395
FZUS54 KHGX 171147
CWFHGX

Coastal Waters Forecast for Texas
National Weather Service Houston/Galveston TX
647 AM CDT Sun Aug 17 2025

Upper Texas coastal waters from High Island to the Matagorda Ship
Channel out 60 nautical miles including Galveston and Matagorda
Bays.

Seas are provided as a range of the average height of the highest
1/3 of the waves...along with the occasional height of the
average highest 10 percent of the waves.

GMZ300-180030-
647 AM CDT Sun Aug 17 2025

.Synopsis For High Island to the Matagorda Ship Channel Out 60 NM
including Galveston and Matagorda Bays.

Surface high pressure will keep winds and seas low over the next
several days. We should see an evident landbreeze and seabreeze
circulation emerge on a daily basis with light offshore winds late
at night and in the mornings followed by an onshore direction in
the afternoons and evenings. Near the coast, winds may become
gusty in the late afternoon and evening hours as the sea breeze
pushes inland. A daily risk of isolated to scattered showers and
thunderstorms continues through the forecast period. Onshore winds
may increase somewhat by the second half of the week.

$$

GMZ335-180030-
Galveston Bay-
647 AM CDT Sun Aug 17 2025

.TODAY...Northwest winds around 5 knots, becoming southeast
around 5 knots early this afternoon, then increasing to 10 to
15 knots late. Bay waters smooth, increasing to slightly choppy
late. A slight chance of showers and thunderstorms late.
.TONIGHT...South winds 10 to 15 knots with gusts up to 20 knots,
becoming southwest around 10 knots after midnight. Bay waters
slightly choppy, diminishing to smooth after midnight. A chance
of showers and thunderstorms, mainly in the evening.
.MONDAY...Northwest winds around 5 knots, becoming east in the
afternoon. Bay waters smooth. A chance of showers and
thunderstorms.
.MONDAY NIGHT...Southeast winds 10 to 15 knots, becoming
southwest around 5 knots after midnight. Bay waters slightly
choppy, diminishing to smooth after midnight. A chance of showers
and thunderstorms.
.TUESDAY...North winds around 5 knots, becoming east in the
afternoon. Bay waters smooth. A chance of showers and
thunderstorms.
.TUESDAY NIGHT...South winds 10 to 15 knots, becoming west around
10 knots after midnight. Bay waters slightly choppy, diminishing
to smooth after midnight. A chance of showers and thunderstorms
after midnight.
.WEDNESDAY...Northwest winds 5 to 10 knots, becoming east in the
afternoon. Bay waters smooth. A chance of showers and
thunderstorms.
.WEDNESDAY NIGHT...South winds 10 to 15 knots, becoming southwest
around 10 knots after midnight. Bay waters slightly choppy,
diminishing to smooth after midnight. A chance of showers and
thunderstorms in the evening.
.THURSDAY...West winds around 10 knots, becoming south 10 to
15 knots in the afternoon. Bay waters smooth, increasing to
slightly choppy in the afternoon. A chance of showers and
thunderstorms in the morning, then showers and thunderstorms
likely in the afternoon.
.THURSDAY NIGHT...South winds 10 to 15 knots, becoming southwest
around 5 knots after midnight. Bay waters slightly choppy,
diminishing to smooth after midnight. A chance of showers and
thunderstorms.

Winds and waves higher in and near thunderstorms.

$$

GMZ330-180030-
Matagorda Bay-
647 AM CDT Sun Aug 17 2025

.TODAY...South winds around 10 knots, becoming southeast 10 to
15 knots with gusts up to 20 knots late. Bay waters smooth,
increasing to slightly choppy late.
.TONIGHT...Southeast winds 10 to 15 knots with gusts up to
20 knots, becoming south around 10 knots after midnight. Bay
waters slightly choppy, diminishing to smooth after midnight.
.MONDAY...West winds around 5 knots, becoming southeast in the
afternoon. Bay waters smooth.
.MONDAY NIGHT...South winds 10 to 15 knots, diminishing to around
5 knots after midnight. Bay waters slightly choppy, diminishing
to smooth after midnight.
.TUESDAY...Northwest winds around 5 knots, becoming southeast
10 to 15 knots in the afternoon. Bay waters smooth, increasing to
slightly choppy in the afternoon. A chance of showers and
thunderstorms.
.TUESDAY NIGHT...South winds 10 to 15 knots, becoming southwest
around 10 knots after midnight. Bay waters slightly choppy,
diminishing to smooth after midnight.
.WEDNESDAY...Northwest winds around 5 knots, becoming southeast
in the afternoon. Bay waters smooth. A chance of showers and
thunderstorms.
.WEDNESDAY NIGHT...South winds 10 to 15 knots, becoming southwest
around 10 knots after midnight. Bay waters slightly choppy,
diminishing to smooth after midnight. A chance of showers and
thunderstorms after midnight.
.THURSDAY...West winds around 5 knots, becoming south 10 to
15 knots in the afternoon. Bay waters smooth, increasing to
slightly choppy in the afternoon. A chance of showers and
thunderstorms.
.THURSDAY NIGHT...South winds 10 to 15 knots, diminishing to
around 10 knots after midnight. Bay waters slightly choppy,
diminishing to smooth after midnight. A chance of showers and
thunderstorms after midnight.

