120
FZCA52 TJSJ 210705
CWFSJU

Coastal Waters Forecast
National Weather Service San Juan PR
305 AM AST Thu Aug 21 2025

Puerto Rico and the U.S. Virgin Islands Waters

AMZ700-212015-
305 AM AST Thu Aug 21 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
night and into the weekend, resulting in hazardous seas for the
Atlantic waters and passages.

$$

AMZ711-212015-
Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N-
305 AM AST Thu Aug 21 2025

...SMALL CRAFT SHOULD EXERCISE CAUTION...

.TODAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas
5 to 6 feet. Wave Detail: East 4 feet at 6 seconds and northeast
2 feet at 10 seconds. Isolated showers until late afternoon.
.TONIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas
5 to 6 feet. Wave Detail: East 4 feet at 7 seconds and northwest
3 feet at 10 seconds.
.FRIDAY...Northeast 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. Scattered showers in the morning.
.FRIDAY NIGHT...Northeast 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 4 feet at 12 seconds. Scattered showers.
.SATURDAY...Southeast winds 5 to 10 knots. Seas 5 to 6 feet. Wave
Detail: Northwest 6 feet at 15 seconds and east 4 feet at 8 seconds.
Scattered showers in the morning.
.SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas 6 to 7 feet.
Wave Detail: North 6 feet at 14 seconds and east 3 feet at
8 seconds. Scattered showers.
.SUNDAY...East winds 10 to 15 knots. Seas 7 to 8 feet.
.SUNDAY NIGHT...East winds 10 to 15 knots. Seas 7 to 8 feet.
.MONDAY...East winds 10 to 15 knots. Seas 7 to 8 feet.
.MONDAY NIGHT...East winds 15 to 20 knots. Seas 6 to 7 feet.

$$

AMZ712-212015-
Coastal Waters of Northern Puerto Rico out 10 NM-
305 AM AST Thu Aug 21 2025

.TODAY...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 10 seconds. Isolated showers until late afternoon.
.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
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 6 seconds and
northwest 3 feet at 10 seconds. Scattered showers in the morning.
.FRIDAY NIGHT...East winds 5 to 10 knots. Seas 4 to 5 feet. Wave
Detail: Northwest 4 feet at 12 seconds and northeast 3 feet at
7 seconds. Scattered showers in the evening.
.SATURDAY...East winds 5 to 10 knots. Seas 4 to 6 feet. Wave Detail:
North 6 feet at 14 seconds and northeast 3 feet at 7 seconds.
Scattered showers in the afternoon.
.SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas 5 to 7 feet.
Wave Detail: North 6 feet at 14 seconds and northeast 3 feet at
8 seconds. Numerous showers.
.SUNDAY...Southeast winds 5 to 10 knots, becoming east 10 to
15 knots in the afternoon. Seas 6 to 7 feet. Numerous showers in the
afternoon.
.SUNDAY NIGHT...East winds 10 to 15 knots. Seas 6 to 8 feet.
.MONDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots in
the afternoon. Seas 6 to 7 feet. Scattered showers in the morning.
.MONDAY NIGHT...East winds 10 to 15 knots. Seas 6 to 7 feet.

$$

AMZ716-212015-
Coastal Waters from Cabo San Juan to the waters between Anegada
Island and Virgin Gorda and North 10 NM-
305 AM AST Thu Aug 21 2025

.TODAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas
3 to 5 feet. Wave Detail: East 4 feet at 5 seconds and northeast
2 feet at 11 seconds. Isolated showers until late afternoon.
.TONIGHT...Northeast winds 10 to 15 knots with gusts up to 20 knots.
Seas 3 to 5 feet. Wave Detail: Northeast 3 feet at 5 seconds and
north 2 feet at 10 seconds.
.FRIDAY...Northeast winds 10 to 15 knots with gusts up to 20 knots.
Seas 3 to 5 feet. Wave Detail: Northeast 3 feet at 5 seconds and
northwest 3 feet at 10 seconds. Numerous showers.
.FRIDAY NIGHT...East winds 5 to 10 knots. Seas 3 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 3 to 4 feet. Wave
Detail: Northeast 3 feet at 7 seconds and northwest 3 feet at
11 seconds. Scattered showers in the morning.
.SATURDAY NIGHT...Southeast winds around 10 knots. Seas 4 to 6 feet.
Wave Detail: Northwest 5 feet at 15 seconds and east 3 feet at
8 seconds.
.SUNDAY...East winds 10 to 15 knots. Seas 5 to 7 feet. Scattered
showers in the afternoon.
.SUNDAY NIGHT...East winds around 15 knots. Seas 5 to 7 feet.
.MONDAY...East winds around 15 knots. Seas 5 to 7 feet. Scattered
showers in the morning.
.MONDAY NIGHT...East winds around 15 knots. Seas 5 to 7 feet.
Scattered showers.

$$

AMZ723-212015-
Anegada Passage east of Virgin Gorda and Saint Croix south to 17N-
305 AM AST Thu Aug 21 2025

.TODAY...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 north
1 foot at 11 seconds. Isolated showers until late afternoon.
.TONIGHT...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 north
1 foot at 10 seconds. Scattered showers after midnight.
.FRIDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas
3 to 4 feet. Wave Detail: Northeast 3 feet at 5 seconds and north
1 foot at 10 seconds. Numerous showers in the morning.
.FRIDAY NIGHT...Southeast winds 5 to 10 knots. Seas 2 to 4 feet.
Wave Detail: Northeast 3 feet at 7 seconds. Scattered showers.
.SATURDAY...Southeast winds 5 to 10 knots. Seas 3 to 4 feet. Wave
Detail: Southeast 3 feet at 8 seconds and northwest 1 foot at
10 seconds. Numerous showers in the morning.
.SATURDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet. Wave
Detail: Southeast 3 feet at 6 seconds and northwest 1 foot at
10 seconds.
.SUNDAY...East winds 10 to 15 knots. Seas 4 to 6 feet.
.SUNDAY NIGHT...East winds 15 to 20 knots. Seas 5 to 7 feet.
.MONDAY...East winds 15 to 20 knots. Seas 5 to 7 feet.
.MONDAY NIGHT...East winds 15 to 20 knots. Seas 5 to 7 feet.

$$

AMZ726-212015-
Coastal waters east of Puerto Rico, around Vieques, and around and
just north of Culebra and Saint John-
305 AM AST Thu Aug 21 2025

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

$$

AMZ733-212015-
Caribbean waters of Puerto Rico from 10 NM to 17N, including the
coastal waters of Saint Croix-
305 AM AST Thu Aug 21 2025

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

$$

AMZ735-212015-
Coastal Waters of Southern Puerto Rico out 10 NM-
305 AM AST Thu Aug 21 2025

.TODAY...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. Isolated
showers.
.TONIGHT...East 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...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail:
East 3 feet at 6 seconds. Scattered 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 around 2 feet. Wave
Detail: East 2 feet at 6 seconds. Numerous showers in the morning.
.SATURDAY NIGHT...East winds 5 to 10 knots. Seas around 2 feet. Wave
Detail: East 2 feet at 6 seconds.
.SUNDAY...East winds 10 to 15 knots. Seas 2 to 3 feet.
.SUNDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet.
.MONDAY...East winds 10 to 15 knots. Seas 3 to 5 feet. Scattered
showers.
.MONDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet.
Scattered showers.

$$

AMZ741-212015-
Mona Passage Southward to 17N-
305 AM AST Thu Aug 21 2025

.TODAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas
4 to 5 feet. Wave Detail: East 4 feet at 6 seconds and northeast
2 feet at 11 seconds. Isolated showers this afternoon.
.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 northeast
2 feet at 10 seconds.
.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...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 and north 3 feet at 12 seconds.
.SATURDAY...East winds 10 to 15 knots with gusts up to 20 knots,
becoming southeast 5 to 10 knots in the afternoon. Seas 3 to 4 feet.
Wave Detail: North 4 feet at 14 seconds and east 3 feet at
6 seconds. Scattered showers in the afternoon.
.SATURDAY NIGHT...East winds 10 to 15 knots with gusts up to
20 knots. Seas 4 to 6 feet. Wave Detail: North 5 feet at 15 seconds
and east 3 feet at 6 seconds.
.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 7 feet.
.MONDAY...East winds 10 to 15 knots. Seas 6 to 7 feet.
.MONDAY NIGHT...East winds 15 to 20 knots. Seas 6 to 7 feet.

