FZCA52 TJSJ 181940 CWFSJU Coastal Waters Forecast National Weather Service San Juan PR 340 PM AST Mon May 18 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. AMZ700-190815- 340 PM AST Mon May 18 2026 .Synopsis for Puerto Rico and the U.S. Virgin Islands Waters... A strong surface high pressure over the western Atlantic will promote moderate to fresh trades through midweek. Winds will turn more east to southeast thereafter as the surface high moves into the central Atlantic. These breezy conditions will maintain choppy seas, particularly across the offshore and exposed Atlantic and Caribbean waters. A Small Craft Advisory is in effect for the offshore Atlantic waters through at least late Tuesday. Afternoon and early evening isolated thunderstorms can be expected each day across the northwestern waters of Puerto Rico. $$ AMZ711-190815- Atlantic Waters of Puerto Rico and USVI from 10 NM to 19.5N- 340 PM AST Mon May 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH TUESDAY AFTERNOON... .TONIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 6 to 7 feet, occasionally to 9 feet. Wave Detail: East 6 feet at 9 seconds. Isolated showers. .TUESDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 5 to 7 feet, occasionally to 9 feet. Wave Detail: East 6 feet at 8 seconds and north 1 foot at 8 seconds. Scattered showers in the morning. .TUESDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas around 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 8 seconds and north 1 foot at 7 seconds. Scattered showers in the evening. .WEDNESDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas 6 to 7 feet, occasionally to 9 feet. Wave Detail: East 6 feet at 8 seconds. .WEDNESDAY NIGHT...East winds 15 to 20 knots with gusts up to 30 knots. Seas around 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 8 seconds. Scattered showers. .THURSDAY...East winds 15 to 20 knots, diminishing to 10 to 15 knots in the afternoon. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 8 seconds. .THURSDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 5 to 6 feet, occasionally to 8 feet. Scattered showers. .FRIDAY...East winds 10 to 15 knots. Seas 4 to 5 feet, occasionally to 6 feet. .FRIDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. .SATURDAY...East winds 15 to 20 knots. Seas 5 to 6 feet, occasionally to 8 feet. .SATURDAY NIGHT...East winds 15 to 20 knots. Seas 5 to 6 feet, occasionally to 8 feet. Scattered showers. $$ AMZ712-190815- Coastal Waters of Northern Puerto Rico out 10 NM- 340 PM AST Mon May 18 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TONIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots late this evening and overnight. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 8 seconds and north 1 foot at 8 seconds. Isolated showers early this evening. Scattered showers late this evening, then isolated showers after midnight. .TUESDAY...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 8 seconds and north 1 foot at 8 seconds. Scattered showers in the afternoon. .TUESDAY NIGHT...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 8 seconds and north 1 foot at 7 seconds. Scattered showers in the evening. .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 8 seconds. Scattered showers..WEDNESDAY NIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Gusts up to 30 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 8 seconds. Scattered showers. .THURSDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 8 seconds. Scattered showers in the afternoon. .THURSDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Scattered showers. .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. Scattered showers. .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. $$ AMZ716-190815- Coastal Waters from Cabo San Juan to the waters between Anegada Island and Virgin Gorda and North 10 NM- 340 PM AST Mon May 18 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TONIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds. Isolated showers. .TUESDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 6 seconds. Scattered showers. .TUESDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds and north 1 foot at 8 seconds. Scattered showers in the evening. .WEDNESDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds and north 1 foot at 7 seconds. Scattered showers. .WEDNESDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds. Scattered showers after midnight. .THURSDAY...East winds around 15 knots with gusts up to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds. Scattered showers. .THURSDAY NIGHT...East winds around 15 knots with gusts up to 25 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers. .FRIDAY...East winds around 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers in the morning. .FRIDAY NIGHT...East winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. .SATURDAY...East winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers in the afternoon. .SATURDAY NIGHT...East winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Scattered showers. $$ AMZ723-190815- Anegada Passage east of Virgin Gorda and Saint Croix south to 17N- 340 PM AST Mon May 18 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .