970
FZUS63 KMKX 090150
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
850 PM CDT Mon Sep 8 2025

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 continue to move east across
the Eastern Great Lakes and New England tonight into Tuesday.
Meanwhile a wave of low pressure will move across Lake Superior
later Tuesday with breezy south winds ahead of the wave,
especially across the north half of the lake. The breezy south
winds will become much lighter Tuesday night and Wednesday. Light
northeast winds will prevail on Thursday after a weak frontal
passage, becoming south to southeast for Friday.

LMZ261-362-364-366-563-565-567-868-090915-
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-
850 PM CDT Mon Sep 8 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...South winds to 30 kt. Waves 4 to 7 ft
occasionally to 9 ft.
.TUESDAY...Southwest winds to 30 kt becoming south 15 to 25 kt.
Slight chance of showers in the afternoon. Waves 4 to 7 ft
occasionally to 9 ft.
.TUESDAY NIGHT...South winds 15 to 25 kt becoming southwest 10 to
15 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to
4 ft.
.WEDNESDAY...Southwest winds 5 to 10 kt. Waves 1 to 3 ft.
.WEDNESDAY NIGHT...Northeast winds 5 to 10 kt. Waves 1 ft or
less.
.THURSDAY...Northeast winds 5 to 10 kt increasing to 10 to 15 kt.
Waves 1 ft or less.
.THURSDAY NIGHT...Northeast winds 10 to 15 kt becoming southeast
5 to 10 kt. Waves 1 to 2 ft.
.FRIDAY...South winds 10 to 15 kt. Waves 1 to 2 ft.
.SATURDAY...Southwest winds 10 to 15 kt increasing to 10 to
20 kt. Chance of showers. Waves 1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-090915-
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-
850 PM CDT Mon Sep 8 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...South winds 10 to 20 kt increasing to 15 to
25 kt. Waves 4 to 6 ft occasionally to 8 ft.
.TUESDAY...South winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 4 to 6 ft occasionally to 8 ft.
.TUESDAY NIGHT...Southeast winds 10 to 20 kt becoming south 5 to
10 kt. Waves 3 to 5 ft subsiding to 1 to 3 ft.
.WEDNESDAY...South winds 5 to 10 kt. Waves 1 to 2 ft.
.WEDNESDAY NIGHT...East winds 5 to 10 kt. Waves 1 to 2 ft.
.THURSDAY...East winds 5 to 10 kt becoming northeast. Waves 1 to
2 ft.
.THURSDAY NIGHT...Northeast winds 5 to 10 kt becoming east 10 to
15 kt. Waves 1 to 2 ft.
.FRIDAY...Southeast winds 10 to 15 kt becoming south. Waves 1 to
2 ft.
.SATURDAY...South winds 10 to 15 kt. Waves 2 to 4 ft.

$$

LMZ761-090915-
MAFOR 0904/
MICHIGAN NORTH 13440 12540 12430 11420. Waves 3 to 6 feet.

MICHIGAN SOUTH 13430 13420 11320 11310. Waves 3 to 5 feet
overnight and Tuesday. Waves 2 to 4 feet Tuesday evening.

$$


DDV

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

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