060
FZCA52 TJSJ 182005
CWFSJU

Coastal Waters Forecast
National Weather Service San Juan PR
405 PM AST Sat Apr 18 2026

Puerto Rico and the U.S. Virgin Islands Waters

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.

AMZ700-190915-
405 PM AST Sat Apr 18 2026

.Synopsis for Puerto Rico and the U.S. Virgin Islands Waters...

An unstable weather pattern across the regional waters will persist
through Sunday. Periods of strong thunderstorms, particularly
across the western waters of Puerto Rico are expected during the
afternoon hours. A surface high pressure over the Atlantic will
promote mainly moderate to fresh easterly winds across the
offshore Atlantic waters and local Caribbean passages, resulting
in moderate to locally choppy seas through the weekend. Small
craft operators should exercise caution. A small northeasterly
swell will also continue to propagate across the Atlantic waters
and Caribbean passages through early next week.

$$

AMZ711-190915-
Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N-
405 PM AST Sat Apr 18 2026

...SMALL CRAFT SHOULD EXERCISE CAUTION...

.TONIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas
5 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at
8 seconds and northeast 2 feet at 13 seconds. Scattered showers.
Isolated thunderstorms late this evening and overnight.
.SUNDAY...East winds around 15 knots with gusts up to 25 knots. Seas
5 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at
8 seconds and northeast 2 feet at 12 seconds. Scattered showers in
the morning.
.SUNDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots.
Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet
at 8 seconds and northeast 2 feet at 12 seconds. Scattered showers.
.MONDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas
5 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at
8 seconds and northeast 2 feet at 12 seconds. Scattered showers in
the morning.
.MONDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots.
Seas around 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet
at 8 seconds and northeast 2 feet at 11 seconds. Scattered showers.
.TUESDAY...East winds 10 to 15 knots with gusts up to 20 knots,
diminishing to 5 to 10 knots in the afternoon. Seas 4 to 5 feet,
occasionally to 6 feet. Wave Detail: East 4 feet at 8 seconds and
northeast 1 foot at 11 seconds.
.TUESDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 4 feet,
occasionally to 5 feet.
.WEDNESDAY...East winds 5 to 10 knots. Seas 3 to 4 feet,
occasionally to 5 feet.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 4 to 6 feet,
occasionally to 8 feet.
.THURSDAY...East winds 10 to 15 knots. Seas 5 to 6 feet,
occasionally to 8 feet.
.THURSDAY NIGHT...East winds 10 to 15 knots. Seas around 5 feet,
occasionally to 6 feet.

Winds and seas higher in and near thunderstorms.

$$

AMZ712-190915-
Coastal Waters of Northern Puerto Rico out 10 NM-
405 PM AST Sat Apr 18 2026

.TONIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas
4 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 5 feet
at 8 seconds and northeast 2 feet at 13 seconds. Isolated
thunderstorms.
.SUNDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas
4 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 4 feet
at 8 seconds and northeast 2 feet at 12 seconds. Scattered showers.
.SUNDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots.
Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet
at 8 seconds and northeast 2 feet at 12 seconds. Numerous showers,
mainly in the evening.
.MONDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas
4 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 4 feet
at 8 seconds and northeast 2 feet at 12 seconds. Scattered showers.
.MONDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots.
Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet
at 8 seconds and northeast 2 feet at 11 seconds. Scattered showers.
.TUESDAY...East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally
to 5 feet. Wave Detail: East 4 feet at 8 seconds and northeast
2 feet at 11 seconds. Scattered showers in the morning.
.TUESDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 4 feet,
occasionally to 5 feet.
.WEDNESDAY...East winds 5 to 10 knots. Seas around 3 feet.
.WEDNESDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 5 feet,
occasionally to 6 feet.
.THURSDAY...East winds 5 to 10 knots, becoming northeast 10 to
15 knots in the afternoon. Seas 4 to 6 feet, occasionally to 8 feet.
Scattered showers in the afternoon.
.THURSDAY NIGHT...East winds 10 to 15 knots, diminishing to 5 to
10 knots after midnight. Seas around 5 feet, occasionally to 6 feet.
Scattered showers.

