FZCA52 TJSJ 160738 CWFSJU Coastal Waters Forecast National Weather Service San Juan PR 338 AM AST Thu Apr 16 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. AMZ700-162030- 338 AM AST Thu Apr 16 2026 .Synopsis for Puerto Rico and the U.S. Virgin Islands Waters... A surface high pressure system over the eastern to central Atlantic, interacting with surface trough north of the region, will promote east-southeast light to moderate winds. A subsiding northerly swell will continue to spread across the Atlantic waters, maintaining seas from 5 to 6 feet across exposed areas, small craft should exercise caution. Showers and thunderstorms associated to the trough will continue across the local waters, creating locally hazardous marine conditions through the weekend. Model guidance suggests another long- period northerly swell that may arrive and spread across local waters and passages by next week, resulting in choppy to rough seas and becoming hazardous for small craft. $$ AMZ711-162030- Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N- 338 AM AST Thu Apr 16 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 9 seconds and north 3 feet at 12 seconds. Numerous showers with isolated thunderstorms this morning, then scattered showers this afternoon. Scattered thunderstorms late. .TONIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 8 seconds and north 3 feet at 11 seconds. Scattered showers. .FRIDAY...East winds around 15 knots with gusts up to 25 knots. Seas around 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 8 seconds and northeast 1 foot at 14 seconds. Scattered showers. .FRIDAY NIGHT...East winds around 15 knots with gusts up to 25 knots. Seas around 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 8 seconds and northeast 1 foot at 13 seconds. Scattered showers in the evening, then numerous showers after midnight. .SATURDAY...East winds around 15 knots with gusts up to 25 knots. Seas around 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 8 seconds and northeast 1 foot at 13 seconds. Scattered showers in the morning. .SATURDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 8 seconds and northeast 2 feet at 13 seconds. Scattered showers. .SUNDAY...East winds around 15 knots. Seas 5 to 6 feet, occasionally to 8 feet. .SUNDAY NIGHT...East winds around 15 knots. Seas around 5 feet, occasionally to 6 feet. .MONDAY...East winds 10 to 15 knots. Seas around 5 feet, occasionally to 6 feet. .MONDAY NIGHT...East winds around 15 knots. Seas around 5 feet, occasionally to 6 feet. Winds and seas higher in and near thunderstorms. $$ AMZ712-162030- Coastal Waters of Northern Puerto Rico out 10 NM- 338 AM AST Thu Apr 16 2026 .TODAY...East winds 5 to 10 knots, increasing to 10 to 15 knots with gusts up to 25 knots late this morning and afternoon. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 5 feet at 9 seconds and north 1 foot at 14 seconds. Scattered showers with isolated thunderstorms until late afternoon, then showers and scattered thunderstorms late. .TONIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 5 feet at 9 seconds and north 2 feet at 11 seconds. Numerous showers. .FRIDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 4 feet at 8 seconds and north 1 foot at 11 seconds. Numerous showers, mainly in the morning. .FRIDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 4 feet at 8 seconds and northeast 1 foot at 14 seconds. Numerous showers, mainly in the evening. .SATURDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 4 feet at 8 seconds and northeast 1 foot at 12 seconds. Scattered showers in the morning. .SATURDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 4 feet at 8 seconds and northeast 2 feet at 12 seconds. Scattered showers. .SUNDAY...East winds 10 to 15 knots. Seas 4 to 5 feet, occasionally to 6 feet. .SUNDAY NIGHT...East winds 10 to 15 knots. Seas 4 to 5 feet, occasionally to 6 feet. .MONDAY...East winds 10 to 15 knots. Seas around 4 feet, occasionally to 5 feet. Scattered showers in the afternoon. .MONDAY NIGHT...East winds 10 to 15 knots. Seas 4 to 5 feet, occasionally to 6 feet. Winds and seas higher in and near thunderstorms. $$ AMZ716-162030- Coastal Waters from Cabo San Juan to the waters between Anegada Island and Virgin Gorda and North 10 NM- 338 AM AST Thu Apr 16 2026 .TODAY...East winds around 15 knots with gusts up to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 4 feet at 9 seconds and east 3 feet at 4 seconds. Numerous showers with isolated thunderstorms this morning, then scattered showers this afternoon. .TONIGHT...East winds around 15 knots with gusts up to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 4 feet at 9 seconds and east 3 feet at 5 seconds. Scattered showers in the evening, then numerous showers after midnight. .FRIDAY...East winds around 15 knots with gusts up to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: Northeast 4 feet at 8 seconds and east 3 feet at 5 seconds. Scattered showers in the morning, then numerous showers in the afternoon. .FRIDAY NIGHT...East winds around 15 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 4 feet at 8 seconds and southeast 2 feet at 5 seconds. Numerous showers. .SATURDAY...East winds around 15 knots with gusts up to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 4 feet