Coastal Waters Forecast
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
625 FZCA52 TJSJ 222036 CWFSJU Coastal Waters Forecast National Weather Service San Juan PR 436 PM AST Fri Aug 22 2025 Puerto Rico and the U.S. Virgin Islands Waters AMZ700-230915- 436 PM AST Fri Aug 22 2025 .SYNOPSIS FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS WATERS... A strong tropical wave, moving near the northeast Caribbean will promote a northeasterly wind flow tonight, becoming more east- southeast to southeast Saturday and Sunday. The chance to observe showers and thunderstorms across the islands late tonight into Saturday will increase, drying rapidly late Saturday evening into Sunday. A long period northerly swell from distant Hurricane Erin will spread across the islands from now onward, resulting in hazardous seas for the Atlantic waters and Caribbean passages through early next week. $$ AMZ711-230915- Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N- 436 PM AST Fri Aug 22 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON... .TONIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 5 to 6 feet. Wave Detail: East 4 feet at 7 seconds and northwest 3 feet at 11 seconds. Numerous showers, mainly this evening. .SATURDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 5 to 7 feet. Wave Detail: East 4 feet at 8 seconds and northwest 4 feet at 14 seconds. Scattered showers. .SATURDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 6 to 7 feet. Wave Detail: North 7 feet at 13 seconds and east 4 feet at 8 seconds. Scattered showers. .SUNDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Seas 7 to 8 feet. Wave Detail: North 8 feet at 13 seconds and east 4 feet at 8 seconds. .SUNDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 7 to 8 feet. Wave Detail: East 8 feet at 10 seconds and north 8 feet at 13 seconds. .MONDAY...East winds around 15 knots with gusts up to 25 knots. Seas 7 to 8 feet. Wave Detail: East 8 feet at 11 seconds. .MONDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 7 to 8 feet. .TUESDAY...East winds 15 to 20 knots. Seas 7 to 8 feet. .TUESDAY NIGHT...East winds 10 to 15 knots. Seas 6 to 7 feet. .WEDNESDAY...East winds 10 to 15 knots. Seas 5 to 6 feet. Scattered showers. .WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 4 to 5 feet. Scattered showers. $$ AMZ712-230915- Coastal Waters of Northern Puerto Rico out 10 NM- 436 PM AST Fri Aug 22 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM SATURDAY EVENING THROUGH MONDAY AFTERNOON... .TONIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas around 5 feet. Wave Detail: Northeast 3 feet at 6 seconds and northwest 3 feet at 11 seconds. Numerous showers this evening, then scattered showers with isolated thunderstorms after midnight. .SATURDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 5 to 6 feet. Wave Detail: Northeast 4 feet at 7 seconds and north 4 feet at 12 seconds. Scattered showers in the morning, then numerous showers in the afternoon. .SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas 5 to 7 feet. Wave Detail: North 7 feet at 13 seconds and northeast 4 feet at 8 seconds. Scattered showers. .SUNDAY...East winds 10 to 15 knots with gusts up to 20 knots, increasing to 15 to 20 knots with gusts up to 30 knots in the afternoon. Seas 6 to 8 feet. Wave Detail: North 8 feet at 13 seconds and east 5 feet at 8 seconds. .SUNDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots, diminishing to 10 to 15 knots with gusts up to 20 knots after midnight. Seas 6 to 8 feet. Wave Detail: North 8 feet at 13 seconds and northeast 7 feet at 10 seconds. .MONDAY...East winds 10 to 15 knots with gusts up to 20 knots, increasing to 15 to 20 knots with gusts up to 30 knots in the afternoon. Seas 6 to 7 feet. Wave Detail: Northeast 7 feet at 11 seconds. .MONDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas around 7 feet. .TUESDAY...East winds 15 to 20 knots. Seas 6 to 7 feet. .TUESDAY NIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 6 to 7 feet. .WEDNESDAY...East winds 10 to 15 knots. Seas 5 to 6 feet. Scattered showers. .WEDNESDAY NIGHT...East winds 10 to 15 knots, becoming southeast 5 to 10 knots after midnight. Seas 4 to 5 