Coastal Waters Forecast
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
646 FZCA52 TJSJ 212009 CWFSJU Coastal Waters Forecast National Weather Service San Juan PR 409 PM AST Mon Jul 21 2025 Puerto Rico and the U.S. Virgin Islands Waters AMZ700-220915- 409 PM AST Mon Jul 21 2025 .SYNOPSIS FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS WATERS... A surface high pressure over the central Atlantic and tropical waves moving across the Caribbean Sea will promote moderate to fresh trades through the rest of the week. A weak easterly perturbation will move across the local area through tonight, followed by a more robust tropical wave after midweek. Despite the expected systems expected this week, afternoon convective activity will promote showers and thunderstorms each day over portions of western Puerto Rico and surrounding waters. $$ AMZ711-220915- Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N- 409 PM AST Mon Jul 21 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TONIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds and northeast 1 foot at 9 seconds. Scattered showers this evening. Numerous showers after midnight, then scattered showers late. .TUESDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas around 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds and northeast 1 foot at 9 seconds. .TUESDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 7 seconds and northeast 1 foot at 9 seconds. .WEDNESDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 7 seconds. .WEDNESDAY NIGHT...East winds 15 to 20 knots, increasing to 20 to 25 knots after midnight. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 7 seconds. Scattered showers. .THURSDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 7 seconds. .THURSDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 6 feet, occasionally to 8 feet. Scattered showers. .FRIDAY...East winds 10 to 15 knots. Seas 4 to 5 feet, occasionally to 6 feet. Numerous showers, mainly in the morning. .FRIDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. .SATURDAY...East winds around 15 knots. Seas around 4 feet, occasionally to 5 feet. .SATURDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Scattered showers. $$ AMZ712-220915- Coastal Waters of Northern Puerto Rico out 10 NM- 409 PM AST Mon Jul 21 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TONIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots late this evening and overnight. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 4 feet at 6 seconds and northeast 1 foot at 10 seconds. Scattered showers early this evening, then numerous showers late this evening and early morning. Scattered showers late. .TUESDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Gusts up to 30 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds and northeast 1 foot at 9 seconds. Scattered showers in the afternoon. .TUESDAY NIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Gusts up to 30 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 6 seconds and northeast 1 foot at 9 seconds. .WEDNESDAY...East winds 15 to 20 knots, increasing to 20 to 25 knots in the afternoon. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 5 feet at 7 seconds. Scattered showers. .WEDNESDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 7 seconds. Scattered showers. .THURSDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 7 seconds. Scattered showers in the morning. .THURSDAY NIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Gusts up to 30 knots. Seas 4 to 6 feet, occasionally to 8 feet. Numerous showers. .FRIDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Seas 4 to 5 feet, occasionally to 6 feet. Numerous showers. Scattered thunderstorms in the afternoon. .FRIDAY NIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 3 to 5 feet, occasionally to 6 feet. Scattered showers. .SATURDAY...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. .SATURDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ716-220915- Coastal Waters from Cabo San Juan to the waters between Anegada Island and Virgin Gorda and North 10 NM- 409 PM AST Mon Jul 21 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TONIGHT...East winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 6 seconds and northeast 1 foot at 10 seconds. Numerous showers early this evening, then scattered showers late this evening and overnight. .TUESDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 6 seconds and northeast 1 foot at 9 seconds. .TUESDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 5 seconds and northeast 1 foot at 9 seconds. .WEDNESDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 6 seconds. Scattered showers. .WEDNESDAY NIGHT...East winds 20 to 25 knots with gusts up to 30 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 6 seconds. Scattered showers. .THURSDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 6 seconds. Scattered showers. .THURSDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. Scattered showers. .FRIDAY...East winds around 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Numerous showers. Scattered thunderstorms in the afternoon. .FRIDAY NIGHT...East winds around 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. .SATURDAY...East winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. .SATURDAY NIGHT...East winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ723-220915- Anegada Passage east of Virgin Gorda and Saint Croix south to 17N- 409 PM AST Mon Jul 21 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TONIGHT...