465
FZUS54 KHGX 181639
CWFHGX

Coastal Waters Forecast for Texas
National Weather Service Houston/Galveston TX
1139 AM CDT Mon Aug 18 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.

GMZ300-190515-
1139 AM CDT Mon Aug 18 2025

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

A weak pressure gradient will remain in place for a good part of the
week which will lead to a prevailing landbreeze and seabreeze
circulation featuring variable to offshore wind directions late at
night and in the morning and a more moderate onshore winds in the
afternoons and evenings. Models are indicating the potential for
some scattered strong storms during the first part of Tuesday
with a passing upper disturbance. Otherwise, a somewhat
unsettled weather pattern is expected as the week progresses with
chances of showers and thunderstorms on a daily basis.

$$

GMZ335-190515-
Galveston Bay-
1139 AM CDT Mon Aug 18 2025

.THIS AFTERNOON...North winds around 5 knots, becoming southeast.
Bay waters smooth. A chance of showers and thunderstorms.
.TONIGHT...Southeast winds 5 to 10 knots, becoming north after
midnight. Bay waters smooth. A chance of showers and
thunderstorms.
.TUESDAY...North winds around 5 knots, becoming southeast in the
afternoon. Bay waters smooth. Showers and thunderstorms likely.
.TUESDAY NIGHT...South winds 5 to 10 knots, becoming southwest
after midnight. Bay waters smooth.
.WEDNESDAY...Northwest winds around 5 knots, becoming east in the
afternoon. Bay waters smooth. A chance of showers and
thunderstorms.
.WEDNESDAY NIGHT...South winds 5 to 10 knots, becoming west after
midnight. Bay waters smooth. A chance of showers and
thunderstorms.
.THURSDAY...Northwest winds around 5 knots, becoming southeast in
the afternoon. Bay waters smooth. Showers likely. A chance of
thunderstorms in the morning, then thunderstorms likely in the
afternoon.
.THURSDAY NIGHT...South winds 5 to 10 knots, becoming west after
midnight. Bay waters smooth. A chance of showers and
thunderstorms.
.FRIDAY...Northwest winds around 5 knots, becoming east in the
afternoon. Bay waters smooth. Showers likely. A chance of
thunderstorms in the morning, then thunderstorms likely in the
afternoon.
.FRIDAY NIGHT...South winds 5 to 10 knots, becoming southwest
after midnight. Bay waters smooth. A chance of showers and
thunderstorms.

Winds and waves higher in and near thunderstorms.

$$

GMZ330-190515-
Matagorda Bay-
1139 AM CDT Mon Aug 18 2025

.THIS AFTERNOON...Northeast winds around 5 knots, becoming
southeast. Bay waters smooth. A slight chance of showers and
thunderstorms late.
.TONIGHT...Southeast winds 5 to 10 knots, becoming southwest
after midnight. Bay waters smooth. A slight chance of showers and
thunderstorms in the evening.
.TUESDAY...Northwest winds around 5 knots, becoming east in the
afternoon. Bay waters smooth. Showers and thunderstorms likely,
mainly in the morning.
.TUESDAY NIGHT...Southeast winds 5 to 10 knots, becoming
southwest after midnight. Bay waters smooth. A chance of showers.
A chance of thunderstorms after midnight.
.WEDNESDAY...Northwest winds around 5 knots, becoming southeast
in the afternoon. Bay waters smooth. A chance of showers. A
chance of thunderstorms in the afternoon.
.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 5 to 10 knots, becoming southeast in the
afternoon. Bay waters smooth. A chance of showers and
thunderstorms.
.THURSDAY NIGHT...Southeast winds 5 to 10 knots, becoming
southwest after midnight. Bay waters smooth. A chance of showers.
A chance of thunderstorms after midnight.
.FRIDAY...Northwest winds around 5 knots, becoming southeast in
the afternoon. Bay waters smooth. A chance of showers and
thunderstorms.
.FRIDAY NIGHT...Southeast winds 5 to 10 knots, becoming south
after midnight. Bay waters smooth. A chance of showers and
thunderstorms after midnight.

Winds and waves higher in and near thunderstorms.

$$

GMZ350-355-370-375-190515-
Coastal waters from Freeport to Matagorda Ship Channel TX out
20 NM-Coastal waters from High Island to Freeport TX out 20 NM-
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-
1139 AM CDT Mon Aug 18 2025

.THIS AFTERNOON...Northeast winds around 5 knots, becoming east
late. Seas 1 foot or less. Wave Detail: Southeast 1 foot at
5 seconds. A slight chance of thunderstorms. A chance of showers
early, then a slight chance of showers.
.TONIGHT...East winds 5 to 10 knots, becoming northeast after
midnight. Seas 1 foot or less. Wave Detail: Southeast 1 foot at
5 seconds. A chance of showers and thunderstorms after midnight.
.TUESDAY...North winds around 5 knots, becoming northeast in the
afternoon. Seas 1 foot or less. Wave Detail: Southeast 1 foot at
5 seconds. Showers and thunderstorms likely.
.TUESDAY NIGHT...Southeast winds around 5 knots, becoming south
after midnight. Seas 1 foot or less. Wave Detail: East 1 foot at
4 seconds. A chance of showers after midnight.
.WEDNESDAY...Northwest winds around 5 knots, becoming east 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. Wave Detail: South 1 foot at
2 seconds. A chance of showers and thunderstorms after midnight.
.THURSDAY...Northwest winds around 5 knots, becoming east in the
afternoon. Seas 1 foot or less. A chance of thunderstorms.
Showers likely, mainly in the morning.
.THURSDAY NIGHT...South winds 5 to 10 knots. Seas 1 foot or less.
A chance of showers and thunderstorms after midnight.
.FRIDAY...West winds 5 to 10 knots, becoming east in the
afternoon. Seas 1 foot or less. Showers likely with a chance of
thunderstorms in the morning.
.FRIDAY NIGHT...South winds around 5 knots. Seas 1 foot or less.
A chance of showers and thunderstorms after midnight.

Winds and seas higher in and near thunderstorms.

$$