Coastal Waters Forecast
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
264 FZCA52 TJSJ 180759 CWFSJU Coastal Waters Forecast National Weather Service San Juan PR 359 AM AST Mon Aug 18 2025 Puerto Rico and the U.S. Virgin Islands Waters AMZ700-182015- 359 AM AST Mon Aug 18 2025 .SYNOPSIS FOR PUERTO RICO AND THE U.S. VIRGIN ISLANDS WATERS... Erin`s outer bands are gradually diminishing over the region. However, abundant moisture will persist, supporting periods of heavy showers, strong thunderstorms and gusty wind conditions across the local waters, though activity is expected to be less widespread than earlier. Despite its continued northward movement, Erin will continue to produce hazardous swell action that will impact the Atlantic and Caribbean passages, but seas should continue to improve today. The National Hurricane Center is also monitoring another tropical wave with a medium chance of development in the next seven days, which could be impacting the regional waters by the end of the workweek into the weekend. $$ AMZ711-182015- Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N- 359 AM AST Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS EVENING... ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...South winds 15 to 20 knots with gusts up to 30 knots. Seas 6 to 8 feet. Wave Detail: South 5 feet at 6 seconds and northwest 5 feet at 10 seconds. Isolated showers early this morning, then scattered showers with isolated thunderstorms late this morning and afternoon. .TONIGHT...South winds 15 to 20 knots, becoming southeast 10 to 15 knots after midnight. Gusts up to 30 knots. Seas 4 to 6 feet. Wave Detail: Southeast 4 feet at 7 seconds and northwest 4 feet at 10 seconds. .TUESDAY...Southeast winds 10 to 15 knots with gusts up to 25 knots. Seas 4 to 5 feet. Wave Detail: Northwest 4 feet at 11 seconds and south 3 feet at 5 seconds. .TUESDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 25 knots. Seas 4 to 6 feet. Wave Detail: Northwest 4 feet at 10 seconds and south 3 feet at 5 seconds. .WEDNESDAY...Southeast winds 10 to 15 knots, becoming east 15 to 20 knots in the afternoon. Seas around 5 feet. Wave Detail: Southeast 4 feet at 6 seconds and northwest 4 feet at 11 seconds. Scattered showers in the morning. .WEDNESDAY NIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 5 to 6 feet. Wave Detail: East 4 feet at 6 seconds and northwest 4 feet at 11 seconds. .THURSDAY...East winds 10 to 15 knots. Seas 5 to 6 feet. .THURSDAY NIGHT...East winds 10 to 15 knots. Seas 5 to 6 feet. Scattered showers. .FRIDAY...Northeast winds 15 to 20 knots. Seas 6 to 8 feet. .FRIDAY NIGHT...Northeast winds 15 to 20 knots. Seas 7 to 8 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ712-182015- Coastal Waters of Northern Puerto Rico out 10 NM- 359 AM AST Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...South winds 10 to 15 knots, increasing to 15 to 20 knots late this morning and early afternoon, then diminishing to 10 to 15 knots late. Seas 5 to 7 feet. Wave Detail: Northwest 5 feet at 10 seconds and east 3 feet at 10 seconds. Scattered showers this morning. Isolated thunderstorms. Numerous showers this afternoon. .TONIGHT...South winds 10 to 15 knots with gusts up to 25 knots, becoming southeast 5 to 10 knots after midnight. Seas 4 to 5 feet. Wave Detail: Northwest 4 feet at 10 seconds and east 3 feet at 9 seconds. .TUESDAY...Southeast winds 5 to 10 knots, becoming east 10 to 15 knots with gusts up to 20 knots in the afternoon. Seas 4 to 5 feet. Wave Detail: Northwest 4 feet at 11 seconds and east 3 feet at 8 seconds. .TUESDAY NIGHT...Southeast winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. Seas 4 to 5 feet. Wave Detail: Northwest 4 feet at 10 seconds and east 3 feet at 8 seconds. .WEDNESDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Wave Detail: Northwest 4 feet at 11 seconds and east 3 feet at 5 seconds. Scattered showers. .WEDNESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas around 5 feet. Wave Detail: East 4 feet at 6 seconds and northwest 4 feet at 11 seconds. .THURSDAY...East winds 10 to 15 knots. Seas 5 to 6 feet. Scattered showers in the afternoon. .THURSDAY NIGHT...East winds 10 to 15 knots. Seas 5 to 6 feet. .FRIDAY...Northeast winds 10 to 15 knots. Seas 5 to 6 feet. Scattered showers in the morning. .FRIDAY NIGHT...Northeast winds 15 to 20 knots. Seas 6 to 8 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ716-182015- Coastal Waters from Cabo San Juan to the waters between Anegada Island and Virgin Gorda and North 10 NM- 359 AM AST Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 AM AST EARLY THIS MORNING... ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...South winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 6 feet. Wave Detail: South 4 feet at 4 seconds and northwest 4 feet at 8 seconds. Scattered showers with isolated thunderstorms. .TONIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 5 feet. Wave Detail: Northwest 4 feet at 10 seconds and south 3 feet at 4 seconds. .TUESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: Northwest 3 feet at 10 seconds and southeast 2 feet at 4 seconds. .TUESDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: East 3 feet at 4 seconds and northwest 3 feet at 11 seconds. Scattered showers. .WEDNESDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 5 feet. Wave Detail: East 4 feet at 5 seconds and northwest 3 feet at 10 seconds. Scattered showers. .WEDNESDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 5 feet. Wave Detail: East 3 feet at 5 seconds and northwest 3 feet at 11 seconds. .THURSDAY...East winds 10 to 15 knots. Seas 3 to 5 feet. Scattered showers. .THURSDAY NIGHT...Northeast winds 10 to 15 knots. Seas 4 to 5 feet. Scattered showers. .FRIDAY...Northeast winds 15 to 20 knots. Seas 5 to 6 feet. Scattered showers in the morning. .FRIDAY NIGHT...Northeast winds 20 to 25 knots, becoming east 15 to 20 knots after midnight. Seas 5 to 8 feet. Numerous showers. Winds and seas higher in and near thunderstorms. $$ AMZ723-182015- Anegada Passage east of Virgin Gorda and Saint Croix south to 17N- 359 AM AST Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 AM AST EARLY THIS MORNING... ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...Southeast winds 15 to 20 knots, diminishing to 10 to 15 knots late. Seas 4 to 5 feet. Wave Detail: South 4 feet at 5 seconds and east 2 feet at 8 seconds. Scattered showers until late afternoon, then isolated showers late. .TONIGHT...Southeast winds around 10 knots. Seas around 3 feet. Wave Detail: Southeast 3 feet at 7 seconds and northwest 1 foot at 8 seconds. .TUESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas around 3 feet. Wave Detail: East 3 feet at 7 seconds and northwest 1 foot at 9 seconds. Scattered showers in the afternoon. .TUESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: Southeast 3 feet at 5 seconds and east 2 feet at 8 seconds. .WEDNESDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet. Wave Detail: East 4 feet at 5 seconds and northwest 1 foot at 10 seconds. Scattered showers in the morning. .WEDNESDAY NIGHT...East winds around 15 knots with gusts up to 25 knots. Seas 4 to 5 feet. Wave Detail: East 4 feet at 6 seconds and northeast 2 feet at 12 seconds. .THURSDAY...East winds around 15 knots. Seas 4 to 5 feet. .THURSDAY NIGHT...Northeast winds around 15 knots. Seas around 5 feet. Scattered showers. .FRIDAY...Northeast winds 15 to 20 knots. Seas 5 to 6 feet. Scattered showers. .FRIDAY NIGHT...Northeast winds 15 to 20 knots, becoming southeast 20 to 25 knots after midnight. Seas 6 to 7 feet, building to 8 feet after midnight. Numerous showers. $$ AMZ726-182015- Coastal waters east of Puerto Rico, around Vieques, and around and just north of Culebra and Saint John- 359 AM AST Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 AM AST EARLY THIS MORNING... ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...South winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet. Wave Detail: Southeast 5 feet at 6 seconds and east 2 feet at 9 seconds. Scattered showers with isolated thunderstorms. .TONIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: Southeast 4 feet at 7 seconds. Scattered showers. .TUESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 7 seconds and northwest 1 foot at 10 seconds. .TUESDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 5 seconds and east 2 feet at 8 seconds. Scattered showers. .WEDNESDAY...East winds around 15 knots with gusts up to 25 knots. Seas 3 to 4 feet. Wave Detail: East 4 feet at 6 seconds and northwest 1 foot at 10 seconds. Scattered showers. .WEDNESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: East 4 feet at 6 seconds and northwest 1 foot at 10 seconds. .THURSDAY...East winds 10 to 15 knots. Seas 3 to 4 feet. Scattered showers. .THURSDAY NIGHT...Northeast winds 10 to 15 knots. Seas 3 to 4 feet. Scattered showers. .FRIDAY...Northeast winds 15 to 20 knots. Seas 4 to 6 feet. Scattered showers in the morning. .FRIDAY NIGHT...Northeast winds 15 to 20 knots. Seas 5 to 7 feet. Numerous showers. Winds and seas higher in and near thunderstorms. $$ AMZ733-182015- Caribbean waters of Puerto Rico from 10 NM to 17N, including the coastal waters of Saint Croix- 359 AM AST Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 AM AST EARLY THIS MORNING... ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...South winds 15 to 20 knots, diminishing to 10 to 15 knots late. Seas 5 to 6 feet. Wave Detail: South 5 feet at 5 seconds and east 2 feet at 10 seconds. Scattered showers until late afternoon. Isolated thunderstorms late this morning and afternoon. Numerous showers late. .TONIGHT...Southeast 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 east 2 feet at 9 seconds. Scattered showers in the evening. .TUESDAY...Southeast 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 10 seconds. .TUESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: Southeast 3 feet at 5 seconds and east 1 foot at 8 seconds. Scattered showers after midnight. .WEDNESDAY...East winds around 15 knots with gusts up to 25 knots. Seas 3 to 4 feet. Wave Detail: East 3 feet at 5 seconds and east 1 foot at 8 seconds. Scattered showers in the morning. .WEDNESDAY NIGHT...East winds around 15 knots with gusts up to 25 knots. Seas 3 to 4 feet. Wave Detail: East 4 feet at 5 seconds and east 1 foot at 8 seconds. .THURSDAY...East winds 10 to 15 knots. Seas around 4 feet. .THURSDAY NIGHT...Northeast winds 10 to 15 knots. Seas 4 to 5 feet. .FRIDAY...Northeast winds 10 to 15 knots. Seas 4 to 6 feet. Scattered showers in the morning. .FRIDAY NIGHT...Northeast winds 15 to 20 knots, becoming east 20 to 25 knots after midnight. Seas 5 to 7 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ735-182015- Coastal Waters of Southern Puerto Rico out 10 NM- 359 AM AST Mon Aug 18 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...South winds 15 to 20 knots, diminishing to 10 to 15 knots late. Seas 4 to 5 feet. Wave Detail: South 5 feet at 6 seconds and east 1 foot at 10 seconds. Numerous showers with isolated thunderstorms. .TONIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: Southeast 4 feet at 6 seconds. Numerous showers, mainly in the evening. .TUESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: Southeast 3 feet at 6 seconds. Scattered showers in the morning. .TUESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 6 seconds. Scattered showers. .WEDNESDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 5 seconds. Scattered showers. .WEDNESDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 5 seconds. .THURSDAY...East winds 10 to 15 knots. Seas 2 to 3 feet. .THURSDAY NIGHT...East winds 10 to 15 knots, becoming northeast 5 to 10 knots after midnight. Seas 3 to 4 feet. .FRIDAY...Northeast winds 5 to 10 knots, becoming east 10 to 15 knots in the afternoon. Seas 3 to 4 feet. Scattered showers in the afternoon. .FRIDAY NIGHT...Northeast winds 10 to 15 knots. Seas 3 to 5 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ741-182015- Mona Passage Southward to 17N- 359 AM AST Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...South winds 15 to 20 knots with gusts up to 25 knots. Seas 6 to 8 feet. Wave Detail: South 5 feet at 5 seconds and north 5 feet at 10 seconds. Scattered showers this morning. Isolated thunderstorms late this morning and afternoon. Numerous showers this afternoon. .TONIGHT...South winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 6 feet. Wave Detail: South 5 feet at 6 seconds and north 4 feet at 11 seconds. Scattered showers. .TUESDAY...Southeast winds around 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Wave Detail: Southeast 4 feet at 6 