392
FZUS63 KMKX 310801
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
301 AM CDT Mon Aug 31 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...

South-southwest winds will become breezy once again this
afternoon, when 25-30 knot gusts are anticipated over at least the
southern two-thirds of the waters. Gales are not anticipated.
Periods of showers and storms continue through the overnight hours
tonight.

29.5 inch low pressure will shift from the Canadian Great Plains
into Ontario tonight through Tuesday, ultimately reaching the
southern shores of the Hudson Bay by daybreak Wednesday. The
advancing low will pull a slow-moving cold front over Lake
Michigan in the process, with north-northeast winds establishing
in the wake of the boundary. Whether the front clears entirely
south of the waters or stalls out somewhere over the lake remains
uncertain. With the front in the vicinity, shower and storm
chances thus continue tonight through at least mid-week. A few
stronger storms with gusty winds and hail are possible during this
time frame. If the front remains close to stationary through the
first half of the week, it will ultimately clear south of Lake
Michigan by Thursday, bringing northeast winds for the end of the
week.

LMZ261-362-364-366-563-565-567-868-311545-
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-
301 AM CDT Mon Aug 31 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TODAY...South winds 15 to 25 kt increasing to 30 kt. Chance of
showers and thunderstorms this morning. Waves 3 to 5 ft building
to 4 to 6 ft occasionally to 8 ft.
.TONIGHT...South winds 15 to 25 kt becoming southwest 10 to 20 kt
late in the evening, then becoming west 10 to 15 kt after
midnight becoming northwest 5 to 10 kt late. Slight chance of
showers in the evening. Waves 4 to 6 ft occasionally to 8 ft
subsiding to 2 to 4 ft.
.TUESDAY...West winds 5 to 10 kt backing to south late in the
morning, then becoming south 10 to 15 kt early in the afternoon
increasing to 10 to 20 kt late. Waves 1 to 3 ft.
.TUESDAY NIGHT...Southwest winds 10 to 15 kt becoming west 5 to
10 kt. Chance of showers overnight. Waves 1 to 2 ft.
.WEDNESDAY...Northwest winds 10 to 15 kt becoming north. Chance
of showers in the morning. Waves 1 to 2 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.
.FRIDAY...East winds 5 to 10 kt becoming northeast 10 to 15 kt.
Waves 1 ft or less.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-311545-
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-
301 AM CDT Mon Aug 31 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.TODAY...South winds 15 to 25 kt becoming southwest. Chance of
showers and slight chance of thunderstorms this morning, then
slight chance of showers and thunderstorms this afternoon. Waves
3 to 5 ft building to 4 to 6 ft occasionally to 8 ft.
.TONIGHT...Southwest winds 15 to 25 kt diminishing to 10 to
15 kt. Waves 4 to 6 ft occasionally to 8 ft subsiding to 2 to
4 ft.
.TUESDAY...Southwest winds 10 to 15 kt. Waves 1 to 3 ft.
.TUESDAY NIGHT...Southwest winds 10 to 15 kt. Waves 1 to 2 ft.
.WEDNESDAY...South winds 10 to 15 kt. Waves 1 to 2 ft.
.WEDNESDAY NIGHT...Northwest winds 10 to 15 kt becoming north.
Chance of showers and thunderstorms. Waves 1 to 2 ft.
.THURSDAY...Northeast winds 5 to 10 kt becoming north 10 to
15 kt. Chance of showers. Waves 1 to 2 ft.
.FRIDAY...East winds 10 to 15 kt becoming northeast. Waves 1 to
2 ft.

$$

LMZ761-311545-
MAFOR 3110/
MICHIGAN NORTH 11420 14430 11520 12610. A chance of showers and
thunderstorms this morning. Waves 1 to 3 feet building to 3 to 6
feet today. Waves 3 to 5 feet subsiding to 1 to 3 feet tonight.

MICHIGAN SOUTH 14430 11530 11520 12510. A chance of showers and
thunderstorms early, then a chance of showers this morning. Waves
1 to 3 feet building to 3 to 6 feet today. Waves 3 to 5 feet
subsiding to 1 to 3 feet tonight.

$$


DDV

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

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