287
FZUS63 KMKX 200813
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
313 AM CDT Sun Sep 20 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...

Low pressure around 29.8 inches will move from southeast Iowa
into the Ohio Valley today into Monday. Meanwhile, high pressure
around 30.4 inches will strengthen and move east into Ontario
today into Monday, then into Quebec for Monday night into
Wednesday. Gusty northeast winds are expected today into tonight,
becoming east and remaining gusty Monday into Wednesday. A few
gale force gusts may occur today into Monday, mainly over southern
portions of the lake. Building waves are expected over western
portions of the lake today into the middle of the week. Lighter
easterly winds should then linger for Thursday into Friday, as the
high pressure system slowly moves further east.

LMZ261-362-364-366-563-565-567-868-201530-
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-
313 AM CDT Sun Sep 20 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...Northeast winds 15 to 25 kt increasing to 30 kt. Waves
4 to 7 ft occasionally to 9 ft building to 7 to 10 ft
occasionally to 13 ft.
.TONIGHT...Northeast winds to 30 kt becoming east 15 to 25 kt.
Waves 8 to 11 ft occasionally to 14 ft subsiding to 6 to 9 ft
occasionally to 12 ft.
.MONDAY...East winds 15 to 25 kt becoming northeast to 30 kt.
Waves 4 to 7 ft occasionally to 9 ft.
.MONDAY NIGHT...Northeast winds to 30 kt becoming east 15 to
25 kt. Waves 4 to 7 ft occasionally to 9 ft.
.TUESDAY...Northeast winds 15 to 25 kt increasing to 30 kt. Waves
4 to 6 ft occasionally to 8 ft.
.TUESDAY NIGHT...East winds to 30 kt diminishing to 10 to 20 kt.
Waves 4 to 7 ft occasionally to 9 ft subsiding to 4 to 6 ft
occasionally to 8 ft.
.WEDNESDAY...East winds 15 to 25 kt becoming northeast. Waves
3 to 5 ft.
.THURSDAY...East winds 10 to 15 kt becoming northeast 10 to
20 kt. Waves 1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-201530-
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-
313 AM CDT Sun Sep 20 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...Northeast winds 15 to 25 kt increasing to 30 kt. Patchy
fog. Scattered showers and slight chance of thunderstorms this
morning, then scattered showers this afternoon. Waves 4 to 7 ft
occasionally to 9 ft building to 10 to 14 ft occasionally to
18 ft.
.TONIGHT...Northeast winds to 30 kt becoming east. Waves 10 to
14 ft occasionally to 18 ft subsiding to 7 to 10 ft occasionally
to 13 ft.
.MONDAY...East winds to 30 kt becoming northeast. Waves 8 to
11 ft occasionally to 14 ft subsiding to 7 to 10 ft occasionally
to 13 ft.
.MONDAY NIGHT...Northeast winds to 30 kt. Waves 6 to 9 ft
occasionally to 12 ft.
.TUESDAY...Northeast winds to 30 kt. Waves 6 to 9 ft occasionally
to 12 ft.
.TUESDAY NIGHT...Northeast winds to 30 kt diminishing to 15 to
25 kt. Waves 5 to 8 ft occasionally to 10 ft.
.WEDNESDAY...Northeast winds 15 to 25 kt. Waves 5 to 8 ft
occasionally to 10 ft.
.THURSDAY...East winds 10 to 20 kt becoming northeast 10 to
15 kt. Waves 3 to 5 ft.

$$

LMZ761-201530-
MAFOR 2010/
MICHIGAN NORTH 11130 15140 11230. Waves 1 to 3 feet building to 7
to 10 feet today. Waves 7 to 10 feet subsiding to 5 to 8 feet
tonight.

MICHIGAN SOUTH 11136 13140 19146 12140 12240. Waves 2 to 4 feet
building to 9 to 12 feet today. Waves 10 to 13 feet subsiding to
6 to 10 feet tonight.

$$
Wood

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

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