FZCA52 TJSJ 200752 CWFSJU Coastal Waters Forecast National Weather Service San Juan PR 352 AM AST Mon Apr 20 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. AMZ700-202015- 352 AM AST Mon Apr 20 2026 .Synopsis for Puerto Rico and the U.S. Virgin Islands Waters... A surface high positioned over the Atlantic is currently generating moderate to locally fresh easterly winds, particularly affecting the offshore Atlantic waters and the local Caribbean passages. This is resulting in moderate to choppy sea conditions. Small Craft Operators Should Exercise Caution in these aforementioned areas. Sea states are anticipated to diminish slightly around Tuesday, subsequently increasing to 6 to 7 feet from mid-week onward, owing to a northerly swell propagating across the Atlantic waters. A series of frontal lows and surface highs will result in winds veering and backing during the week, with more ENE winds by midweek and more ESE winds by the end of the workweek. $$ AMZ711-202015- Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N- 352 AM AST Mon Apr 20 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 15 to 20 knots, diminishing to 10 to 15 knots this afternoon. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 8 seconds and northeast 2 feet at 12 seconds. Isolated showers. .TONIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas around 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 8 seconds and northeast 2 feet at 11 seconds. .TUESDAY...East winds 10 to 15 knots with gusts up to 20 knots, diminishing to 5 to 10 knots in the afternoon. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 8 seconds and northeast 1 foot at 11 seconds. .TUESDAY NIGHT...Northeast winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 8 seconds and northeast 1 foot at 11 seconds. .WEDNESDAY...Northeast winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 8 seconds and northwest 2 feet at 11 seconds. .WEDNESDAY NIGHT...Northeast winds around 10 knots. Seas 3 to 5 feet, occasionally to 6 feet, building to 5 to 6 feet, occasionally to 8 feet after midnight. Wave Detail: North 4 feet at 10 seconds and east 3 feet at 8 seconds, becoming north 6 feet at 10 seconds and east 3 feet at 8 seconds. .THURSDAY...Northeast winds 5 to 10 knots. Seas around 6 feet, occasionally to 8 feet. .THURSDAY NIGHT...East winds 5 to 10 knots. Seas 5 to 6 feet, occasionally to 8 feet. .FRIDAY...East winds 5 to 10 knots. Seas around 5 feet, occasionally to 6 feet. Scattered showers in the afternoon. .FRIDAY NIGHT...East winds 5 to 10 knots. Seas 4 to 5 feet, occasionally to 6 feet. Scattered showers. $$ AMZ712-202015- Coastal Waters of Northern Puerto Rico out 10 NM- 352 AM AST Mon Apr 20 2026 .TODAY...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. Isolated showers until late afternoon, then scattered showers late. .TONIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 8 seconds and northeast 2 feet at 11 seconds. .TUESDAY...East winds 10 to 15 knots. Seas around 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 8 seconds and northeast 2 feet at 11 seconds. .TUESDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 8 seconds and northeast 1 foot at 11 seconds. Scattered showers after midnight. .WEDNESDAY...Northeast winds 5 to 10 knots. Seas around 3 feet. Wave Detail: East 3 feet at 8 seconds and northeast 1 foot at 10 seconds. .WEDNESDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: North 5 feet at 10 seconds and northeast 3 feet at 8 seconds. .THURSDAY...East winds 5 to 10 knots. Seas 5 to 6 feet, occasionally to 8 feet. .THURSDAY NIGHT...East winds 5 to 10 knots. Seas 5 to 6 feet, occasionally to 8 feet. Scattered showers. .FRIDAY...East winds 5 to 10 knots. Seas 4 to 5 feet, occasionally to 6 feet. Numerous showers in the afternoon. .FRIDAY NIGHT...East winds 5 to 10 knots. Seas 4 to 5 feet, occasionally to 6 feet. $$ AMZ716-202015- Coastal Waters from Cabo San Juan to the waters between Anegada Island and Virgin Gorda and North 10 NM- 352 AM AST Mon Apr 20 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 15 to 20 knots, diminishing to 10 to 15 knots late. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 6 seconds and northeast 2 feet at 12 seconds. Isolated showers. .TONIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds and northeast 2 feet at 11 seconds. .TUESDAY...East winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 8 seconds and northeast 1 foot at 11 seconds. .TUESDAY NIGHT...Northeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 7 seconds and northeast 1 foot at 11 seconds. Scattered showers after midnight. .WEDNESDAY...Northeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: East 2 feet at 7 seconds and northeast 1 foot at 10 seconds. Scattered showers in the morning. .WEDNESDAY NIGHT...Northeast winds around 10 knots. Seas 2 to 3 feet. Wave Detail: Northeast 2 feet at 7 seconds and northwest 2 feet at 11 seconds. .THURSDAY...East winds 5 to 10 knots. Seas 3 to 5 feet, occasionally to 6 feet. Scattered showers in the morning. .THURSDAY