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ716-230915- Coastal Waters from Cabo San Juan to the waters between Anegada Island and Virgin Gorda and North 10 NM- 436 PM AST Fri Aug 22 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY AFTERNOON THROUGH MONDAY AFTERNOON... .TONIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Wave Detail: East 4 feet at 6 seconds and northwest 3 feet at 11 seconds. Numerous showers until early morning. Isolated thunderstorms after midnight, then scattered showers late. .SATURDAY...Southeast winds 5 to 10 knots. Seas 3 to 5 feet. Wave Detail: East 3 feet at 7 seconds and northwest 3 feet at 10 seconds. Scattered showers. .SATURDAY NIGHT...Southeast winds 5 to 10 knots, becoming east 10 to 15 knots with gusts up to 20 knots after midnight. Seas 3 to 5 feet. Wave Detail: Northwest 5 feet at 14 seconds and east 3 feet at 8 seconds. Scattered showers in the evening. .SUNDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Seas 5 to 7 feet. Wave Detail: Northwest 7 feet at 13 seconds and east 4 feet at 7 seconds. .SUNDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 8 feet. Wave Detail: North 8 feet at 13 seconds and east 4 feet at 5 seconds. .MONDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 7 feet. Wave Detail: East 6 feet at 6 seconds and north 5 feet at 15 seconds. .MONDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 7 feet. .TUESDAY...East winds 15 to 20 knots. Seas 5 to 7 feet. .TUESDAY NIGHT...East winds 10 to 15 knots. Seas 4 to 6 feet. Scattered showers. .WEDNESDAY...East winds 10 to 15 knots. Seas 4 to 6 feet. Scattered showers. .WEDNESDAY NIGHT...East winds around 10 knots. Seas 3 to 5 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ723-230915- Anegada Passage east of Virgin Gorda and Saint Croix south to 17N- 436 PM AST Fri Aug 22 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY AFTERNOON THROUGH MONDAY AFTERNOON... .TONIGHT...Southeast winds 10 to 15 knots. Seas 3 to 4 feet. Wave Detail: East 3 feet at 7 seconds and northwest 1 foot at 8 seconds. Scattered showers. Isolated thunderstorms after midnight. .SATURDAY...Southeast winds 5 to 10 knots. Seas 3 to 4 feet. Wave Detail: Southeast 3 feet at 7 seconds and northwest 1 foot at 9 seconds. Scattered showers in the morning. .SATURDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: Southeast 4 feet at 6 seconds and northwest 2 feet at 10 seconds. .SUNDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 7 feet. Wave Detail: East 5 feet at 6 seconds and northwest 2 feet at 10 seconds. .SUNDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 7 feet. Wave Detail: East 6 feet at 7 seconds and northwest 2 feet at 10 seconds. .MONDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 6 to 7 feet. Wave Detail: East 7 feet at 8 seconds and northwest 1 foot at 9 seconds. .MONDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 6 to 7 feet. .TUESDAY...East winds 15 to 20 knots. Seas 6 to 7 feet. .TUESDAY NIGHT...East winds around 15 knots. Seas 5 to 6 feet. Scattered showers. .WEDNESDAY...East winds 10 to 15 knots. Seas 4 to 5 feet. Scattered showers. .WEDNESDAY NIGHT...East winds around 10 knots. Seas around 4 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ726-230915- Coastal waters east of Puerto Rico, around Vieques, and around and just north of Culebra and Saint John- 436 PM AST Fri Aug 22 2025 .TONIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: East 3 feet at 7 seconds and northwest 1 foot at 7 seconds. Numerous showers. Isolated thunderstorms after midnight. .SATURDAY...Southeast winds 5 to 10 knots. Seas 2 to 4 feet. Wave Detail: Southeast 3 feet at 7 seconds and northwest 1 foot at 7 seconds. Numerous showers, mainly in the morning. .SATURDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 4 feet. Wave Detail: Southeast 3 feet at 7 seconds. Scattered showers. .SUNDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Seas 3 to 5 feet. Wave Detail: East 4 feet at 5 seconds. .SUNDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 6 feet. Wave Detail: East 5 feet at 6 seconds. .MONDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 6 feet. Wave Detail: East 5 feet at 6 seconds. .MONDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 