FZCA52 TJSJ 230655 CWFSJU Coastal Waters Forecast National Weather Service San Juan PR 255 AM AST Thu Apr 23 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. AMZ700-232200- 255 AM AST Thu Apr 23 2026 .Synopsis for Puerto Rico and the U.S. Virgin Islands Waters... A frontal boundary lingering just north of the region is supporting light to gentle northeasterly winds, while pulses of a long-period northerly swell continue to spread across the Atlantic waters, resulting in hazardous seas for small craft, particularly offshore. This swell will gradually subside late in the week. As the boundary weakens, surface high pressure drifting southeastward will promote a gradual strengthening of winds, becoming moderate from the south over the weekend. Another northerly swell is expected early next week. In addition, remnant moisture from the frontal boundary may enhance shower activity over the waters, with convection capable of producing locally hazardous conditions. $$ AMZ711-232200- Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N- 255 AM AST Thu Apr 23 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS EVENING... .TODAY...East winds 5 to 10 knots. Seas 6 to 7 feet, occasionally to 9 feet. Wave Detail: North 6 feet at 10 seconds and east 2 feet at 8 seconds. Scattered showers early this morning, then isolated showers late this morning. Scattered showers this afternoon. .TONIGHT...East winds 5 to 10 knots. Seas around 6 to 7 feet, occasionally to 8 feet. Wave Detail: North 5 feet at 9 seconds and east 2 feet at 8 seconds. Scattered showers. .FRIDAY...East winds 5 to 10 knots. Seas around 5 feet, occasionally to 6 feet. Wave Detail: North 5 feet at 9 seconds and east 2 feet at 8 seconds. Scattered showers. .FRIDAY NIGHT...East winds 5 to 10 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: North 4 feet at 12 seconds and east 2 feet at 7 seconds. Scattered showers. .SATURDAY...Southeast winds 5 to 10 knots, increasing to 10 to 15 knots with gusts up to 20 knots in the afternoon. Seas around 4 feet, occasionally to 5 feet. Wave Detail: North 4 feet at 11 seconds and east 2 feet at 7 seconds. Scattered showers. .SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 3 feet at 10 seconds and south 2 feet at 4 seconds. Scattered showers in the evening. .SUNDAY...Southeast winds 5 to 10 knots. Seas around 3 feet. Scattered showers in the afternoon. .SUNDAY NIGHT...Southeast winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. .MONDAY...Southeast winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. .MONDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. $$ AMZ712-232200- Coastal Waters of Northern Puerto Rico out 10 NM- 255 AM AST Thu Apr 23 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS EVENING... .TODAY...East winds 5 to 10 knots, becoming northeast this afternoon. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: North 5 feet at 10 seconds and east 2 feet at 8 seconds. Isolated showers early this morning. Isolated showers late. .TONIGHT...East winds 5 to 10 knots. Seas 5 to 7 feet, occasionally to 8 feet. Wave Detail: North 5 feet at 9 seconds and east 2 feet at 8 seconds. .FRIDAY...East winds 5 to 10 knots. Seas around 5 feet, occasionally to 6 feet. Wave Detail: North 5 feet at 9 seconds and east 1 foot at 8 seconds. .FRIDAY NIGHT...Southeast winds 5 to 10 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: North 4 feet at 9 seconds and north 2 feet at 12 seconds. Scattered showers. .SATURDAY...Southeast winds around 5 knots, becoming northeast with gusts up to 20 knots in the afternoon. Seas around 4 feet, occasionally to 5 feet. Wave Detail: North 4 feet at 11 seconds and east 2 feet at 7 seconds. Numerous showers in the morning, then showers in the afternoon. .SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: North 4 feet at 10 seconds and east 1 foot at 7 seconds. Numerous showers in the evening. .SUNDAY...Southeast winds 5 to 10 knots, becoming east in the afternoon. Seas around 3 feet. Numerous showers in the afternoon. .SUNDAY NIGHT...East winds 5 to 10 knots, becoming southeast after midnight. Seas around 3 feet. .MONDAY...Southeast winds around 5 knots, becoming east in the afternoon. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers in the afternoon. .MONDAY NIGHT...East winds 5 to 10 knots, diminishing to around 5 knots after midnight. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers. $$ AMZ716-232200- Coastal Waters from Cabo San Juan to the waters between Anegada Island and Virgin Gorda and North 10 NM- 255 AM AST Thu Apr 23 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 5 to 10 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: North 5 feet at 10 seconds and east 2 feet at 7 seconds. Isolated showers early this morning. Isolated showers late. .TONIGHT...East winds 5 to 10 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: Northeast 5 feet at 9 seconds and north 5 feet at 10 seconds. .FRIDAY...East winds 5 to 10 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: North 5 feet at 9 seconds. .FRIDAY NIGHT...East winds around 10 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: North 4 feet at 9 seconds. Scattered showers. .SATURDAY...Southeast winds around 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 4 feet at 11 seconds. Scattered showers in the morning. .SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 4 feet at 10 seconds. .SUNDAY...Southeast winds around 10 knots. Seas 2 to 3 feet. .SUNDAY NIGHT...Southeast winds 5 to 10 knots. Seas 2 to 3 feet. .MONDAY...Southeast winds around 5 knots, increasing to 5 to 10 knots in the afternoon. Seas 2 to 3 feet. Scattered showers. .MONDAY NIGHT...Southeast winds 5 to 10 knots, becoming east after midnight. Seas 2 to 3 feet. $$ AMZ723-232200- Anegada Passage east of Virgin Gorda and Saint Croix south to 17N- 255 AM AST Thu Apr 23 2026 .TODAY...East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 2 feet at 4 seconds and east 2 feet at 8 seconds. Isolated showers late this morning and afternoon. .TONIGHT...East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: North 3 feet at 10 seconds and northeast 2 feet at 3 seconds. Scattered showers after midnight. .FRIDAY...East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: North 3 feet at 10 seconds and east 1 foot at 8 seconds. Numerous showers. .FRIDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 3 feet at 10 seconds and east 1 foot at 7 seconds. Numerous showers, mainly in the evening. .SATURDAY...Southeast winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 3 feet at 11 seconds and southeast 2 feet at 3 seconds. Scattered showers in the afternoon. .SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: Northeast 3 feet at 10 seconds. Scattered showers after midnight. .SUNDAY...Southeast winds 5 to 10 knots. Seas around 3 feet. Scattered showers in the afternoon. .SUNDAY NIGHT...Southeast winds 5 to 10 knots. Seas around 3 feet. Scattered showers. .MONDAY...Southeast winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers. .MONDAY NIGHT...East winds 5 to 10 knots, diminishing to around 5 knots after midnight. Seas 3 to 4 feet, occasionally to 5 feet. $$ AMZ726-232200- Coastal waters east of Puerto Rico, around Vieques, and around and just north of Culebra and Saint John- 255 AM AST Thu Apr 23 2026 .TODAY...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 2 feet at 4 seconds and east 2 feet at 8 seconds. Isolated showers. .TONIGHT...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 2 feet at 8 seconds. .FRIDAY...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 2 feet at 7 seconds. Scattered showers in the afternoon. .FRIDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 2 feet at 3 seconds and east 2 feet at 7 seconds. Scattered showers. .SATURDAY...Southeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 3 seconds and east 1 foot at 7 seconds. Scattered showers in the morning. .SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 4 seconds and east 1 foot at 7 seconds. .SUNDAY...Southeast winds 5 to 10 knots. Seas 2 to 3 feet. .SUNDAY NIGHT...Southeast winds 5 to 10 knots. Seas around 2 feet. Scattered showers. .MONDAY...Southeast winds around 5 knots, increasing to 5 to 10 knots in the afternoon. Seas 2 to 3 feet. Scattered showers. .MONDAY NIGHT...Southeast winds 5 to 10 knots, becoming east after midnight. Seas 2 to 3 feet. Scattered showers. $$ AMZ733-232200- Caribbean waters of Puerto Rico from 10 NM to 17N, including the coastal waters of Saint Croix- 255 AM AST Thu Apr 23 2026 .TODAY...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: East 2 feet at 4 seconds and east 2 feet at 8 seconds. Isolated showers. .TONIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: East 2 feet at 4 seconds and east 1 foot at 8 seconds. Scattered showers after midnight. .FRIDAY...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: East 2 feet at 4 seconds and east 1 foot at 8 seconds. Scattered showers. .FRIDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: East 2 feet at 4 seconds and east 1 foot at 8 seconds. Scattered showers. .SATURDAY...Southeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 4 seconds and east 1 foot at 7 seconds. .SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas around 2 feet. Wave Detail: Southeast 2 feet at 4 seconds and east 1 foot at 7 seconds. Scattered showers. .SUNDAY...Southeast winds 5 to 10 knots. Seas around 2 feet. .SUNDAY NIGHT...Southeast winds 5 to 10 knots. Seas around 2 feet. Scattered showers. .MONDAY...Southeast winds 5 to 10 knots. Seas 2 to 3 feet. Scattered showers. .MONDAY NIGHT...East winds 5 to 10 knots. Seas around 3 feet. Scattered showers. $$ AMZ735-232200- Coastal Waters of Southern Puerto Rico out 10 NM- 255 AM AST Thu Apr 23 2026 .TODAY...East winds 5 to 10 knots, becoming southeast this afternoon. Seas 2 to 3 feet. Wave Detail: East 1 foot at 6 seconds. Isolated showers late. .TONIGHT...East winds 5 to 10 knots. Seas around 2 feet. Wave Detail: East 1 foot at 4 seconds and east 1 foot at 7 seconds. Scattered showers after midnight. .FRIDAY...East winds 5 to 10 knots. Seas around 2 feet. Wave Detail: East 1 foot at 4 seconds and east 1 foot at 7 seconds. Scattered showers in the