National Weather Service Marine Forecast FZCA52 TJSJ
FZCA52 TJSJ 200752
CWFSJU
Coastal Waters Forecast
National Weather Service San Juan PR
352 AM AST Mon Apr 20 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.
AMZ700-202015
352 AM AST Mon Apr 20 2026
Synopsis for Puerto Rico and the U.S. Virgin Islands Waters
A surface high positioned over the Atlantic is currently generating moderate to locally fresh easterly winds, particularly affecting the offshore Atlantic waters and the local Caribbean passages. This is resulting in moderate to choppy sea conditions. Small Craft Operators Should Exercise Caution in these aforementioned areas. Sea states are anticipated to diminish slightly around Tuesday, subsequently increasing to 6 to 7 feet from mid-week onward, owing to a northerly swell propagating across the Atlantic waters. A series of frontal lows and surface highs will result in winds veering and backing during the week, with more ENE winds by midweek and more ESE winds by the end of the workweek.
AMZ711-202015
Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N
352 AM AST Mon Apr 20 2026
SMALL CRAFT SHOULD EXERCISE CAUTION
TODAY
East winds 15 to 20 knots, diminishing to 10 to 15 knots
this afternoon. Seas 5 to 6 feet, occasionally to 8 feet. Wave
Detail: East 6 feet at 8 seconds and northeast 2 feet at 12 seconds.
Isolated showers.
TONIGHT
East winds 10 to 15 knots with gusts up to 25 knots. Seas
around 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at
8 seconds and northeast 2 feet at 11 seconds.
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
Northeast winds 5 to 10 knots. Seas 3 to 4 feet,
occasionally to 5 feet. Wave Detail: East 4 feet at 8 seconds and
northeast 1 foot at 11 seconds.
WEDNESDAY
Northeast winds 5 to 10 knots. Seas 3 to 4 feet,
occasionally to 5 feet. Wave Detail: East 3 feet at 8 seconds and
northwest 2 feet at 11 seconds.
WEDNESDAY NIGHT
Northeast winds around 10 knots. Seas 3 to
5 feet, occasionally to 6 feet, building to 5 to 6 feet,
occasionally to 8 feet after midnight. Wave Detail: North 4 feet at
10 seconds and east 3 feet at 8 seconds, becoming north 6 feet at
10 seconds and east 3 feet at 8 seconds.
THURSDAY
Northeast winds 5 to 10 knots. Seas around 6 feet,
occasionally to 8 feet.
THURSDAY NIGHT
East winds 5 to 10 knots. Seas 5 to 6 feet,
occasionally to 8 feet.
FRIDAY
East winds 5 to 10 knots. Seas around 5 feet, occasionally
to 6 feet. Scattered showers in the afternoon.
FRIDAY NIGHT
East winds 5 to 10 knots. Seas 4 to 5 feet,
occasionally to 6 feet. Scattered showers.
AMZ712-202015
Coastal Waters of Northern Puerto Rico out 10 NM
352 AM AST Mon Apr 20 2026
TODAY
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. Isolated showers
until late afternoon, then scattered showers late.
TONIGHT
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
8 seconds and northeast 2 feet at 11 seconds.
TUESDAY
East winds 10 to 15 knots. Seas around 4 feet,
occasionally to 5 feet. Wave Detail: East 4 feet at 8 seconds and
northeast 2 feet at 11 seconds.
TUESDAY NIGHT
East winds 5 to 10 knots. Seas 3 to 4 feet,
occasionally to 5 feet. Wave Detail: East 3 feet at 8 seconds and
northeast 1 foot at 11 seconds. Scattered showers after midnight.
WEDNESDAY
Northeast winds 5 to 10 knots. Seas around 3 feet. Wave
Detail: East 3 feet at 8 seconds and northeast 1 foot at 10 seconds.
WEDNESDAY NIGHT
East winds 5 to 10 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Wave Detail: North 5 feet at 10 seconds and
northeast 3 feet at 8 seconds.
THURSDAY
East winds 5 to 10 knots. Seas 5 to 6 feet, occasionally
to 8 feet.
THURSDAY NIGHT
East winds 5 to 10 knots. Seas 5 to 6 feet,
occasionally to 8 feet. Scattered showers.
FRIDAY
East winds 5 to 10 knots. Seas 4 to 5 feet, occasionally
to 6 feet. Numerous showers in the afternoon.
