National Weather Service Marine Forecast FZCA52 TJSJ

FZCA52 TJSJ 082012
CWFSJU

Coastal Waters Forecast
National Weather Service San Juan PR
412 PM AST Thu Oct 8 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.

AMZ700-090915
412 PM AST Thu Oct 8 2026

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

Weak surface high pressure over the central Atlantic continues to drift eastward, displaced by a frontal boundary moving east across the western Atlantic. This is resulting in weak pressure gradient, maintaining mainly gentle to moderate easterly trade winds. Another surface high- pressure system will build across the western Atlantic over the weekend, sustaining the easterly trade winds. An induced surface trough over the weekend could promote rounds of showers and thunderstorms across the local waters.

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AMZ711-090915
Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N
412 PM AST Thu Oct 8 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 and northeast 1 foot at 12 seconds. Scattered showers this evening. Isolated showers after midnight, then scattered showers late.

FRIDAY
East winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 6 seconds and north 1 foot at 12 seconds.

FRIDAY NIGHT
East winds around 15 knots with gusts up to 25 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 5 seconds and north 2 feet at 9 seconds. Scattered showers after midnight.

SATURDAY
East winds around 15 knots with gusts up to 25 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 5 seconds and north 2 feet at 9 seconds. Scattered showers in the afternoon.

SATURDAY NIGHT
East winds around 15 knots with gusts up to 25 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: Northeast 4 feet at 7 seconds. Scattered showers.

SUNDAY
East winds 10 to 15 knots with gusts up to 25 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: Northeast 4 feet at 7 seconds. Scattered showers in the morning.

SUNDAY NIGHT
East winds 10 to 15 knots with gusts up to 25 knots. Seas around 4 feet, occasionally to 5 feet. Scattered showers.

MONDAY
East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers in the afternoon.

MONDAY NIGHT
East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers.

TUESDAY
East winds around 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers in the morning.

TUESDAY NIGHT
East winds 10 to 15 knots. Seas 4 to 5 feet, occasionally to 6 feet.

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AMZ712-090915
Coastal Waters of Northern Puerto Rico out 10 NM
412 PM AST Thu Oct 8 2026

TONIGHT
East winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. Seas around 3 feet. Wave Detail: East 3 feet at 5 seconds and northeast 1 foot at 12 seconds. Scattered showers.

FRIDAY
East winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 5 seconds and north 1 foot at 12 seconds.

FRIDAY NIGHT
East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 5 seconds and north 1 foot at 10 seconds.

SATURDAY
East winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 3 feet at 5 seconds and north 2 feet at 8 seconds. Numerous showers in the morning.

SATURDAY 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 3 feet at 5 seconds and north 1 foot at 8 seconds. Scattered showers after midnight.

SUNDAY
East winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 4 feet at 7 seconds. Scattered 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. Scattered showers.

MONDAY
East winds 5 to 10 knots, increasing to 10 to 15 knots in the afternoon. Seas around 3 feet. Scattered showers in the afternoon.

MONDAY NIGHT
East winds 5 to 10 knots. Seas around 3 feet.

TUESDAY
East winds 5 to 10 knots, increasing to 10 to 15 knots in the afternoon. Seas 3 to 4 feet, occasionally to 5 feet.

TUESDAY NIGHT
East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers.

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AMZ716-090915
Coastal Waters from Cabo San Juan to the waters between Anegada Island and Virgin Gorda and North 10 NM
412 PM AST Thu Oct 8 2026

TONIGHT
East winds around 15 knots with gusts up to 20 knots. Seas around 3 feet. Wave Detail: East 3 feet at 5 seconds and north 1 foot at 12 seconds. Isolated showers early this evening. Isolated showers after midnight.

FRIDAY
East winds around 15 knots with gusts up to 20 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 5 seconds and north 1 foot at 12 seconds.

FRIDAY NIGHT
East winds around 15 knots with gusts up to 20 knots. Seas around 3 feet. Wave Detail: East 3 feet at 5 seconds and north 1 foot at 9 seconds. Scattered showers after midnight.

SATURDAY
East winds 10 to 15 knots with gusts up to 20 knots. Seas around 3 feet. Wave Detail: East 3 feet at 5 seconds and north 2 feet at 9 seconds. Scattered showers.

SATURDAY NIGHT
East winds around 15 knots with gusts up to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 5 seconds and north 2 feet at 8 seconds. Scattered showers.