afternoon. .FRIDAY NIGHT...East winds 5 to 10 knots. Seas around 2 feet. Wave Detail: Southeast 2 feet at 4 seconds. Scattered showers. .SATURDAY...Southeast winds 5 to 10 knots. Seas around 2 feet. Wave Detail: Southeast 2 feet at 4 seconds. Scattered showers in the morning. .SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas around 2 feet. Wave Detail: Southeast 1 foot at 4 seconds. Scattered showers after midnight. .SUNDAY...Southeast winds 5 to 10 knots. Seas around 2 feet. .SUNDAY NIGHT...East winds 5 to 10 knots. Seas around 2 feet. .MONDAY...East winds 5 to 10 knots. Seas around 2 feet. Scattered showers in the afternoon. .MONDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. Scattered showers. $$ AMZ741-232200- Mona Passage Southward to 17N- 255 AM AST Thu Apr 23 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 5 to 10 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: North 3 feet at 10 seconds and northeast 2 feet at 4 seconds. Scattered showers early this morning, then isolated showers late this morning and early afternoon. .TONIGHT...East winds 5 to 10 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: North 4 feet at 9 seconds and southeast 2 feet at 4 seconds. Scattered showers in the evening. .FRIDAY...Southeast winds 5 to 10 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: North 4 feet at 9 seconds and east 2 feet at 8 seconds. Scattered showers in the morning. .FRIDAY NIGHT...Southeast winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: North 4 feet at 9 seconds and east 1 foot at 4 seconds. .SATURDAY...South winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: North 4 feet at 10 seconds and southeast 2 feet at 4 seconds. .SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: North 3 feet at 11 seconds and southeast 2 feet at 4 seconds. .SUNDAY...Southeast winds around 10 knots. Seas 2 to 3 feet. .SUNDAY NIGHT...Southeast winds 5 to 10 knots. Seas 2 to 3 feet. .MONDAY...Southeast winds 5 to 10 knots. Seas 2 to 3 feet. Scattered showers in the afternoon. .MONDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers. $$ AMZ742-232200- Coastal Waters of Northwestern Puerto Rico out 10 NM- 255 AM AST Thu Apr 23 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds around 5 knots, becoming northwest early this afternoon, then becoming north late. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: North 5 feet at 10 seconds and northeast 2 feet at 10 seconds. Isolated showers this afternoon. .TONIGHT...Northeast winds 5 to 10 knots, becoming east after midnight. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: North 5 feet at 10 seconds. Scattered showers in the evening. .FRIDAY...East winds around 5 knots, becoming north in the afternoon. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: North 5 feet at 9 seconds. Scattered showers in the afternoon. .FRIDAY NIGHT...East winds 5 to 10 knots, becoming southeast after midnight. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: North 4 feet at 9 seconds. Scattered showers in the evening. .SATURDAY...Southeast winds 5 to 10 knots, becoming south 10 to 15 knots in the afternoon. Gusts up to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: North 4 feet at 10 seconds and south 3 feet at 4 seconds. Scattered showers in the afternoon. .SATURDAY NIGHT...Southeast winds 10 to 15 knots with gusts up to 20 knots, diminishing to 5 to 10 knots after midnight. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: North 4 feet at 11 seconds and south 2 feet at 4 seconds. .SUNDAY...Southeast winds 5 to 10 knots, becoming south 10 to 15 knots in the afternoon. Seas 2 to 3 feet. .SUNDAY NIGHT...Southeast winds 5 to 10 knots. Seas 2 to 3 feet. .MONDAY...East winds around 5 knots. Seas 2 to 3 feet. Scattered showers in the afternoon. .MONDAY NIGHT...East winds around 5knots. Seas 2 to 3 feet. $$ AMZ745-232200- Coastal Waters of Southwestern Puerto Rico out 10 NM- 255 AM AST Thu Apr 23 2026 .TODAY...Southeast winds around 5 knots, becoming east. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northwest 3 feet at 9 seconds and east 1 foot at 4 seconds. Isolated showers this afternoon. .TONIGHT...East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northwest 4 feet at 9 seconds. Scattered showers in the evening. .FRIDAY...Southeast winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: North 3 feet at 9 seconds. Scattered showers in the afternoon. .FRIDAY NIGHT...East winds around 5 knots, becoming southeast after midnight. Seas 2 to 3 feet. Wave Detail: North 3 feet at 9 seconds. .SATURDAY...Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 3 seconds and north 2 feet at 9 seconds. Scattered showers in the morning. .SATURDAY NIGHT...Southeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: South 2 feet at 3 seconds and northwest 2 feet at 10 seconds. .SUNDAY...Southeast winds 10 to 15 knots. Seas around 2 feet. .SUNDAY NIGHT...East winds 5 to 10 knots. Seas around 2 feet. .MONDAY...Southeast winds 5 to 10 knots. Seas around 2 feet. Scattered showers in the afternoon. .MONDAY NIGHT...East winds 5 to 10 knots. Seas around 2 feet. $$