at 8 seconds and southeast 2 feet at 4 seconds. Scattered showers in the morning. .SATURDAY NIGHT...East winds around 15 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 4 feet at 8 seconds and southeast 2 feet at 4 seconds. Scattered showers in the evening, then numerous showers after midnight. .SUNDAY...East winds around 15 knots. Seas 3 to 5 feet, occasionally to 6 feet. .SUNDAY NIGHT...East winds around 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. .MONDAY...East winds around 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers in the afternoon. .MONDAY NIGHT...East winds around 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Winds and seas higher in and near thunderstorms. $$ AMZ723-162030- Anegada Passage east of Virgin Gorda and Saint Croix south to 17N- 338 AM AST Thu Apr 16 2026 .TODAY...East winds around 15 knots with gusts up to 25 knots. Seas around 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 5 seconds and northeast 4 feet at 9 seconds. Numerous showers early this morning. Isolated thunderstorms this morning. Scattered showers late this morning and afternoon. .TONIGHT...East winds around 15 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 northeast 4 feet at 9 seconds. Scattered showers. .FRIDAY...East winds around 15 knots with gusts up to 25 knots. Seas around 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 7 seconds and northeast 2 feet at 11 seconds. Scattered showers. .FRIDAY NIGHT...East winds around 15 knots with gusts up to 25 knots. Seas around 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 7 seconds and northeast 1 foot at 13 seconds. Numerous showers, mainly in the evening. .SATURDAY...East winds around 15 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 7 seconds and northeast 1 foot at 12 seconds. Numerous showers in the morning. .SATURDAY NIGHT...East winds around 15 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 8 seconds and east 4 feet at 5 seconds. Scattered showers. .SUNDAY...East winds around 15 knots. Seas 4 to 5 feet, occasionally to 6 feet. .SUNDAY NIGHT...East winds around 15 knots. Seas 4 to 5 feet, occasionally to 6 feet. .MONDAY...East winds around 15 knots. Seas 4 to 5 feet, occasionally to 6 feet. .MONDAY NIGHT...East winds around 15 knots. Seas 4 to 5 feet, occasionally to 6 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ726-162030- Coastal waters east of Puerto Rico, around Vieques, and around and just north of Culebra and Saint John- 338 AM AST Thu Apr 16 2026 .TODAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 3 feet at 5 seconds and east 3 feet at 9 seconds. Isolated thunderstorms. .TONIGHT...East winds around 15 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds. Scattered showers in the evening, then numerous showers after midnight. .FRIDAY...East winds around 15 knots with gusts up to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 7 seconds. Scattered showers in the morning, then numerous showers in the afternoon. .FRIDAY NIGHT...East winds around 15 knots with gusts up to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds. Numerous showers. .SATURDAY...East winds around 15 knots with gusts up to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds. Scattered showers. .SATURDAY NIGHT...East winds around 15 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds. Scattered showers in the evening, then numerous showers after midnight. .SUNDAY...East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. .SUNDAY NIGHT...East winds around 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. .MONDAY...East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers. .MONDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ733-162030- Caribbean waters of Puerto Rico from 10 NM to 17N, including the coastal waters of Saint Croix- 338 AM AST Thu Apr 16 2026 .TODAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 6 seconds and northeast 2 feet at 9 seconds. Numerous showers with isolated thunderstorms this morning, then isolated showers early this afternoon. Scattered showers late. .TONIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 6 seconds and northeast 2 feet at 9 seconds. Numerous showers, mainly in the evening. .FRIDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 7 seconds. Scattered showers in the morning, then numerous showers in the afternoon. .FRIDAY NIGHT...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 7 seconds. Numerous showers, mainly in the evening. .SATURDAY...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 7 seconds. Scattered showers. .SATURDAY NIGHT...East winds around 15 knots with gusts up to 25 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 7 seconds. Scattered showers. .SUNDAY...East winds 10 to 15 knots. Seas around 4 feet, occasionally to 5 feet. .SUNDAY NIGHT...East winds around 15 knots. Seas around 4 feet, occasionally to 5 feet. .MONDAY...East winds 10 to 15 knots. Seas around 4 feet, occasionally to 5 feet. Scattered showers in the afternoon. .MONDAY NIGHT...East winds around 15 knots. Seas around 4 feet, occasionally to 5 feet. Scattered showers. Winds and seas higher in and near thunderstorms. $$ AMZ735-162030- Coastal Waters of Southern Puerto Rico out 10 NM- 338 AM AST Thu Apr 16 2026 .TODAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 