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National Weather Service Marine Forecast FZUS63 KMKX

FZUS63 KMKX 120836
GLFLM

OPEN LAKE FORECAST for Lake Michigan
National Weather Service Milwaukee/Sullivan WI
236 AM CST Mon Jan 12 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

Breezy southwest winds will continue this morning as the region remains situated between high pressure of 30.5 inches over the Tennessee Valley and low pressure of 29.5 inches over Hudson Bay. Winds will gradually ease today as both features move east.

Breezy south to southwest winds are expected Tuesday ahead of another low pressure system around 29.3 inches. This low pressure system will track east across Lake Superior Tuesday afternoon, shifting winds to northwesterly Tuesday night. There is increasing potential for gales and moderate freezing spray late Tuesday night and through the day on Wednesday in association with this system.

LMZ261-362-364-366-563-565-567-868-121615
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
236 AM CST Mon Jan 12 2026

SHEBOYGAN WI TO PENTWATER MI NORTH...

TODAY
West winds 15 to 25 kt diminishing to 10 to 20 kt. Waves 5 to 8 ft occasionally to 10 ft subsiding to 3 to 5 ft.

TONIGHT
Southwest winds 10 to 20 kt increasing to 15 to 25 kt. Chance of rain overnight. Waves 2 to 4 ft building to 3 to 5 ft.

TUESDAY
Southwest winds 15 to 25 kt becoming west. Rain likely with snow in the morning, then chance of rain in the afternoon. Waves 4 to 7 ft occasionally to 9 ft building to 6 to 9 ft occasionally to 12 ft.

TUESDAY NIGHT
West winds 10 to 20 kt becoming northwest to 30 kt overnight. Chance of snow in the evening, then chance of snow and rain overnight. Waves 4 to 7 ft occasionally to 9 ft building to 7 to 10 ft occasionally to 13 ft.

WEDNESDAY
North gales to 35 kt increasing to gales to 40 kt. Freezing spray. Chance of snow. Waves 12 to 16 ft occasionally to 21 ft.

WEDNESDAY NIGHT
North gales to 35 kt diminishing to 30 kt. Freezing spray. Waves 10 to 14 ft occasionally to 18 ft subsiding to 8 to 11 ft occasionally to 14 ft.

THURSDAY
North winds 10 to 20 kt becoming west 10 to 15 kt. Waves 4 to 7 ft occasionally to 9 ft subsiding to 3 to 5 ft.

FRIDAY
South winds 10 to 20 kt. Chance of snow. Waves 4 to 6 ft occasionally to 8 ft.

LMZ080-669-671-673-675-777-779-870-872-874-876-878-121615
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
236 AM CST Mon Jan 12 2026

SHEBOYGAN WI TO PENTWATER MI SOUTH...

TODAY
West winds to 30 kt becoming southwest 10 to 20 kt. Waves 7 to 10 ft occasionally to 13 ft subsiding to 4 to 6 ft occasionally to 8 ft.

TONIGHT
Southwest winds 10 to 20 kt increasing to 15 to 25 kt. Chance of rain overnight. Waves 4 to 6 ft occasionally to 8 ft.

TUESDAY
Southwest winds to 30 kt becoming west 15 to 25 kt. Chance of rain. Waves 7 to 10 ft occasionally to 13 ft.

TUESDAY NIGHT
West winds 10 to 20 kt becoming northwest to 30 kt overnight. Chance of rain and snow overnight. Waves 6 to 9 ft occasionally to 12 ft.

WEDNESDAY
North gales to 35 kt increasing to gales to 40 kt. Snow and rain in the morning, then snow in the afternoon. Waves 12 to 16 ft occasionally to 21 ft.

WEDNESDAY NIGHT
North gales to 35 kt diminishing to 30 kt. Freezing spray. Chance of snow. Waves 12 to 16 ft occasionally to 21 ft.

THURSDAY
North winds 15 to 25 kt becoming northwest 10 to 20 kt. Waves 7 to 10 ft occasionally to 13 ft subsiding to 4 to 7 ft occasionally to 9 ft.

FRIDAY
Southwest winds 10 to 20 kt. Snow likely. Waves 4 to 7 ft occasionally to 9 ft.

LMZ761-121615
MAFOR 1211/ MICHIGAN NORTH 13630 12620 12520 11530. Waves 5 to 8 feet subsiding to 2 to 4 feet today. Waves 2 to 4 feet tonight.

MICHIGAN SOUTH 11640 11630 11530 14520 11530. Waves 5 to 9 feet subsiding to 3 to 6 feet today. Waves 2 to 4 feet building to 3 to 5 feet tonight.

Boxell

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

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