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 3 feet at 5 seconds. Scattered showers.

SUNDAY NIGHT
East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers.

MONDAY
East winds 10 to 15 knots, diminishing to 5 to 10 knots in the afternoon. Seas 2 to 4 feet, occasionally to 5 feet. Scattered showers.

MONDAY NIGHT
East winds 5 to 10 knots. Seas 2 to 3 feet. Scattered showers.

TUESDAY
East winds around 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Scattered showers in the morning.

TUESDAY NIGHT
East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet.

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AMZ723-090915
Anegada Passage east of Virgin Gorda and Saint Croix south to 17N
412 PM AST Thu Oct 8 2026

TONIGHT
East winds around 15 knots with gusts up to 25 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 5 seconds and northeast 1 foot at 12 seconds. Isolated showers until early morning.

FRIDAY
East winds around 15 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 5 seconds and northeast 1 foot at 12 seconds.

FRIDAY NIGHT
East winds around 15 knots with gusts up to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 5 seconds and north 1 foot at 10 seconds. Scattered showers after midnight.

SATURDAY
East winds 10 to 15 knots with gusts up to 20 knots. Seas around 3 feet. Wave Detail: East 3 feet at 5 seconds and north 1 foot at 10 seconds. Scattered showers in the afternoon.

SATURDAY NIGHT
East winds around 15 knots with gusts up to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 5 seconds and north 1 foot at 9 seconds. Scattered showers.

SUNDAY
East winds 10 to 15 knots with gusts up to 20 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: Northeast 4 feet at 7 seconds. Scattered showers.

SUNDAY NIGHT
East winds 10 to 15 knots with gusts up to 20 knots. Seas around 4 feet, occasionally to 5 feet. Scattered showers.

MONDAY
East winds 10 to 15 knots, diminishing to 5 to 10 knots in the afternoon. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers.

MONDAY NIGHT
East winds 5 to 10 knots. Seas 2 to 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.

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AMZ726-090915
Coastal waters east of Puerto Rico, around Vieques, and around and just north of Culebra and Saint John
412 PM AST Thu Oct 8 2026

TONIGHT
East winds around 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 early this evening. Isolated showers late this evening and early morning, then scattered showers late.

FRIDAY
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 5 seconds. Scattered showers in the morning.

FRIDAY NIGHT
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.

SATURDAY
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.

SATURDAY NIGHT
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.

SUNDAY
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.

SUNDAY NIGHT
East winds 10 to 15 knots with gusts up to 20 knots. Seas around 3 feet. Scattered showers.

MONDAY
East winds 10 to 15 knots, diminishing to 5 to 10 knots in the afternoon. Seas around 3 feet. Scattered showers.

MONDAY NIGHT
East winds 5 to 10 knots. Seas 2 to 3 feet. Scattered showers.

TUESDAY
East winds around 10 knots. Seas 2 to 3 feet. Scattered showers in the morning.

TUESDAY NIGHT
East winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. Seas 2 to 3 feet.

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AMZ733-090915
Caribbean waters of Puerto Rico from 10 NM to 17N, including the coastal waters of Saint Croix
412 PM AST Thu Oct 8 2026

TONIGHT
East winds around 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, then isolated showers after midnight. Scattered showers late.

FRIDAY
East winds around 15 knots with gusts up to 25 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 6 seconds.

FRIDAY NIGHT
East winds around 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 after midnight.

SATURDAY
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.

SATURDAY NIGHT
East winds around 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 after midnight.

SUNDAY
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 in the afternoon.

SUNDAY NIGHT
East winds 10 to 15 knots with gusts up to 25 knots. Seas around 4 feet, occasionally to 5 feet. Scattered showers.

MONDAY
East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers.

MONDAY NIGHT
East winds around 10 knots. Seas around 3 feet. Scattered showers.

TUESDAY
East winds 10 to 15 knots. Seas around 3 feet. Scattered showers in the morning.

TUESDAY NIGHT
East winds 10 to 15 knots. Seas 2 to 3 feet. Scattered showers.

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AMZ735-090915
Coastal Waters of Southern Puerto Rico out 10 NM
412 PM AST Thu Oct 8 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 3 feet at 6 seconds. Scattered showers early this evening, then isolated showers late this evening and overnight.

FRIDAY
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.

FRIDAY 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.