Winds and waves higher in and near thunderstorms.

$$

GMZ350-355-180030-
Coastal waters from Freeport to Matagorda Ship Channel TX out
20 NM-Coastal waters from High Island to Freeport TX out 20 NM-
647 AM CDT Sun Aug 17 2025

.TODAY...South winds 5 to 10 knots, becoming southeast this
afternoon. Seas around 2 feet. Wave Detail: Southeast 2 feet at
6 seconds.
.TONIGHT...Southeast winds 5 to 10 knots, becoming southwest
after midnight. Seas around 2 feet. Wave Detail: Southeast 2 feet
at 5 seconds. A slight chance of showers and thunderstorms.
.MONDAY...Northwest winds 5 to 10 knots, becoming east in the
afternoon. Seas 1 foot or less. Wave Detail: South 1 foot at
5 seconds. A chance of showers and thunderstorms in the morning.
.MONDAY NIGHT...Southeast winds 5 to 10 knots, becoming southwest
after midnight. Seas 1 foot or less. Wave Detail: Southeast
1 foot at 5 seconds. A chance of showers and thunderstorms after
midnight.
.TUESDAY...Northwest winds around 5 knots, becoming east in the
afternoon. Seas 1 foot or less. Wave Detail: Southeast 1 foot at
5 seconds. A chance of showers and thunderstorms in the morning.
.TUESDAY NIGHT...South winds 5 to 10 knots, becoming southwest
after midnight. Seas 1 foot or less. Wave Detail: Southeast
1 foot at 4 seconds. A chance of showers and thunderstorms after
midnight.
.WEDNESDAY...Northwest winds 5 to 10 knots, becoming south in the
afternoon. Seas 1 foot or less. A chance of showers and
thunderstorms in the morning.
.WEDNESDAY NIGHT...South winds 5 to 10 knots, becoming southwest
after midnight. Seas around 2 feet.
.THURSDAY...West winds 5 to 10 knots, becoming southwest in the
afternoon. Seas around 2 feet. A chance of showers and
thunderstorms.
.THURSDAY NIGHT...South winds 5 to 10 knots. Seas around 2 feet.
A chance of showers and thunderstorms after midnight.

Winds and seas higher in and near thunderstorms.

$$

GMZ370-375-180030-
Waters from Freeport to Matagorda Ship Channel TX from 20 to
60 NM-Waters from High Island to Freeport TX from 20 to 60 NM-
647 AM CDT Sun Aug 17 2025

.TODAY...South winds around 5 knots, becoming east around 5 knots
late this morning and afternoon. Seas around 2 feet. Wave Detail:
Southeast 2 feet at 6 seconds.
.TONIGHT...Southeast winds around 5 knots, becoming south after
midnight. Seas around 2 feet. Wave Detail: Southeast 2 feet at
5 seconds. A slight chance of showers and thunderstorms after
midnight.
.MONDAY...Northwest winds 5 to 10 knots, becoming northeast in
the afternoon. Seas 1 foot or less. Wave Detail: Southeast 1 foot
at 5 seconds. A chance of showers and thunderstorms in the
morning.
.MONDAY NIGHT...Southeast winds around 5 knots. Seas 1 foot or
less. Wave Detail: Southeast 1 foot at 5 seconds. A chance of
showers and thunderstorms after midnight.
.TUESDAY...Northwest winds around 5 knots, becoming northeast
around 5 knots in the afternoon. Seas 1 foot or less. Wave
Detail: Southeast 1 foot at 5 seconds. A chance of showers and
thunderstorms in the morning.
.TUESDAY NIGHT...Southeast winds around 5 knots, becoming
southwest after midnight. Seas 1 foot or less. Wave Detail: East
1 foot at 4 seconds. A chance of showers and thunderstorms after
midnight.
.WEDNESDAY...Northwest winds 5 to 10 knots, becoming northeast in
the afternoon. Seas 1 foot or less. A chance of showers and
thunderstorms in the morning.
.WEDNESDAY NIGHT...South winds 5 to 10 knots, becoming southwest
after midnight. Seas 1 foot or less, then around 2 feet after
midnight.
.THURSDAY...West winds around 5 knots. Seas 1 foot or less. A
chance of showers and thunderstorms in the morning.
.THURSDAY NIGHT...South winds 5 to 10 knots. Seas around 2 feet.
A chance of showers and thunderstorms after midnight.

Winds and seas higher in and near thunderstorms.

$$