344
FZCA52 TJSJ 200711
CWFSJU

Coastal Waters Forecast
National Weather Service San Juan PR
311 AM AST Wed Aug 20 2025

Puerto Rico and the U.S. Virgin Islands Waters

AMZ700-201945-
311 AM AST Wed Aug 20 2025

.SYNOPSIS FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS WATERS...

Light to moderate southeasterly winds will continue through
midweek, becoming east-northeast from Thursday onward. A strong
tropical wave is expected to approach the eastern Caribbean on
Friday, increasing thunderstorm activity in general through Saturday.
A long period northerly swell from distant Hurricane Erin will
arrive late Friday and into the weekend, resulting in hazardous seas
for the Atlantic waters and passages.

$$

AMZ711-201945-
Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N-
311 AM AST Wed Aug 20 2025

.TODAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas
4 to 5 feet. Wave Detail: Southeast 4 feet at 5 seconds and east
3 feet at 8 seconds. Isolated showers.
.TONIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas
4 to 5 feet. Wave Detail: East 4 feet at 6 seconds and northwest
2 feet at 9 seconds.
.THURSDAY...East winds 10 to 15 knots with gusts up to 25 knots.
Seas around 5 feet. Wave Detail: East 4 feet at 6 seconds and
northeast 3 feet at 10 seconds.
.THURSDAY NIGHT...East winds 10 to 15 knots with gusts up to
25 knots. Seas around 5 feet. Wave Detail: East 4 feet at 6 seconds
and northeast 4 feet at 10 seconds.
.FRIDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas
around 5 feet. Wave Detail: East 4 feet at 7 seconds and northwest
3 feet at 11 seconds. Numerous showers in the morning.
.FRIDAY NIGHT...Northeast winds 10 to 15 knots, becoming east 5 to
10 knots after midnight. Seas around 5 feet. Wave Detail: East
4 feet at 7 seconds and northwest 4 feet at 11 seconds. Scattered
showers.
.SATURDAY...Southeast winds 5 to 10 knots, increasing to 10 to
15 knots in the afternoon. Seas 5 to 7 feet. Numerous showers.
.SATURDAY NIGHT...Southeast winds 10 to 15 knots. Seas 7 to 8 feet.
Scattered showers.
.SUNDAY...East winds 10 to 15 knots. Seas 7 to 8 feet. Scattered
showers.
.SUNDAY NIGHT...East winds 10 to 15 knots, increasing to 15 to
20 knots after midnight. Seas 7 to 8 feet. Scattered showers.

$$

AMZ712-201945-
Coastal Waters of Northern Puerto Rico out 10 NM-
311 AM AST Wed Aug 20 2025

.TODAY...East winds 5 to 10 knots, increasing to 10 to 15 knots this
afternoon. Gusts up to 25 knots. Seas 3 to 4 feet. Wave Detail: East
3 feet at 5 seconds and east 2 feet at 8 seconds. Isolated showers
early this morning. Scattered showers late this morning and
afternoon. Isolated thunderstorms late.
.TONIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas
around 4 feet. Wave Detail: East 4 feet at 7 seconds and northeast
2 feet at 12 seconds.
.THURSDAY...East winds 10 to 15 knots with gusts up to 25 knots.
Seas 4 to 5 feet. Wave Detail: East 4 feet at 6 seconds and
northwest 2 feet at 11 seconds.
.THURSDAY NIGHT...East winds 10 to 15 knots with gusts up to
25 knots. Seas 4 to 5 feet. Wave Detail: East 4 feet at 6 seconds
and northwest 3 feet at 11 seconds.
.FRIDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas
4 to 5 feet. Wave Detail: Northeast 3 feet at 6 seconds and
northeast 3 feet at 9 seconds. Scattered showers in the morning.
.FRIDAY NIGHT...Northeast winds 10 to 15 knots with gusts up to
20 knots, becoming east 5 to 10 knots after midnight. Seas 4 to
5 feet. Wave Detail: Northeast 3 feet at 7 seconds and northwest
3 feet at 11 seconds. Scattered showers.
.SATURDAY...Southeast winds 5 to 10 knots. Seas 4 to 6 feet.
Scattered showers in the morning, then numerous showers in the
afternoon.
.SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas 6 to 7 feet.
Scattered showers.
.SUNDAY...Southeast winds 5 to 10 knots, becoming east 10 to
15 knots in the afternoon. Seas 6 to 7 feet. Scattered showers in
the morning.
.SUNDAY NIGHT...East winds 10 to 15 knots. Seas 7 to 8 feet.
Scattered showers.