FRIDAY NIGHT
East winds 5 to 10 knots. Seas 4 to 5 feet,
occasionally to 6 feet.
AMZ716-202015
Coastal Waters from Cabo San Juan to the waters between Anegada
Island and Virgin Gorda and North 10 NM
352 AM AST Mon Apr 20 2026
SMALL CRAFT SHOULD EXERCISE CAUTION
TODAY
East winds 15 to 20 knots, diminishing to 10 to 15 knots
late. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East
5 feet at 6 seconds and northeast 2 feet at 12 seconds. Isolated
showers.
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 northeast 2 feet at 11 seconds.
TUESDAY
East winds 10 to 15 knots. Seas 2 to 4 feet, occasionally
to 5 feet. Wave Detail: East 4 feet at 8 seconds and northeast
1 foot at 11 seconds.
TUESDAY NIGHT
Northeast winds 5 to 10 knots. Seas 2 to 3 feet.
Wave Detail: East 3 feet at 7 seconds and northeast 1 foot at
11 seconds. Scattered showers after midnight.
WEDNESDAY
Northeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave
Detail: East 2 feet at 7 seconds and northeast 1 foot at 10 seconds.
Scattered showers in the morning.
WEDNESDAY NIGHT
Northeast winds around 10 knots. Seas 2 to
3 feet. Wave Detail: Northeast 2 feet at 7 seconds and northwest
2 feet at 11 seconds.
THURSDAY
East winds 5 to 10 knots. Seas 3 to 5 feet, occasionally
to 6 feet. Scattered showers in the morning.
THURSDAY NIGHT
East winds 5 to 10 knots. Seas 4 to 6 feet,
occasionally to 8 feet.
FRIDAY
East winds 5 to 10 knots. Seas 3 to 5 feet, occasionally
to 6 feet. Scattered showers in the afternoon.
FRIDAY NIGHT
East winds 5 to 10 knots. Seas 3 to 5 feet,
occasionally to 6 feet.
AMZ723-202015
Anegada Passage east of Virgin Gorda and Saint Croix south to 17N
352 AM AST Mon Apr 20 2026
SMALL CRAFT SHOULD EXERCISE CAUTION
TODAY
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
7 seconds and northeast 1 foot at 12 seconds. Isolated showers.
TONIGHT
East winds 10 to 15 knots with gusts up to 20 knots. Seas
4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at
7 seconds and northeast 1 foot at 11 seconds.
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
Northeast winds 10 to 15 knots with gusts up to
20 knots. Seas around 3 feet. Wave Detail: Northeast 3 feet at
7 seconds and northeast 1 foot at 11 seconds.
WEDNESDAY
Northeast winds around 10 knots. Seas 2 to 3 feet. Wave
Detail: East 3 feet at 7 seconds and northeast 1 foot at 10 seconds.
WEDNESDAY NIGHT
Northeast winds around 10 knots. Seas 2 to
3 feet. Wave Detail: Northeast 3 feet at 5 seconds and northeast
1 foot at 11 seconds.
THURSDAY
East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally
to 5 feet. Scattered showers in the morning.
THURSDAY NIGHT
East winds 5 to 10 knots. Seas 3 to 4 feet,
occasionally to 5 feet.
FRIDAY
East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally
to 5 feet.
FRIDAY NIGHT
East winds around 10 knots. Seas 3 to 4 feet,
occasionally to 5 feet.
AMZ726-202015
Coastal waters east of Puerto Rico, around Vieques, and around and
just north of Culebra and Saint John
352 AM AST Mon Apr 20 2026
SMALL CRAFT SHOULD EXERCISE CAUTION
TODAY
East winds 15 to 20 knots, diminishing to 10 to 15 knots
late. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East
5 feet at 6 seconds. Isolated showers.
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.
TUESDAY
East winds 10 to 15 knots with gusts up to 20 knots,
diminishing to 5 to 10 knots in the afternoon. Seas 2 to 4 feet,
occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds.
TUESDAY NIGHT
Northeast winds around 10 knots. Seas 2 to 3 feet.
Wave Detail: East 3 feet at 7 seconds. Scattered showers after
midnight.
WEDNESDAY
Northeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave
Detail: East 3 feet at 7 seconds. Scattered showers in the morning.
