433
FZUS63 KMKX 081902
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
202 PM 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...

Southerly winds will increase into tonight as 29.4 inch low
pressure shifts northeast toward the Hudson Bay. A cold front will
move across Lake Michigan on Wednesday, bringing a generally
westerly wind shift across the lake. Periods of showers and
occasional thunderstorms will accompany the approaching/passing
surface front this afternoon through Wednesday morning. Severe
weather isn`t expected.

A new area of 30.1 inch high pressure will move from the northern
Great Plains across Lake Michigan Wednesday night through Thursday
night, bringing a period of light and variable winds to the
waters. The next area of 29.3 inch low pressure will shift from
the Canadian Great Plains across the Hudson Bay Friday afternoon
through Saturday night, bringing increasing southwest winds. A few
gale force gusts are possible during this time frame, particularly
over the northern third of Lake Michigan. Will be monitoring
trends through late week for possible headlines. A cold front will
move over Lake Michigan Sunday morning, bringing a northwest wind
shift to the waters.

LMZ261-362-364-366-563-565-567-868-090315-
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-
202 PM CDT Tue Sep 8 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

.TONIGHT...South winds to 30 kt becoming southwest. Chance of
showers and thunderstorms this evening, then chance of showers
and slight chance of thunderstorms overnight. Waves 4 to 6 ft
occasionally to 8 ft.
.WEDNESDAY...Southwest winds to 30 kt. Chance of showers and
slight chance of thunderstorms in the morning. Waves 4 to 6 ft
occasionally to 8 ft.
.WEDNESDAY NIGHT...West winds to 30 kt becoming northwest 15 to
25 kt, then diminishing to 10 to 20 kt late. Waves 3 to 5 ft.
.THURSDAY...Northwest winds 10 to 20 kt. Waves 2 to 4 ft.
.THURSDAY NIGHT...East winds 10 to 15 kt veering to 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.
.FRIDAY NIGHT...South winds to 30 kt. A few southerly gales to 35
kt are possible. Waves 5 to 8 ft occasionally to 10 ft.
.SATURDAY...Southwest winds to 30 kt. A few southwest gales to 35
kt are possible. Chance of showers. Waves 5 to 8 ft occasionally
to 10 ft subsiding to 4 to 7 ft occasionally to 9 ft.
.SUNDAY...Northwest winds 10 to 20 kt increasing to 15 to 25 kt.
Waves 1 to 3 ft.

$$

LMZ080-669-671-673-675-777-779-870-872-874-876-878-090315-
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-
202 PM CDT Tue Sep 8 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

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

$$

LMZ761-090315-
MAFOR 0822/
MICHIGAN NORTH 12430 13540 11530 11640 11540. A chance of showers
early this evening, then a chance of showers and thunderstorms
this evening. A chance of showers overnight. A chance of showers
Wednesday morning. Waves 3 to 5 feet tonight. Waves 3 to 5 feet
subsiding to 2 to 4 feet Wednesday.

MICHIGAN SOUTH 11430 12420 14530 11630. A chance of showers early
this evening. A chance of showers overnight. A chance of showers
Wednesday morning. Waves 2 to 4 feet building to 3 to 5 feet
tonight. Waves 3 to 5 feet subsiding to 2 to 4 feet Wednesday.

$$


Quigley

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

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