Winds and seas higher in and near thunderstorms.

$$

AMZ716-201945-
Coastal Waters from Cabo San Juan to the waters between Anegada
Island and Virgin Gorda and North 10 NM-
311 AM AST Wed Aug 20 2025

.TODAY...East winds around 15 knots with gusts up to 20 knots. Seas
3 to 4 feet. Wave Detail: East 3 feet at 4 seconds and northwest
2 feet at 10 seconds. Isolated showers.
.TONIGHT...East winds around 15 knots with gusts up to 25 knots.
Seas 3 to 4 feet. Wave Detail: East 3 feet at 5 seconds and
northwest 2 feet at 9 seconds.
.THURSDAY...East winds 10 to 15 knots with gusts up to 20 knots.
Seas 3 to 4 feet. Wave Detail: East 3 feet at 5 seconds and
northwest 2 feet at 9 seconds. Scattered showers in the afternoon.
.THURSDAY NIGHT...Northeast winds 10 to 15 knots with gusts up to
25 knots. Seas 3 to 5 feet. Wave Detail: Northeast 3 feet at
5 seconds and northwest 3 feet at 10 seconds.
.FRIDAY...Northeast winds 10 to 15 knots with gusts up to 20 knots.
Seas 4 to 5 feet. Wave Detail: Northeast 3 feet at 5 seconds and
northwest 3 feet at 11 seconds. Numerous showers.
.FRIDAY NIGHT...Northeast winds 5 to 10 knots, becoming east after
midnight. Seas 3 to 4 feet. Wave Detail: Northeast 3 feet at
5 seconds and northeast 3 feet at 8 seconds. Scattered showers.
.SATURDAY...South winds 5 to 10 knots, increasing to 10 to 15 knots
in the afternoon. Seas 3 to 5 feet. Numerous showers.
.SATURDAY NIGHT...Southeast winds 10 to 15 knots. Seas 4 to 6 feet.
Numerous showers.
.SUNDAY...East winds 15 to 20 knots. Seas 5 to 7 feet. Scattered
showers.
.SUNDAY NIGHT...East winds 10 to 15 knots. Seas 5 to 7 feet.
Scattered showers.

$$

AMZ723-201945-
Anegada Passage east of Virgin Gorda and Saint Croix south to 17N-
311 AM AST Wed Aug 20 2025

.TODAY...East winds around 15 knots with gusts up to 25 knots. Seas
around 4 feet. Wave Detail: East 4 feet at 5 seconds and northwest
1 foot at 9 seconds. Isolated showers late.
.TONIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas
4 to 5 feet. Wave Detail: East 4 feet at 6 seconds and northeast
1 foot at 12 seconds.
.THURSDAY...East winds 10 to 15 knots with gusts up to 25 knots.
Seas 4 to 5 feet. Wave Detail: East 4 feet at 6 seconds and
northeast 2 feet at 11 seconds. Scattered showers in the afternoon.
.THURSDAY NIGHT...Northeast winds around 15 knots with gusts up to
25 knots. Seas around 4 feet. Wave Detail: East 4 feet at 6 seconds
and northeast 2 feet at 10 seconds.
.FRIDAY...Northeast winds 10 to 15 knots with gusts up to 20 knots.
Seas 3 to 4 feet. Wave Detail: East 4 feet at 6 seconds and
northeast 3 feet at 9 seconds. Numerous showers in the morning.
.FRIDAY NIGHT...East winds 5 to 10 knots, becoming southeast after
midnight. Seas 3 to 4 feet. Wave Detail: Northeast 3 feet at
8 seconds and northwest 1 foot at 10 seconds. Scattered showers.
.SATURDAY...Southeast winds 10 to 15 knots. Seas 3 to 5 feet.
Scattered showers in the morning, then numerous showers in the
afternoon.
.SATURDAY NIGHT...Southeast winds 10 to 15 knots. Seas 3 to 5 feet.
Numerous showers.
.SUNDAY...East winds 15 to 20 knots. Seas 5 to 6 feet.
.SUNDAY NIGHT...East winds 10 to 15 knots. Seas 5 to 7 feet.

$$

AMZ726-201945-
Coastal waters east of Puerto Rico, around Vieques, and around and
just north of Culebra and Saint John-
311 AM AST Wed Aug 20 2025

.TODAY...East winds around 15 knots with gusts up to 25 knots. Seas
3 to 4 feet. Wave Detail: East 4 feet at 6 seconds. Isolated
showers.
.TONIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas
3 to 4 feet. Wave Detail: East 4 feet at 5 seconds.
.THURSDAY...East winds 10 to 15 knots with gusts up to 25 knots.
Seas 3 to 4 feet. Wave Detail: East 4 feet at 6 seconds. Scattered
showers in the afternoon.
.THURSDAY NIGHT...Northeast winds 10 to 15 knots with gusts up to
25 knots. Seas 3 to 4 feet. Wave Detail: East 3 feet at 6 seconds.
.FRIDAY...Northeast winds 10 to 15 knots with gusts up to 20 knots.
Seas 3 to 4 feet. Wave Detail: Northeast 3 feet at 6 seconds.
Numerous showers.
.FRIDAY NIGHT...Northeast winds 5 to 10 knots, becoming east after
midnight. Seas 2 to 4 feet. Wave Detail: Northeast 3 feet at
6 seconds. Scattered showers.
.SATURDAY...South winds 5 to 10 knots. Seas 2 to 4 feet. Numerous
showers.
.SATURDAY NIGHT...Southeast winds 10 to 15 knots. Seas 3 to 4 feet.
Numerous showers.
.SUNDAY...East winds 15 to 20 knots. Seas 4 to 6 feet. Scattered
showers.
.SUNDAY NIGHT...East winds 10 to 15 knots. Seas 4 to 6 feet.

