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FZUS53 KDTX 180809
NSHDTX

Nearshore Marine Forecast for Michigan
National Weather Service Detroit/Pontiac MI
409 AM EDT Sat Oct 18 2025

For waters within five nautical miles of shore

Waves are the significant wave height - the average of the highest
1/3 of the wave spectrum. Occasional wave height is the average of
the highest 1/10 of the wave spectrum.

LHZ422-181615-
Inner Saginaw Bay SW of Point Au Gres to Bay Port MI-
409 AM EDT Sat Oct 18 2025

...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH LATE SUNDAY
NIGHT...

.TODAY...South winds 15 to 20 knots diminishing to 10 to 15 knots
in the late morning and afternoon. Partly cloudy in the morning
becoming mostly cloudy. Light showers likely and a slight chance
of thunderstorms. Waves 1 to 3 feet.
.TONIGHT...South winds 10 to 15 knots. Light showers likely and a
slight chance of thunderstorms until early morning, then showers
and a slight chance of thunderstorms after midnight. A slight
chance of waterspouts in the late evening and early morning.
Waves 2 feet or less.
.SUNDAY...South winds 15 to 20 knots veering to the southwest in the
late morning and early afternoon, then becoming west 20 to 25 knots
with gusts to 30 knots early in the afternoon. Rain showers. Waves 1
to 3 feet building to 3 to 5 feet early in the afternoon. Waves
occasionally around 7 feet. A Small Craft Advisory may be needed.
.SUNDAY NIGHT...Northwest winds to 30 knots becoming west 20 to 25
knots after midnight. Gusts to 35 knot gales. Rain showers early in
the evening, then partly cloudy with a chance of showers in the late
evening and early morning. Mostly clear after midnight. Waves 3 to 5
feet. Waves occasionally around 7 feet. A Gale Warning may be needed.

See Lake Huron Open Lake Forecast for days 3 through 5.

$$

LHZ421-181615-
Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner
Saginaw Bay-
409 AM EDT Sat Oct 18 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 PM EDT THIS AFTERNOON...
...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH LATE SUNDAY
NIGHT...

.TODAY...South winds 15 to 20 knots becoming southwest 10 to
15 knots in the afternoon. Partly cloudy with a chance of showers
and a slight chance of thunderstorms in the morning, then mostly
cloudy with showers likely and a slight chance of thunderstorms
in the afternoon. Waves 2 to 4 feet subsiding to 1 to 3 feet in
the late morning and afternoon.
.TONIGHT...South winds 10 to 15 knots. A slight chance of
waterspouts until early morning. Light showers likely and a
slight chance of thunderstorms until early morning, then showers
and a slight chance of thunderstorms after midnight. Waves 2 feet
or less.
.SUNDAY...South winds 15 to 20 knots with gusts to 30 knots
becoming west 20 to 25 knots with gusts to 30 knots early in the
afternoon. Rain showers. Waves 2 to 4 feet building to 5 to
7 feet. Waves occasionally around 10 feet.
.SUNDAY NIGHT...Northwest winds to 30 knots with gusts to 35 knot
gales. Becoming mostly clear after midnight. Rain showers early in
the evening, then a chance of showers in the late evening and early
morning. Waves 6 to 9 feet. Waves occasionally around 12 feet. A Gale
Warning may be needed.

See Lake Huron Open Lake Forecast for days 3 through 5.

$$

LHZ441-181615-
Port Austin to Harbor Beach MI-
409 AM EDT Sat Oct 18 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 PM EDT THIS AFTERNOON...
...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH LATE SUNDAY
NIGHT...

.TODAY...South winds 15 to 20 knots diminishing to 10 to 15 knots
in the late morning and afternoon. Partly cloudy with a chance of
showers in the morning, then mostly cloudy with showers likely
and a chance of thunderstorms in the afternoon. Waves 2 to 4 feet
subsiding to 1 to 3 feet in the afternoon.
.TONIGHT...South winds 10 to 15 knots diminishing to 5 to
10 knots in the late evening and early morning, then increasing
to 10 to 15 knots after midnight. A slight chance of waterspouts
early in the evening. Light showers likely and a chance of
thunderstorms until early morning, then showers and a slight
chance of thunderstorms after midnight. Waves 1 to 3 feet.
.SUNDAY...South winds 15 to 20 knots increasing to 20 to 25 knots
in the late morning and early afternoon, then veering to the west
with gusts to 30 knots early in the afternoon. Rain showers.
Waves 3 to 5 feet building to 5 to 7 feet early in the afternoon.
Waves occasionally around 10 feet.
.SUNDAY NIGHT...Northwest winds to 30 knots with gusts to 35 knot
gales. Becoming partly cloudy after midnight. Rain showers early in
the evening, then showers likely in the late evening and early
morning. Waves 8 to 12 feet. Waves occasionally around 15 feet. A
Gale Warning may be needed.