WEDNESDAY NIGHT
Northeast winds around 10 knots. Seas 2 to
3 feet. Wave Detail: Northeast 2 feet at 7 seconds.
THURSDAY
East winds 5 to 10 knots. Seas 2 to 3 feet. Scattered
showers.
THURSDAY NIGHT
East winds 5 to 10 knots. Seas 2 to 4 feet,
occasionally to 5 feet.
FRIDAY
East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally
to 5 feet. Scattered showers in the afternoon.
FRIDAY NIGHT
East winds 5 to 10 knots. Seas 2 to 3 feet.
AMZ733-202015
Caribbean waters of Puerto Rico from 10 NM to 17N, including the
coastal waters of Saint Croix
352 AM AST Mon Apr 20 2026
SMALL CRAFT SHOULD EXERCISE CAUTION
TODAY
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, mainly this morning.
TONIGHT
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
7 seconds.
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.
TUESDAY 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.
WEDNESDAY
East winds 10 to 15 knots with gusts up to 20 knots.
Seas 2 to 3 feet. Wave Detail: East 3 feet at 7 seconds. Scattered
showers in the morning.
WEDNESDAY NIGHT
Northeast winds 10 to 15 knots with gusts up to
20 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 8 seconds.
THURSDAY
East winds 5 to 10 knots. Seas 2 to 3 feet.
THURSDAY NIGHT
East winds 5 to 10 knots. Seas 2 to 3 feet.
FRIDAY
East winds 5 to 10 knots. Seas 2 to 3 feet. Scattered
showers in the afternoon.
FRIDAY NIGHT
East winds around 10 knots. Seas 2 to 3 feet.
Scattered showers.
AMZ735-202015
Coastal Waters of Southern Puerto Rico out 10 NM
352 AM AST Mon Apr 20 2026
TODAY
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 early this morning, then isolated
showers late this morning and afternoon.
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. Scattered showers after midnight.
TUESDAY
East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally
to 5 feet. Wave Detail: East 4 feet at 7 seconds.
TUESDAY NIGHT
East winds 5 to 10 knots. Seas 2 to 3 feet. Wave
Detail: East 3 feet at 7 seconds.
WEDNESDAY
East winds 5 to 10 knots. Seas 2 to 3 feet. Wave
Detail: East 2 feet at 6 seconds.
WEDNESDAY NIGHT
Northeast winds 5 to 10 knots. Seas 2 to 3 feet.
Wave Detail: East 2 feet at 6 seconds.
THURSDAY
East winds 5 to 10 knots. Seas around 2 feet. Scattered
showers in the afternoon.
THURSDAY NIGHT
East winds 5 to 10 knots. Seas around 2 feet.
FRIDAY
East winds 5 to 10 knots. Seas around 2 feet. Scattered
showers in the afternoon.
FRIDAY NIGHT
East winds 5 to 10 knots. Seas around 2 feet.
AMZ741-202015
Mona Passage Southward to 17N
352 AM AST Mon Apr 20 2026
SMALL CRAFT SHOULD EXERCISE CAUTION
TODAY
East winds 15 to 20 knots, diminishing to 10 to 15 knots
this afternoon. Seas 4 to 5 feet, occasionally to 6 feet. Wave
Detail: East 5 feet at 6 seconds and north 1 foot at 12 seconds.
Scattered showers early this morning, then isolated showers late
this morning and afternoon.
TONIGHT
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 and northeast 1 foot at 12 seconds. Scattered showers in
the evening.
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.
TUESDAY NIGHT
Northeast winds 10 to 15 knots with gusts up to
20 knots. Seas around 3 feet. Wave Detail: East 3 feet at 7 seconds
and northeast 1 foot at 11 seconds.
WEDNESDAY
East winds 5 to 10 knots. Seas around 3 feet. Wave
Detail: East 3 feet at 7 seconds and northeast 1 foot at 11 seconds.
Scattered showers in the afternoon.
WEDNESDAY NIGHT
Northeast winds 10 to 15 knots with gusts up to
20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail:
Northeast 3 feet at 6 seconds and north 3 feet at 10 seconds.
THURSDAY
East winds 10 to 15 knots, diminishing to 5 to 10 knots
in the afternoon. Seas 4 to 5 feet, occasionally to 6 feet.
THURSDAY NIGHT
East winds 5 to 10 knots. Seas 4 to 5 feet,
occasionally to 6 feet.
