Coastal Waters Forecast
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
680 FZCA52 TJSJ 172141 CWFSJU Coastal Waters Forecast National Weather Service San Juan PR 541 PM AST Sun Aug 17 2025 Puerto Rico and the U.S. Virgin Islands Waters AMZ700-181030- 541 PM AST Sun Aug 17 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. We expect seas to continue to improve tonight through Monday. The National Hurricane Center is also monitoring another tropical wave with a low chance of development in the next seven days, which could be impacting the regional waters by the end of the workweek into the weekend. $$ AMZ711-181030- Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N- 541 PM AST Sun Aug 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY AFTERNOON... .TONIGHT...South winds 20 to 25 knots with gusts up to 35 knots. Seas 7 to 10 feet. Wave Detail: South 6 feet at 6 seconds and northwest 6 feet at 10 seconds. Scattered showers with isolated thunderstorms. .MONDAY...South winds 15 to 20 knots with gusts up to 30 knots. Seas 6 to 8 feet. Wave Detail: South 5 feet at 6 seconds and northwest 4 feet at 9 seconds. Scattered showers. .MONDAY NIGHT...South winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 4 to 6 feet. Wave Detail: Southeast 4 feet at 7 seconds and northwest 3 feet at 9 seconds. Scattered showers early in the evening. .TUESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Wave Detail: Northwest 4 feet at 10 seconds and south 3 feet at 5 seconds. .TUESDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 6 feet. Wave Detail: Northwest 4 feet at 10 seconds and east 3 feet at 7 seconds. Scattered showers. .WEDNESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas around 5 feet. Wave Detail: East 4 feet at 7 seconds and northwest 4 feet at 10 seconds. Scattered showers in the morning. .WEDNESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 5 to 6 feet. .THURSDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas 5 to 6 feet. .THURSDAY NIGHT...Northeast winds 10 to 15 knots, increasing to 15 to 20 knots after midnight. Seas 5 to 6 feet. .FRIDAY...Northeast winds 15 to 20 knots with gusts up to 25 knots. Seas 6 to 8 feet. .FRIDAY NIGHT...Northeast winds 15 to 20 knots, becoming east 20 to 25 knots after midnight. Seas 7 to 8 feet. Winds and seas higher in and near thunderstorms. $$ AMZ712-181030- Coastal Waters of Northern Puerto Rico out 10 NM- 541 PM AST Sun Aug 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY AFTERNOON... .TONIGHT...South winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 8 feet. Wave Detail: Northwest 7 feet at 10 seconds and southwest 2 feet at 6 seconds. Scattered showers until early morning. Isolated thunderstorms after midnight. Isolated showers late. .MONDAY...South winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Seas 4 to 6 feet. Wave Detail: Northwest 4 feet at 9 seconds and south 3 feet at 5 seconds. Scattered showers in the late morning and afternoon. .MONDAY NIGHT...South winds 10 to 15 knots with gusts up to 20 knots, becoming southeast 5 to 10 knots after midnight. Seas 4 to 5 feet. Wave Detail: Northwest 4 feet at 9 seconds and east 2 feet at 9 seconds. Scattered showers early in the evening. .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 10 seconds and east 3 feet at 8 seconds. Scattered showers in the afternoon. .TUESDAY NIGHT...Southeast winds 5 to 10 knots. Seas 4 to 5 feet. Wave Detail: Northwest 4 feet at 10 seconds and east 3 feet at 8 seconds. Scattered showers. .WEDNESDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Wave Detail: Northwest 4 feet at 10 seconds and east 3 feet at 5 seconds. Scattered showers. .WEDNESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots, diminishing to 5 to 10 knots after midnight. Seas around 5 feet. .THURSDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas 5 to 6 feet. Scattered showers in the afternoon. .THURSDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas 5 to 6 feet. Scattered showers. .FRIDAY...East winds 10 to 15 knots, becoming northeast 15 to 20 knots in the afternoon. Seas 5 to 6 feet. Scattered showers in the morning. .FRIDAY NIGHT...Northeast winds 15 to 20 knots with gusts up to 30 knots. Seas 6 to 8 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ716-181030- Coastal Waters from Cabo San Juan to the waters between Anegada Island and Virgin Gorda and North 10 NM- 541 PM AST Sun Aug 