Tuesday, allowing winds to turn south and increase as low pressure approaches from the west.

LMZ261-362-364-366-563-565-567-868-260915
Lake Michigan from Seul Choix Point to Rock Island Passage 5 NM offshore to Mid Lake
Lake Michigan South of a line from Seul Choix Point to the Mackinac Bridge and north of a line from Charlevoix MI to South Fox Island 5 NM offshore
Lake Michigan from Charlevoix to Point Betsie MI 5 NM offshore to Mid Lake
Lake Michigan from Point Betsie to Manistee MI 5 NM offshore to Mid Lake
Lake Michigan from Rock Island Passage to Sturgeon Bay WI
Lake Michigan from Sturgeon Bay to Two Rivers WI 5 NM offshore to Mid Lake
Lake Michigan from Two Rivers to Sheboygan WI 5 NM offshore to Mid Lake
Lake Michigan from Pentwater to Manistee MI 5 NM offshore to Mid Lake
844 PM CDT Fri Sep 25 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

REST OF TONIGHT
Northeast winds 5 to 10 kt becoming east. Waves 1 ft or less.

SATURDAY
East winds 5 to 10 kt backing to northeast. Waves 1 to 2 ft.

SATURDAY NIGHT
Northeast winds 10 to 15 kt veering to southeast. Waves 1 ft or less.

SUNDAY
Southeast winds 5 to 10 kt backing to north. Waves 1 ft or less.

SUNDAY NIGHT
North winds 10 to 15 kt diminishing to 5 to 10 kt. Waves 1 ft or less.

MONDAY
Northeast winds 5 to 10 kt becoming north. Waves nearly calm.

MONDAY NIGHT
Northeast winds 5 to 10 kt veering to south. Waves nearly calm.

TUESDAY
South winds 10 to 15 kt increasing to 10 to 20 kt. Waves nearly calm building to 1 to 2 ft.

WEDNESDAY
South winds 15 to 25 kt. Chance of showers. Waves 4 to 7 ft occasionally to 9 ft.

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LMZ080-669-671-673-675-777-779-870-872-874-876-878-260915
Lake Michigan from Michigan City IN to St. Joseph MI 5 NM offshore to Mid Lake
Lake Michigan from Sheboygan to Port Washington WI 5 NM offshore to Mid Lake
Lake Michigan from Port Washington to North Point Light WI 5 NM offshore to Mid Lake
Lake Michigan from North Point Light to Wind Point WI 5 NM offshore to Mid Lake
Lake Michigan from Wind Point WI to Winthrop Harbor IL 5 NM offshore to Mid Lake
Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5 NM offshore to Mid Lake
Lake Michigan from Wilmette Harbor IL to Michigan City IN 5 NM offshore to Mid Lake
Lake Michigan from Whitehall to Pentwater MI 5 NM offshore to Mid Lake
Lake Michigan from Grand Haven to Whitehall MI 5 NM offshore to Mid Lake
Lake Michigan from Holland to Grand Haven MI 5 NM offshore to Mid Lake
Lake Michigan from South Haven to Holland MI 5 NM offshore to Mid Lake
Lake Michigan from St. Joseph to South Haven MI 5 NM offshore to Mid Lake
844 PM CDT Fri Sep 25 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

REST OF TONIGHT
Northeast winds 5 to 10 kt becoming east. Waves 1 to 2 ft.

SATURDAY
East winds 10 to 15 kt becoming northeast. Waves 1 to 2 ft.

SATURDAY NIGHT
Northeast winds 5 to 10 kt becoming east. Waves 1 to 2 ft.

SUNDAY
Northeast winds 5 to 10 kt becoming north 10 to 20 kt in the afternoon. Waves 1 to 2 ft.

SUNDAY NIGHT
North winds 10 to 20 kt becoming northeast 5 to 10 kt overnight. Waves 1 to 2 ft.

MONDAY
Northeast winds 5 to 10 kt becoming north. Waves 1 to 2 ft.

MONDAY NIGHT
Northeast winds 5 to 10 kt veering to southeast. Waves 1 ft or less.

TUESDAY
South winds 10 to 15 kt increasing to 10 to 20 kt. Waves 1 to 2 ft.

WEDNESDAY
South winds 15 to 25 kt. Showers likely. Waves 4 to 7 ft occasionally to 9 ft.

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LMZ761-260915
MAFOR 2604/ MICHIGAN NORTH 13200 12300 11100 12110. Waves 1 foot or less.

MICHIGAN SOUTH 12200 12210 12200 12100. Waves 2 feet or less.

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Sheppard

Experimental modernized open lake forecast is available online at weather.gov/mkx/glftable

Graphical marine forecasts are available online at: weather.gov/greatlakes