National Weather Service Marine Forecast FZCA52 TJSJ
FZCA52 TJSJ 210827
CWFSJU
Coastal Waters Forecast
National Weather Service San Juan PR
427 AM AST Wed Jan 21 2026
Puerto Rico and the U.S. Virgin Islands Waters
AMZ700-212045
427 AM AST Wed Jan 21 2026
SYNOPSIS FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS WATERS
A broad surface high pressure over the central Atlantic will continue to strengthen during the next few days, tightening the local pressure gradient and promoting fresh to locally strong easterlies through much of the rest of workweek. This strong surface high pressure will maintain the frontal boundary off to the west of the northeast Caribbean. A surface trough will move across the Northeast Caribbean around Thursday, affecting Puerto Rico and the US Virgin Islands through Saturday.
AMZ711-212045
Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N
427 AM AST Wed Jan 21 2026
SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON
TODAY
East winds around 20 knots with gusts up to 30 knots. Seas
8 to 9 feet. Wave Detail: East 8 feet at 10 seconds and northwest
1 foot at 9 seconds. Isolated showers until late afternoon, then
scattered showers late.
TONIGHT
East winds 20 to 25 knots with gusts up to 30 knots. Seas
8 to 9 feet. Wave Detail: East 9 feet at 10 seconds and northwest
1 foot at 9 seconds. Scattered showers after midnight.
THURSDAY
East winds around 20 knots with gusts up to 30 knots.
Seas 8 to 9 feet. Wave Detail: East 9 feet at 10 seconds and
northwest 1 foot at 8 seconds. Scattered showers in the morning.
THURSDAY NIGHT
East winds 15 to 20 knots with gusts up to
30 knots. Seas 8 to 9 feet. Wave Detail: East 8 feet at 10 seconds
and northwest 1 foot at 8 seconds. Scattered showers.
FRIDAY
East winds 15 to 20 knots with gusts up to 25 knots. Seas
7 to 8 feet. Wave Detail: East 8 feet at 10 seconds and north 1 foot
at 8 seconds.
FRIDAY NIGHT
East winds 15 to 20 knots with gusts up to 25 knots.
Seas around 7 feet. Wave Detail: East 7 feet at 10 seconds and north
1 foot at 7 seconds. Scattered showers in the evening.
SATURDAY
East winds around 15 knots. Seas 6 to 7 feet.
SATURDAY NIGHT
East winds 15 to 20 knots. Seas 6 to 7 feet.
Scattered showers.
SUNDAY
East winds 15 to 20 knots. Seas 6 to 7 feet.
SUNDAY NIGHT
East winds around 15 knots. Seas 5 to 6 feet.
AMZ712-212045
Coastal Waters of Northern Puerto Rico out 10 NM
427 AM AST Wed Jan 21 2026
SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON
TODAY
East winds 15 to 20 knots with gusts up to 30 knots. Seas
6 to 7 feet. Wave Detail: Northeast 7 feet at 10 seconds. Scattered
showers early this morning, then isolated showers late this morning
and afternoon.
TONIGHT
East winds 15 to 20 knots with gusts up to 30 knots. Seas
7 to 8 feet. Wave Detail: Northeast 7 feet at 10 seconds and
northwest 1 foot at 9 seconds. Scattered showers after midnight.
THURSDAY
East winds 15 to 20 knots with gusts up to 30 knots.
Seas 7 to 8 feet. Wave Detail: Northeast 7 feet at 10 seconds and
northwest 1 foot at 8 seconds. Scattered showers.
THURSDAY NIGHT
East winds 15 to 20 knots, diminishing to 10 to
15 knots after midnight. Gusts up to 30 knots. Seas 6 to 7 feet.
Wave Detail: Northeast 7 feet at 10 seconds and northwest 1 foot at
8 seconds. Scattered showers.
FRIDAY
East winds 10 to 15 knots, increasing to 15 to 20 knots in
the afternoon. Seas 6 to 7 feet. Wave Detail: Northeast 6 feet at
10 seconds and north 1 foot at 8 seconds. Scattered showers in the
morning.