3 feet at 5 seconds and east 1 foot at 9 seconds. Numerous showers with isolated thunderstorms early this morning, then scattered showers late this morning. Isolated showers this afternoon. .TONIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 3 feet at 6 seconds. Numerous showers, mainly in the evening. .FRIDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Southeast 3 feet at 6 seconds. Scattered showers. .FRIDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 6 seconds. .SATURDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 6 seconds. Scattered showers. .SATURDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 6 seconds. .SUNDAY...East winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. .SUNDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Scattered showers. .MONDAY...East winds 10 to 15 knots. Seas 2 to 3 feet. Scattered showers in the afternoon. .MONDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet. Winds and seas higher in and near thunderstorms. $$ AMZ741-162030- Mona Passage Southward to 17N- 338 AM AST Thu Apr 16 2026 .TODAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: North 4 feet at 9 seconds and southeast 3 feet at 6 seconds. Isolated showers. .TONIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: Southeast 3 feet at 6 seconds and north 3 feet at 10 seconds. .FRIDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: Southeast 3 feet at 6 seconds and northeast 3 feet at 10 seconds. Scattered showers. .FRIDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: Southeast 4 feet at 6 seconds and northeast 3 feet at 9 seconds. Scattered showers in the evening. .SATURDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds and northeast 1 foot at 12 seconds. .SATURDAY NIGHT...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 and northeast 1 foot at 12 seconds. Scattered showers in the evening. .SUNDAY...East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers in the afternoon. .SUNDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers. .MONDAY...East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. .MONDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers. $$ AMZ742-162030- Coastal Waters of Northwestern Puerto Rico out 10 NM- 338 AM AST Thu Apr 16 2026 .TODAY...East winds around 5 knots, becoming northeast late. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: North 4 feet at 9 seconds. Isolated showers this morning, then numerous showers with isolated thunderstorms this afternoon. .TONIGHT...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: North 4 feet at 9 seconds and south 1 foot at 4 seconds. Scattered showers in the evening. .FRIDAY...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 3 feet at 8 seconds and south 1 foot at 6 seconds. Showers and scattered thunderstorms in the afternoon. .FRIDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 3 feet at 9 seconds and south 1 foot at 6 seconds. Scattered showers in the evening. .SATURDAY...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 3 feet at 8 seconds and south 1 foot at 7 seconds. Scattered showers in the afternoon. .SATURDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 3 feet at 7 seconds and south 1 foot at 6 seconds. Scattered showers in the evening. .SUNDAY...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Scattered showers in the afternoon. .SUNDAY NIGHT...East winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. Seas 2 to 4 feet, occasionally to 5 feet. Scattered showers. .MONDAY...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Numerous showers in the afternoon. .MONDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Winds and seas higher in and near thunderstorms. $$ AMZ745-162030- Coastal Waters of Southwestern Puerto Rico out 10 NM- 338 AM AST Thu Apr 16 2026 .TODAY...East winds 5 to 10 knots, increasing to 10 to 15 knots with gusts up to 25 knots late this morning and afternoon. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 5 seconds and north 2 feet at 9 seconds. Isolated showers. .TONIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 5 seconds and north 2 feet at 8 seconds. .FRIDAY...East winds 10 to 15 knots, diminishing to 5 to 10 knots in the afternoon. Seas 2 to 3 feet. Wave Detail: East 2 feet at 5 seconds and north 2 feet at 8 seconds. Scattered showers in the afternoon. .FRIDAY NIGHT...East winds 5 to 10 knots with gusts up to 20 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 6 seconds and north 1 foot at 8 seconds. Scattered showers in the evening. .SATURDAY...East winds 5 to 10 knots, increasing to 10 to 15 knots with gusts up to 20 knots in the afternoon. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 6 seconds and north 1 foot at 7 seconds. Scattered showers in the afternoon. .SATURDAY NIGHT...East winds 5 to 10 knots. Seas around 2 feet. Wave Detail: Southeast 2 feet at 6 seconds and north 1 foot at 7 seconds. Scattered showers in the evening. .SUNDAY...East winds around 5 knots. Seas around 2 feet. Scattered showers in the afternoon. .SUNDAY NIGHT...East winds around 5 knots. Seas around 2 feet. Scattered showers. .MONDAY...East winds around 5 knots. Seas around 2 feet. Scattered showers in the afternoon. .MONDAY NIGHT...East winds around 5 knots. Seas around 2 feet. Scattered showers. $$