Winds and seas higher in and near thunderstorms.

$$

AMZ716-190915-
Coastal Waters from Cabo San Juan to the waters between Anegada
Island and Virgin Gorda and North 10 NM-
405 PM AST Sat Apr 18 2026

...SMALL CRAFT SHOULD EXERCISE CAUTION...

.TONIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas
3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at
7 seconds and northeast 1 foot at 13 seconds. Scattered showers this
evening. Isolated thunderstorms. Numerous showers after midnight.
.SUNDAY...East winds around 15 knots with gusts up to 25 knots. Seas
3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at
7 seconds and northeast 1 foot at 12 seconds. Scattered showers in
the afternoon.
.SUNDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots.
Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet
at 7 seconds and northeast 2 feet at 12 seconds. Scattered showers.
.MONDAY...East winds around 15 knots with gusts up to 25 knots. Seas
3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at
7 seconds and northeast 2 feet at 12 seconds. Scattered showers.
.MONDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots.
Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet
at 7 seconds and northeast 1 foot at 11 seconds. Scattered showers.
.TUESDAY...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally
to 5 feet. Wave Detail: East 3 feet at 8 seconds and northeast
1 foot at 11 seconds. Scattered showers in the afternoon.
.TUESDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet.
.WEDNESDAY...East winds 5 to 10 knots. Seas 2 to 3 feet. Scattered
showers in the morning.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet.
.THURSDAY...East winds 10 to 15 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Scattered showers.
.THURSDAY NIGHT...East winds around 10 knots. Seas 4 to 5 feet,
occasionally to 6 feet.

Winds and seas higher in and near thunderstorms.

$$

AMZ723-190915-
Anegada Passage east of Virgin Gorda and Saint Croix south to 17N-
405 PM AST Sat Apr 18 2026

...SMALL CRAFT SHOULD EXERCISE CAUTION...

.TONIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas
around 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at
7 seconds and northeast 1 foot at 13 seconds. Scattered showers.
Isolated thunderstorms after midnight.
.SUNDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas
around 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at
7 seconds and northeast 1 foot at 12 seconds. Scattered showers in
the morning.
.SUNDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots.
Seas around 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet
at 7 seconds and northeast 1 foot at 12 seconds. Scattered showers.
.MONDAY...East winds around 15 knots with gusts up to 25 knots. Seas
4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at
6 seconds and northeast 1 foot at 12 seconds. Scattered showers.
.MONDAY NIGHT...East winds around 15 knots with gusts up to
20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail:
East 4 feet at 7 seconds and northeast 1 foot at 11 seconds.
Scattered showers.
.TUESDAY...East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally
to 5 feet. Wave Detail: East 4 feet at 7 seconds and northeast
1 foot at 11 seconds.
.TUESDAY NIGHT...East winds around 10 knots. Seas around 3 feet.
.WEDNESDAY...East winds 5 to 10 knots. Seas 2 to 3 feet.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas around 3 feet.
.THURSDAY...East winds 10 to 15 knots. Seas around 3 feet. Scattered
showers in the morning.
.THURSDAY NIGHT...East winds around 10 knots. Seas 3 to 4 feet,
occasionally to 5 feet.

Winds and seas higher in and near thunderstorms.

$$

AMZ726-190915-
Coastal waters east of Puerto Rico, around Vieques, and around and
just north of Culebra and Saint John-
405 PM AST Sat Apr 18 2026

...SMALL CRAFT SHOULD EXERCISE CAUTION...

.TONIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas
3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at
7 seconds. Scattered showers. Isolated thunderstorms early this
evening. Isolated thunderstorms after midnight.
.SUNDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas
3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at
6 seconds. Scattered showers.
.SUNDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots.
Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet
at 7 seconds. Scattered showers.
.MONDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas
3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at
7 seconds. Scattered showers.
.MONDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots.
Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet
at 7 seconds. Scattered showers.
.TUESDAY...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail:
East 3 feet at 7 seconds. Scattered showers in the afternoon.
.TUESDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet.
.WEDNESDAY...East winds 5 to 10 knots. Seas 2 to 3 feet. Scattered
showers in the morning.
.WEDNESDAY NIGHT...East winds around 10 knots. Seas 2 to 3 feet.
.THURSDAY...East winds around 10 knots. Seas 2 to 3 feet. Scattered
showers.
.THURSDAY NIGHT...East winds around 10 knots. Seas 2 to 4 feet,
occasionally to 5 feet.

