261
FZUS63 KMKX 210155
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
855 PM 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...

High pressure around 30.4 inches will build eastward through
Monday, reaching Quebec by Monday night. The high pressure will
then largely remain in place through midweek, while strengthening
to around 30.7 inches. Gusty northeast winds are expected tonight,
becoming more easterly and remaining gusty Monday into Wednesday.
A few brief gale force gusts may occur at time into Monday,
mainly over southern portions of the lake, but coverage remains
sporadic. Due to prevailing easterly flow, waves continue to build
and impact western portions of the lake through midweek. Winds
then look to diminish toward the end of the week as the high
pressure system slowly weakens and moves farther east.

LMZ261-362-364-366-563-565-567-868-210915-
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-
855 PM CDT Sun Sep 20 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...Northeast winds to 30 kt diminishing to 15 to
25 kt after midnight, then becoming east 10 to 20 kt late. Waves
7 to 10 ft occasionally to 13 ft subsiding to 6 to 9 ft
occasionally to 12 ft.
.MONDAY...East winds 10 to 20 kt becoming northeast 15 to 25 kt.
Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 5 ft.
.MONDAY NIGHT...Northeast winds 15 to 25 kt becoming east 10 to
20 kt. Waves 4 to 6 ft occasionally to 8 ft.
.TUESDAY...East winds 15 to 25 kt becoming northeast. Waves 4 to
6 ft occasionally to 8 ft.
.TUESDAY NIGHT...East winds 15 to 25 kt diminishing to 10 to
20 kt. Waves 4 to 6 ft occasionally to 8 ft.
.WEDNESDAY...East winds 15 to 25 kt becoming northeast. Waves
2 to 4 ft.
.WEDNESDAY NIGHT...East winds 15 to 25 kt becoming southeast
10 to 20 kt. Waves 2 to 4 ft.
.THURSDAY...East winds 10 to 15 kt increasing to 10 to 20 kt.
Waves 2 to 4 ft subsiding to 1 to 2 ft.
.FRIDAY...Southeast winds 5 to 10 kt becoming east. Waves 1 to
2 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-210915-
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-
855 PM CDT Sun Sep 20 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...Northeast winds to 30 kt becoming east. Waves
8 to 12 ft occasionally to 16 ft subsiding to 7 to 10 ft
occasionally to 13 ft.
.MONDAY...East winds to 30 kt becoming northeast 15 to 25 kt.
Waves 6 to 9 ft occasionally to 12 ft.
.MONDAY NIGHT...Northeast winds 15 to 25 kt. Waves 5 to 8 ft
occasionally to 10 ft.
.TUESDAY...Northeast winds 15 to 25 kt increasing to 30 kt. Waves
5 to 8 ft occasionally to 10 ft.
.TUESDAY NIGHT...Northeast winds to 30 kt diminishing to 15 to
25 kt. Waves 4 to 7 ft occasionally to 9 ft.
.WEDNESDAY...Northeast winds 15 to 25 kt. Waves 4 to 7 ft
occasionally to 9 ft.
.WEDNESDAY NIGHT...East winds 10 to 20 kt. Waves 4 to 6 ft
occasionally to 8 ft.
.THURSDAY...East winds 10 to 20 kt becoming northeast 10 to
15 kt. Waves 3 to 5 ft.
.FRIDAY...East winds 10 to 15 kt becoming northeast. Waves 1 to
3 ft.

$$

LMZ761-210915-
MAFOR 2104/
MICHIGAN NORTH 11130 13220 13130 11230. Waves 5 to 9 feet
subsiding to 4 to 7 feet overnight. Waves 3 to 6 feet Monday and
Monday evening.

MICHIGAN SOUTH 11140 11230 12240 11140 12130 11230. Waves 6 to 10
feet overnight. Waves 5 to 9 feet subsiding to 4 to 7 feet
Monday. Waves 3 to 6 feet building to 4 to 7 feet Monday evening.

$$


Wagner

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

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