SATURDAY
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 in the morning.

SATURDAY 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.

SUNDAY
East winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 6 seconds.

SUNDAY NIGHT
East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers.

MONDAY
East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet.

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.

TUESDAY NIGHT
East winds 5 to 10 knots. Seas 2 to 3 feet.

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AMZ741-090915
Mona Passage Southward to 17N
412 PM AST Thu Oct 8 2026

SMALL CRAFT SHOULD EXERCISE CAUTION

TONIGHT
East winds 10 to 15 knots, increasing to 15 to 20 knots late. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 4 feet at 6 seconds and north 1 foot at 13 seconds. Scattered showers.

FRIDAY
East winds 15 to 20 knots, diminishing to 10 to 15 knots in the afternoon. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 4 feet at 6 seconds and north 1 foot at 12 seconds. Scattered showers in the morning.

FRIDAY 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 and north 1 foot at 8 seconds.

SATURDAY
East winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 4 feet at 7 seconds.

SATURDAY NIGHT
East winds 10 to 15 knots with gusts up to 25 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 6 seconds and north 1 foot at 8 seconds. Numerous showers, mainly in the evening.

SUNDAY
East winds 15 to 20 knots with gusts up to 25 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: Northeast 4 feet at 7 seconds.

SUNDAY NIGHT
East winds 10 to 15 knots with gusts up to 25 knots. Seas around 4 feet, occasionally to 5 feet.

MONDAY
East winds 10 to 15 knots. Seas around 4 feet, occasionally to 5 feet.

MONDAY NIGHT
East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers.

TUESDAY
East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers in the morning.

TUESDAY NIGHT
East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers.

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AMZ742-090915
Coastal Waters of Northwestern Puerto Rico out 10 NM
412 PM AST Thu Oct 8 2026

TONIGHT
East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 5 seconds and northeast 1 foot at 13 seconds. Scattered showers this evening.

FRIDAY
East winds 5 to 10 knots, increasing to 10 to 15 knots with gusts up to 20 knots in the afternoon. Seas 2 to 3 feet. Wave Detail: East 2 feet at 6 seconds and north 1 foot at 12 seconds.

FRIDAY NIGHT
East winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 5 seconds and north 1 foot at 8 seconds.

SATURDAY
East winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet. Wave Detail: Northeast 3 feet at 7 seconds. Scattered showers in the afternoon.

SATURDAY NIGHT
East winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 5 seconds and north 2 feet at 8 seconds.

SUNDAY
East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: East 2 feet at 5 seconds and north 2 feet at 8 seconds. Scattered showers in the afternoon.

SUNDAY NIGHT
East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet.

MONDAY
East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. 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, becoming southeast in the afternoon. Seas 2 to 3 feet. Scattered showers in the afternoon.

TUESDAY NIGHT
East winds 5 to 10 knots, increasing to 10 to 15 knots after midnight. Seas 2 to 4 feet, occasionally to 5 feet.

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AMZ745-090915
Coastal Waters of Southwestern Puerto Rico out 10 NM
412 PM AST Thu Oct 8 2026

TONIGHT
East winds 10 to 15 knots with gusts up to 20 knots, diminishing to 5 to 10 knots with gusts up to 20 knots after midnight. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 6 seconds. Isolated showers this evening.

FRIDAY
East winds 5 to 10 knots, becoming southeast 10 to 15 knots in the afternoon. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 6 seconds and north 1 foot at 8 seconds. Scattered showers in the afternoon.

FRIDAY NIGHT
East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 6 seconds and north 1 foot at 8 seconds.

SATURDAY
East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 6 seconds and north 1 foot at 8 seconds. Numerous showers in the afternoon.

SATURDAY NIGHT
East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 6 seconds and north 1 foot at 8 seconds. Scattered showers in the evening.

SUNDAY
East winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 6 seconds and north 1 foot at 8 seconds. Scattered showers in the afternoon.

SUNDAY NIGHT
East winds 5 to 10 knots. Seas 2 to 3 feet.

MONDAY
East winds 5 to 10 knots. Seas 2 to 3 feet.

MONDAY NIGHT
East winds 5 to 10 knots. Seas 2 to 3 feet.

TUESDAY
East winds around 5 knots. Seas around 2 feet.

TUESDAY NIGHT
East winds 5 to 10 knots. Seas 2 to 3 feet.