661
FZUS63 KMKX 070204
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
904 PM CDT Mon Oct 6 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...

Modest northerly winds continue over the southern half of the lake
this evening and overnight behind the cold front, with periods of
showers and weak thunderstorms. Light and variable winds for the
northern half during this period, with periods of light rain.

Showers and storms clear off of the lake in a north to south
manner Tuesday morning, leaving dry weather from mid Tuesday
onwards. High pressure builds to around 30.4 inches into the
Upper Midwest Tuesday and settles over the Great Lakes Region
through midweek. A period of breezy north winds overtakes the
whole lake Tuesday evening and night, subsiding into Wednesday as
high pressure draws closer. Increasing southerly winds return for
the end of the week as the high pressure gradually slides further
east.

LMZ261-362-364-366-563-565-567-868-070930-
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-
904 PM CDT Mon Oct 6 2025

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...North winds 10 to 15 kt becoming northwest.
Chance of showers. Waves 2 to 4 ft.
.TUESDAY...Northwest winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 2 to 4 ft.
.TUESDAY NIGHT...North winds to 30 kt diminishing to 10 to 20 kt.
Waves 4 to 6 ft occasionally to 8 ft.
.WEDNESDAY...North winds 10 to 15 kt. Waves 2 to 4 ft subsiding
to 1 to 3 ft.
.WEDNESDAY NIGHT...East winds 5 to 10 kt becoming southeast.
Waves 1 to 3 ft.
.THURSDAY...South winds 10 to 20 kt. Waves 2 to 4 ft building to
3 to 5 ft.
.THURSDAY NIGHT...South winds 15 to 25 kt becoming southwest.
Waves 3 to 5 ft.
.FRIDAY...Southwest winds 15 to 25 kt diminishing to 10 to 20 kt.
Waves 3 to 5 ft.
.SATURDAY...Southeast winds 10 to 15 kt. Waves 1 to 2 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-070930-
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-
904 PM CDT Mon Oct 6 2025

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...North winds 10 to 20 kt. Chance of showers and
thunderstorms through early evening, then showers likely with
slight chance of thunderstorms overnight. Waves 2 to 4 ft
building to 4 to 6 ft occasionally to 8 ft.
.TUESDAY...North winds 10 to 20 kt. Chance of showers in the
morning. Waves 4 to 7 ft occasionally to 9 ft.
.TUESDAY NIGHT...North winds 10 to 20 kt becoming northeast.
Waves 4 to 6 ft occasionally to 8 ft.
.WEDNESDAY...Northeast winds 10 to 20 kt diminishing to 10 to
15 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 3 to
5 ft.
.WEDNESDAY NIGHT...Northeast winds 10 to 15 kt becoming
southeast. Waves 2 to 4 ft.
.THURSDAY...Southeast winds 10 to 20 kt. Waves 3 to 5 ft.
.THURSDAY NIGHT...Southeast winds 10 to 20 kt becoming south.
Waves 3 to 5 ft.
.FRIDAY...South winds 10 to 20 kt. Waves 3 to 5 ft.
.SATURDAY...East winds 10 to 15 kt. Waves 1 to 3 ft.

$$

LMZ761-070930-
MAFOR 0704/
MICHIGAN NORTH 11820 11810 11710 12720 11730 11740 11840. A
chance of showers overnight. Waves 1 to 3 feet overnight. Waves 1
to 3 feet building to 2 to 4 feet Tuesday. Waves 3 to 5 feet
Tuesday evening.

MICHIGAN SOUTH 12826 13820 11830 12820. A chance of thunderstorms
through this evening, then a chance of showers overnight. Waves 1
to 3 feet building to 3 to 5 feet overnight. Waves 3 to 6 feet
Tuesday and Tuesday evening.

$$


Sheppard

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

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