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .TONIGHT...South winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 6 feet. Wave Detail: Northwest 5 feet at 9 seconds and south 4 feet at 5 seconds. Scattered showers until early morning. Isolated thunderstorms after midnight. Numerous showers late. .MONDAY...South winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 6 feet. Wave Detail: South 4 feet at 4 seconds and northwest 4 feet at 8 seconds. Scattered showers. .MONDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 5 feet. Wave Detail: South 3 feet at 4 seconds and northwest 3 feet at 9 seconds. .TUESDAY...Southeast winds 10 to 15 knots. Seas 3 to 4 feet. Wave Detail: Northwest 3 feet at 9 seconds and southeast 2 feet at 4 seconds. Scattered showers in the afternoon. .TUESDAY NIGHT...Southeast winds 10 to 15 knots. Seas 3 to 4 feet. Wave Detail: East 3 feet at 6 seconds and northwest 3 feet at 10 seconds. Scattered showers. .WEDNESDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 5 feet. Wave Detail: East 3 feet at 4 seconds and northwest 3 feet at 10 seconds. Scattered showers in the morning. .WEDNESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 5 feet. .THURSDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 5 feet. Scattered showers in the morning. .THURSDAY NIGHT...Northeast winds 10 to 15 knots, increasing to 15 to 20 knots after midnight. Seas 4 to 5 feet. Scattered showers. .FRIDAY...Northeast winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 6 feet. Scattered showers in the morning. .FRIDAY NIGHT...Northeast winds 20 to 25 knots with gusts up to 35 knots. Seas 5 to 8 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ723-181030- Anegada Passage east of Virgin Gorda and Saint Croix south to 17N- 541 PM AST Sun Aug 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .TONIGHT...South winds 15 to 20 knots with gusts up to 25 knots. Seas around 6 feet, subsiding to 4 to 5 feet after midnight. Wave Detail: South 5 feet at 6 seconds and north 1 foot at 9 seconds. Scattered showers. Isolated thunderstorms late this evening. Isolated thunderstorms late. .MONDAY...Southeast winds 15 to 20 knots, diminishing to 10 to 15 knots in the afternoon. Seas 4 to 5 feet. Wave Detail: Southeast 4 feet at 7 seconds and northwest 1 foot at 7 seconds. Scattered showers until late afternoon. .MONDAY NIGHT...Southeast winds around 10 knots. Seas 3 to 4 feet. Wave Detail: Southeast 4 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 8 seconds. Scattered showers. .TUESDAY NIGHT...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 and northwest 1 foot at 8 seconds. Scattered showers in the evening. .WEDNESDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Wave Detail: East 4 feet at 5 seconds and northeast 2 feet at 13 seconds. .WEDNESDAY NIGHT...East winds around 15 knots with gusts up to 25 knots. Seas 4 to 5 feet. .THURSDAY...East winds around 15 knots with gusts up to 25 knots. Seas 4 to 5 feet. .THURSDAY NIGHT...Northeast winds 15 to 20 knots with gusts up to 25 knots. Seas around 5 feet. Scattered showers. .FRIDAY...Northeast winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 6 feet. .FRIDAY NIGHT...East winds 20 to 25 knots with gusts up to 35 knots. Seas 6 to 7 feet, building to 8 feet after midnight. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ726-181030- Coastal waters east of Puerto Rico, around Vieques, and around and just north of Culebra and Saint John- 541 PM AST Sun Aug 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .TONIGHT...South winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 6 feet. Wave Detail: South 6 feet at 6 seconds and east 2 feet at 9 seconds. Scattered showers until early morning. Isolated thunderstorms after midnight. Numerous showers late. .MONDAY...South winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet. Wave Detail: South 4 feet at 6 seconds and east 2 feet at 9 seconds. Scattered showers. .MONDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: Southeast 4 feet at 7 seconds. Scattered showers early in the evening. Scattered showers after midnight. .TUESDAY...Southeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 7 seconds. Scattered showers in the afternoon. .TUESDAY NIGHT...East winds 5 to 10 knots, increasing to 10 to 15 knots with gusts up to 20 knots after midnight. