150
FZCA52 TJSJ 180747
CWFSJU

Coastal Waters Forecast
National Weather Service San Juan PR
347 AM AST Sat Oct 18 2025

Puerto Rico and the U.S. Virgin Islands Waters

AMZ700-182030-
347 AM AST Sat Oct 18 2025

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

The nearby stationary boundary will continue to promote shower and
thunderstorm activity across the regional waters and passages
through at least today. A long period northerly swell, associated to
low pressure system over the northwestern Atlantic waters, is
expected to reach the Atlantic waters and local passages today into
Sunday through the upcoming workweek. As a result, hazardous marine
conditions are anticipated. Please, continue to monitor the forecast
updates over the coming days.

$$

AMZ711-182030-
Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N-
347 AM AST Sat Oct 18 2025

.TODAY...South winds 5 to 10 knots, becoming southeast late. Seas
4 to 5 feet. Wave Detail: North 4 feet at 10 seconds and east 2 feet
at 9 seconds. Scattered showers with isolated thunderstorms.
.TONIGHT...Southeast winds 5 to 10 knots. Seas 4 to 6 feet. Wave
Detail: North 5 feet at 12 seconds and southeast 1 foot at
5 seconds. Scattered showers in the evening, then numerous showers
after midnight.
.SUNDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas
5 to 7 feet, building to 7 to 8 feet in the afternoon. Wave Detail:
North 6 feet at 12 seconds and east 1 foot at 8 seconds, becoming
north 8 feet at 14 seconds and north 3 feet at 11 seconds. Scattered
showers in the morning.
.SUNDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots.
Seas 7 to 9 feet. Wave Detail: North 8 feet at 14 seconds and east
4 feet at 5 seconds.
.MONDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas
7 to 8 feet. Wave Detail: North 7 feet at 13 seconds and east 4 feet
at 5 seconds.
.MONDAY NIGHT...East winds around 15 knots with gusts up to
25 knots. Seas 7 to 8 feet. Wave Detail: North 6 feet at 12 seconds
and east 4 feet at 6 seconds.
.TUESDAY...East winds 15 to 20 knots. Seas 6 to 7 feet.
.TUESDAY NIGHT...East winds 15 to 20 knots. Seas 6 to 7 feet.
.WEDNESDAY...East winds 15 to 20 knots. Seas 5 to 6 feet.
.WEDNESDAY NIGHT...East winds 15 to 20 knots. Seas 5 to 6 feet.

Winds and seas higher in and near thunderstorms.

$$

AMZ712-182030-
Coastal Waters of Northern Puerto Rico out 10 NM-
347 AM AST Sat Oct 18 2025

.TODAY...South winds around 5 knots, becoming east around 5 knots
late this morning, then becoming northeast early this afternoon,
becoming southeast late. Seas 4 to 5 feet. Wave Detail: North 4 feet
at 10 seconds and northeast 2 feet at 13 seconds. Scattered showers
with isolated thunderstorms early this morning, then isolated
showers late this morning. Scattered showers with isolated
thunderstorms this afternoon.
.TONIGHT...Southeast winds around 5 knots. Seas 4 to 5 feet. Wave
Detail: North 4 feet at 9 seconds and north 3 feet at 12 seconds.
Scattered showers in the evening.
.SUNDAY...Southeast winds 5 to 10 knots, becoming east 10 to
15 knots with gusts up to 20 knots in the afternoon. Seas 5 to
6 feet, building to 6 to 8 feet in the afternoon. Wave Detail: North
6 feet at 11 seconds and east 1 foot at 8 seconds, becoming north
7 feet at 11 seconds.
.SUNDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots.
Seas 7 to 9 feet.
.MONDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots in
the afternoon. Seas 7 to 8 feet. Wave Detail: North 8 feet at
13 seconds and east 4 feet at 5 seconds.
.MONDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots.
Seas 6 to 8 feet. Wave Detail: North 6 feet at 12 seconds and east
4 feet at 5 seconds.
.TUESDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots
in the afternoon. Seas 6 to 7 feet.
.TUESDAY NIGHT...East winds 10 to 15 knots. Seas 5 to 6 feet.
.WEDNESDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots
in the afternoon. Seas around 5 feet.
.WEDNESDAY NIGHT...Southeast winds 10 to 15 knots. Seas 4 to 5 feet.