FRIDAY
East winds 5 to 10 knots. Seas 3 to 5 feet, occasionally
to 6 feet. Scattered showers in the afternoon.
FRIDAY NIGHT
East winds 5 to 10 knots. Seas 3 to 4 feet,
occasionally to 5 feet. Scattered showers.
AMZ742-202015
Coastal Waters of Northwestern Puerto Rico out 10 NM
352 AM AST Mon Apr 20 2026
TODAY
East winds 5 to 10 knots, diminishing to around 5 knots
early this afternoon, then becoming northeast late. 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 with
isolated thunderstorms early this afternoon. Numerous showers with
isolated thunderstorms late.
TONIGHT
East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail:
Northeast 3 feet at 6 seconds and northeast 1 foot at 11 seconds.
Scattered showers in the evening.
TUESDAY
East winds 5 to 10 knots, becoming north in the
afternoon. Seas 2 to 3 feet. Wave Detail: Northeast 2 feet at
7 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. Wave Detail: Northeast 2 feet at
6 seconds and northeast 1 foot at 11 seconds.
WEDNESDAY
East winds 5 to 10 knots, becoming northeast 10 to
15 knots with gusts up to 20 knots in the afternoon. Seas 2 to
3 feet. Wave Detail: Northeast 2 feet at 4 seconds and northeast
1 foot at 11 seconds. Scattered showers in the afternoon.
WEDNESDAY NIGHT
Northeast winds 10 to 15 knots with gusts up to
20 knots, becoming east 5 to 10 knots after midnight. Seas 2 to
4 feet, occasionally to 5 feet. Wave Detail: North 3 feet at
10 seconds and northeast 2 feet at 4 seconds.
THURSDAY
Northeast winds 5 to 10 knots. Seas 4 to 6 feet,
occasionally to 8 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.
FRIDAY
East winds around 5 knots. Seas 3 to 5 feet, occasionally
to 6 feet. Scattered showers in the afternoon.
FRIDAY NIGHT
East winds 5 to 10 knots. Seas 2 to 4 feet,
occasionally to 5 feet.
Winds and seas higher in and near thunderstorms.
AMZ745-202015
Coastal Waters of Southwestern Puerto Rico out 10 NM
352 AM AST Mon Apr 20 2026
TODAY
East winds 5 to 10 knots, becoming southeast 10 to 15 knots
with gusts up to 20 knots late this morning and early afternoon,
then becoming east 5 to 10 knots with gusts up to 20 knots late.
Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 6 seconds and
north 1 foot at 7 seconds. Isolated showers early this afternoon.
Scattered showers with isolated thunderstorms late.
TONIGHT
East winds 10 to 15 knots, diminishing to 5 to 10 knots
after midnight. Seas 2 to 3 feet. Wave Detail: East 2 feet at
6 seconds and north 1 foot at 6 seconds. Numerous showers in the
evening.
TUESDAY
East winds 5 to 10 knots, becoming southeast in the
afternoon. Seas around 2 feet. Wave Detail: Southeast 2 feet at
6 seconds. Scattered showers in the afternoon.
TUESDAY NIGHT
Northeast winds 5 to 10 knots. Seas around 2 feet.
Wave Detail: Northeast 2 feet at 6 seconds.
WEDNESDAY
East winds around 5 knots, becoming north with gusts up
to 20 knots in the afternoon. Seas around 2 feet. Wave Detail: North
1 foot at 3 seconds and southeast 1 foot at 5 seconds. Scattered
showers in the afternoon.
WEDNESDAY NIGHT
Northeast winds 5 to 10 knots. Seas around
2 feet. Wave Detail: East 2 feet at 5 seconds and northwest 2 feet
at 8 seconds.
THURSDAY
East winds 5 to 10 knots, becoming northeast in the
afternoon. Seas 2 to 4 feet, occasionally to 5 feet. Scattered
showers in the afternoon.
THURSDAY NIGHT
East winds around 5 knots. Seas 2 to 4 feet,
occasionally to 5 feet.
FRIDAY
Southeast winds 5 to 10 knots. Seas 2 to 4 feet,
occasionally to 5 feet. Scattered showers in the afternoon.
FRIDAY NIGHT
East winds 5 to 10 knots. Seas 2 to 3 feet.
Winds and seas higher in and near thunderstorms.
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