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 6 seconds and northeast 1 foot at 10 seconds. Numerous showers early this evening, then scattered showers late this evening and overnight. .TUESDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas around 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 6 seconds and northeast 1 foot at 9 seconds. .TUESDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 6 seconds and northeast 1 foot at 9 seconds. Scattered showers in the evening. .WEDNESDAY...East winds around 20 knots with gusts up to 30 knots. Seas around 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 7 seconds. .WEDNESDAY NIGHT...East winds 20 to 25 knots with gusts up to 30 knots. Seas 6 to 7 feet, occasionally to 9 feet. Wave Detail: East 7 feet at 7 seconds. Scattered showers. .THURSDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: East 7 feet at 7 seconds. Scattered showers. .THURSDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas around 5 feet, occasionally to 6 feet. Numerous showers. .FRIDAY...East winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Numerous showers in the morning. .FRIDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. .SATURDAY...East winds 15 to 20 knots. Seas around 5 feet, occasionally to 6 feet. .SATURDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Scattered showers. $$ AMZ726-220915- Coastal waters east of Puerto Rico, around Vieques, and around and just north of Culebra and Saint John- 409 PM AST Mon Jul 21 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TONIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 6 seconds. Numerous showers, mainly this evening. .TUESDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 6 seconds. .TUESDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 6 seconds. .WEDNESDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 6 seconds. Scattered showers. .WEDNESDAY NIGHT...East winds 20 to 25 knots with gusts up to 30 knots. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: East 7 feet at 7 seconds. Scattered showers. .THURSDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: East 7 feet at 7 seconds. Scattered showers in the afternoon. .THURSDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Numerous showers. .FRIDAY...East winds around 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers. .FRIDAY NIGHT...East winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. .SATURDAY...East winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. .SATURDAY NIGHT...East winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers. $$ AMZ733-220915- Caribbean waters of Puerto Rico from 10 NM to 17N, including the coastal waters of Saint Croix- 409 PM AST Mon Jul 21 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TONIGHT...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 6 seconds. Scattered showers early this evening, then numerous showers late this evening. Scattered showers after midnight. .TUESDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas around 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 6 seconds. .TUESDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 7 seconds. .WEDNESDAY...East winds around 20 knots with gusts up to 30 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 6 seconds. Scattered showers. .WEDNESDAY NIGHT...East winds 20 to 25 knots with gusts up to 35 knots. Seas 6 to 7 feet, occasionally to 9 feet. Wave Detail: 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, occasionally to 10 feet. Wave Detail: East 7 feet at 7 seconds. Scattered showers. .THURSDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 6 feet, occasionally to 8 feet. Numerous showers. .FRIDAY...East winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Numerous showers, mainly in the morning. .FRIDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Scattered showers. .SATURDAY...East winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Scattered showers. .SATURDAY NIGHT...East winds around 15 knots. Seas 4 to 5 feet, occasionally to 6 feet. Scattered showers. $$ AMZ735-220915- Coastal Waters of Southern Puerto Rico out 10 NM- 409 PM AST Mon Jul 21 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TONIGHT...East winds 10 to 15 knots, increasing to 15 to 20 knots late. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 6 seconds. Numerous showers. .TUESDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 6 seconds. .TUESDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 6 seconds. .WEDNESDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 6 seconds. Scattered showers. .WEDNESDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 7 seconds. Scattered showers. .THURSDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 7 seconds. Scattered showers. .THURSDAY NIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Gusts up to 30 knots. Seas 4 to 6 feet, occasionally to 8 feet. Scattered showers. .FRIDAY...East winds 10 to 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Numerous showers in the morning. .FRIDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. .SATURDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers in the morning. .SATURDAY NIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 3 to 4 feet, occasionally to 5 feet. $$ AMZ741-220915- Mona Passage Southward to 17N- 409 PM AST Mon Jul 21 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TONIGHT...East winds 10 to 15 knots, increasing to 15 to 20 knots after midnight. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds and northeast 1 foot at 10 seconds. Isolated showers this evening, then scattered showers after midnight. Numerous showers late. .TUESDAY...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 6 seconds and northeast 1 foot at 10 seconds. Scattered showers in the morning. .TUESDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 7 seconds and northeast 1 foot at 9 seconds. .WEDNESDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 7 seconds. .WEDNESDAY NIGHT...East winds 20 to 25 knots with gusts up to 30 knots. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: 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 5 to 8 feet, occasionally to 10 feet. Wave Detail: East 8 feet at 7 seconds. Scattered showers. .THURSDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 7 feet, occasionally to 9 feet. Scattered showers. .FRIDAY...East winds 15 to 20 knots, diminishing to 10 to 15 knots in the afternoon. Seas 4 to 6 feet, occasionally to 8 feet. Scattered showers. .FRIDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Scattered showers. .SATURDAY...East winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Scattered showers. .SATURDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Scattered showers. $$ AMZ742-220915- Coastal Waters of Northwestern Puerto Rico out 10 NM- 409 PM AST Mon Jul 21 2025 .TONIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 3 feet at 6 seconds and northeast 1 foot at 10 seconds. Scattered showers early this evening, then isolated showers late this evening and overnight. .TUESDAY...East winds 5 to 10 knots, becoming northeast 10 to 15 knots with gusts up to 25 knots in the afternoon. Seas 2 to 3 feet, occasionally to 4 feet. Wave Detail: Northeast 3 feet at 6 seconds and northeast 1 foot at 10 seconds. Scattered showers in the afternoon. .TUESDAY 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 6 seconds and northeast 1 foot at 9 seconds. Scattered showers in the evening. .WEDNESDAY...East winds 10 to 15 knots. Gusts up to 30 knots in the afternoon. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 3 feet at 7 seconds. Scattered showers in the afternoon. .WEDNESDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 4 feet at 6 seconds. .THURSDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 4 feet at 6 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, occasionally to 6 feet. .FRIDAY...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Numerous showers and scattered thunderstorms in the afternoon. .FRIDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. .SATURDAY...East winds 5 to 10 knots, increasing to 10 to 15 knots in the afternoon. Seas 2 to 3 feet, occasionally 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 3 feet, occasionally to 4 feet. Winds and seas higher in and near thunderstorms. $$ AMZ745-220915- Coastal Waters of Southwestern Puerto Rico out 10 NM- 409 PM AST Mon Jul 21 2025 .TONIGHT...Northeast winds 5 to 10 knots. Seas around 2 feet. Wave Detail: Southeast 2 feet at 6 seconds. Isolated showers early this evening, then scattered showers late this evening and early morning. Isolated showers late. .TUESDAY...Southeast winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 3 feet, occasionally to 4 feet. Wave Detail: Southeast 3 feet at 6 seconds. .TUESDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots, diminishing to 5 to 10 knots after midnight. Seas 2 to 3 feet, occasionally to 4 feet. Wave Detail: Southeast 3 feet at 6 seconds. .WEDNESDAY...East winds 5 to 10 knots, increasing to 10 to 15 knots with gusts up to 25 knots in the afternoon. Seas 2 to 3 feet, occasionally to 4 feet. Wave Detail: Southeast 3 feet at 6 seconds. Scattered showers in the afternoon. .WEDNESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet, occasionally to 4 feet. Wave Detail: East 3 feet at 6 seconds. .THURSDAY...East winds 10 to 15 knots, becoming southeast 15 to 20 knots in the afternoon. Gusts up to 30 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 4 feet at 5 seconds. Numerous showers in the afternoon. .THURSDAY NIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 2 to 4 feet, occasionally to 5 feet. .FRIDAY...East winds 5 to 10 knots. Seas 2 to 3 feet, occasionally to 4 feet. Scattered showers in the afternoon. .FRIDAY NIGHT...East winds 5 to 10 knots. Seas around 2 feet. .SATURDAY...East winds 5 to 10 knots, becoming southeast 10 to 15 knots in the afternoon. Seas around 2 feet. Scattered showers in the afternoon. .SATURDAY NIGHT...East winds 15 to 20 knots, diminishing to 5 to 10 knots after midnight. Seas 2 to 3 feet, occasionally to 4 feet. $$