652
FZUS53 KDTX 181346
NSHDTX

Nearshore Marine Forecast for Michigan
National Weather Service Detroit/Pontiac MI
946 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.

LHZ422-182200-
Inner Saginaw Bay SW of Point Au Gres to Bay Port MI-
946 AM EDT Mon Aug 18 2025

.REST OF TODAY...East winds 10 to 15 knots. 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. Waves 1 to
3 feet.
.TUESDAY NIGHT...Southwest winds 10 to 15 knots veering to the
north in the late evening and overnight. 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.

$$

LHZ421-182200-
Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner
Saginaw Bay-
946 AM EDT Mon Aug 18 2025

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

.REST OF TODAY...East winds 10 to 15 knots. 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. 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. Waves
1 to 3 feet.

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

$$

LHZ441-182200-
Port Austin to Harbor Beach MI-
946 AM EDT Mon Aug 18 2025

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

.REST OF TODAY...East winds 10 to 15 knots diminishing to 5 to
10 knots late in the afternoon. Mostly sunny. Waves 2 to 4 feet
subsiding to 1 to 3 feet late in the afternoon.
.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. 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. Waves 1 to 3 feet.

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

$$

LHZ442-182200-
Harbor Beach to Port Sanilac MI-
946 AM EDT Mon Aug 18 2025

.REST OF TODAY...East winds 10 to 15 knots diminishing to 5 to
10 knots in the afternoon. Mostly sunny. Waves 2 to 4 feet
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 and a chance of thunderstorms. 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. Waves 2 feet or less.

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

$$

LHZ443-182200-
Port Sanilac to Port Huron MI-
946 AM EDT Mon Aug 18 2025

.REST OF TODAY...East winds 10 to 15 knots diminishing to 5 to
10 knots in the afternoon. Mostly sunny. Waves 2 to 4 feet
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 and a slight chance of thunderstorms 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. Waves 2 feet or less.

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

$$

LEZ444-182200-
Michigan Waters of Lake Erie from Detroit River to North Cape MI-
946 AM EDT Mon Aug 18 2025

.REST OF 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. 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. Waves 2 feet or less.

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

The water temperature at Belle Isle is 77 degrees.

$$

JA

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