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 6 seconds. Scattered showers. .WEDNESDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: East 3 feet at 5 seconds and northwest 1 foot at 10 seconds. Scattered showers in the morning. .WEDNESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. .THURSDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Scattered showers. .THURSDAY NIGHT...Northeast winds 10 to 15 knots, increasing to 15 to 20 knots after midnight. Seas 3 to 4 feet. Scattered showers. .FRIDAY...Northeast winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 6 feet. Scattered showers in the morning. .FRIDAY NIGHT...Northeast winds 20 to 25 knots with gusts up to 35 knots. Seas 5 to 7 feet. Numerous showers. Winds and seas higher in and near thunderstorms. $$ AMZ733-181030- Caribbean waters of Puerto Rico from 10 NM to 17N, including the coastal waters of Saint Croix- 541 PM AST Sun Aug 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .TONIGHT...South winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 6 feet. Wave Detail: South 5 feet at 6 seconds and east 3 feet at 10 seconds. Scattered showers with isolated thunderstorms. .MONDAY...South winds 15 to 20 knots with gusts up to 25 knots. Seas around 5 feet. Wave Detail: South 5 feet at 5 seconds and east 2 feet at 10 seconds. Scattered showers until late afternoon. Numerous showers late. .MONDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas around 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. Scattered showers. .TUESDAY NIGHT...East winds 5 to 10 knots, increasing to 10 to 15 knots with gusts up to 20 knots after midnight. Seas 3 to 4 feet. Wave Detail: East 3 feet at 7 seconds. Scattered showers. .WEDNESDAY...East winds 10 to 15 knots with gusts up to 20 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 10 to 15 knots with gusts up to 25 knots. Seas 3 to 4 feet. .THURSDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas around 4 feet. .THURSDAY NIGHT...Northeast winds 10 to 15 knots, increasing to 15 to 20 knots after midnight. Seas 4 to 5 feet. .FRIDAY...Northeast winds 15 to 20 knots with gusts up to 25 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. Gusts up to 35 knots. Seas 5 to 7 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ735-181030- Coastal Waters of Southern Puerto Rico out 10 NM- 541 PM AST Sun Aug 17 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TONIGHT...South winds 10 to 15 knots, increasing to 15 to 20 knots after midnight. Seas 4 to 5 feet. Wave Detail: South 4 feet at 6 seconds and east 1 foot at 10 seconds. Scattered showers with isolated thunderstorms. .MONDAY...South winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet. Wave Detail: South 5 feet at 6 seconds and east 1 foot at 10 seconds. Scattered showers in the morning, then numerous showers in the afternoon. .MONDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: Southeast 4 feet at 6 seconds. Numerous showers early in the evening, then scattered showers in the late evening and early morning. .TUESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. Wave Detail: Southeast 3 feet at 6 seconds. Scattered showers in the morning. .TUESDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 6 seconds. Scattered showers. .WEDNESDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 6 seconds. .WEDNESDAY NIGHT...East winds 5 to 10 knots, increasing to 10 to 15 knots with gusts up to 20 knots after midnight. Seas 2 to 3 feet. .THURSDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet. .THURSDAY NIGHT...Northeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet. .FRIDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 4 feet. .FRIDAY NIGHT...Northeast winds 10 to 15 knots, increasing to 15 to 20 knots after midnight. Gusts up to 30 knots. Seas 3 to 5 feet. Numerous showers. Winds and seas higher in and near thunderstorms. $$ AMZ741-181030- Mona Passage Southward to 17N- 541 PM AST Sun Aug 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY AFTERNOON... .TONIGHT...South winds 15 to 20 knots with gusts up to 30 knots. Seas 6 to 9 feet. Wave Detail: Northeast 6 feet at 11 seconds and southwest 4 feet at 5 seconds. Scattered showers. .MONDAY...South winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 7 feet. Wave Detail: North 5 feet at 9 seconds and south 4 feet at 5 seconds. Scattered showers in the morning. Numerous showers in the afternoon. .MONDAY NIGHT...South winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Wave Detail: South 4 feet at 6 seconds and north 4 feet at 10 seconds. Scattered showers until early morning. .TUESDAY...