Winds and seas higher in and near thunderstorms.

$$

AMZ733-190915-
Caribbean waters of Puerto Rico from 10 NM to 17N, including the
coastal waters of Saint Croix-
405 PM AST Sat Apr 18 2026

...SMALL CRAFT SHOULD EXERCISE CAUTION...

.TONIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas
4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at
7 seconds. Isolated thunderstorms. Scattered showers until early
morning, then numerous showers late.
.SUNDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas
4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at
7 seconds. Scattered showers.
.SUNDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots.
Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet
at 7 seconds. Scattered showers.
.MONDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas
4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at
7 seconds. Scattered showers.
.MONDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots.
Seas around 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet
at 7 seconds. Scattered showers.
.TUESDAY...East winds 10 to 15 knots with gusts up to 20 knots,
diminishing to 5 to 10 knots in the afternoon. Seas 3 to 4 feet,
occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds.
Scattered showers in the morning.
.TUESDAY NIGHT...East winds 5 to 10 knots, increasing to 10 to
15 knots with gusts up to 20 knots after midnight. Seas around
3 feet.
.WEDNESDAY...East winds around 10 knots. Seas 2 to 3 feet. Scattered
showers in the morning.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet.
.THURSDAY...East winds 10 to 15 knots. Seas 2 to 3 feet.
.THURSDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet.

Winds and seas higher in and near thunderstorms.

$$

AMZ735-190915-
Coastal Waters of Southern Puerto Rico out 10 NM-
405 PM AST Sat Apr 18 2026

.TONIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas
3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at
6 seconds. Scattered showers this evening. Isolated thunderstorms
late this evening and overnight. Showers after midnight.
.SUNDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas
3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at
6 seconds. Numerous showers in the morning.
.SUNDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots.
Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet
at 6 seconds. Scattered showers.
.MONDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas
3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at
6 seconds. Scattered showers.
.MONDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots.
Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet
at 6 seconds. Scattered showers.
.TUESDAY...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail:
East 3 feet at 6 seconds.
.TUESDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet.
Scattered showers.
.WEDNESDAY...East winds 5 to 10 knots. Seas 2 to 3 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 10 knots. Seas around
2 feet.
.THURSDAY...East winds 5 to 10 knots. Seas around 2 feet.
.THURSDAY NIGHT...East winds 5 to 10 knots. Seas around 2 feet.

Winds and seas higher in and near thunderstorms.

$$

AMZ741-190915-
Mona Passage Southward to 17N-
405 PM AST Sat Apr 18 2026

...SMALL CRAFT SHOULD EXERCISE CAUTION...

.TONIGHT...East winds 10 to 15 knots, increasing to 15 to 20 knots
after midnight. Seas around 4 feet, occasionally to 5 feet. Wave
Detail: East 4 feet at 7 seconds and northeast 1 foot at 12 seconds.
Scattered showers with isolated thunderstorms.
.SUNDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas
4 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at
6 seconds and northeast 1 foot at 12 seconds. Scattered showers.
.SUNDAY NIGHT...East winds 10 to 15 knots, increasing to 15 to
20 knots after midnight. Seas 4 to 5 feet, occasionally to 6 feet.
Wave Detail: East 4 feet at 7 seconds and north 1 foot at
12 seconds. Scattered showers in the evening.
.MONDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas
4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at
6 seconds and north 1 foot at 12 seconds.
.MONDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots.
Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet
at 7 seconds and north 1 foot at 11 seconds. Scattered showers.
.TUESDAY...East winds 10 to 15 knots with gusts up to 20 knots,
diminishing to 5 to 10 knots in the afternoon. Seas 3 to 4 feet,
occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds and
northeast 1 foot at 11 seconds. Scattered showers in the morning.
.TUESDAY NIGHT...East winds 10 to 15 knots with gusts up to
20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered
showers.
.WEDNESDAY...East winds 10 to 15 knots, diminishing to 5 to 10 knots
in the afternoon. Seas 2 to 3 feet. Scattered showers in the
afternoon.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet,
occasionally to 5 feet.
.THURSDAY...East winds 5 to 10 knots. Seas 3 to 5 feet, occasionally
to 6 feet.
.THURSDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 5 feet,
occasionally to 6 feet.