seconds and northwest 2 feet at 11 seconds. .TUESDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Wave Detail: Southeast 4 feet at 6 seconds and northwest 2 feet at 11 seconds. .WEDNESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Wave Detail: East 4 feet at 7 seconds and northwest 2 feet at 11 seconds. Scattered showers in the afternoon. .WEDNESDAY NIGHT...East winds 10 to 15 knots, increasing to 15 to 20 knots after midnight. Seas 4 to 5 feet. Wave Detail: Southeast 4 feet at 6 seconds and northwest 3 feet at 11 seconds. .THURSDAY...East winds 15 to 20 knots, diminishing to 10 to 15 knots in the afternoon. Seas around 5 feet. .THURSDAY NIGHT...East winds 10 to 15 knots. Seas 4 to 6 feet. .FRIDAY...Northeast winds 10 to 15 knots. Seas 4 to 6 feet. .FRIDAY NIGHT...Northeast winds 15 to 20 knots. Seas 5 to 7 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ742-182015- Coastal Waters of Northwestern Puerto Rico out 10 NM- 359 AM AST Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...South winds 15 to 20 knots with gusts up to 30 knots. Seas 6 to 8 feet. Wave Detail: North 6 feet at 10 seconds and south 5 feet at 6 seconds. Scattered showers this morning. Isolated thunderstorms. Numerous showers this afternoon. .TONIGHT...South winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 4 to 6 feet. Wave Detail: Northwest 5 feet at 10 seconds and south 4 feet at 5 seconds. Numerous showers, mainly in the evening. .TUESDAY...South winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Wave Detail: Northwest 4 feet at 11 seconds and south 3 feet at 5 seconds. Scattered showers in the afternoon. .TUESDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots, diminishing to 5 to 10 knots after midnight. Seas 4 to 5 feet. Wave Detail: South 3 feet at 5 seconds and northwest 3 feet at 10 seconds. .WEDNESDAY...Southeast winds 5 to 10 knots, becoming east 10 to 15 knots with gusts up to 20 knots in the afternoon. Seas 4 to 5 feet. Wave Detail: Northwest 3 feet at 11 seconds and south 2 feet at 6 seconds. Scattered showers in the afternoon. .WEDNESDAY NIGHT...East winds around 5 knots, increasing to 5 to 10 knots after midnight. Seas 3 to 5 feet. Wave Detail: Northwest 3 feet at 11 seconds and south 2 feet at 5 seconds. .THURSDAY...East winds 5 to 10 knots, becoming northeast in the afternoon. Seas 3 to 5 feet. Scattered showers in the afternoon. .THURSDAY NIGHT...Northeast winds 10 to 15 knots. Seas 4 to 6 feet. .FRIDAY...Northeast winds 10 to 15 knots. Seas 4 to 6 feet. Scattered showers in the afternoon. .FRIDAY NIGHT...Northeast winds 15 to 20 knots. Seas 5 to 7 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ745-182015- Coastal Waters of Southwestern Puerto Rico out 10 NM- 359 AM AST Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...South winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 7 feet. Wave Detail: South 5 feet at 5 seconds and northwest 5 feet at 10 seconds. Scattered showers early this morning, then showers with isolated thunderstorms late this morning and afternoon. .TONIGHT...South winds around 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Wave Detail: South 4 feet at 5 seconds and northwest 4 feet at 10 seconds. Numerous showers, mainly in the evening. .TUESDAY...Southeast winds around 15 knots with gusts up to 20 knots. Seas 3 to 5 feet. Wave Detail: South 3 feet at 5 seconds and northwest 3 feet at 11 seconds. .TUESDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: South 3 feet at 5 seconds and northwest 2 feet at 10 seconds. .WEDNESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: Southeast 3 feet at 5 seconds and northwest 3 feet at 11 seconds. .WEDNESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots, diminishing to 5 to 10 knots after midnight. Seas 3 to 4 feet. Wave Detail: Southeast 3 feet at 5 seconds and northwest 3 feet at 11 seconds. .THURSDAY...East winds 5 to 10 knots. Seas 3 to 4 feet. Scattered showers in the afternoon. .THURSDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 4 feet. .FRIDAY...Northeast winds 10 to 15 knots. Seas 3 to 4 feet. Numerous showers in the afternoon. .FRIDAY NIGHT...Northeast winds 15 to 20 knots. Seas 3 to 5 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$