National Weather Service Marine Forecast FZUS63 KMKX

FZUS63 KMKX 260853
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
353 AM CDT Sun Jul 26 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

Low pressure around 29.8 inches will remain over Wisconsin and Lake Michigan through most of Monday which will result in increasing thunderstorm chances with severe storms possible. Very warm, moist and unstable air flowing over the relatively cool waters may cause patchy dense fog over the lake through Monday as well.

Northerly winds will develop Monday night through Wednesday as high pressure around 29.9 inches builds over the Upper Great Lakes and the front pushes southward. A few gale force gusts are possible Tuesday afternoon. Look for southerly winds and more unsettled weather to resume Thursday into next weekend.

LMZ261-362-364-366-563-565-567-868-261515
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
353 AM CDT Sun Jul 26 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

TODAY
West winds 5 to 10 kt becoming southwest late this morning, then increasing to 10 to 15 kt early this afternoon becoming south 10 to 20 kt late. Patchy fog this morning. Waves 1 to 3 ft.

TONIGHT
South winds 10 to 20 kt becoming southwest 10 to 15 kt. Chance of showers and thunderstorms in the evening, then chance of showers and slight chance of thunderstorms overnight. Waves 1 to 3 ft.

MONDAY
Southwest winds 10 to 15 kt backing to southeast 10 to 20 kt. Chance of showers and thunderstorms in the afternoon. Waves 1 to 3 ft.

MONDAY NIGHT
North winds 10 to 20 kt increasing to 15 to 25 kt. Chance of showers and thunderstorms in the evening, then chance of showers overnight. Waves 2 to 4 ft building to 4 to 6 ft occasionally to 8 ft.

TUESDAY
North winds to 30 kt increasing to gales to 35 kt. Waves 4 to 7 ft occasionally to 9 ft.

TUESDAY NIGHT
North winds to 30 kt diminishing to 10 to 20 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to 2 to 4 ft.

WEDNESDAY
North winds 10 to 20 kt increasing to 30 kt. Waves 1 to 3 ft.

THURSDAY
Southeast winds 10 to 15 kt becoming southwest 10 to 20 kt. Waves 1 to 2 ft.

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LMZ080-669-671-673-675-777-779-870-872-874-876-878-261515
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
353 AM CDT Sun Jul 26 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

TODAY
Southwest winds 10 to 15 kt becoming south 10 to 20 kt. Waves 1 to 2 ft.

TONIGHT
South winds 10 to 15 kt. Slight chance of showers and thunderstorms in the evening, then chance of showers and slight chance of thunderstorms overnight. Waves 1 to 3 ft.

MONDAY
South winds 10 to 15 kt increasing to 10 to 20 kt. Showers likely in the morning, then chance of showers in the afternoon. Waves 1 to 3 ft.

MONDAY NIGHT
West winds 10 to 20 kt veering to north 15 to 25 kt. Chance of showers and thunderstorms in the evening, then chance of showers overnight. Waves 2 to 4 ft building to 4 to 7 ft occasionally to 9 ft.

TUESDAY
North winds to 30 kt increasing to gales to 35 kt. Waves 6 to 9 ft occasionally to 12 ft building to 8 to 11 ft occasionally to 14 ft.

TUESDAY NIGHT
North gales to 35 kt diminishing to 10 to 20 kt. Waves 7 to 10 ft occasionally to 13 ft subsiding to 5 to 8 ft occasionally to 10 ft.

WEDNESDAY
North winds 10 to 20 kt increasing to 30 kt. Waves 3 to 5 ft.

THURSDAY
East winds 10 to 15 kt becoming northeast 10 to 20 kt. Waves 1 to 3 ft.

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LMZ761-261515
MAFOR 2610/ MICHIGAN NORTH 11610 12500 14410 11510. A chance of showers and thunderstorms tonight. Waves 2 feet or less.

MICHIGAN SOUTH 11510 11500 11400 14410 11410. A chance of showers overnight. Waves 2 feet or less.

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Quigley

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

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