(1/2)
Latest Great Lakes Marine Forecast by KMKX
Issued 9/15/2025 2:36 PM US/Central.
Valid through 9/15/2025 10:15 PM US/Central.
fzus63 kmkx 151936
glflm
expires:202509160315;;039520
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
236 pm cdt mon sep 15 2025
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...
high pressure around 30.2 inches will remain over lake michigan
through wednesday as weak low pressure of 29.7 inches slowly lifts
from northern north dakota into the hudson bay today through
wednesday. expect light, generally southeasterly winds through
wednesday. a few areas of fog are possible each night through
wednesday as warm water and high pressure dominate the weather
pattern.
expecting winds to become easterly into thursday as low
pressure develops in the central plains, increasing and becoming
northeasterly thursday night into friday as low pressure
approaches. a few thunderstorms are possible along a warm front
thursday night in the northern half of the open waters.
lmz261-362-364-366-563-565-567-669-868-870-160315-
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 sheboygan to port washington wi 5 nm offshore
to mid lake-
lake michigan from pentwater to manistee mi 5 nm offshore to mid
lake-
lake michigan from whitehall to pentwater mi 5 nm offshore to mid
lake-
236 pm cdt mon sep 15 2025
port washington wi to whitehall mi north...
.tonight...northeast winds 10 to 15 kt veering to southeast.
waves 1 to 2 ft.
.tuesday...south winds 10 to 15 kt. waves 1 to 2 ft.
.tuesday night...south winds 5 to 10 kt. waves 1 ft or less.
.wednesday...south winds 10 to 15 kt becoming southwest. waves
1 ft or less.
.wednesday night...southwest winds 5 to 10 kt backing to
southeast. waves 1 ft or less.
.thursday...northeast winds 5 to 10 kt becoming north 10 to
15 kt. waves 1 to 2 ft.
.thursday night...northeast winds 10 to 20 kt. waves 2 to 4 ft.
.friday...northeast winds 10 to 20 kt. waves 2 to 4 ft.
.saturday...southeast winds 10 to 20 kt. waves 4 to 6 ft
occasionally to 8 ft subsiding to 3 to 5 ft.
$$
(2/2)
Latest Great Lakes Marine Forecast by KMKX
Issued 9/15/2025 2:36 PM US/Central.
Valid through 9/15/2025 10:15 PM US/Central.
fzus63 kmkx 151936
glflm
expires:202509160315;;039521
open lake forecast for lake michigan
national weather service milwaukee/sullivan wi
236 pm cdt mon sep 15 2025
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...
high pressure around 30.2 inches will remain over lake michigan
through wednesday as weak low pressure of 29.7 inches slowly lifts
from northern north dakota into the hudson bay today through
wednesday. expect light, generally southeasterly winds through
wednesday. a few areas of fog are possible each night through
wednesday as warm water and high pressure dominate the weather
pattern.
expecting winds to become easterly into thursday as low
pressure develops in the central plains, increasing and becoming
northeasterly thursday night into friday as low pressure
approaches. a few thunderstorms are possible along a warm front
thursday night in the northern half of the open waters.
lmz080-671-673-675-777-779-872-874-876-878-160315-
lake michigan from michigan city in to st. joseph mi 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 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 pm cdt mon sep 15 2025
port washington wi to whitehall mi south...
.tonight...northeast winds 10 to 15 kt veering to southeast.
waves 1 to 2 ft.
.tuesday...southeast winds 5 to 10 kt backing to north 10 to
15 kt. waves 1 to 2 ft.
.tuesday night...north winds 10 to 15 kt becoming east. waves
1 ft or less.
.wednesday...southeast winds 5 to 10 kt backing to northwest.
waves 1 ft or less.
.wednesday night...east winds 5 to 10 kt veering to southeast.
waves nearly calm.
.thursday...south winds 5 to 10 kt backing to northeast. waves
1 ft or less.
.thursday night...northeast winds 10 to 15 kt becoming east.
waves 2 to 4 ft.
.friday...east winds 10 to 15 kt becoming northeast. waves 2 to
4 ft.
.saturday...southeast winds 10 to 20 kt. waves 4 to 6 ft
occasionally to 8 ft subsiding to 3 to 5 ft.
$$
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