724
FZCA52 TJSJ 182023
CWFSJU

Coastal Waters Forecast
National Weather Service San Juan PR
423 PM AST Fri Sep 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.

AMZ700-190930-
423 PM AST Fri Sep 18 2026

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

A surface high pressure extending across the Atlantic north of the
region will maintain gentle to moderate easterly winds across the
local waters through the weekend. The surface high will strengthen
northeast of the area early next week, leading to a slight increase
in winds and locally choppy seas across the offshore waters. Passing
showers will remain possible across the regional waters each day, and
afternoon thunderstorms are expected to last into the evening hours
across the western waters of Puerto Rico.

$$

AMZ711-190930-
Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N-
423 PM AST Fri Sep 18 2026

.TONIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally
to 5 feet. Wave Detail: East 3 feet at 7 seconds and north 2 feet at
8 seconds. Scattered showers.
.SATURDAY...East winds 10 to 15 knots. Seas 3 to 4 feet,
occasionally to 5 feet. Wave Detail: East 3 feet at 7 seconds and
north 2 feet at 8 seconds.
.SATURDAY NIGHT...East winds 10 to 15 knots with gusts up to
20 knots. Seas around 3 feet. Wave Detail: East 3 feet at 7 seconds
and north 2 feet at 8 seconds.
.SUNDAY...East winds around 10 knots with gusts up to 20 knots. Seas
around 3 feet. Wave Detail: East 3 feet at 7 seconds.
.SUNDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots.
Seas around 3 feet. Wave Detail: East 3 feet at 6 seconds. Scattered
showers after midnight.
.MONDAY...Southeast winds 10 to 15 knots with gusts up to 25 knots.
Seas around 3 feet. Wave Detail: East 3 feet at 6 seconds.
.MONDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots.
Seas around 3 feet.
.TUESDAY...East winds 10 to 15 knots. Seas around 3 feet.
.TUESDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet,
occasionally to 5 feet.
.WEDNESDAY...East winds 10 to 15 knots. Seas 3 to 4 feet,
occasionally to 5 feet.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet,
occasionally to 5 feet.

$$

AMZ712-190930-
Coastal Waters of Northern Puerto Rico out 10 NM-
423 PM AST Fri Sep 18 2026

.TONIGHT...East winds 10 to 15 knots with gusts up to 25 knots,
diminishing to 5 to 10 knots after midnight. Seas 3 to 4 feet,
occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds and
north 2 feet at 9 seconds. Isolated showers early this evening, then
scattered showers late this evening and overnight.
.SATURDAY...East winds 5 to 10 knots, increasing to 10 to 15 knots
with gusts up to 25 knots in the afternoon. Seas 3 to 4 feet,
occasionally to 5 feet. Wave Detail: East 3 feet at 7 seconds and
north 2 feet at 8 seconds.
.SATURDAY NIGHT...East winds 10 to 15 knots with gusts up to
20 knots, diminishing to 5 to 10 knots after midnight. Seas 3 to
4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at
7 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 around 3 feet. Wave
Detail: East 3 feet at 7 seconds and northeast 1 foot at 11 seconds.
Scattered showers in the afternoon.
.SUNDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots,
becoming southeast 5 to 10 knots after midnight. Seas around 3 feet.
Wave Detail: East 3 feet at 6 seconds. Scattered showers.
.MONDAY...East winds 5 to 10 knots, increasing to 10 to 15 knots
with gusts up to 25 knots in the afternoon. Seas around 3 feet. Wave
Detail: East 3 feet at 7 seconds.
.MONDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots,
becoming southeast 5 to 10 knots after midnight. Seas 2 to 3 feet.
.TUESDAY...East winds 10 to 15 knots. Seas 2 to 3 feet.
.TUESDAY NIGHT...East winds 10 to 15 knots, diminishing to 5 to
10 knots after midnight. Seas around 3 feet.
.WEDNESDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots
in the afternoon. Seas 3 to 4 feet, occasionally to 5 feet.
Scattered showers in the morning.
.WEDNESDAY NIGHT...East winds 10 to 15 knots, diminishing to 5 to
10 knots after midnight. Seas 3 to 4 feet, occasionally to 5 feet.

$$

AMZ716-190930-
Coastal Waters from Cabo San Juan to the waters between Anegada
Island and Virgin Gorda and North 10 NM-
423 PM AST Fri Sep 18 2026

.TONIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail:
East 2 feet at 7 seconds and north 2 feet at 9 seconds. Scattered
showers.
.SATURDAY...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail:
East 2 feet at 6 seconds and north 2 feet at 8 seconds.
.SATURDAY NIGHT...East winds around 10 knots. Seas 2 to 3 feet. Wave
Detail: East 2 feet at 6 seconds and north 2 feet at 8 seconds.
Scattered showers in the evening.
.SUNDAY...East winds around 10 knots. Seas 2 to 3 feet. Wave Detail:
East 2 feet at 5 seconds and north 2 feet at 7 seconds. Scattered
showers in the morning.
.SUNDAY NIGHT...East winds around 10 knots. Seas 2 to 3 feet. Wave
Detail: East 2 feet at 5 seconds and north 1 foot at 7 seconds.
Scattered showers after midnight.
.MONDAY...Southeast winds 10 to 15 knots. Seas 2 to 3 feet. Wave
Detail: East 2 feet at 5 seconds and north 1 foot at 7 seconds.
Scattered showers in the morning.
.MONDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots.
Seas 2 to 3 feet. Scattered showers.
.TUESDAY...East winds 10 to 15 knots. Seas 2 to 3 feet.
.TUESDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet.
.WEDNESDAY...East winds 10 to 15 knots. Seas 2 to 3 feet.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet.

$$

AMZ723-190930-
Anegada Passage east of Virgin Gorda and Saint Croix south to 17N-
423 PM AST Fri Sep 18 2026

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

$$

AMZ726-190930-
Coastal waters east of Puerto Rico, around Vieques, and around and
just north of Culebra and Saint John-
423 PM AST Fri Sep 18 2026

.TONIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet. Wave Detail:
East 3 feet at 6 seconds. Scattered showers.
.SATURDAY...East winds around 10 knots. Seas 2 to 3 feet. Wave
Detail: East 3 feet at 6 seconds. Scattered showers in the morning.
.SATURDAY NIGHT...East winds around 10 knots. Seas 2 to 3 feet. Wave
Detail: East 2 feet at 6 seconds. Scattered showers in the evening.
.SUNDAY...Southeast winds 5 to 10 knots. Seas around 2 feet. Wave
Detail: East 2 feet at 5 seconds. Scattered showers in the morning.
.SUNDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave
Detail: East 2 feet at 5 seconds. Scattered showers after midnight.
.MONDAY...Southeast winds 10 to 15 knots. Seas 2 to 3 feet. Wave
Detail: East 2 feet at 5 seconds. Scattered showers in the morning.
.MONDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots.
Seas 2 to 3 feet. Scattered showers.
.TUESDAY...East winds 10 to 15 knots. Seas 2 to 3 feet. Scattered
showers in the morning.
.TUESDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet.
.WEDNESDAY...East winds 10 to 15 knots. Seas 2 to 3 feet.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet.

$$

AMZ733-190930-
Caribbean waters of Puerto Rico from 10 NM to 17N, including the
coastal waters of Saint Croix-
423 PM AST Fri Sep 18 2026

.TONIGHT...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. Isolated showers this evening, then scattered showers
after midnight.
.SATURDAY...East winds 10 to 15 knots with gusts up to 20 knots.
Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet
at 6 seconds. Scattered 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: East 3 feet at 6 seconds.
.SUNDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas
2 to 3 feet. Wave Detail: East 3 feet at 5 seconds.
.SUNDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots.
Seas 2 to 3 feet. Wave Detail: East 3 feet at 5 seconds.
.MONDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas
around 3 feet. Wave Detail: East 3 feet at 5 seconds. Scattered
showers.
.MONDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots.
Seas around 3 feet. Scattered showers.
.TUESDAY...East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally
to 5 feet.
.TUESDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet,
occasionally to 5 feet.
.WEDNESDAY...East winds around 15 knots. Seas 3 to 4 feet,
occasionally to 5 feet.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet,
occasionally to 5 feet.

$$

AMZ735-190930-
Coastal Waters of Southern Puerto Rico out 10 NM-
423 PM AST Fri Sep 18 2026

.TONIGHT...East winds 10 to 15 knots with gusts up to 20 knots,
diminishing to 5 to 10 knots late. Seas 3 to 4 feet, occasionally to
5 feet. Wave Detail: East 3 feet at 6 seconds. Scattered showers.
.SATURDAY...East winds 5 to 10 knots, increasing to 10 to 15 knots
in the afternoon. Seas around 3 feet. Wave Detail: East 3 feet at
6 seconds.
.SATURDAY NIGHT...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.
Scattered showers after midnight.
.SUNDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas
2 to 3 feet. Wave Detail: Southeast 2 feet at 5 seconds.
.SUNDAY NIGHT...East winds 5 to 10 knots. Seas around 2 feet. Wave
Detail: Southeast 2 feet at 5 seconds. Scattered showers after
midnight.
.MONDAY...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 in the morning.
.MONDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots.
Seas 2 to 3 feet.
.TUESDAY...East winds 10 to 15 knots. Seas around 3 feet.
.TUESDAY NIGHT...East winds 10 to 15 knots, diminishing to 5 to
10 knots after midnight. Seas around 3 feet. Scattered showers.
.WEDNESDAY...East winds 10 to 15 knots. Seas around 3 feet.
.WEDNESDAY NIGHT...East winds 10 to 15 knots, diminishing to 5 to
10 knots after midnight. Seas 2 to 3 feet.