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 6 feet at 7 seconds. Scattered showers late this evening. Isolated showers after midnight. .TUESDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas around 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 7 seconds. Scattered showers. .TUESDAY 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. .WEDNESDAY...East winds 15 to 20 knots with gusts up to 30 knots. Seas around 6 feet, occasionally to 8 feet. Wave Detail: East 6 feet at 7 seconds. Scattered showers. .WEDNESDAY NIGHT...East winds 15 to 20 knots withgusts up to 25 knots. Seas 5 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 7 seconds. .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 5 feet at 7 seconds. .THURSDAY NIGHT...East winds around 15 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. .FRIDAY...East winds around 15 knots. Seas 4 to 5 feet, occasionally to 6 feet. .FRIDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 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. Scattered showers. $$ AMZ726-190815- Coastal waters east of Puerto Rico, around Vieques, and around and just north of Culebra and Saint John- 340 PM AST Mon May 18 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TONIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds. Isolated showers early this evening, then scattered showers late this evening. Isolated showers after midnight. .TUESDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds. Scattered showers. .TUESDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds. .WEDNESDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 7 seconds. Scattered showers. .WEDNESDAY NIGHT...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds. Scattered showers. .THURSDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds. Scattered showers. .THURSDAY NIGHT...East winds around 15 knots with gusts up to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers. .FRIDAY...East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers in the morning. .FRIDAY NIGHT...East winds 15 to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. Scattered showers. .SATURDAY...East winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Scattered showers in the afternoon. .SATURDAY NIGHT...East winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Scattered showers. $$ AMZ733-190815- Caribbean waters of Puerto Rico from 10 NM to 17N, including the coastal waters of Saint Croix- 340 PM AST Mon May 18 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .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 7 seconds. Scattered showers early this evening, then isolated showers late this evening and overnight. .TUESDAY...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. .TUESDAY NIGHT...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 7 seconds. Scattered showers after midnight. .WEDNESDAY...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. .WEDNESDAY 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. .THURSDAY...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 in the morning. .THURSDAY NIGHT...East winds around 15 knots with gusts up to 25 knots. Seas 4 to 5 feet, occasionally to 6 feet. .FRIDAY...East winds around 15 knots. Seas 4 to 5 feet, occasionally to 6 feet. .FRIDAY NIGHT...East winds 15 to 20 knots. Seas around 4 feet, occasionally to 5 feet. Scattered showers. .SATURDAY...East winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Scattered showers in the morning. .SATURDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. Scattered showers. $$ AMZ735-190815- Coastal Waters of Southern Puerto Rico out 10 NM- 340 PM AST Mon May 18 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TONIGHT...East winds 10 to 15 knots, increasing to 15 to 20 knots late this evening, then diminishing to 10 to 15 knots after midnight. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds. Isolated showers early this evening. Scattered showers late this evening, then isolated showers after midnight. .TUESDAY...East winds 10 to 15 knots, increasing to 15 to 20 knots in the afternoon. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds. .TUESDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 4 feet at 7 seconds. Scattered showers after midnight. .WEDNESDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds. Scattered showers in the morning. .WEDNESDAY NIGHT...East winds 15 to 20 knots, diminishing to 10 to 15 knots after midnight. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds. Scattered showers. .THURSDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas 3 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds. Scattered showers in the morning. .THURSDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 3 to 4 feet, occasionally to 5 feet. .FRIDAY...East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. .FRIDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. .SATURDAY...East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. .SATURDAY NIGHT...East winds 10 to 15 knots. Seas 3 to 4 feet, occasionally to 5 feet. $$ AMZ741-190815- Mona Passage Southward to 17N- 340 PM AST Mon May 18 2026 ...SMALL CRAFT SHOULD EXERCISE CAUTION... .TONIGHT...East winds 10 to 15 knots, increasing to 15 to 20 knots late this evening and overnight. Seas 4 to 5 feet, occasionally to 6 feet. Wave Detail: East 5 feet at 7 seconds. Scattered showers. .TUESDAY...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 north 1 foot at 8 seconds. .TUESDAY 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 5 feet at 7 seconds and north 1 foot at 8 seconds. .WEDNESDAY...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 in the morning. .WEDNESDAY NIGHT...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. .THURSDAY...East winds 15 to 20 knots with gusts up to 25 knots. Seas 4 to 6 feet, occasionally to 8 feet. Wave Detail: East 5 feet at 7 seconds. Scattered showers in the afternoon. .THURSDAY NIGHT...East winds 10 to 15 knots, increasing to 15 to 20 knots after midnight. Seas 4 to 5 feet, occasionally to 6 feet. .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 10 to 15 knots, increasing to 15 to 20 knots after midnight. Seas 3 to 5 feet, occasionally to 6 feet. Scattered showers. .SATURDAY...East winds 15 to 20 knots. Seas 3 to 5 feet, occasionally to 6 feet. Scattered showers in the afternoon. .SATURDAY NIGHT...East winds 15 to 20 knots. Seas 4 to 5 feet, occasionally to 6 feet. $$ AMZ742-190815- Coastal Waters of Northwestern Puerto Rico out 10 NM- 340 PM AST Mon May 18 2026 .TONIGHT...East winds 10 to 15 knots with gusts up to 20 knots, diminishing to 5 to 10 knots with gusts up to 20 knots late this evening and overnight. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 7 seconds. Scattered showers with isolated thunderstorms early this evening, then isolated showers late this evening. .TUESDAY...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 3 feet at 7 seconds and north 1 foot at 9 seconds. Scattered showers in the afternoon. .TUESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 7 seconds and north 1 foot at 8 seconds. Scattered showers in the evening. .WEDNESDAY...East winds 10 to 15 knots, diminishing to 5 to 10 knots in the afternoon. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 3 feet at 7 seconds. Numerous showers in the afternoon. .WEDNESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: East 3 feet at 7 seconds. Scattered showers in the evening. .THURSDAY...East winds 5 to 10 knots. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail: Northeast 3 feet at 7 seconds. Numerous showers in the afternoon. .THURSDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. Scattered showers. .FRIDAY...East winds 5 to 10 knots, becoming northeast 10 to 15 knots in the afternoon. Seas 2 to 3 feet. Numerous showers in the afternoon. .FRIDAY NIGHT...East winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. Seas 2 to 3 feet. Scattered showers. .SATURDAY...East winds 5 to 10 knots. Seas 2 to 3 feet. Scattered showers in the afternoon. .SATURDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 4 feet, occasionally to 5 feet. Winds and seas higher in and near thunderstorms. $$ AMZ745-190815- Coastal Waters of Southwestern Puerto Rico out 10 NM- 340 PM AST Mon May 18 2026 .TONIGHT...East winds 5 to 10 knots, increasing to 10 to 15 knots with gusts up to 20 knots late this evening and overnight. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 6 seconds. Isolated showers early this evening, then scattered showers late this evening. .TUESDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 6 seconds. .TUESDAY NIGHT...East winds 10 to 15 knots with gusts up to 20 knots, diminishing to 5 to 10 knots after midnight. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 6 seconds and north 1 foot at 8 seconds. .WEDNESDAY...East winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 6 seconds and north 1 foot at 7 seconds. .WEDNESDAY NIGHT...East winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 3 feet. Wave Detail: Southeast 3 feet at 5 seconds and north 1 foot at 6 seconds. .THURSDAY...East winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet. Wave Detail: Southeast 2 feet at 6 seconds. .THURSDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. .FRIDAY...East winds 5 to 10 knots, increasing to 10 to 15 knots in the afternoon. Seas 2 to 3 feet. .FRIDAY NIGHT...East winds 10 to 15 knots. Seas 2 to 3 feet. Scattered showers. .SATURDAY...East winds 5 to 10 knots, increasing to 10 to 15 knots in the afternoon. Seas 2 to 3 feet. Scattered showers in the afternoon. .SATURDAY NIGHT...East winds 10 to 15 knots, diminishing to 5 to 10 knots after midnight. Seas 2 to 3 feet. $$