377
FZUS63 KMKX 251939
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
239 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 into the weekend, gradually
weakening to 30.1 inches. Northeast winds this evening will
become east to southeast again by Saturday morning. Predominantly
dry and quiet weather is expected through the weekend.

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

LMZ261-362-364-366-563-565-567-868-260315-
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-
239 PM CDT Fri Sep 25 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.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 1 to 2 ft.
.WEDNESDAY...South winds 15 to 25 kt. Chance of showers. Waves
4 to 7 ft occasionally to 9 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-260315-
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-
239 PM CDT Fri Sep 25 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.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.

$$

LMZ761-260315-
MAFOR 2522/
MICHIGAN NORTH 12100 13200 12300 11100. Waves 1 foot or less.

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

$$


DDV

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

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