$$

AMZ742-212015-
Coastal Waters of Northwestern Puerto Rico out 10 NM-
305 AM AST Thu Aug 21 2025

.TODAY...East winds 5 to 10 knots, becoming northeast with gusts up
to 20 knots late. Seas 2 to 4 feet. Wave Detail: East 2 feet at
6 seconds and northeast 2 feet at 11 seconds. Scattered showers
early this afternoon. Isolated showers late.
.TONIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas
3 to 5 feet. Wave Detail: Northeast 3 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: Northeast 3 feet at 5 seconds and
northwest 3 feet at 11 seconds.
.FRIDAY NIGHT...Northeast winds 10 to 15 knots with gusts up to
20 knots. 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 in the
afternoon. Seas 3 to 4 feet. Wave Detail: Northwest 4 feet at
12 seconds and northeast 3 feet at 5 seconds. Numerous showers in
the afternoon.
.SATURDAY NIGHT...East winds 5 to 10 knots. Seas 4 to 6 feet. Wave
Detail: North 6 feet at 15 seconds and northeast 2 feet at
5 seconds. Numerous showers.
.SUNDAY...East winds 5 to 10 knots. Seas 5 to 7 feet. Scattered
showers in the morning, then numerous showers in the afternoon.
.SUNDAY NIGHT...East winds 5 to 10 knots. Seas 5 to 7 feet.
Scattered showers.
.MONDAY...East winds 5 to 10 knots. Seas 5 to 7 feet. Scattered
showers in the afternoon.
.MONDAY NIGHT...East winds 10 to 15 knots. Seas 4 to 6 feet.

$$

AMZ745-212015-
Coastal Waters of Southwestern Puerto Rico out 10 NM-
305 AM AST Thu Aug 21 2025

.TODAY...East winds 5 to 10 knots, becoming southeast early this
afternoon, then becoming east late. Seas 2 to 3 feet. Wave Detail:
Southeast 2 feet at 5 seconds and northwest 1 foot at 10 seconds.
Scattered showers early this afternoon. Isolated showers late.
.TONIGHT...East winds around 5 knots, increasing to 5 to 10 knots
after midnight. Seas 2 to 3 feet. Wave Detail: South 2 feet at
6 seconds and northwest 2 feet at 11 seconds.
.FRIDAY...East winds 5 to 10 knots, becoming west in the afternoon.
Seas 2 to 3 feet. Wave Detail: East 2 feet at 5 seconds and
northwest 2 feet at 10 seconds.
.FRIDAY NIGHT...Northeast winds 5 to 10 knots. Seas 2 to 3 feet.
Wave Detail: Southeast 2 feet at 5 seconds and northwest 2 feet at
11 seconds. Scattered showers in the evening.
.SATURDAY...Southeast winds 5 to 10 knots. Seas around 3 feet. Wave
Detail: Northwest 3 feet at 12 seconds and northwest 2 feet at
5 seconds. Numerous showers in the afternoon.
.SATURDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 5 feet. Wave
Detail: Northwest 5 feet at 12 seconds and south 2 feet at
4 seconds.
.SUNDAY...East winds 5 to 10 knots, becoming southeast 10 to
15 knots in the afternoon. Seas 4 to 6 feet.
.SUNDAY NIGHT...East winds 10 to 15 knots. Seas 5 to 7 feet.
.MONDAY...East winds 5 to 10 knots, becoming southeast 10 to
15 knots in the afternoon. Seas 5 to 7 feet. Scattered showers in
the afternoon.
.MONDAY NIGHT...East winds 10 to 15 knots, diminishing to 5 to
10 knots after midnight. Seas 4 to 6 feet.

$$