$$

AMZ741-190930-
Mona Passage Southward to 17N-
423 PM AST Fri Sep 18 2026

.TONIGHT...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 2 feet at 9 seconds. Scattered showers with
isolated thunderstorms early this evening, then isolated showers
late this evening and overnight.
.SATURDAY...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 2 feet at 8 seconds.
.SATURDAY 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 3 feet at 6 seconds. Scattered showers in the evening.
.SUNDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas
around 3 feet. Wave Detail: East 3 feet at 6 seconds.
.SUNDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots.
Seas around 3 feet. Wave Detail: East 3 feet at 6 seconds.
.MONDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots.
Seas around 3 feet. Wave Detail: Southeast 3 feet at 6 seconds.
Scattered showers in the afternoon.
.MONDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots.
Seas 3 to 4 feet, occasionally to 5 feet.
.TUESDAY...East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally
to 5 feet.
.TUESDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet,
occasionally to 5 feet.
.WEDNESDAY...East winds 10 to 15 knots. Seas 3 to 4 feet,
occasionally to 5 feet.
.WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas around 3 feet.

Winds and seas higher in and near thunderstorms.

$$

AMZ742-190930-
Coastal Waters of Northwestern Puerto Rico out 10 NM-
423 PM AST Fri Sep 18 2026

.TONIGHT...East winds 10 to 15 knots with gusts up to 20 knots,
diminishing to around 5 knots. Seas 2 to 3 feet. Wave Detail:
Southeast 2 feet at 6 seconds and north 2 feet at 9 seconds.
Scattered showers with isolated thunderstorms early this evening,
then isolated showers late this evening and overnight.
.SATURDAY...East winds around 5 knots, becoming northeast in the
afternoon. Seas 2 to 3 feet. Wave Detail: East 2 feet at 6 seconds
and north 2 feet at 8 seconds. Scattered showers in the afternoon.
.SATURDAY 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.
.SUNDAY...East winds around 5 knots. Seas 2 to 3 feet. Wave Detail:
Northeast 3 feet at 7 seconds. Scattered showers in the afternoon.
.SUNDAY NIGHT...East winds around 5 knots. Seas 2 to 3 feet. Wave
Detail: Northeast 2 feet at 7 seconds. Scattered showers in the
evening.
.MONDAY...East winds 5 to 10 knots. Seas around 2 feet. Wave Detail:
Northeast 2 feet at 7 seconds. Scattered showers in the afternoon.
.MONDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet.
.TUESDAY...East winds 5 to 10 knots. Seas 2 to 3 feet. Scattered
showers in the afternoon.
.TUESDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet.
.WEDNESDAY...Northeast winds 5 to 10 knots. Seas 2 to 3 feet.
Scattered showers in the afternoon.
.WEDNESDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet.

Winds and seas higher in and near thunderstorms.

$$

AMZ745-190930-
Coastal Waters of Southwestern Puerto Rico out 10 NM-
423 PM AST Fri Sep 18 2026

.TONIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail:
Southeast 2 feet at 6 seconds and north 1 foot at 9 seconds.
Scattered showers early this evening.
.SATURDAY...Southeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave
Detail: South 2 feet at 6 seconds and north 2 feet at 8 seconds.
.SATURDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave
Detail: Southeast 2 feet at 6 seconds and north 2 feet at 8 seconds.
Scattered showers in the evening.
.SUNDAY...Southeast winds 5 to 10 knots. Seas around 2 feet. Wave
Detail: Southeast 2 feet at 6 seconds and north 1 foot at 8 seconds.
.SUNDAY NIGHT...East winds 5 to 10 knots. Seas around 2 feet. Wave
Detail: Southeast 2 feet at 5 seconds and north 1 foot at 7 seconds.
.MONDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots.
Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 5 seconds and
north 1 foot at 7 seconds. Scattered showers in the afternoon.
.MONDAY NIGHT...East winds 5 to 10 knots, increasing to 10 to
15 knots with gusts up to 20 knots after midnight. Seas around
2 feet.
.TUESDAY...East winds 5 to 10 knots, becoming southeast 10 to
15 knots in the afternoon. Seas 2 to 3 feet.
.TUESDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet.
.WEDNESDAY...East winds 5 to 10 knots. Seas around 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 10 knots. Seas around 2 feet.

$$