Coastal Waters Forecast
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
560 FZCA52 TJSJ 080756 CWFSJU Coastal Waters Forecast National Weather Service San Juan PR 356 AM AST Tue Sep 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. AMZ700-082015- 356 AM AST Tue Sep 8 2026 .Synopsis for Puerto Rico and the U.S. Virgin Islands Waters... Surface high pressure strengthening across the central Atlantic will promote moderate to fresh winds, with higher gusts, today and over the next few days. This will result in choppy to locally rough marine conditions. Seas will generally build to 4 to 6 feet across the offshore waters and local passages, with occasional seas up to 8 feet possible by tonight and through around next Thursday. Passing showers will continue across portions of the regional waters today, with locally higher winds and seas possible in and near thunderstorms. A tropical wave arriving by midweek will bring additional periods of showers and thunderstorms Wednesday and Thursday. $$ AMZ711-082015- Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N- 356 AM AST Tue Sep 8 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 10 to 15 knots, increasing to 15 to 20 knots late this morning and afternoon. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 7 seconds and northeast 2 feet at 10 seconds. Isolated showers. .TONIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds and northeast 2 feet at 11 seconds. Scattered showers after midnight. .WEDNESDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 7 seconds and northeast 2 feet at 11 seconds. Scattered showers in the morning. .WEDNESDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 7 seconds and northeast 2 feet at 11 seconds. .THURSDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 7 seconds and north 2 feet at 10 seconds. .THURSDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 8 seconds and north 2 feet at 9 seconds. .FRIDAY...East winds 15 to 20 knots. Seas 5 to 6 feet, occasionally to 8 feet. .FRIDAY NIGHT...East winds 15 to 20 knots. Seas around 5 feet, occasionally to 6 feet. .SATURDAY...East winds around 15 knots. Seas 4 to 5 feet, occasionally to 6 feet. .SATURDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. $$ AMZ712-082015- Coastal Waters of Northern Puerto Rico out 10 NM- 356 AM AST Tue Sep 8 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 5 to 10 knots, increasing to 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 7 seconds and northeast 2 feet at 11 seconds. Scattered showers, mainly this morning. .TONIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 7 seconds and northeast 2 feet at 11 seconds. Scattered showers after midnight. .WEDNESDAY...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 2 feet at 11 seconds. Numerous showers, mainly in the morning. .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: Northeast 5 feet at 7 seconds and northeast 2 feet at 11 seconds. Scattered showers after midnight. .THURSDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Gusts up to 30 knots. Seas around 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds and northeast 2 feet at 11 seconds. Scattered showers. .THURSDAY NIGHT...East winds 10 to 15 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 north 2 feet at 9 seconds. .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. .FRIDAY NIGHT...East winds 10 to 15 knots. Seas 4 to 5 feet, occasionally to 6 feet. .SATURDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Seas 4 to 5 feet, occasionally to 6 feet. .SATURDAY NIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 4 to 5 feet, occasionally to 6 feet. Scattered showers. $$ AMZ716-082015- Coastal Waters from Cabo San Juan to the waters between Anegada Island and Virgin Gorda and North 10 NM- 356 AM AST Tue Sep 8 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 6 seconds and northeast 2 feet at 10 seconds. Scattered showers. .TONIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 3 feet at 6 seconds and northeast 2 feet at 10 seconds. Scattered showers. .WEDNESDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 6 seconds and northeast 2 feet at 11 seconds. Scattered showers in the morning. .WEDNESDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 6 seconds and northeast 2 feet at 11 seconds. Scattered showers after midnight. .THURSDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East 4 feet at 6 seconds and northeast 1 foot at 11 seconds. Scattered showers. .THURSDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 6 seconds and north 2 feet at 10 seconds. .FRIDAY...East winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Scattered showers in the morning. .FRIDAY NIGHT...East winds around 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. .SATURDAY...East winds around 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. .SATURDAY NIGHT...East winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. $$ AMZ723-082015- Anegada Passage east of Virgin Gorda and Saint Croix south to 17N- 356 AM AST Tue Sep 8 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...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 2 feet at 11 seconds. Isolated showers this morning. .TONIGHT...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 6 seconds and northeast 2 feet at 11 seconds. Scattered showers in the evening, then numerous showers after midnight. .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 6 seconds and northeast 2 feet at 11 seconds. Scattered showers in the morning. .WEDNESDAY NIGHT...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 and northeast 1 foot at 11 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 and northeast 1 foot at 11 seconds. Scattered showers in the afternoon. .THURSDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 7 seconds and north 1 foot at 10 seconds. .FRIDAY...East winds 15 to 20 knots. Seas 5 to 6 feet, occasionally to 8 feet. .FRIDAY NIGHT...East winds 15 to 20 knots. Seas around 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 around 5 feet, occasionally to 6 feet. $$ AMZ726-082015- Coastal waters east of Puerto Rico, around Vieques, and around and just north of Culebra and Saint John- 356 AM AST Tue Sep 8 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 6 seconds. Scattered showers this morning, then isolated showers early this afternoon. Scattered showers late. .TONIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 6 seconds. Scattered showers in the evening, then numerous showers after midnight. .WEDNESDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East 4 feet at 6 seconds. Scattered showers. .WEDNESDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 7 seconds. Scattered showers. .THURSDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 6 seconds. Scattered showers. .THURSDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: Southeast 5 feet at 7 seconds. .FRIDAY...East winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Scattered showers in the morning. .FRIDAY NIGHT...East winds around 15 knots. Seas 4 to 5 feet, occasionally to 6 feet. .SATURDAY...East winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. .SATURDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. $$ AMZ733-082015- Caribbean waters of Puerto Rico from 10 NM to 17N, including the coastal waters of Saint Croix- 356 AM AST Tue Sep 8 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 6 seconds. Scattered showers early this morning, then isolated showers late this morning and afternoon. .TONIGHT...