Winds and seas higher in and near thunderstorms.

$$

AMZ716-182030-
Coastal Waters from Cabo San Juan to the waters between Anegada
Island and Virgin Gorda and North 10 NM-
347 AM AST Sat Oct 18 2025

.TODAY...South winds 10 to 15 knots, diminishing to 5 to 10 knots
late. Seas 4 to 5 feet. Wave Detail: Northwest 4 feet at 10 seconds
and south 2 feet at 3 seconds. Isolated thunderstorms. Numerous
showers, mainly this morning.
.TONIGHT...Southeast winds 5 to 10 knots, increasing to 10 to
15 knots with gusts up to 20 knots after midnight. Seas 3 to 5 feet.
Wave Detail: North 4 feet at 10 seconds and southeast 2 feet at
3 seconds. Numerous showers.
.SUNDAY...East winds 10 to 15 knots. Seas 4 to 6 feet. Wave Detail:
North 5 feet at 11 seconds and east 2 feet at 4 seconds. Scattered
showers in the morning.
.SUNDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots.
Seas 5 to 8 feet. Wave Detail: North 7 feet at 14 seconds and east
3 feet at 4 seconds.
.MONDAY...East winds around 15 knots with gusts up to 25 knots. Seas
5 to 8 feet. Wave Detail: North 7 feet at 13 seconds and east 4 feet
at 5 seconds.
.MONDAY NIGHT...East winds around 15 knots with gusts up to
25 knots. Seas 5 to 7 feet. Wave Detail: North 6 feet at 12 seconds
and east 4 feet at 5 seconds.
.TUESDAY...East winds 15 to 20 knots. Seas 5 to 7 feet.
.TUESDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 6 feet.
.WEDNESDAY...East winds around 15 knots. Seas 4 to 5 feet.
.WEDNESDAY NIGHT...East winds around 15 knots. Seas 4 to 5 feet.

Winds and seas higher in and near thunderstorms.

$$

AMZ723-182030-
Anegada Passage east of Virgin Gorda and Saint Croix south to 17N-
347 AM AST Sat Oct 18 2025

.TODAY...South winds 10 to 15 knots, becoming southeast 5 to
10 knots late. Seas around 4 feet. Wave Detail: South 3 feet at
6 seconds and north 2 feet at 13 seconds. Isolated thunderstorms.
.TONIGHT...Southeast winds 5 to 10 knots, becoming east 10 to
15 knots with gusts up to 20 knots after midnight. Seas 3 to 4 feet.
Wave Detail: Southeast 3 feet at 5 seconds and north 2 feet at
12 seconds.
.SUNDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas
4 to 5 feet. Wave Detail: Southeast 4 feet at 5 seconds and north
3 feet at 11 seconds.
.SUNDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots.
Seas 4 to 6 feet. Wave Detail: East 5 feet at 6 seconds and north
3 feet at 12 seconds.
.MONDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas
5 to 7 feet. Wave Detail: East 6 feet at 6 seconds and north 3 feet
at 13 seconds.
.MONDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots.
Seas 5 to 7 feet. Wave Detail: East 5 feet at 7 seconds and north
4 feet at 13 seconds.
.TUESDAY...East winds 15 to 20 knots. Seas 5 to 6 feet.
.TUESDAY NIGHT...East winds 15 to 20 knots. Seas 5 to 6 feet.
.WEDNESDAY...East winds around 15 knots. Seas around 5 feet.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 4 to 5 feet.

Winds and seas higher in and near thunderstorms.

$$

AMZ726-182030-
Coastal waters east of Puerto Rico, around Vieques, and around and
just north of Culebra and Saint John-
347 AM AST Sat Oct 18 2025

.TODAY...South winds 5 to 10 knots. Seas 3 to 4 feet. Wave Detail:
Southeast 2 feet at 6 seconds and southwest 1 foot at 3 seconds.
Numerous showers this morning. Isolated thunderstorms. Scattered
showers this afternoon.
.TONIGHT...Southeast winds 5 to 10 knots, becoming east 10 to
15 knots with gusts up to 20 knots after midnight. Seas 2 to 4 feet.
Wave Detail: Southeast 2 feet at 7 seconds. Scattered showers.
.SUNDAY...East winds 10 to 15 knots. Seas 3 to 4 feet. Wave Detail:
Southeast 3 feet at 4 seconds. Scattered showers in the morning.
.SUNDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots.
Seas 4 to 6 feet. Wave Detail: East 4 feet at 5 seconds.
.MONDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas
5 to 7 feet. Wave Detail: East 5 feet at 6 seconds. Scattered
showers in the morning.
.MONDAY NIGHT...East winds around 15 knots with gusts up to
25 knots. Seas 4 to 6 feet. Wave Detail: East 5 feet at 6 seconds.
.TUESDAY...East winds 15 to 20 knots. Seas 4 to 6 feet.
.TUESDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 5 feet.
.WEDNESDAY...East winds around 15 knots. Seas 4 to 5 feet.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 5 feet.

