271
FZUS63 KMKX 080802
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
302 AM CDT Tue Sep 8 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 30.2 inches will remain over the lower Great
Lakes today. Meanwhile, low pressure around 29.6 inches over the
northern High Plains will lift northward through the Canadian
Prairies. This will allow for gradually increasing southerly
winds today through tonight, especially over the north half of
the lake.

As low pressure enters Hudson Bay late tonight, winds shift
southwesterly, then westerly on Wednesday as a cold front pushes
southeastward through the lake. Winds become northwesterly behind
the front, gradually weakening through Thursday and Thursday
night. Winds shift to southerly again and increase into Friday, as
low pressure develops in the northern Plains.

LMZ261-362-364-366-563-565-567-868-081530-
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-
302 AM CDT Tue Sep 8 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...South winds 10 to 20 kt increasing to 30 kt. Slight
chance of showers and thunderstorms this afternoon. Waves 4 to
6 ft occasionally to 8 ft.
.TONIGHT...South winds to 30 kt becoming southwest. Chance of
showers and slight chance of thunderstorms in the evening, then
chance of showers and thunderstorms overnight. Waves 4 to 6 ft
occasionally to 8 ft.
.WEDNESDAY...Southwest winds to 30 kt. Chance of showers in the
morning. Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to
5 ft.
.WEDNESDAY NIGHT...West winds to 30 kt becoming northwest 15 to
25 kt. Waves 3 to 5 ft.
.THURSDAY...Northwest winds 10 to 20 kt. Waves 2 to 4 ft.
.THURSDAY NIGHT...Southwest winds 10 to 15 kt becoming south.
Waves 1 to 2 ft.
.FRIDAY...South winds 15 to 25 kt increasing to 30 kt. Waves 2 to
4 ft building to 4 to 6 ft occasionally to 8 ft.
.SATURDAY...Southwest gales to 35 kt diminishing to 30 kt. Chance
of showers. Waves 5 to 8 ft occasionally to 10 ft subsiding to
4 to 7 ft occasionally to 9 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-081530-
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-
302 AM CDT Tue Sep 8 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...South winds 10 to 20 kt increasing to 15 to 25 kt. Waves
3 to 5 ft.
.TONIGHT...South winds 10 to 20 kt becoming southwest 15 to
25 kt. Slight chance of showers and thunderstorms in the evening,
then chance of showers and slight chance of thunderstorms
overnight. Waves 4 to 6 ft occasionally to 8 ft.
.WEDNESDAY...Southwest winds 15 to 25 kt becoming west 10 to
20 kt. Showers likely in the morning. Waves 4 to 6 ft
occasionally to 8 ft subsiding to 3 to 5 ft.
.WEDNESDAY NIGHT...West winds 10 to 20 kt becoming northwest.
Waves 2 to 4 ft.
.THURSDAY...Northwest winds 10 to 20 kt becoming north. Waves
2 to 4 ft.
.THURSDAY NIGHT...North winds 5 to 10 kt veering to southeast
10 to 15 kt. Waves 1 to 3 ft subsiding to 1 to 2 ft.
.FRIDAY...South winds 10 to 20 kt increasing to 30 kt. Waves 2 to
4 ft building to 4 to 6 ft occasionally to 8 ft.
.SATURDAY...Southwest winds to 30 kt becoming west. Waves 5 to
8 ft occasionally to 10 ft subsiding to 4 to 7 ft occasionally to
9 ft.

$$

LMZ761-081530-
MAFOR 0810/
MICHIGAN NORTH 12420 14430 11540 11546. A chance of thunderstorms
overnight. Waves 1 to 3 feet building to 3 to 5 feet today. Waves
3 to 5 feet tonight.

MICHIGAN SOUTH 13420 12430 12420 11530. A chance of showers and
thunderstorms overnight. Waves 1 to 3 feet building to 3 to 5
feet today. Waves 3 to 5 feet subsiding to 2 to 4 feet tonight.

$$


Sheppard

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

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