6 feet. .TUESDAY...East winds 15 to 20 knots. Seas 4 to 6 feet. Scattered showers in the afternoon. .TUESDAY NIGHT...East winds 10 to 15 knots. Seas 4 to 5 feet. Scattered showers. .WEDNESDAY...East winds 10 to 15 knots. Seas 3 to 5 feet. Scattered showers. .WEDNESDAY NIGHT...East winds around 10 knots. Seas 3 to 4 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ733-230915- Caribbean waters of Puerto Rico from 10 NM to 17N, including the coastal waters of Saint Croix- 436 PM AST Fri Aug 22 2025 .TONIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: East 3 feet at 6 seconds. Scattered showers until early morning. Isolated thunderstorms after midnight. Numerous showers late. .SATURDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas around 3 feet. Wave Detail: East 3 feet at 7 seconds. Scattered showers. .SATURDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: Southeast 3 feet at 6 seconds. Scattered showers in the evening. .SUNDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 5 feet. Wave Detail: East 4 feet at 6 seconds. .SUNDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas around 5 feet. Wave Detail: East 5 feet at 6 seconds. .MONDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 6 feet. Wave Detail: East 5 feet at 6 seconds and northwest 1 foot at 11 seconds. .MONDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 6 feet. .TUESDAY...East winds 15 to 20 knots. Seas 5 to 6 feet. .TUESDAY NIGHT...East winds 15 to 20 knots. Seas around 5 feet. .WEDNESDAY...East winds 15 to 20 knots, diminishing to 10 to 15 knots in the afternoon. Seas 4 to 5 feet. Scattered showers. .WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ735-230915- Coastal Waters of Southern Puerto Rico out 10 NM- 436 PM AST Fri Aug 22 2025 .TONIGHT...East winds 10 to 15 knots, diminishing to 5 to 10 knots late this evening and overnight. Seas 2 to 3 feet. Wave Detail: East 3 feet at 6 seconds. Isolated thunderstorms. .SATURDAY...East winds 5 to 10 knots with gusts up to 20 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 6 seconds. Scattered showers in the morning. .SATURDAY NIGHT...East winds 5 to 10 knots, increasing to 10 to 15 knots after midnight. Seas 2 to 3 feet. Wave Detail: East 3 feet at 5 seconds. Scattered showers. .SUNDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Seas 2 to 4 feet. Wave Detail: East 4 feet at 5 seconds. .SUNDAY NIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 3 to 5 feet. Wave Detail: East 4 feet at 6 seconds. .MONDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Seas 3 to 5 feet. Wave Detail: East 4 feet at 6 seconds. Scattered showers in the afternoon. .MONDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 5 feet. .TUESDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Seas 3 to 5 feet. .TUESDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 5 feet. .WEDNESDAY...East winds 10 to 15 knots. Seas 3 to 4 feet. Scattered showers. .WEDNESDAY NIGHT...East winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. Seas 3 to 4 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ741-230915- Mona Passage Southward to 17N- 436 PM AST Fri Aug 22 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY AFTERNOON THROUGH MONDAY AFTERNOON... .TONIGHT...Northeast winds 10 to 15 knots with gusts up to 25 knots. Seas 4 to 5 feet. Wave Detail: East 4 feet at 6 seconds and north 2 feet at 11 seconds. Isolated showers this evening. Numerous showers with isolated thunderstorms after midnight, then scattered showers late. .SATURDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Wave Detail: East 3 feet at 6 seconds and north 3 feet at 11 seconds. Scattered showers in the morning. .SATURDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 6 feet. Wave Detail: North 6 feet at 14 seconds and east 4 feet at 5 seconds. Scattered showers in the evening. .SUNDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Seas 5 to 7 feet. Wave Detail: North 6 feet at 13 seconds and east 5 feet at 7 seconds. .SUNDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 6 to 8 feet. Wave Detail: East 7 feet at 8 seconds and north 6 feet at 12 seconds. .MONDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 