090
FZUS53 KDTX 180805
NSHDTX

Nearshore Marine Forecast for Michigan
National Weather Service Detroit/Pontiac MI
405 AM EDT Mon Aug 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-
405 AM EDT Mon Aug 18 2025

.TODAY...East winds 15 to 20 knots diminishing to 10 to 15 knots
in the late morning and afternoon. Mostly sunny. Waves 1 to
3 feet.
.TONIGHT...East winds 10 to 15 knots becoming southeast 15 to
20 knots in the late evening and overnight. Partly cloudy. A
chance of showers and thunderstorms after midnight. Waves 1 to
3 feet.
.TUESDAY...South winds 15 to 20 knots diminishing to 10 to
15 knots in the late morning and afternoon. Mostly cloudy until
late afternoon becoming partly cloudy. Showers likely and a
chance of thunderstorms until late afternoon, then a chance of
showers and thunderstorms early in the afternoon. A chance of
waterspouts early in the afternoon. Waves 1 to 3 feet.
.TUESDAY NIGHT...Southwest winds 10 to 15 knots veering to the
north in the late evening and overnight. A chance of waterspouts
until early morning. Partly cloudy with a chance of showers and
thunderstorms early in the evening, then mostly cloudy in the
late evening and overnight. Waves 2 feet or less.

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-
405 AM EDT Mon Aug 18 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL NOON EDT TODAY...

.TODAY...East winds 15 to 20 knots diminishing to 10 to 15 knots
in the late morning and afternoon. Mostly sunny. Waves 3 to
5 feet subsiding to 1 to 3 feet late in the afternoon. Waves
occasionally around 7 feet.
.TONIGHT...East winds 10 to 15 knots becoming southeast 15 to
20 knots in the late evening and overnight. Partly cloudy. A
chance of showers and a slight chance of thunderstorms after
midnight. Waves 1 to 3 feet.
.TUESDAY...South winds 15 to 20 knots diminishing to 10 to
15 knots in the late morning and afternoon. Mostly cloudy.
Showers likely and a chance of thunderstorms until late
afternoon, then a chance of showers and thunderstorms early in
the afternoon. A chance of waterspouts early in the afternoon.
Waves 1 to 3 feet.
.TUESDAY NIGHT...South winds 10 to 15 knots backing to the north
in the late evening and overnight. Partly cloudy early in the
evening becoming mostly cloudy. A chance of thunderstorms early
in the evening. A chance of showers until early morning. A chance
of waterspouts. Waves 1 to 3 feet.

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

$$

LHZ441-181615-
Port Austin to Harbor Beach MI-
405 AM EDT Mon Aug 18 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL NOON EDT TODAY...

.TODAY...East winds 15 to 20 knots diminishing to 5 to 10 knots.
Mostly sunny. Waves 3 to 5 feet subsiding to 1 to 3 feet late in
the afternoon. Waves occasionally around 7 feet.
.TONIGHT...Southeast winds 10 to 15 knots increasing to 15 to
20 knots after midnight. Partly cloudy. A chance of showers and a
slight chance of thunderstorms after midnight. Waves 1 to 3 feet
building to 2 to 4 feet after midnight.
.TUESDAY...Southeast winds 15 to 20 knots becoming south 10 to
15 knots in the late morning and afternoon. Mostly cloudy.
Showers likely and a chance of thunderstorms until late
afternoon, then a chance of showers and thunderstorms early in
the afternoon. A chance of waterspouts early in the afternoon.
Waves 2 to 4 feet subsiding to 1 to 3 feet early in the
afternoon.
.TUESDAY NIGHT...Southeast winds 5 to 10 knots becoming southwest
10 to 15 knots in the late evening and early morning, then
veering to the north after midnight. Mostly cloudy. A chance of
thunderstorms early in the evening. A chance of showers until
early morning. A chance of waterspouts. Waves 1 to 3 feet.

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

$$

LHZ442-181615-
Harbor Beach to Port Sanilac MI-
405 AM EDT Mon Aug 18 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING...

.TODAY...East winds 15 to 20 knots diminishing to 5 to 10 knots
in the afternoon. Mostly sunny. Waves 3 to 5 feet subsiding to 2
to 4 feet this morning then subsiding to 1 to 3 feet in the
afternoon.
.TONIGHT...East winds 5 to 10 knots becoming southeast 10 to
15 knots in the late evening and overnight. Partly cloudy. A
slight chance of showers and thunderstorms after midnight. Waves
2 feet or less building to 2 to 4 feet after midnight.
.TUESDAY...Southeast winds 10 to 15 knots. Mostly cloudy. Showers
likely in the late morning and early afternoon. A chance of
thunderstorms in the late morning and afternoon. A chance of
showers early in the afternoon. A chance of waterspouts early in
the afternoon. Waves 2 to 4 feet subsiding to 1 to 3 feet in the
late morning and afternoon.
.TUESDAY NIGHT...South winds 5 to 10 knots becoming northwest
10 to 15 knots after midnight. Mostly cloudy. A chance of
thunderstorms early in the evening. A chance of showers until
early morning. A chance of waterspouts. Waves 2 feet or less.

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

$$

LHZ443-181615-
Port Sanilac to Port Huron MI-
405 AM EDT Mon Aug 18 2025

...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING...

.TODAY...East winds 15 to 20 knots diminishing to 5 to 10 knots
in the afternoon. Mostly sunny. Waves 3 to 5 feet subsiding to 2
to 4 feet this morning then subsiding to 1 to 3 feet in the
afternoon.
.TONIGHT...East winds 5 to 10 knots becoming southeast 10 to
15 knots in the late evening and overnight. Mostly clear. A
slight chance of showers and thunderstorms after midnight. Waves
2 feet or less.
.TUESDAY...Southeast winds 10 to 15 knots becoming south 5 to
10 knots early in the afternoon. Partly cloudy with a chance of
showers early in the morning, then mostly cloudy with a chance of
showers and thunderstorms in the late morning and afternoon.
Waves 1 to 3 feet.
.TUESDAY NIGHT...South winds 5 to 10 knots becoming northwest
10 to 15 knots after midnight. Mostly cloudy becoming partly
cloudy in the late evening and early morning becoming mostly
cloudy. A chance of thunderstorms early in the evening. A chance
of showers until early morning. A chance of waterspouts after
midnight. Waves 2 feet or less.

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-
405 AM EDT Mon Aug 18 2025

.TODAY...East winds 10 to 15 knots. Mostly sunny. Waves 1 to
3 feet.
.TONIGHT...East winds 10 to 15 knots becoming southeast 5 to
10 knots after midnight. Mostly clear. Waves 1 to 3 feet.
.TUESDAY...Southeast winds 5 to 10 knots. Mostly sunny early in
the morning becoming partly cloudy. A chance of showers until
late afternoon, then a chance of showers and thunderstorms early
in the afternoon. A chance of waterspouts early in the afternoon.
Waves 2 feet or less.
.TUESDAY NIGHT...Southeast winds 5 to 10 knots veering to the
southwest in the late evening and early morning, then veering to
the northwest after midnight. Partly cloudy. A chance of
thunderstorms early in the evening. A chance of showers until
early morning. A chance of waterspouts. Waves 2 feet or less.

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

The water temperature at Belle Isle is 78 degrees.

$$

BT

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a www.weather.gov/greatlakes