030
FZUS63 KMKX 300200
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
900 PM CDT Tue Sep 29 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...

Southerly winds will increase tonight into Wednesday, becoming
southwest Wednesday night into Thursday, as a cold front
approaches from the northern Plains. Wind gusts to 30 knots are
possible Wednesday into Wednesday evening, along with building
waves, particularly across central and northern portions of the
lake.

Expect northwest winds in the wake of the front Thursday
afternoon, with north to northeast winds Thursday night into
Friday. Strong high pressure around 30.4 inches will overspread
the Great Lakes Friday night. A fast-moving low pressure system
around 29.8 inches should move across or north of Lake Superior
Saturday night, with high pressure around 30.4 inches moving
southeast into the region by early next week. Northwest to north
winds should result across Lake Michigan.

LMZ261-362-364-366-563-565-567-868-300900-
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-
900 PM CDT Tue Sep 29 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.REST OF TONIGHT...South winds 10 to 20 kt increasing to 30 kt.
Slight chance of showers late this evening, then showers and
slight chance of thunderstorms overnight. Waves 3 to 5 ft
building to 4 to 7 ft occasionally to 9 ft.
.WEDNESDAY...South winds to 30 kt becoming southwest. Chance of
showers in the morning, then slight chance of showers in the
afternoon. Waves 6 to 9 ft occasionally to 12 ft.
.WEDNESDAY NIGHT...Southwest winds 15 to 25 kt diminishing to
10 to 20 kt. Chance of showers overnight. Waves 6 to 9 ft
occasionally to 12 ft subsiding to 3 to 5 ft.
.THURSDAY...West winds 10 to 20 kt becoming northwest. Chance of
showers. Waves 2 to 4 ft subsiding to 1 to 3 ft.
.THURSDAY NIGHT...North winds 10 to 20 kt. Chance of showers in
the evening. Waves 1 to 2 ft building to 2 to 4 ft.
.FRIDAY...North winds 10 to 20 kt. Waves 3 to 5 ft.
.FRIDAY NIGHT...North winds 10 to 20 kt becoming northeast 5 to
10 kt. Waves 2 to 4 ft subsiding to 1 to 2 ft.
.SATURDAY...Southeast winds 5 to 10 kt becoming south. Waves 1 to
2 ft.
.SUNDAY...West winds 15 to 25 kt becoming northwest to 30 kt.
Waves 2 to 4 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-300900-
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-
900 PM CDT Tue Sep 29 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

.REST OF TONIGHT...South winds 10 to 20 kt. Chance of showers
overnight. Waves 3 to 5 ft.
.WEDNESDAY...South winds 15 to 25 kt increasing to 30 kt. Showers
in the morning, then showers likely in the afternoon. Waves 4 to
6 ft occasionally to 8 ft building to 6 to 9 ft occasionally to
12 ft.
.WEDNESDAY NIGHT...South winds 15 to 25 kt becoming southwest
10 to 15 kt. Chance of showers in the evening, then showers
overnight. Waves 6 to 9 ft occasionally to 12 ft subsiding to
2 to 4 ft.
.THURSDAY...Southwest winds 10 to 15 kt becoming west. Showers.
Waves 2 to 4 ft subsiding to 1 to 2 ft.
.THURSDAY NIGHT...North winds 10 to 20 kt. Showers in the
evening, then chance of showers overnight. Waves 1 to 3 ft
building to 4 to 6 ft occasionally to 8 ft.
.FRIDAY...Northeast winds 10 to 20 kt becoming north 15 to 25 kt.
Waves 4 to 7 ft occasionally to 9 ft.
.FRIDAY NIGHT...Northeast winds 10 to 20 kt diminishing to 10 to
15 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to
5 ft.
.SATURDAY...East winds 10 to 15 kt diminishing to 5 to 10 kt.
Waves 2 to 4 ft subsiding to 1 to 3 ft.
.SUNDAY...West winds 10 to 20 kt becoming northwest. Waves 2 to
4 ft.

$$

LMZ761-300900-
MAFOR 3004/
MICHIGAN NORTH 11420 11436 11446 13540 11530 11520. Waves 2 to 4
feet building to 3 to 6 feet overnight. Waves 5 to 8 feet
building to 6 to 9 feet Wednesday. Waves 5 to 8 feet Wednesday
evening.

MICHIGAN SOUTH 11420 11426 12436 12446 11440 11520. Waves 2 to 4
feet overnight. Waves 3 to 6 feet building to 6 to 9 feet
Wednesday. Waves 5 to 8 feet Wednesday evening.

$$


Patterson

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

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