FRIDAY NIGHT
East winds 15 to 20 knots, diminishing to 10 to
15 knots after midnight. Seas 5 to 7 feet. Wave Detail: Northeast
6 feet at 10 seconds and north 1 foot at 7 seconds.
SATURDAY
East winds 10 to 15 knots. Seas 5 to 6 feet.
SATURDAY NIGHT
East winds 10 to 15 knots. Seas 5 to 6 feet.
SUNDAY
East winds 10 to 15 knots. Seas 5 to 6 feet.
SUNDAY NIGHT
East winds 10 to 15 knots. Seas 4 to 5 feet.
AMZ716-212045
Coastal Waters from Cabo San Juan to the waters between Anegada
Island and Virgin Gorda and North 10 NM
427 AM AST Wed Jan 21 2026
SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON
TODAY
East winds around 20 knots with gusts up to 30 knots. Seas
5 to 7 feet. Wave Detail: East 5 feet at 6 seconds and northeast
4 feet at 10 seconds. Scattered showers early this morning, then
isolated showers late this morning. Scattered showers this
afternoon.
TONIGHT
East winds 20 to 25 knots with gusts up to 30 knots. Seas
5 to 7 feet. Wave Detail: East 6 feet at 6 seconds and northeast
5 feet at 10 seconds. Scattered showers in the evening, then
numerous showers after midnight.
THURSDAY
East winds around 20 knots with gusts up to 30 knots.
Seas 5 to 7 feet. Wave Detail: East 5 feet at 6 seconds and
northeast 4 feet at 9 seconds. Scattered showers in the morning.
THURSDAY NIGHT
East winds 15 to 20 knots with gusts up to
25 knots. Seas 4 to 6 feet. Wave Detail: Northeast 5 feet at
10 seconds and east 4 feet at 5 seconds. Numerous showers.
FRIDAY
East winds 15 to 20 knots with gusts up to 25 knots. Seas
4 to 6 feet. Wave Detail: Northeast 5 feet at 10 seconds and east
3 feet at 5 seconds. Scattered showers.
FRIDAY NIGHT
East winds around 15 knots with gusts up to
25 knots. Seas 4 to 5 feet. Wave Detail: Northeast 5 feet at
10 seconds and east 3 feet at 5 seconds. Scattered showers in the
evening.
SATURDAY
East winds around 15 knots. Seas 4 to 5 feet. Scattered
showers in the morning.
SATURDAY NIGHT
East winds 15 to 20 knots. Seas 4 to 5 feet.
Scattered showers.
SUNDAY
East winds 15 to 20 knots, diminishing to 10 to 15 knots
in the afternoon. Seas 4 to 5 feet.
SUNDAY NIGHT
East winds around 15 knots. Seas 3 to 4 feet.
AMZ723-212045
Anegada Passage east of Virgin Gorda and Saint Croix south to 17N
427 AM AST Wed Jan 21 2026
SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON
TODAY
East winds around 20 knots with gusts up to 30 knots. Seas
7 to 8 feet. Wave Detail: East 8 feet at 10 seconds and east 7 feet
at 7 seconds. Isolated showers this morning, then scattered showers
this afternoon.
TONIGHT
East winds 20 to 25 knots with gusts up to 30 knots. Seas
7 to 8 feet. Wave Detail: Northeast 8 feet at 10 seconds and east
7 feet at 7 seconds. Scattered showers.
THURSDAY
East winds 20 to 25 knots, diminishing to 15 to 20 knots
in the afternoon. Seas 6 to 8 feet. Wave Detail: East 8 feet at
10 seconds and east 7 feet at 7 seconds. Numerous showers.
THURSDAY NIGHT
East winds 15 to 20 knots with gusts up to
25 knots. Seas 6 to 8 feet. Wave Detail: East 7 feet at 10 seconds.
Numerous showers, mainly in the evening.
FRIDAY
East winds 15 to 20 knots with gusts up to 25 knots. Seas
5 to 7 feet. Wave Detail: Northeast 6 feet at 10 seconds and east
4 feet at 6 seconds. Scattered showers in the morning.
FRIDAY NIGHT
East winds 15 to 20 knots with gusts up to 25 knots.
Seas 5 to 7 feet. Wave Detail: East 6 feet at 10 seconds and east
4 feet at 6 seconds. Scattered showers.