Winds and seas higher in and near thunderstorms.

$$

AMZ733-182030-
Caribbean waters of Puerto Rico from 10 NM to 17N, including the
coastal waters of Saint Croix-
347 AM AST Sat Oct 18 2025

.TODAY...Southeast winds 5 to 10 knots. Seas around 3 feet. Wave
Detail: Southeast 2 feet at 6 seconds and west 1 foot at 4 seconds.
Scattered showers with isolated thunderstorms this morning, then
isolated showers early this afternoon. Scattered showers with
isolated thunderstorms late.
.TONIGHT...Southeast winds 5 to 10 knots, becoming east 10 to
15 knots with gusts up to 20 knots after midnight. Seas 2 to 3 feet.
Wave Detail: Southeast 2 feet at 6 seconds and east 1 foot at
9 seconds.
.SUNDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas
3 to 4 feet. Wave Detail: Southeast 3 feet at 6 seconds.
.SUNDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots.
Seas 3 to 5 feet. Wave Detail: East 4 feet at 6 seconds.
.MONDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas
4 to 6 feet. Wave Detail: East 6 feet at 7 seconds and northwest
1 foot at 11 seconds.
.MONDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots.
Seas 5 to 6 feet. Wave Detail: East 6 feet at 7 seconds and
northwest 1 foot at 13 seconds. Scattered showers.
.TUESDAY...East winds 15 to 20 knots. Seas 5 to 6 feet.
.TUESDAY NIGHT...East winds 15 to 20 knots. Seas 5 to 6 feet.
.WEDNESDAY...East winds 15 to 20 knots. Seas 4 to 5 feet.
.WEDNESDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 5 feet.

Winds and seas higher in and near thunderstorms.

$$

AMZ735-182030-
Coastal Waters of Southern Puerto Rico out 10 NM-
347 AM AST Sat Oct 18 2025

.TODAY...Southeast winds around 5 knots. Seas 2 to 3 feet. Wave
Detail: Southeast 2 feet at 6 seconds and west 1 foot at 4 seconds.
Scattered showers with isolated thunderstorms this morning, then
isolated showers early this afternoon. Scattered showers late.
.TONIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail:
Southeast 2 feet at 6 seconds. Scattered showers.
.SUNDAY...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. Scattered
showers in the morning.
.SUNDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots.
Seas around 3 feet. Wave Detail: Southeast 3 feet at 6 seconds.
.MONDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas
3 to 5 feet. Wave Detail: Southeast 5 feet at 6 seconds.
.MONDAY NIGHT...East winds 15 to 20 knots, diminishing to 10 to
15 knots after midnight. Seas 4 to 5 feet. Wave Detail: East 5 feet
at 7 seconds.
.TUESDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots
in the afternoon. Seas 4 to 5 feet.
.TUESDAY NIGHT...East winds 15 to 20 knots, diminishing to 10 to
15 knots after midnight. Seas 4 to 5 feet.
.WEDNESDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots
in the afternoon. Seas 4 to 5 feet.
.WEDNESDAY NIGHT...East winds 10 to 15 knots, increasing to 15 to
20 knots after midnight. Seas 3 to 5 feet.

Winds and seas higher in and near thunderstorms.

$$

AMZ741-182030-
Mona Passage Southward to 17N-
347 AM AST Sat Oct 18 2025

.TODAY...Southeast winds around 5 knots, increasing to 5 to 10 knots
late this morning and afternoon. Seas 4 to 5 feet. Wave Detail:
North 3 feet at 10 seconds and southeast 2 feet at 6 seconds.
Scattered showers with isolated thunderstorms.
.TONIGHT...Southeast winds 5 to 10 knots, becoming east 10 to
15 knots with gusts up to 20 knots after midnight. Seas 3 to 4 feet.
Wave Detail: North 3 feet at 9 seconds and north 3 feet at
12 seconds. Scattered showers after midnight.
.SUNDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas
4 to 5 feet. Wave Detail: North 5 feet at 11 seconds and southeast
3 feet at 6 seconds. Scattered showers in the morning.
.SUNDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots.
Seas 5 to 7 feet. Wave Detail: North 6 feet at 14 seconds and
southeast 4 feet at 6 seconds.
.MONDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas
6 to 8 feet. Wave Detail: Southeast 6 feet at 6 seconds and north
6 feet at 14 seconds.
.MONDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots.
Seas 6 to 8 feet. Wave Detail: Southeast 6 feet at 7 seconds and
north 6 feet at 13 seconds. Scattered showers.
.TUESDAY...East winds 15 to 20 knots. Seas 6 to 7 feet.
.TUESDAY NIGHT...East winds 15 to 20 knots. Seas 6 to 7 feet.
Scattered showers.
.WEDNESDAY...East winds 15 to 20 knots. Seas 5 to 7 feet. Scattered
showers.
.WEDNESDAY NIGHT...East winds 15 to 20 knots, increasing to 20 to
25 knots after midnight. Seas 5 to 6 feet. Scattered showers.

