580
FZUS63 KMKX 311405
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
905 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.
Winds weaken overnight as 29.5 inch low pressure shifts from the
Canadian Prairies into Ontario into Tuesday, reaching the
southern shores of the Hudson Bay by Wednesday. Low pressure will
pull a slow-moving cold front over Lake Michigan in the process,
with north-northeast winds establishing in the wake of the
boundary Wednesday. The front may stall over the lake, but exact
location uncertain. With the front in the vicinity, shower and
storm chances continue tonight through at least midweek. A few
stronger storms with gusty winds and hail are possible. 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.

LMZ261-362-364-366-563-565-567-868-312130-
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-
905 AM CDT Mon Aug 31 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TODAY...South winds 10 to 20 kt increasing to 30 kt.
Chance of showers and slight chance of thunderstorms through mid
morning. Waves 2 to 4 ft building to 4 to 6 ft occasionally to
8 ft.
.TONIGHT...South winds 15 to 25 kt diminishing to 10 to 20 kt
late in the evening, then becoming west 10 to 15 kt after
midnight becoming northwest late. Waves 3 to 5 ft subsiding to
2 to 4 ft.
.TUESDAY...Northeast winds 5 to 10 kt veering to south late in
the morning, then increasing to 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.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-312130-
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-
905 AM CDT Mon Aug 31 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TODAY...South winds 10 to 20 kt increasing to 15 to
25 kt. Slight chance of showers and thunderstorms. Waves 2 to
4 ft building to 4 to 6 ft occasionally to 8 ft.
.TONIGHT...Southwest winds 15 to 25 kt diminishing to 10 to
15 kt. Slight chance of showers in the evening. Waves 3 to 5 ft
subsiding to 2 to 4 ft.
.TUESDAY...Southwest winds 10 to 15 kt. Waves 1 to 2 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.

$$

LMZ761-312130-
MAFOR 3116/
MICHIGAN NORTH 13430 11420 11510 11700 11100 11300. Waves 2 to 4
feet building to 3 to 5 feet this afternoon. Waves 3 to 5 feet
subsiding to 1 to 3 feet tonight. Waves 2 feet or less Tuesday
morning.

MICHIGAN SOUTH 13430 11520 14510. Waves 2 to 4 feet building to 3
to 5 feet this afternoon. Waves 3 to 5 feet subsiding to 1 to 3
feet tonight. Waves 2 feet or less Tuesday morning.

$$


WFO MKX

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

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