SATURDAY
East winds 15 to 20 knots. Seas 5 to 6 feet. Scattered
showers in the morning.
SATURDAY NIGHT
East winds 15 to 20 knots. Seas 5 to 6 feet.
SUNDAY
East winds 15 to 20 knots. Seas 5 to 6 feet.
SUNDAY NIGHT
East winds 15 to 20 knots. Seas 5 to 6 feet.
AMZ726-212045
Coastal waters east of Puerto Rico, around Vieques, and around and
just north of Culebra and Saint John
427 AM AST Wed Jan 21 2026
SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON
TODAY
East winds around 20 knots with gusts up to 30 knots. Seas
5 to 7 feet. Wave Detail: East 6 feet at 10 seconds and east 5 feet
at 6 seconds. Scattered showers early this morning, then isolated
showers late this morning. Scattered showers this afternoon.
TONIGHT
East winds 20 to 25 knots with gusts up to 30 knots. Seas
5 to 8 feet. Wave Detail: East 7 feet at 10 seconds and east 6 feet
at 6 seconds. Scattered showers in the evening, then numerous
showers after midnight.
THURSDAY
East winds 15 to 20 knots with gusts up to 30 knots.
Seas 5 to 7 feet. Wave Detail: East 7 feet at 10 seconds and east
5 feet at 6 seconds. Scattered showers in the morning, then numerous
showers in the afternoon.
THURSDAY NIGHT
East winds 15 to 20 knots with gusts up to
25 knots. Seas 5 to 7 feet. Wave Detail: East 6 feet at 10 seconds
and east 4 feet at 6 seconds. Numerous showers, mainly in the
evening.
FRIDAY
East winds 15 to 20 knots with gusts up to 25 knots. Seas
4 to 6 feet. Wave Detail: East 5 feet at 10 seconds and east 2 feet
at 5 seconds. Numerous showers.
FRIDAY NIGHT
East winds 15 to 20 knots with gusts up to 25 knots.
Seas 4 to 6 feet. Wave Detail: East 5 feet at 10 seconds and
southeast 2 feet at 6 seconds. Scattered showers.
SATURDAY
East winds around 15 knots. Seas 4 to 6 feet. Scattered
showers in the morning.
SATURDAY NIGHT
East winds 15 to 20 knots. Seas 4 to 6 feet.
Scattered showers.
SUNDAY
East winds 15 to 20 knots, diminishing to 10 to 15 knots
in the afternoon. Seas 4 to 6 feet.
SUNDAY NIGHT
East winds around 15 knots. Seas 3 to 5 feet.
AMZ733-212045
Caribbean waters of Puerto Rico from 10 NM to 17N, including the
coastal waters of Saint Croix
427 AM AST Wed Jan 21 2026
SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON
TODAY
East winds around 20 knots with gusts up to 30 knots. Seas
6 to 7 feet. Wave Detail: East 7 feet at 7 seconds and northeast
5 feet at 10 seconds. Scattered showers early this morning, then
isolated showers late this morning and early afternoon. Scattered
showers late.
TONIGHT
East winds around 20 knots with gusts up to 30 knots.
Seas around 7 feet. Wave Detail: East 7 feet at 8 seconds. Scattered
showers after midnight.
THURSDAY
East winds 15 to 20 knots with gusts up to 30 knots.
Seas 6 to 7 feet. Wave Detail: East 7 feet at 9 seconds. Scattered
showers in the morning, then numerous showers in the afternoon.
THURSDAY NIGHT
East winds 15 to 20 knots with gusts up to
25 knots. Seas 6 to 7 feet. Wave Detail: East 5 feet at 8 seconds
and northeast 5 feet at 10 seconds. Numerous showers, mainly in the
evening.
FRIDAY
East winds around 15 knots with gusts up to 25 knots. Seas
5 to 6 feet. Wave Detail: East 5 feet at 10 seconds and east 3 feet
at 7 seconds. Numerous showers, mainly in the morning.
FRIDAY NIGHT
East winds around 15 knots with gusts up to
25 knots. Seas around 5 feet. Wave Detail: East 5 feet at 10 seconds
and east 3 feet at 6 seconds. Scattered showers.