6 to 7 feet. Wave Detail: East 7 feet at 9 seconds. .MONDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 6 to 8 feet. .TUESDAY...East winds 15 to 20 knots, diminishing to 10 to 15 knots in the afternoon. Seas 6 to 7 feet. .TUESDAY NIGHT...East winds 15 to 20 knots. Seas 6 to 7 feet. .WEDNESDAY...East winds 15 to 20 knots, diminishing to 10 to 15 knots in the afternoon. Seas 5 to 6 feet. .WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 4 to 5 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ742-230915- Coastal Waters of Northwestern Puerto Rico out 10 NM- 436 PM AST Fri Aug 22 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM SUNDAY AFTERNOON THROUGH MONDAY AFTERNOON... .TONIGHT...Northeast winds 10 to 15 knots with gusts up to 20 knots, becoming east 5 to 10 knots late. Seas 4 to 6 feet. Wave Detail: Northeast 3 feet at 5 seconds and northwest 2 feet at 12 seconds. Scattered showers early this evening, then isolated showers late this evening and overnight. .SATURDAY...East winds 5 to 10 knots. Seas 3 to 4 feet. Wave Detail: Northeast 3 feet at 5 seconds and northwest 3 feet at 11 seconds. Numerous showers in the afternoon. .SATURDAY NIGHT...East winds 5 to 10 knots. Seas 4 to 6 feet. Wave Detail: North 6 feet at 14 seconds and northeast 2 feet at 5 seconds. Scattered showers in the evening. .SUNDAY...East winds around 5 knots, becoming northeast in the afternoon. Seas 5 to 7 feet. Wave Detail: North 7 feet at 13 seconds. Numerous showers in the afternoon. .SUNDAY NIGHT...East winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. Gusts up to 25 knots. Seas 5 to 7 feet. Wave Detail: Northeast 7 feet at 9 seconds and north 7 feet at 13 seconds. Scattered showers in the evening. .MONDAY...East winds 5 to 10 knots, increasing to 10 to 15 knots with gusts up to 25 knots in the afternoon. Seas 4 to 6 feet. Wave Detail: North 6 feet at 11 seconds. Scattered showers in the afternoon. .MONDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas 4 to 6 feet. .TUESDAY...East winds 10 to 15 knots, diminishing to 5 to 10 knots in the afternoon. Seas 4 to 6 feet. Scattered showers in the afternoon. .TUESDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 5 feet. .WEDNESDAY...East winds 5 to 10 knots, diminishing to around 5 knots in the afternoon. Seas 3 to 5 feet. Numerous showers in the afternoon. .WEDNESDAY NIGHT...East winds around 5 knots, increasing to 5 to 10 knots after midnight. Seas 2 to 4 feet. $$ AMZ745-230915- Coastal Waters of Southwestern Puerto Rico out 10 NM- 436 PM AST Fri Aug 22 2025 .TONIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: Northwest 2 feet at 9 seconds and southeast 1 foot at 7 seconds. Scattered showers with isolated thunderstorms early this evening, then isolated showers late this evening. .SATURDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 4 feet. Wave Detail: Southeast 2 feet at 6 seconds and northwest 2 feet at 10 seconds. .SATURDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 4 feet. Wave Detail: Northwest 4 feet at 13 seconds and southeast 2 feet at 4 seconds. Scattered showers in the evening. .SUNDAY...East winds 5 to 10 knots, becoming southeast 10 to 15 knots with gusts up to 25 knots in the afternoon. Seas 4 to 6 feet. Wave Detail: Northwest 6 feet at 13 seconds and southeast 2 feet at 5 seconds. .SUNDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 6 feet. Wave Detail: Northwest 6 feet at 11 seconds and southeast 3 feet at 6 seconds. .MONDAY...East winds 5 to 10 knots, increasing to 10 to 15 knots with gusts up to 25 knots in the afternoon. Seas 4 to 6 feet. Wave Detail: Northwest 5 feet at 11 seconds and 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, becoming northeast 5 to 10 knots after midnight. Seas 4 to 6 feet. .TUESDAY...East winds 5 to 10 knots, becoming southeast 10 to 15 knots in the afternoon. Seas 3 to 5 feet. Scattered showers in the afternoon. .TUESDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 4 feet. .WEDNESDAY...East winds 5 to 10 knots, becoming southeast 10 to 15 knots in the afternoon. Seas 2 to 4 feet. .WEDNESDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 4 feet. Winds and seas higher in and near thunderstorms. $$