Winds and seas higher in and near thunderstorms.

$$

AMZ742-182030-
Coastal Waters of Northwestern Puerto Rico out 10 NM-
347 AM AST Sat Oct 18 2025

.TODAY...South winds 5 to 10 knots. Seas 3 to 5 feet. Wave Detail:
North 3 feet at 11 seconds and northeast 2 feet at 14 seconds.
Scattered showers. Isolated thunderstorms early this morning.
Isolated thunderstorms this afternoon.
.TONIGHT...East winds 5 to 10 knots. Seas 2 to 4 feet. Wave Detail:
North 3 feet at 11 seconds. Scattered showers in the evening.
.SUNDAY...East winds around 5 knots, becoming northeast in the
afternoon. Seas 3 to 5 feet.
.SUNDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots,
diminishing to 5 to 10 knots after midnight. Seas 4 to 6 feet. Wave
Detail: Northwest 3 feet at 11 seconds.
.MONDAY...East winds 5 to 10 knots. Seas 5 to 7 feet. Wave Detail:
Northwest 3 feet at 14 seconds. Numerous showers in the afternoon.
.MONDAY NIGHT...East winds 5 to 10 knots. Seas 4 to 6 feet. Wave
Detail: North 6 feet at 12 seconds and northeast 3 feet at
6 seconds.
.TUESDAY...East winds 5 to 10 knots. Seas 4 to 6 feet. Scattered
showers in the afternoon.
.TUESDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 5 feet.
.WEDNESDAY...East winds 5 to 10 knots. Seas 3 to 5 feet. Scattered
showers in the afternoon.
.WEDNESDAY NIGHT...East winds 10 to 15 knots, increasing to 15 to
20 knots after midnight. Seas 3 to 5 feet.

Winds and seas higher in and near thunderstorms.

$$

AMZ745-182030-
Coastal Waters of Southwestern Puerto Rico out 10 NM-
347 AM AST Sat Oct 18 2025

.TODAY...Southeast winds 5 to 10 knots. Seas 3 to 4 feet. Wave
Detail: Northwest 3 feet at 11 seconds and southwest 1 foot at
4 seconds. Isolated thunderstorms early this morning. Scattered
showers this morning, then isolated showers this afternoon.
.TONIGHT...East winds 5 to 10 knots. Seas 2 to 4 feet. Wave Detail:
Northwest 3 feet at 10 seconds and southeast 1 foot at 5 seconds.
Scattered showers after midnight.
.SUNDAY...East 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: Northwest 3 feet at 11 seconds and southeast 2 feet at
6 seconds.
.SUNDAY NIGHT...East winds 5 to 10 knots. Seas 4 to 6 feet. Wave
Detail: Northwest 5 feet at 15 seconds and southeast 2 feet at
5 seconds.
.MONDAY...East winds 5 to 10 knots, increasing to 10 to 15 knots
with gusts up to 25 knots in the afternoon. Seas 5 to 7 feet. Wave
Detail: Northwest 5 feet at 15 seconds and southeast 3 feet at
6 seconds. Scattered showers in the afternoon.
.MONDAY NIGHT...East winds 10 to 15 knots, diminishing to 5 to
10 knots after midnight. Gusts up to 25 knots. Seas 4 to 6 feet.
Wave Detail: Northwest 5 feet at 13 seconds and southeast 3 feet at
6 seconds.
.TUESDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots
in the afternoon. Seas 4 to 6 feet.
.TUESDAY NIGHT...East winds 15 to 20 knots, diminishing to 10 to
15 knots after midnight. Seas 3 to 5 feet.
.WEDNESDAY...East winds 10 to 15 knots, becoming southeast 15 to
20 knots in the afternoon. Seas 3 to 5 feet.
.WEDNESDAY NIGHT...East winds 15 to 20 knots. Seas 3 to 5 feet.

Winds and seas higher in and near thunderstorms.

$$