SATURDAY
East winds around 15 knots. Seas around 5 feet.
Scattered showers in the morning.
SATURDAY NIGHT
East winds 15 to 20 knots. Seas 5 to 6 feet.
Scattered showers.
SUNDAY
East winds 15 to 20 knots. Seas 5 to 6 feet.
SUNDAY NIGHT
East winds 15 to 20 knots. Seas around 5 feet.
AMZ735-212045
Coastal Waters of Southern Puerto Rico out 10 NM
427 AM AST Wed Jan 21 2026
SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH THURSDAY AFTERNOON
TODAY
East winds 10 to 15 knots, increasing to 15 to 20 knots
late this morning and afternoon. Gusts up to 30 knots. Seas 4 to
6 feet. Wave Detail: East 5 feet at 7 seconds. Scattered showers
early this morning, then isolated showers late this morning and
afternoon.
TONIGHT
Northeast winds 15 to 20 knots, diminishing to 10 to
15 knots after midnight. Gusts up to 30 knots. Seas 4 to 6 feet.
Wave Detail: East 5 feet at 7 seconds.
THURSDAY
East winds 15 to 20 knots with gusts up to 30 knots.
Seas 4 to 6 feet. Wave Detail: East 5 feet at 8 seconds. Numerous
showers in the afternoon.
THURSDAY NIGHT
East winds 10 to 15 knots with gusts up to
25 knots. Seas 4 to 6 feet. Wave Detail: East 5 feet at 8 seconds.
Scattered showers.
FRIDAY
East winds 10 to 15 knots with gusts up to 25 knots. Seas
3 to 5 feet. Wave Detail: East 4 feet at 7 seconds. Scattered
showers in the afternoon.
FRIDAY NIGHT
East winds 10 to 15 knots with gusts up to 25 knots.
Seas 3 to 5 feet. Wave Detail: East 4 feet at 6 seconds. Scattered
showers in the evening.
SATURDAY
East winds 10 to 15 knots. Seas 3 to 5 feet. Scattered
showers in the morning.
SATURDAY NIGHT
East winds 10 to 15 knots. Seas 3 to 5 feet.
SUNDAY
East winds 10 to 15 knots. Seas 3 to 5 feet.
SUNDAY NIGHT
East winds 10 to 15 knots. Seas 3 to 5 feet.
AMZ741-212045
Mona Passage Southward to 17N
427 AM AST Wed Jan 21 2026
SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON
TODAY
East winds 15 to 20 knots, increasing to 20 to 25 knots
this afternoon. Seas 5 to 7 feet. Wave Detail: East 6 feet at
7 seconds. Isolated showers early this morning. Scattered showers
late this morning and afternoon.
TONIGHT
East winds 20 to 25 knots, becoming northeast 15 to
20 knots after midnight. Seas 5 to 8 feet. Wave Detail: East 7 feet
at 7 seconds. Scattered showers after midnight.
THURSDAY
East winds 15 to 20 knots with gusts up to 30 knots.
Seas 5 to 7 feet. Wave Detail: East 6 feet at 8 seconds.
THURSDAY NIGHT
East winds 15 to 20 knots with gusts up to
30 knots. Seas 5 to 6 feet. Wave Detail: East 6 feet at 8 seconds
and north 1 foot at 8 seconds. Scattered showers.
FRIDAY
East winds 15 to 20 knots, diminishing to 10 to 15 knots
in the afternoon. Seas 4 to 6 feet. Wave Detail: East 5 feet at
8 seconds and north 1 foot at 8 seconds. Numerous showers, mainly in
the morning.
FRIDAY NIGHT
East winds 10 to 15 knots with gusts up to 25 knots.
Seas 4 to 5 feet. Wave Detail: East 5 feet at 7 seconds and north
1 foot at 8 seconds. Scattered showers.
SATURDAY
East winds 10 to 15 knots. Seas 4 to 5 feet. Scattered
showers in the morning.
SATURDAY NIGHT
East winds 10 to 15 knots, increasing to 15 to
20 knots after midnight. Seas 3 to 5 feet.
SUNDAY
East winds 15 to 20 knots. Seas 4 to 6 feet. Scattered
showers in the afternoon.