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 north 3 feet at 10 seconds. .TUESDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Wave Detail: East 3 feet at 7 seconds and northwest 3 feet at 11 seconds. Scattered showers after midnight. .WEDNESDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Wave Detail: East 3 feet at 7 seconds and north 3 feet at 11 seconds. .WEDNESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. .THURSDAY...East winds 15 to 20 knots, diminishing to 10 to 15 knots in the afternoon. Seas around 5 feet. .THURSDAY NIGHT...Northeast winds 10 to 15 knots with gusts up to 25 knots. Seas 4 to 6 feet. .FRIDAY...Northeast winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Seas 4 to 6 feet. .FRIDAY NIGHT...Northeast winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 7 feet. Scattered showers. $$ AMZ742-181030- Coastal Waters of Northwestern Puerto Rico out 10 NM- 541 PM AST Sun Aug 17 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY AFTERNOON... .TONIGHT...South winds 15 to 20 knots with gusts up to 30 knots. Seas 6 to 9 feet. Wave Detail: North 6 feet at 9 seconds and northeast 6 feet at 11 seconds. Scattered showers until early morning, then isolated showers late. .MONDAY...South winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 7 feet. Wave Detail: Southwest 5 feet at 5 seconds and north 5 feet at 9 seconds. Scattered showers in the morning. Numerous showers in the afternoon. .MONDAY NIGHT...South winds 10 to 15 knots with gusts up to 25 knots. Seas 4 to 5 feet. Wave Detail: South 4 feet at 5 seconds and northwest 4 feet at 9 seconds. Numerous showers early in the evening, then scattered showers in the late evening and overnight. .TUESDAY...South winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet. Wave Detail: Northwest 4 feet at 10 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: Northwest 4 feet at 10 seconds and south 3 feet at 5 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 4 feet at 10 seconds and south 2 feet at 5 seconds. Scattered showers in the afternoon. .WEDNESDAY NIGHT...East winds around 5 knots. Seas 3 to 5 feet. .THURSDAY...East winds 5 to 10 knots, becoming northeast 10 to 15 knots in the afternoon. Seas 3 to 5 feet. Scattered showers in the afternoon. .THURSDAY NIGHT...Northeast winds 10 to 15 knots with gusts up to 25 knots. Seas 4 to 6 feet. .FRIDAY...Northeast winds 10 to 15 knots with gusts up to 25 knots. Seas 4 to 6 feet. Scattered showers in the afternoon. .FRIDAY NIGHT...Northeast winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 7 feet. $$ AMZ745-181030- Coastal Waters of Southwestern Puerto Rico out 10 NM- 541 PM AST Sun Aug 17 2025 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TONIGHT...South winds 15 to 20 knots with gusts up to 25 knots. Seas around 7 feet, subsiding to 4 to 6 feet after midnight. Wave Detail: Southwest 5 feet at 6 seconds. Scattered showers. Isolated thunderstorms late this evening. .MONDAY...South winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 6 feet. Wave Detail: South 4 feet at 5 seconds and northwest 4 feet at 9 seconds. Scattered showers in the morning. Showers in the afternoon. .MONDAY NIGHT...South winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 5 feet. Wave Detail: South 4 feet at 5 seconds and northwest 3 feet at 9 seconds. Numerous showers early in the evening, then scattered showers in the late evening and early morning. .TUESDAY...Southeast winds 10 to 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 10 seconds. .TUESDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots, becoming east 5 to 10 knots after midnight. Seas 3 to 4 feet. Wave Detail: South 3 feet at 5 seconds and northwest 3 feet at 10 seconds. .WEDNESDAY...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 3 feet at 11 seconds. Scattered showers in the afternoon. .WEDNESDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 4 feet. .THURSDAY...East winds 5 to 10 knots. Seas 3 to 4 feet. Scattered showers in the afternoon. .THURSDAY NIGHT...Northeast winds 5 to 10 knots. Seas 3 to 4 feet. .FRIDAY...Northeast winds around 5 knots. Seas 3 to 4 feet. Scattered showers in the afternoon. .FRIDAY NIGHT...Northeast winds 5 to 10 knots, increasing to 15 to 20 knots with gusts up to 25 knots after midnight. Seas 3 to 5 feet. Winds and seas higher in and near thunderstorms. $$