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 after midnight. .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 5 feet at 6 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. .THURSDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 7 seconds. Scattered showers in the evening. .FRIDAY...East winds 15 to 20 knots. Seas 5 to 6 feet, occasionally to 8 feet. .FRIDAY NIGHT...East winds 15 to 20 knots. Seas 5 to 6 feet, occasionally to 8 feet. .SATURDAY...East winds 15 to 20 knots. Seas 5 to 6 feet, occasionally to 8 feet. .SATURDAY NIGHT...East winds 15 to 20 knots. Seas 5 to 6 feet, occasionally to 8 feet. $$ AMZ735-082015- Coastal Waters of Southern Puerto Rico out 10 NM- 356 AM AST Tue Sep 8 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 10 to 15 knots, increasing to 15 to 20 knots this afternoon. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds. Scattered showers early this morning, then isolated showers late this morning and afternoon. .TONIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 4 feet at 6 seconds. .WEDNESDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Southeast 4 feet at 6 seconds. Numerous showers in the morning. .WEDNESDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Southeast 4 feet at 7 seconds. Numerous showers after midnight. .THURSDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Southeast 4 feet at 7 seconds. Numerous showers, mainly in the morning. .THURSDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 7 seconds. Scattered showers in the evening. .FRIDAY...East winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. .FRIDAY NIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 4 to 5 feet, occasionally to 6 feet. .SATURDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Seas 4 to 5 feet, occasionally to 6 feet. .SATURDAY NIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 3 to 5 feet, occasionally to 6 feet. $$ AMZ741-082015- Mona Passage Southward to 17N- 356 AM AST Tue Sep 8 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 10 to 15 knots, increasing to 15 to 20 knots this afternoon. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds and northeast 1 foot at 9 seconds. Isolated showers. .TONIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Southeast 5 feet at 6 seconds and northeast 1 foot at 10 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 and northeast 1 foot at 10 seconds. Scattered showers in the afternoon. .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 and northeast 1 foot at 11 seconds. .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 and north 1 foot at 11 seconds. Scattered showers in the afternoon. .THURSDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 7 seconds and north 2 feet at 10 seconds. .FRIDAY...East winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Scattered showers in the morning. .FRIDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. .SATURDAY...East winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. .SATURDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. $$ AMZ742-082015- Coastal Waters of Northwestern Puerto Rico out 10 NM- 356 AM AST Tue Sep 8 2026 .TODAY...East winds around 5 knots, becoming northeast this afternoon. Seas 2 to 3 feet. Wave Detail: Northeast 2 feet at 11 seconds and south 1 foot at 5 seconds. Numerous showers with isolated thunderstorms this afternoon. .TONIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 2 feet at 10 seconds and south 1 foot at 5 seconds. Scattered showers in the evening. .WEDNESDAY...East winds 5 to 10 knots, increasing to 10 to 15 knots in the afternoon. Gusts up to 25 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 3 feet at 7 seconds and northeast 2 feet at 11 seconds. Numerous showers in the afternoon. .WEDNESDAY NIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Gusts up to 30 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 4 feet at 7 seconds and northeast 2 feet at 11 seconds. .THURSDAY...East winds 10 to 15 knots, diminishing to 5 to 10 knots in the afternoon. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 3 feet at 7 seconds and northeast 2 feet at 10 seconds. Numerous showers in the afternoon. .THURSDAY NIGHT...East winds 5 to 10 knots, increasing to 10 to 15 knots after midnight. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: North 2 feet at 10 seconds and south 1 foot at 6 seconds. .FRIDAY...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Scattered showers in the afternoon. .FRIDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. .SATURDAY...East winds 5 to 10 knots, becoming northeast 10 to 15 knots in the afternoon. Seas 2 to 4 feet, occasionally to 5 feet. Scattered showers in the afternoon. .SATURDAY NIGHT...East winds 15 to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Winds and seas higher in and near thunderstorms. $$ AMZ745-082015- Coastal Waters of Southwestern Puerto Rico out 10 NM- 356 AM AST Tue Sep 8 2026 .TODAY...East winds 5 to 10 knots, becoming southeast 10 to 15 knots with gusts up to 25 knots late this morning and afternoon. Seas around 2 feet. Wave Detail: East 2 feet at 5 seconds. Scattered showers with isolated thunderstorms this afternoon. .TONIGHT...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. .WEDNESDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 6 seconds and north 1 foot at 5 seconds. Scattered showers in the afternoon. .WEDNESDAY 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. Wave Detail: Southeast 3 feet at 6 seconds. .THURSDAY...East winds 10 to 15 knots, becoming southeast 15 to 20 knots in the afternoon. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 3 feet at 6 seconds and north 1 foot at 5 seconds. Scattered showers in the afternoon. .THURSDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 3 feet at 6 seconds. .FRIDAY...East winds 10 to 15 knots, becoming southeast 15 to 20 knots in the afternoon. Seas 2 to 4 feet, occasionally to 5 feet. Scattered showers in the afternoon. .FRIDAY NIGHT...East winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. Seas 2 to 4 feet, occasionally to 5 feet. .SATURDAY...East winds 5 to 10 knots. Seas 2 to 3 feet. .SATURDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. Winds and seas higher in and near thunderstorms. $$