488
FZUS53 KDTX 220139
NSHDTX

Nearshore Marine Forecast for Michigan
National Weather Service Detroit/Pontiac MI
939 PM EDT Thu Aug 21 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.

LHZ422-220945-
Inner Saginaw Bay SW of Point Au Gres to Bay Port MI-
939 PM EDT Thu Aug 21 2025

.REST OF TONIGHT...East winds 5 to 10 knots in the late evening
and early morning becoming light and variable. Mostly clear.
Waves 2 feet or less.
.FRIDAY...Light and variable winds becoming southwest 5 to
10 knots in the late morning and afternoon. Mostly sunny. Waves
2 feet or less.
.FRIDAY NIGHT...South winds 5 to 10 knots becoming southwest
10 to 15 knots in the late evening and overnight. Partly cloudy
until early morning becoming mostly cloudy. Waves 2 feet or less.
.SATURDAY...Southwest winds 10 to 15 knots increasing to 15 to
20 knots early in the afternoon. Partly cloudy until late
afternoon becoming mostly sunny. A chance of showers until late
afternoon, then showers likely and a chance of thunderstorms
early in the afternoon. Waves 1 to 3 feet.

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

$$

LHZ421-220945-
Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner
Saginaw Bay-
939 PM EDT Thu Aug 21 2025

.REST OF TONIGHT...Northeast winds 5 to 10 knots in the late
evening and early morning becoming light and variable. Mostly
clear. Waves 2 feet or less.
.FRIDAY...Light and variable winds becoming southwest 5 to
10 knots in the late morning and afternoon. Mostly sunny. Waves
2 feet or less.
.FRIDAY NIGHT...South winds 5 to 10 knots becoming southwest
10 to 15 knots in the late evening and overnight. Partly cloudy
until early morning becoming mostly cloudy. Waves 2 feet or less.
.SATURDAY...Southwest winds 10 to 15 knots increasing to 15 to
20 knots early in the afternoon. Mostly cloudy becoming partly
cloudy in the late morning and early afternoon becoming mostly
sunny. A chance of showers until late afternoon, then showers
likely and a chance of thunderstorms early in the afternoon.
Waves 1 to 3 feet.

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

$$

LHZ441-220945-
Port Austin to Harbor Beach MI-
939 PM EDT Thu Aug 21 2025

.REST OF TONIGHT...Northeast winds 5 to 10 knots in the late
evening and early morning becoming light and variable. Mostly
clear. Waves 2 feet or less.
.FRIDAY...Light and variable winds becoming southwest 5 to
10 knots in the late morning and early afternoon, then backing to
the south early in the afternoon. Mostly sunny. Areas of fog
early in the morning. Waves 2 feet or less.
.FRIDAY NIGHT...South winds 5 to 10 knots increasing to 10 to
15 knots in the late evening and overnight. Partly cloudy until
early morning becoming mostly cloudy. Waves 2 feet or less.
.SATURDAY...Southwest winds 10 to 15 knots. Mostly cloudy with a
chance of showers until late afternoon, then partly cloudy with
showers likely and a chance of thunderstorms early in the
afternoon. Waves 1 to 3 feet.

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

$$

LHZ442-220945-
Harbor Beach to Port Sanilac MI-
939 PM EDT Thu Aug 21 2025

.REST OF TONIGHT...Northeast winds 10 to 15 knots becoming east
5 to 10 knots after midnight. Partly cloudy. Waves 1 to 3 feet.
.FRIDAY...Light and variable winds becoming southeast 5 to
10 knots early in the afternoon. Mostly sunny. Patchy fog early
in the morning. Waves 2 feet or less.
.FRIDAY NIGHT...South winds 5 to 10 knots becoming southwest
10 to 15 knots after midnight. Partly cloudy until early morning
becoming mostly cloudy. Waves 2 feet or less.
.SATURDAY...Southwest winds 5 to 10 knots increasing to 10 to
15 knots in the late morning and afternoon. Mostly cloudy until
late afternoon becoming partly cloudy. Light showers likely early
in the afternoon. Waves 2 feet or less.

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

$$

LHZ443-220945-
Port Sanilac to Port Huron MI-
939 PM EDT Thu Aug 21 2025

.REST OF TONIGHT...North winds 10 to 15 knots becoming northeast
5 to 10 knots after midnight, then veering to the southeast early
in the morning. Mostly clear. Waves 1 to 3 feet.
.FRIDAY...Light and variable winds. Mostly sunny. Waves 2 feet or
less.
.FRIDAY NIGHT...Southeast winds 5 to 10 knots becoming southwest
10 to 15 knots after midnight. Partly cloudy. Waves 2 feet or
less.
.SATURDAY...Southwest winds 5 to 10 knots increasing to 10 to
15 knots in the late morning and afternoon. Partly cloudy
becoming mostly cloudy in the late morning and early afternoon
becoming partly cloudy. A chance of showers early in the
afternoon. Waves 2 feet or less.

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

$$

LEZ444-220945-
Michigan Waters of Lake Erie from Detroit River to North Cape MI-
939 PM EDT Thu Aug 21 2025

.REST OF TONIGHT...Northeast winds 10 to 15 knots diminishing to
5 to 10 knots after midnight. Mostly clear. Waves 2 feet or less.
.FRIDAY...Northeast winds 5 to 10 knots veering to the southeast
early in the afternoon. Sunny. Patchy fog early in the morning.
Waves 2 feet or less.
.FRIDAY NIGHT...Southeast winds 5 to 10 knots veering to the
southwest after midnight. Mostly clear. Waves 2 feet or less.
.SATURDAY...Southwest winds 5 to 10 knots increasing to 10 to
15 knots early in the afternoon. Partly cloudy until late
afternoon becoming mostly cloudy. Waves 2 feet or less.

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

The water temperature at Belle Isle is 74 degrees.

$$

SC

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