$$

AMZ733-201945-
Caribbean waters of Puerto Rico from 10 NM to 17N, including the
coastal waters of Saint Croix-
311 AM AST Wed Aug 20 2025

.TODAY...East winds around 15 knots with gusts up to 25 knots. Seas
3 to 4 feet. Wave Detail: East 4 feet at 5 seconds and east 1 foot
at 8 seconds. Scattered showers early this morning, then isolated
showers late this morning and afternoon.
.TONIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas
around 4 feet. Wave Detail: East 4 feet at 7 seconds.
.THURSDAY...East winds around 15 knots with gusts up to 25 knots.
Seas 4 to 5 feet. Wave Detail: East 4 feet at 6 seconds.
.THURSDAY NIGHT...Northeast winds 10 to 15 knots with gusts up to
25 knots. Seas around 4 feet. Wave Detail: East 4 feet at 6 seconds.
.FRIDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas
3 to 4 feet. Wave Detail: Northeast 4 feet at 6 seconds. Numerous
showers in the morning.
.FRIDAY NIGHT...East winds 10 to 15 knots, diminishing to 5 to
10 knots after midnight. Seas around 3 feet. Wave Detail: East
3 feet at 7 seconds. Scattered showers.
.SATURDAY...Southeast winds 5 to 10 knots. Seas 3 to 4 feet.
Scattered showers.
.SATURDAY NIGHT...Southeast winds 5 to 10 knots, becoming east 10 to
15 knots after midnight. Seas 3 to 4 feet. Numerous showers.
.SUNDAY...East winds 10 to 15 knots. Seas 4 to 5 feet. Scattered
showers in the morning.
.SUNDAY NIGHT...East winds 10 to 15 knots. Seas around 5 feet.

$$

AMZ735-201945-
Coastal Waters of Southern Puerto Rico out 10 NM-
311 AM AST Wed Aug 20 2025

.TODAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas
2 to 3 feet. Wave Detail: Southeast 3 feet at 5 seconds. Scattered
showers early this morning, then isolated showers late this morning
and early afternoon.
.TONIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas
3 to 4 feet. Wave Detail: East 3 feet at 5 seconds.
.THURSDAY...East winds 10 to 15 knots with gusts up to 20 knots.
Seas 3 to 4 feet. Wave Detail: East 3 feet at 6 seconds.
.THURSDAY NIGHT...Northeast winds 10 to 15 knots with gusts up to
20 knots. Seas 3 to 4 feet. Wave Detail: East 3 feet at 6 seconds.
Scattered showers in the evening.
.FRIDAY...East winds 5 to 10 knots with gusts up to 20 knots. Seas
2 to 3 feet. Wave Detail: East 3 feet at 6 seconds. Numerous showers
in the afternoon.
.FRIDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave
Detail: East 3 feet at 6 seconds. Scattered showers.
.SATURDAY...Southeast winds 5 to 10 knots. Seas 2 to 3 feet.
Scattered showers.
.SATURDAY NIGHT...East winds 5 to 10 knots, increasing to 10 to
15 knots after midnight. Seas 2 to 3 feet. Numerous showers.
.SUNDAY...East winds 10 to 15 knots. Seas 2 to 4 feet. Scattered
showers.
.SUNDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet.