Winds and seas higher in and near thunderstorms.

$$

AMZ742-190915-
Coastal Waters of Northwestern Puerto Rico out 10 NM-
405 PM AST Sat Apr 18 2026

...SMALL CRAFT SHOULD EXERCISE CAUTION...

.TONIGHT...East winds 15 to 20 knots, diminishing to 5 to 10 knots.
Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast
3 feet at 7 seconds and northeast 1 foot at 12 seconds. Numerous
showers with isolated thunderstorms early this evening, then
isolated showers late this evening and overnight.
.SUNDAY...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally
to 5 feet. Wave Detail: Northeast 3 feet at 7 seconds and northeast
1 foot at 12 seconds. Showers in the afternoon.
.SUNDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots.
Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast
3 feet at 7 seconds and northeast 2 feet at 12 seconds. Scattered
showers in the evening.
.MONDAY...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally
to 5 feet. Wave Detail: Northeast 3 feet at 6 seconds and northeast
2 feet at 12 seconds. Scattered showers in the morning, then showers
in the afternoon.
.MONDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave
Detail: Northeast 2 feet at 6 seconds and northeast 2 feet at
11 seconds. Scattered showers.
.TUESDAY...East winds 5 to 10 knots, becoming north in the
afternoon. Seas 2 to 3 feet. Wave Detail: Northeast 2 feet at
6 seconds and northeast 1 foot at 11 seconds. Scattered showers in
the afternoon.
.TUESDAY NIGHT...Northeast winds 10 to 15 knots with gusts up to
20 knots. Seas 2 to 3 feet. Scattered showers.
.WEDNESDAY...East winds around 10 knots, becoming northeast in the
afternoon. Seas 2 to 3 feet. Scattered showers in the afternoon.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 4 feet,
occasionally to 5 feet.
.THURSDAY...Northeast winds 5 to 10 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Scattered showers in the afternoon.
.THURSDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Scattered showers.

Winds and seas higher in and near thunderstorms.

$$

AMZ745-190915-
Coastal Waters of Southwestern Puerto Rico out 10 NM-
405 PM AST Sat Apr 18 2026

.TONIGHT...East winds 5 to 10 knots. Seas around 2 feet. Wave
Detail: Southeast 2 feet at 6 seconds and north 1 foot at 7 seconds.
Numerous showers with isolated thunderstorms early this evening,
then isolated showers late this evening and overnight.
.SUNDAY...East winds 5 to 10 knots. Seas around 2 feet. Wave Detail:
Southeast 2 feet at 6 seconds and north 1 foot at 7 seconds.
Scattered showers in the afternoon.
.SUNDAY NIGHT...East winds 5 to 10 knots. Seas around 2 feet. Wave
Detail: Southeast 2 feet at 6 seconds and north 1 foot at 7 seconds.
Numerous showers in the evening.
.MONDAY...East winds around 5 knots, becoming southeast in the
afternoon. Seas around 2 feet. Wave Detail: Southeast 2 feet at
6 seconds and north 1 foot at 7 seconds. Scattered showers.
.MONDAY NIGHT...East winds 5 to 10 knots. Seas around 2 feet. Wave
Detail: Southeast 2 feet at 6 seconds and north 1 foot at 7 seconds.
Numerous showers.
.TUESDAY...East winds around 5 knots, becoming southeast in the
afternoon. Seas around 2 feet. Wave Detail: Southeast 1 foot at
6 seconds and north 1 foot at 6 seconds. Scattered showers in the
afternoon.
.TUESDAY NIGHT...Northeast winds 10 to 15 knots with gusts up to
20 knots, becoming east 5 to 10 knots after midnight. Seas around
2 feet. Scattered showers.
.WEDNESDAY...East winds 5 to 10 knots, becoming south in the
afternoon. Seas around 2 feet. Scattered showers in the afternoon.
.WEDNESDAY NIGHT...East winds 5 to 10 knots. Seas around 2 feet.
.THURSDAY...Southeast winds around 5 knots. Seas 2 to 3 feet.
.THURSDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 4 feet,
occasionally to 5 feet.

Winds and seas higher in and near thunderstorms.

$$