Coastal Waters Forecast
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
161 FZCA52 TJSJ 110740 CWFSJU Coastal Waters Forecast National Weather Service San Juan PR 340 AM AST Tue Aug 11 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. AMZ700-112200- 340 AM AST Tue Aug 11 2026 .Synopsis for Puerto Rico and the U.S. Virgin Islands Waters... The broad Atlantic ridge extending from the western into the central Atlantic will continue to promote moderate easterly winds across the local waters today. A tropical wave crossing the eastern Caribbean will increase shower and thunderstorm activity, with locally higher winds and seas possible near stronger convection. Marine conditions will deteriorate toward the end of the workweek as the local pressure gradient tightens and easterly winds strengthen. Fresh to locally strong winds and increasingly rough seas are expected across portions of the offshore waters and local passages, resulting in hazardous conditions for small craft. Small Craft Advisories will likely be required for some of these waters. Pulses of Saharan dust will also persist through the week, occasionally reducing visibility. $$ AMZ711-112200- Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N- 340 AM AST Tue Aug 11 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas around 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 6 seconds and northeast 1 foot at 9 seconds. Isolated showers early this morning, then scattered showers late this morning and afternoon. .TONIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 5 feet at 7 seconds. Scattered showers. .WEDNESDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Gusts up to 30 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 6 seconds. Scattered showers in the morning. .WEDNESDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 5 feet at 7 seconds. .THURSDAY...East winds 15 to 20 knots with gusts up to 35 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 7 seconds and northeast 1 foot at 8 seconds. .THURSDAY NIGHT...East winds 15 to 20 knots with gusts up to 35 knots. Seas 6 to 7 feet, occasionally to 9 feet. Wave Detail: East 7 feet at 7 seconds and north 1 foot at 12 seconds. .FRIDAY...East winds 15 to 20 knots. Seas around 7 feet, occasionally to 9 feet. .FRIDAY NIGHT...East winds 15 to 20 knots. Seas 6 to 7 feet, occasionally to 9 feet. .SATURDAY...East winds 15 to 20 knots. Seas 6 to 7 feet, occasionally to 9 feet. .SATURDAY NIGHT...East winds 15 to 20 knots. Seas 6 to 7 feet, occasionally to 9 feet. $$ AMZ712-112200- Coastal Waters of Northern Puerto Rico out 10 NM- 340 AM AST Tue Aug 11 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 10 to 15 knots, increasing to 15 to 20 knots this afternoon. Gusts up to 30 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 5 feet at 6 seconds and northeast 1 foot at 9 seconds. Isolated showers until late afternoon, then scattered showers with isolated thunderstorms late. .TONIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas around 4 feet, occasionally to 5 feet. Wave Detail: Northeast 4 feet at 6 seconds. Scattered showers. .WEDNESDAY...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 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 4 feet at 7 seconds. Scattered 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. Scattered showers in the evening. .THURSDAY...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. .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 7 seconds. .FRIDAY...East winds 15 to 20 knots, increasing to 20 to 25 knots in the afternoon. Seas 5 to 7 feet, occasionally to 9 feet. .FRIDAY NIGHT...East winds 15 to 20 knots. Seas 5 to 7 feet, occasionally to 9 feet. .SATURDAY...East winds 15 to 20 knots. Seas 5 to 7 feet, occasionally to 9 feet. .SATURDAY NIGHT...East winds 15 to 20 knots. Seas 5 to 7 feet, occasionally to 9 feet. Winds and seas higher in and near thunderstorms. $$ AMZ716-112200- Coastal Waters from Cabo San Juan to the waters between Anegada Island and Virgin Gorda and North 10 NM- 340 AM AST Tue Aug 11 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 6 seconds and northeast 1 foot at 9 seconds. Isolated showers early this morning, then scattered showers late this morning and afternoon. Isolated thunderstorms late. .TONIGHT...East winds around 15 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 3 feet at 7 seconds. Scattered showers in the evening. .WEDNESDAY...East winds around 15 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 6 seconds. Scattered showers. .WEDNESDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 5 seconds and northeast 1 foot at 8 seconds. .THURSDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 5 seconds and northeast 1 foot at 8 seconds. .THURSDAY NIGHT...East winds 20 to 25 knots with gusts up to 35 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 6 seconds. .FRIDAY...East winds 20 to 25 knots, diminishing to 15 to 20 knots in the afternoon. Seas 4 to 6 feet, occasionally to 8 feet. .FRIDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. .SATURDAY...East winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. .SATURDAY NIGHT...Northeast winds 15 to 20 knots. Seas 4 to 6 feet, occasionally to 8 feet. Winds and seas higher in and near thunderstorms. $$ AMZ723-112200- Anegada Passage east of Virgin Gorda and Saint Croix south to 17N- 340 AM AST Tue Aug 11 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 15 to 20 knots with gusts up to 25 knots, diminishing to 10 to 15 knots with gusts up to 25 knots late. Seas around 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 6 seconds and northeast 1 foot at 9 seconds. Scattered showers early this morning, then isolated showers late this morning and early afternoon. Scattered showers late. .TONIGHT...East winds around 15 knots with gusts up to 25 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 6 seconds and northeast 1 foot at 9 seconds. .WEDNESDAY...East winds around 15 knots with gusts up to 25 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: Northeast 4 feet at 7 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 5 feet at 6 seconds and northeast 1 foot at 9 seconds. .THURSDAY...East winds 20 to 25 knots with gusts up to 30 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: Northeast 6 feet at 7 seconds. .THURSDAY 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. .FRIDAY...East winds 20 to 25 knots, diminishing to 15 to 20 knots in the afternoon. Seas 7 to 8 feet, occasionally to 10 feet. .FRIDAY NIGHT...East winds 15 to 20 knots. Seas 6 to 7 feet, occasionally to 9 feet. .SATURDAY...East winds 15 to 20 knots. Seas 6 to 7 feet, occasionally to 9 feet. .SATURDAY NIGHT...Northeast winds 15 to 20 knots. Seas around 6 feet, occasionally to 8 feet. $$ AMZ726-112200- Coastal waters east of Puerto Rico, around Vieques, and around and just north of Culebra and Saint John- 340 AM AST Tue Aug 11 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 6 seconds. Scattered showers. Isolated thunderstorms late. .TONIGHT...East winds around 15 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 6 seconds. Scattered showers in the evening. .WEDNESDAY...East winds around 15 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 4 feet at 6 seconds. Scattered showers in the afternoon. .WEDNESDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 4 feet at 6 seconds. .THURSDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: Southeast 5 feet at 6 seconds. .THURSDAY NIGHT...East winds 20 to 25 knots with gusts up to 35 knots. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: Southeast 6 feet at 7 seconds. .FRIDAY...East winds 20 to 25 knots. Seas 5 to 7 feet, occasionally to 9 feet. .FRIDAY NIGHT...East winds 15 to 20 knots, increasing to 20 to 25 knots after midnight. Seas 5 to 6 feet, occasionally to 8 feet. .SATURDAY...East winds 15 to 20 knots. Seas 5 to 6 feet, occasionally to 8 feet. .SATURDAY NIGHT...Northeast winds 15 to 20 knots. Seas 5 to 6 feet, occasionally to 8 feet. Winds and seas higher in and near thunderstorms. $$ AMZ733-112200- Caribbean waters of Puerto Rico from 10 NM to 17N, including the coastal waters of Saint Croix- 340 AM AST Tue Aug 11 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 15 to 20 knots, diminishing to 10 to 15 knots late. Gusts up to 30 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 6 seconds. Isolated showers early this morning, then scattered showers late this morning and afternoon. Isolated thunderstorms late. .TONIGHT...East winds 10 to 15 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. .WEDNESDAY...East winds around 15 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 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 5 feet at 6 seconds. .THURSDAY...East winds 20 to 25 knots with gusts up to 30 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 6 seconds. .THURSDAY 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. .FRIDAY...East winds 20 to 25 knots. Seas 7 to 8 feet, occasionally to 10 feet. .FRIDAY NIGHT...East winds around 20 knots. Seas 6 to 8 feet, occasionally to 10 feet. .SATURDAY...East winds 15 to 20 knots. Seas 6 to 8 feet, occasionally to 10 feet. .SATURDAY NIGHT...Northeast winds 15 to 20 knots. Seas 6 to 7 feet, occasionally to 9 feet. Winds and seas higher in and near thunderstorms. $$ AMZ735-112200- Coastal Waters of Southern Puerto Rico out 10 NM- 340 AM AST Tue Aug 11 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 10 to 15 knots, increasing to 15 to 20 knots this afternoon. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 6 seconds. Isolated showers until late afternoon, then scattered showers with isolated thunderstorms late. .TONIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 6 seconds. Scattered showers. .WEDNESDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 5 seconds. .WEDNESDAY NIGHT...East winds 10 to 15 knots, increasing to 15 to 20 knots after midnight. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 6 seconds. Scattered showers in the evening. .THURSDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 6 seconds. .THURSDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 7 seconds. .FRIDAY...East winds 20 to 25 knots. Seas 5 to 7 feet, occasionally to 9 feet. .FRIDAY NIGHT...East winds 15 to 20 knots. Seas 5 to 7 feet, occasionally to 9 feet. .SATURDAY...East winds 15 to 20 knots. Seas 5 to 7 feet, occasionally to 9 feet. .SATURDAY NIGHT...Northeast winds 15 to 20 knots. Seas 5 to 6 feet, occasionally to 8 feet. Winds and seas higher in and near thunderstorms. $$ AMZ741-112200- Mona Passage Southward to 17N- 340 AM AST Tue Aug 11 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 15 to 20 knots, diminishing to 10 to 15 knots late this morning and afternoon. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 6 seconds. Isolated showers until late afternoon, then scattered showers with isolated thunderstorms late. .TONIGHT...East winds 10 to 15 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. .WEDNESDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds. Scattered showers in the morning. .WEDNESDAY 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 after midnight. .THURSDAY...East winds 15 to 20 knots, increasing to 20 to 25 knots in the afternoon. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: Southeast 6 feet at 6 seconds. .THURSDAY NIGHT...East winds 15 to 20 knots, increasing to 20 to 25 knots after midnight. Gusts up to 35 knots. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: East 7 feet at 7 seconds. .FRIDAY...East winds 20 to 25 knots. Seas 6 to 9 feet, occasionally to 11 feet. .FRIDAY NIGHT...East winds 20 to 25 knots, diminishing to 15 to 20 knots after midnight. Seas 6 to 9 feet, occasionally to 11 feet. .SATURDAY...East winds 15 to 20 knots. Seas 6 to 8 feet, occasionally to 10 feet. .SATURDAY NIGHT...Northeast winds 15 to 20 knots. Seas 6 to 8 feet, occasionally to 10 feet. Winds and seas higher in and near thunderstorms. $$ AMZ742-112200- Coastal Waters of Northwestern Puerto Rico out 10 NM- 340 AM AST Tue Aug 11 2026 .TODAY...Northeast winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 3 feet at 6 seconds and south 1 foot at 5 seconds. Showers with isolated thunderstorms this afternoon. .TONIGHT...East winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. Seas 2 to 3 feet. Wave Detail: Northeast 3 feet at 6 seconds and south 1 foot at 5 seconds. Numerous showers in the evening. .WEDNESDAY...East winds around 5 knots, increasing to 5 to 10 knots in the afternoon. Seas 2 to 3 feet. Wave Detail: Northeast 3 feet at 5 seconds and south 1 foot at 5 seconds. Scattered showers in the afternoon. .WEDNESDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: South 1 foot at 5 seconds. Scattered showers in the evening. .THURSDAY...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: South 1 foot at 6 seconds. Scattered showers in the afternoon. .THURSDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 3 feet at 3 seconds and south 2 feet at 6 seconds. .FRIDAY...East winds 10 to 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Scattered showers in the afternoon. .FRIDAY NIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 3 to 5 feet, occasionally to 6 feet. .SATURDAY...East winds 10 to 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. Scattered showers in the afternoon. .SATURDAY NIGHT...Northeast winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 4 to 6 feet, occasionally to 8 feet. Winds and seas higher in and near thunderstorms. $$ AMZ745-112200- Coastal Waters of Southwestern Puerto Rico out 10 NM- 340 AM AST Tue Aug 11 2026 .TODAY...Northeast winds 5 to 10 knots with gusts up to 20 knots, becoming southeast late this morning, then increasing to 10 to 15 knots with gusts up to 20 knots early this afternoon, becoming east 5 to 10 knots with gusts up to 20 knots late. Seas around 2 feet. Wave Detail: South 1 foot at 5 seconds. Scattered showers with isolated thunderstorms early this afternoon. Numerous showers with isolated thunderstorms late. .TONIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 5 seconds and north 1 foot at 5 seconds. Scattered showers in the evening. .WEDNESDAY...Southeast winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 5 seconds and north 1 foot at 5 seconds. .WEDNESDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 5 seconds and north 1 foot at 5 seconds. .THURSDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 5 seconds. .THURSDAY NIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Gusts up to 30 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 3 feet at 5 seconds. .FRIDAY...East winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. .FRIDAY NIGHT...East winds 15 to 20 knots, diminishing to 5 to 10 knots after midnight. Seas 3 to 5 feet, occasionally to 6 feet. .SATURDAY...East winds 5 to 10 knots, increasing to 10 to 15 knots in the afternoon. Seas 2 to 4 feet, occasionally to 5 feet. Scattered showers in the afternoon. .SATURDAY NIGHT...Northeast winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Winds and seas higher in and near thunderstorms. $$