SUNDAY NIGHT
East winds 10 to 15 knots. Seas 4 to 5 feet.
AMZ742-212045
Coastal Waters of Northwestern Puerto Rico out 10 NM
427 AM AST Wed Jan 21 2026
SMALL CRAFT SHOULD EXERCISE CAUTION
TODAY
East winds 15 to 20 knots with gusts up to 30 knots. Seas 3
to 5 feet. Wave Detail: Northeast 4 feet at 6 seconds. Isolated
showers until late afternoon, then numerous showers late.
TONIGHT
Northeast winds 15 to 20 knots with gusts up to 30 knots.
Seas 3 to 5 feet. Wave Detail: Northeast 5 feet at 6 seconds and
northwest 1 foot at 9 seconds.
THURSDAY
East winds 15 to 20 knots, diminishing to 10 to 15 knots
in the afternoon. Seas 3 to 5 feet. Wave Detail: East 4 feet at
6 seconds and northwest 1 foot at 9 seconds. Numerous showers in the
afternoon.
THURSDAY NIGHT
East winds 15 to 20 knots, diminishing to 10 to
15 knots after midnight. Gusts up to 30 knots. Seas 3 to 5 feet.
Wave Detail: East 3 feet at 7 seconds and northwest 1 foot at
8 seconds.
FRIDAY
East winds 10 to 15 knots, diminishing to 5 to 10 knots in
the afternoon. Seas 3 to 5 feet. Wave Detail: East 3 feet at
7 seconds and north 1 foot at 8 seconds. Numerous showers in the
afternoon.
FRIDAY NIGHT
East winds 10 to 15 knots, diminishing to 5 to
10 knots after midnight. Seas 3 to 5 feet. Wave Detail: East 2 feet
at 7 seconds and north 1 foot at 8 seconds.
SATURDAY
East winds 5 to 10 knots. Seas 2 to 4 feet. Numerous
showers in the afternoon.
SATURDAY NIGHT
East winds 10 to 15 knots, diminishing to 5 to
10 knots after midnight. Seas 2 to 4 feet.
SUNDAY
East winds 5 to 10 knots. Seas 2 to 4 feet. Scattered
showers in the afternoon.
SUNDAY NIGHT
East winds 5 to 10 knots. Seas 2 to 4 feet.
AMZ745-212045
Coastal Waters of Southwestern Puerto Rico out 10 NM
427 AM AST Wed Jan 21 2026
TODAY
East winds 5 to 10 knots, increasing to 10 to 15 knots with
gusts up to 20 knots this afternoon. Seas 2 to 3 feet. Wave Detail:
East 2 feet at 6 seconds and north 1 foot at 7 seconds. Isolated
showers early this afternoon. Numerous showers late.
TONIGHT
Northeast winds 10 to 15 knots, diminishing to 5 to
10 knots after midnight. Seas 2 to 3 feet. Wave Detail: North 3 feet
at 6 seconds.
THURSDAY
East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail:
East 3 feet at 6 seconds and northwest 1 foot at 9 seconds.
Scattered showers in the afternoon.
THURSDAY NIGHT
East winds 5 to 10 knots. Seas 2 to 3 feet. Wave
Detail: East 2 feet at 6 seconds and north 1 foot at 7 seconds.
FRIDAY
East winds around 5 knots, increasing to 10 to 15 knots
with gusts up to 20 knots in the afternoon. Seas 2 to 3 feet. Wave
Detail: Southeast 2 feet at 6 seconds and north 1 foot at 7 seconds.
Scattered showers in the afternoon.
FRIDAY NIGHT
East winds 5 to 10 knots. Seas 2 to 3 feet. Wave
Detail: East 2 feet at 6 seconds and north 1 foot at 8 seconds.
SATURDAY
East winds 5 to 10 knots. Seas around 2 feet. Scattered
showers in the afternoon.
SATURDAY NIGHT
East winds 5 to 10 knots. Seas around 2 feet.
SUNDAY
East winds 5 to 10 knots. Seas around 2 feet.
SUNDAY NIGHT
East winds 10 to 15 knots, diminishing to around
5 knots after midnight. Seas 2 to 3 feet.
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