See Lake Huron Open Lake Forecast for days 3 through 5.

$$

LHZ442-181615-
Harbor Beach to Port Sanilac MI-
409 AM EDT Sat Oct 18 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 PM EDT THIS AFTERNOON...
...GALE WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH LATE SUNDAY
NIGHT...

.TODAY...South winds 15 to 20 knots diminishing to 10 to 15 knots
in the afternoon. Partly cloudy with a chance of showers in the
morning, then mostly cloudy with showers likely and a slight
chance of thunderstorms in the afternoon. Waves 2 to 4 feet
subsiding to 1 to 3 feet late in the afternoon.
.TONIGHT...South winds 10 to 15 knots. Showers and a chance of
thunderstorms. Waves 1 to 3 feet.
.SUNDAY...South winds 15 to 20 knots becoming southwest 20 to
25 knots with gusts to 30 knots in the late morning and
afternoon. Rain showers. Waves 3 to 5 feet. Waves occasionally
around 7 feet.
.SUNDAY NIGHT...Northwest winds to 30 knots with gusts to 35 knot
gales diminishing to 20 to 25 knots after midnight. Mostly cloudy
with showers likely until early morning, then partly cloudy with a
chance of showers after midnight. Waves 5 to 7 feet. Waves
occasionally around 10 feet. A Gale Warning may be needed.

See Lake Huron Open Lake Forecast for days 3 through 5.

$$

LHZ443-181615-
Port Sanilac to Port Huron MI-
409 AM EDT Sat Oct 18 2025

.TODAY...South winds 15 to 20 knots diminishing to 10 to 15 knots
in the afternoon. Partly cloudy. A slight chance of showers in
the morning, then a slight chance of showers and thunderstorms in
the afternoon. Waves 2 to 4 feet subsiding to 1 to 3 feet in the
afternoon.
.TONIGHT...South winds 10 to 15 knots. Light showers and a chance
of thunderstorms until early morning, then showers and a slight
chance of thunderstorms after midnight. Waves 1 to 3 feet.
.SUNDAY...South winds 15 to 20 knots becoming southwest 20 to 25
knots with gusts to 30 knots in the late morning and afternoon. Rain
showers until late afternoon, then showers early in the afternoon.
Waves 3 to 5 feet. Waves occasionally around 7 feet. A Small Craft
Advisory may be needed.
.SUNDAY NIGHT...West winds to 30 knots diminishing to 20 to
25 knots after midnight. Becoming partly cloudy after midnight.
Light showers early in the evening, then showers likely in the
late evening and early morning. A chance of showers after
midnight. Waves 3 to 5 feet. Waves occasionally around 7 feet.

See Lake Huron Open Lake Forecast for days 3 through 5.

$$

LEZ444-181615-
Michigan Waters of Lake Erie from Detroit River to North Cape MI-
409 AM EDT Sat Oct 18 2025

.TODAY...South winds 10 to 15 knots. Mostly sunny with a slight
chance of showers in the morning, then partly cloudy with showers
likely and a slight chance of thunderstorms in the afternoon.
Waves 1 to 3 feet.
.TONIGHT...South winds 15 to 20 knots. Light showers and a chance
of thunderstorms until early morning, then showers and a slight
chance of thunderstorms after midnight. Waves 1 to 3 feet
building to 3 to 5 feet after midnight. Waves occasionally around
7 feet.
.SUNDAY...South winds 20 to 25 knots with gusts to 30 knots
veering to the west with gusts to 30 knots early in the
afternoon. Rain showers. Waves 4 to 6 feet. Waves occasionally
around 8 feet.
.SUNDAY NIGHT...West winds 20 to 25 knots. Gusts to 30 knots
until early morning. Light showers early in the evening, then
mostly cloudy with a chance of showers in the late evening and
early morning. Mostly clear after midnight. Waves 2 to 4 feet.

See Lake Erie Open Lake Forecast for days 3 through 5.

The water temperature at Belle Isle is 61 degrees.

$$

AA

You can obtain your latest National Weather Service forecasts online
a www.weather.gov/greatlakes