$$

AMZ741-201945-
Mona Passage Southward to 17N-
311 AM AST Wed Aug 20 2025

.TODAY...Southeast winds 10 to 15 knots with gusts up to 20 knots.
Seas 3 to 4 feet. Wave Detail: East 3 feet at 7 seconds and
northwest 1 foot at 9 seconds. Scattered showers early this morning,
then isolated showers late this morning.
.TONIGHT...East winds 10 to 15 knots, increasing to 15 to 20 knots
after midnight. Seas 3 to 4 feet. Wave Detail: East 4 feet at
6 seconds and northwest 1 foot at 9 seconds.
.THURSDAY...East winds 10 to 15 knots with gusts up to 25 knots.
Seas 4 to 5 feet. Wave Detail: Southeast 4 feet at 6 seconds and
northwest 2 feet at 11 seconds.
.THURSDAY NIGHT...East winds 10 to 15 knots with gusts up to
25 knots. Seas around 4 feet. Wave Detail: East 4 feet at 6 seconds
and northeast 2 feet at 10 seconds. Scattered showers in the
evening.
.FRIDAY...Northeast winds 10 to 15 knots with gusts up to 20 knots.
Seas around 4 feet. Wave Detail: East 4 feet at 6 seconds and
northwest 2 feet at 11 seconds.
.FRIDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots.
Seas 3 to 4 feet. Wave Detail: Northeast 3 feet at 6 seconds and
northwest 2 feet at 12 seconds.
.SATURDAY...East winds 5 to 10 knots, becoming southeast 10 to
15 knots in the afternoon. Seas 3 to 5 feet. Scattered showers in
the morning.
.SATURDAY NIGHT...Southeast winds 10 to 15 knots. Seas 4 to 6 feet.
.SUNDAY...East winds 10 to 15 knots. Seas 5 to 7 feet.
.SUNDAY NIGHT...East winds 10 to 15 knots, increasing to 15 to
20 knots after midnight. Seas 6 to 8 feet.

$$

AMZ742-201945-
Coastal Waters of Northwestern Puerto Rico out 10 NM-
311 AM AST Wed Aug 20 2025

.TODAY...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail:
South 2 feet at 5 seconds and northwest 2 feet at 10 seconds.
Isolated showers early this morning. Scattered showers this
afternoon. Isolated thunderstorms late.
.TONIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail:
South 2 feet at 5 seconds and northwest 1 foot at 9 seconds.
.THURSDAY...East winds 5 to 10 knots, becoming northeast with gusts
up to 20 knots in the afternoon. Seas 2 to 4 feet. Wave Detail:
South 2 feet at 6 seconds and northwest 2 feet at 11 seconds.
.THURSDAY NIGHT...East winds 10 to 15 knots with gusts up to
20 knots. Seas 2 to 4 feet. Wave Detail: Northeast 3 feet at
5 seconds and northeast 2 feet at 10 seconds. Scattered showers in
the evening.
.FRIDAY...Northeast winds 5 to 10 knots, increasing to 10 to
15 knots with gusts up to 20 knots in the afternoon. Seas 2 to
4 feet. Wave Detail: Northeast 3 feet at 6 seconds and northwest
2 feet at 11 seconds.
.FRIDAY NIGHT...Northeast winds 10 to 15 knots, becoming east 5 to
10 knots after midnight. Seas 3 to 4 feet. Wave Detail: Northeast
3 feet at 5 seconds and northwest 3 feet at 11 seconds.
.SATURDAY...East winds 5 to 10 knots, becoming southeast 10 to
15 knots in the afternoon. Seas 3 to 4 feet. Scattered showers in
the morning, then numerous showers in the afternoon.
.SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas 4 to 6 feet.
.SUNDAY...East winds 10 to 15 knots. Seas 5 to 7 feet. Scattered
showers in the morning.
.SUNDAY NIGHT...East winds 5 to 10 knots. Seas 5 to 7 feet.
Scattered showers.

Winds and seas higher in and near thunderstorms.

$$

AMZ745-201945-
Coastal Waters of Southwestern Puerto Rico out 10 NM-
311 AM AST Wed Aug 20 2025

.TODAY...Southeast winds 10 to 15 knots with gusts up to 20 knots.
Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 5 seconds and
northwest 1 foot at 10 seconds. Scattered showers early this
morning, then isolated showers late this morning and afternoon.
.TONIGHT...East winds 10 to 15 knots, diminishing to 5 to 10 knots
after midnight. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at
5 seconds and northwest 1 foot at 9 seconds.
.THURSDAY...East winds 5 to 10 knots, diminishing to around 5 knots
in the afternoon. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at
6 seconds and northwest 2 feet at 11 seconds.
.THURSDAY NIGHT...Northeast winds 5 to 10 knots. Seas 2 to 3 feet.
Wave Detail: Southeast 2 feet at 6 seconds and northwest 2 feet at
11 seconds. Scattered showers in the evening.
.FRIDAY...East winds around 5 knots. Seas 2 to 3 feet. Wave Detail:
Southeast 2 feet at 6 seconds and northwest 2 feet at 11 seconds.
Scattered showers in the afternoon.
.FRIDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave
Detail: North 3 feet at 4 seconds and northwest 2 feet at
12 seconds. Scattered showers.
.SATURDAY...Southeast winds 10 to 15 knots. Seas 2 to 4 feet.
Scattered showers.
.SATURDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 5 feet.
.SUNDAY...Southeast winds 10 to 15 knots. Seas 4 to 6 feet.
Scattered showers in the afternoon.
.SUNDAY NIGHT...East winds 10 to 15 knots. Seas 5 to 7 feet.

$$