NIGHT...East winds 5 to 10 knots. Seas 4 to 6 feet, occasionally to 8 feet. .FRIDAY...East winds 5 to 10 knots. Seas 3 to 5 feet, occasionally to 6 feet. Scattered showers in the afternoon. .FRIDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 5 feet, occasionally to 6 feet. $$ AMZ723-202015- Anegada Passage east of Virgin Gorda and Saint Croix south to 17N- 352 AM AST Mon Apr 20 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 7 seconds and northeast 1 foot at 12 seconds. Isolated showers. .TONIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds and northeast 1 foot at 11 seconds. .TUESDAY...East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds and northeast 1 foot at 11 seconds. .TUESDAY NIGHT...Northeast winds 10 to 15 knots with gusts up to 20 knots. Seas around 3 feet. Wave Detail: Northeast 3 feet at 7 seconds and northeast 1 foot at 11 seconds. .WEDNESDAY...Northeast winds around 10 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 7 seconds and northeast 1 foot at 10 seconds. .WEDNESDAY NIGHT...Northeast winds around 10 knots. Seas 2 to 3 feet. Wave Detail: Northeast 3 feet at 5 seconds and northeast 1 foot at 11 seconds. .THURSDAY...East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers in the morning. .THURSDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. .FRIDAY...East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. .FRIDAY NIGHT...East winds around 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. $$ AMZ726-202015- Coastal waters east of Puerto Rico, around Vieques, and around and just north of Culebra and Saint John- 352 AM AST Mon Apr 20 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 15 to 20 knots, diminishing to 10 to 15 knots late. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 6 seconds. Isolated showers. .TONIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds. .TUESDAY...East winds 10 to 15 knots with gusts up to 20 knots, diminishing to 5 to 10 knots in the afternoon. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds. .TUESDAY NIGHT...Northeast winds around 10 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 7 seconds. Scattered showers after midnight. .WEDNESDAY...Northeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 7 seconds. Scattered showers in the morning. .WEDNESDAY NIGHT...Northeast winds around 10 knots. Seas 2 to 3 feet. Wave Detail: Northeast 2 feet at 7 seconds. .THURSDAY...East winds 5 to 10 knots. Seas 2 to 3 feet. Scattered showers. .THURSDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. .FRIDAY...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Scattered showers in the afternoon. .FRIDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. $$ AMZ733-202015- Caribbean waters of Puerto Rico from 10 NM to 17N, including the coastal waters of Saint Croix- 352 AM AST Mon Apr 20 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...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. Scattered showers, mainly this morning. .TONIGHT...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. .TUESDAY...East winds 10 to 15 knots with gusts up to 20 knots, diminishing to 5 to 10 knots in the afternoon. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds. .TUESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas around 3 feet. Wave Detail: East 3 feet at 7 seconds. .WEDNESDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 7 seconds. Scattered showers in the morning. .WEDNESDAY NIGHT...Northeast winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 8 seconds. .THURSDAY...East winds 5 to 10 knots. Seas 2 to 3 feet. .THURSDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. .FRIDAY...East winds 5 to 10 knots. Seas 2 to 3 feet. Scattered showers in the afternoon. .FRIDAY NIGHT...East winds around 10 knots. Seas 2 to 3 feet. Scattered showers. $$ AMZ735-202015- Coastal Waters of Southern Puerto Rico out 10 NM- 352 AM AST Mon Apr 20 2026 .TODAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 6 seconds. Scattered showers early this morning, then isolated showers late this morning and afternoon. .TONIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds. Scattered showers after midnight. .TUESDAY...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds. .TUESDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: East 3 feet at 7 seconds. .WEDNESDAY...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: East 2 feet at 6 seconds. .WEDNESDAY NIGHT...Northeast winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: East 2 feet at 6 seconds. .THURSDAY...East winds 5 to 10 knots. Seas around 2 feet. Scattered showers in the afternoon. .THURSDAY NIGHT...East winds 5 to 10 knots. Seas around 2 feet. .FRIDAY...East winds 5 to 10 knots. Seas around 2 feet. Scattered showers in the afternoon. .FRIDAY NIGHT...East winds 5 to 10 knots. Seas around 2 feet. $$ AMZ741-202015- Mona Passage Southward to 17N- 352 AM AST Mon Apr 20 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TODAY...East winds 15 to 20 knots, diminishing to 10 to 15 knots this afternoon. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 6 seconds and north 1 foot at 12 seconds. Scattered showers early this morning, then isolated showers late this morning and afternoon. .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 7 seconds and northeast 1 foot at 12 seconds. Scattered showers in the evening. .TUESDAY...East winds 10 to 15 knots with gusts up to 20 knots, diminishing to 5 to 10 knots in the afternoon. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: East 4 feet at 7 seconds and northeast 1 foot at 11 seconds. .TUESDAY NIGHT...Northeast winds 10 to 15 knots with gusts up to 20 knots. Seas around 3 feet. Wave Detail: East 3 feet at 7 seconds and northeast 1 foot at 11 seconds. .WEDNESDAY...East winds 5 to 10 knots. Seas around 3 feet. Wave Detail: East 3 feet at 7 seconds and northeast 1 foot at 11 seconds. Scattered showers in the afternoon. .WEDNESDAY NIGHT...Northeast winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 3 feet at 6 seconds and north 3 feet at 10 seconds. .THURSDAY...East winds 10 to 15 knots, diminishing to 5 to 10 knots in the afternoon. Seas 4 to 5 feet, occasionally to 6 feet. .THURSDAY NIGHT...East winds 5 to 10 knots. Seas 4 to 5 feet, occasionally to 6 feet. .FRIDAY...East winds 5 to 10 knots. Seas 3 to 5 feet, occasionally to 6 feet. Scattered showers in the afternoon. .FRIDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers. $$ AMZ742-202015- Coastal Waters of Northwestern Puerto Rico out 10 NM- 352 AM AST Mon Apr 20 2026 .TODAY...East winds 5 to 10 knots, diminishing to around 5 knots early this afternoon, then becoming northeast late. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 3 feet at 6 seconds and northeast 2 feet at 12 seconds. Scattered showers with isolated thunderstorms early this afternoon. Numerous showers with isolated thunderstorms late. .TONIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. Wave Detail: Northeast 3 feet at 6 seconds and northeast 1 foot at 11 seconds. Scattered showers in the evening. .TUESDAY...East winds 5 to 10 knots, becoming north in the afternoon. Seas 2 to 3 feet. Wave Detail: Northeast 2 feet at 7 seconds and northeast 1 foot at 11 seconds. Scattered showers in the afternoon. .TUESDAY NIGHT...Northeast winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet. Wave Detail: Northeast 2 feet at 6 seconds and northeast 1 foot at 11 seconds. .WEDNESDAY...East winds 5 to 10 knots, becoming northeast 10 to 15 knots with gusts up to 20 knots in the afternoon. Seas 2 to 3 feet. Wave Detail: Northeast 2 feet at 4 seconds and northeast 1 foot at 11 seconds. Scattered showers in the afternoon. .WEDNESDAY NIGHT...Northeast winds 10 to 15 knots with gusts up to 20 knots, becoming east 5 to 10 knots after midnight. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: North 3 feet at 10 seconds and northeast 2 feet at 4 seconds. .THURSDAY...Northeast winds 5 to 10 knots. Seas 4 to 6 feet, occasionally to 8 feet. Scattered showers in the afternoon. .THURSDAY NIGHT...East winds 5 to 10 knots. Seas 3 to 5 feet, occasionally to 6 feet.Scattered showers. .FRIDAY...East winds around 5 knots. Seas 3 to 5 feet, occasionally to 6 feet. Scattered showers in the afternoon. .FRIDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Winds and seas higher in and near thunderstorms. $$ AMZ745-202015- Coastal Waters of Southwestern Puerto Rico out 10 NM- 352 AM AST Mon Apr 20 2026 .TODAY...East winds 5 to 10 knots, becoming southeast 10 to 15 knots with gusts up to 20 knots late this morning and early afternoon, then becoming east 5 to 10 knots with gusts up to 20 knots late. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 6 seconds and north 1 foot at 7 seconds. Isolated showers early this afternoon. Scattered showers with isolated thunderstorms late. .TONIGHT...East winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. Seas 2 to 3 feet. Wave Detail: East 2 feet at 6 seconds and north 1 foot at 6 seconds. Numerous showers in the evening. .TUESDAY...East winds 5 to 10 knots, becoming southeast in the afternoon. Seas around 2 feet. Wave Detail: Southeast 2 feet at 6 seconds. Scattered showers in the afternoon. .TUESDAY NIGHT...Northeast winds 5 to 10 knots. Seas around 2 feet. Wave Detail: Northeast 2 feet at 6 seconds. .WEDNESDAY...East winds around 5 knots, becoming north with gusts up to 20 knots in the afternoon. Seas around 2 feet. Wave Detail: North 1 foot at 3 seconds and southeast 1 foot at 5 seconds. Scattered showers in the afternoon. .WEDNESDAY NIGHT...Northeast winds 5 to 10 knots. Seas around 2 feet. Wave Detail: East 2 feet at 5 seconds and northwest 2 feet at 8 seconds. .THURSDAY...East winds 5 to 10 knots, becoming northeast in the afternoon. Seas 2 to 4 feet, occasionally to 5 feet. Scattered showers in the afternoon. .THURSDAY NIGHT...East winds around 5 knots. Seas 2 to 4 feet, occasionally to 5 feet. .FRIDAY...Southeast 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 3 feet. Winds and seas higher in and near thunderstorms. $$