FZUS51 KBOX 210804 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 404 AM EDT Sun Jun 21 2026 Coastal waters from the Merrimack River MA to Watch Hill RI out to 60 NM ANZ200-212100- 404 AM EDT Sun Jun 21 2026 .Synopsis for Massachusetts and Rhode Island coastal waters... Relatively tranquil boating conditions across the coastal waters today. Another coastal system approaches from the W along the S coast of Ne England late Mon into Tue. Weak high pres should then move over the waters Wed into Thu. $$ ANZ250-212100- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 404 AM EDT Sun Jun 21 2026 .TODAY...W winds 5 to 10 kt, becoming S this afternoon. Seas around 2 ft. Wave Detail: SE 2 ft at 9 seconds and W 1 foot at 3 seconds. A slight chance of showers this afternoon. .TONIGHT...SW winds around 5 kt. Seas around 2 ft. Wave Detail: W 1 foot at 3 seconds and E 1 foot at 5 seconds. .MON...SW winds around 5 kt, becoming S in the afternoon. Seas around 2 ft. Wave Detail: NW 1 foot at 2 seconds and SE 1 foot at 7 seconds. A chance of showers in the afternoon. .MON NIGHT...SE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 6 seconds and SW 1 foot at 3 seconds. Showers with a chance of tstms. .TUE...SW winds 10 to 15 kt with gusts up to 20 kt, becoming N 5 to 10 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: SE 3 ft at 6 seconds and SW 1 foot at 3 seconds. Showers, mainly in the morning. .TUE NIGHT...SW winds around 5 kt, becoming NW after midnight. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds and W 1 foot at 3 seconds. .WED THROUGH THU NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-212100- Massachusetts Bay and Ipswich Bay- 404 AM EDT Sun Jun 21 2026 .TODAY...W winds 5 to 10 kt, becoming SE this afternoon. Seas 1 foot or less. Wave Detail: W 1 foot at 3 seconds and N 1 foot at 4 seconds. A slight chance of showers and tstms this afternoon. .TONIGHT...S winds around 5 kt, becoming W after midnight. Seas 1 foot or less. Wave Detail: W 1 foot at 2 seconds and SE 1 foot at 3 seconds. .MON...SW winds around 5 kt, becoming SE in the afternoon. Seas 1 foot or less, then around 2 ft in the afternoon. Wave Detail: NW 1 foot at 2 seconds and E 1 foot at 4 seconds, becoming W 1 foot at 2 seconds and E 1 foot at 4 seconds. A chance of showers in the afternoon. .MON NIGHT...SE winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: S 2 ft at 5 seconds. Showers. A chance of tstms in the evening. .TUE...W winds around 10 kt, becoming NE in the afternoon. Seas around 2 ft. Wave Detail: SE 2 ft at 5 seconds and SW 1 foot at 3 seconds. Showers, mainly in the morning. .TUE NIGHT...SW winds around 5 kt, becoming NW after midnight. Seas around 2 ft in the evening, then 1 foot or less. Wave Detail: NW 1 foot at 2 seconds and S 1 foot at 3 seconds, becoming NW 1 foot at 2 seconds and SE 1 foot at 7 seconds. .WED THROUGH THU NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ231-212100- Cape Cod Bay- 404 AM EDT Sun Jun 21 2026 .TODAY...W winds 5 to 10 kt, becoming S this afternoon. Seas 1 foot or less, then around 2 ft this afternoon. Wave Detail: NW 1 foot at 4 seconds and S 1 foot at 9 seconds, becoming W 1 foot at 3 seconds and N 1 foot at 5seconds. .TONIGHT...SW winds 5 to 10 kt, becoming W after midnight. Seas around 2 ft in the evening, then 1 foot or less. Wave Detail: SW 1 foot at 3 seconds and E 1 foot at 5 seconds, becoming W 1 foot at 3 seconds and SE 1 foot at 4 seconds. .MON...SW winds around 5 kt, becoming S in the afternoon. Seas 1 foot or less, then around 2 ft in the afternoon. Wave Detail: E 1 foot at 3 seconds and W 1 foot at 3 seconds. A chance of showers in the afternoon. .MON NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft at 4 seconds and SE 1 foot at 7 seconds. Showers with a chance of tstms. .TUE...SW winds 10 to 15 kt with gusts up to 20 kt, becoming N 5 to 10 kt in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds and E 1 foot at 11 seconds. Showers. .TUE NIGHT...SW winds around 5 kt, becoming NW after midnight. Seas 1 foot or less. Wave Detail: NW 1 foot at 2 seconds and E 1 foot at 7 seconds. A chance of showers in the evening. .WED THROUGH THU NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-212100- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 NM- 404 AM EDT Sun Jun 21 2026 .TODAY...SW winds 5 to 10 kt. Gusts up to 20 kt this afternoon. Seas 2 to 4 ft. Wave Detail: S 3 ft at 9 seconds and SE 2 ft at 12 seconds. .TONIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 8 seconds and NW 1 foot at 3 seconds. .MON...SW winds around 5 kt, becoming S in the afternoon. Seas around 2 ft. Wave Detail: SE 2 ft at 6 seconds and W 1 foot at 3 seconds. .MON NIGHT...SE winds 10 to 15 kt, becoming S 15 to 20 kt after midnight. Gusts up to 25 kt. Seas 2 to 3 ft, building to 3 to 5 ft after midnight. Wave Detail: SW 3 ft at 5 seconds and SE 1 foot at 8 seconds, becoming S 4 ft at 5 seconds and E 1 foot at 8 seconds. A chance of showers in the evening, then showers with a chance of tstms after midnight. .TUE...SW winds 15 to 20 kt, becoming NW 10 to 15 kt in the afternoon. Gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: SE 4 ft at 7 seconds and SW 1 foot at 4 seconds. Showers in the morning. A chance of showers in the afternoon. .TUE NIGHT...NW winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: SE 3 ft at 7 seconds and NW 1 foot at 3 seconds. A chance of showers in the evening. .WED THROUGH THU NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ255-212100- Coastal Waters extending out to 25 NM South of Marthas Vineyard and Nantucket- 404 AM EDT Sun Jun 21 2026 .TODAY...SW winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 8 seconds and W 2 ft at 4 seconds. .TONIGHT...SW winds 10 to 15 kt, becoming W 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 8 seconds and W 1 foot at 3 seconds. .MON...SW winds around 5 kt, becoming S in the afternoon. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 7 seconds and W 1 foot at 3 seconds. .MON NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft, building to 4 to 6 ft after midnight. Wave Detail: SW 4 ft at 6 seconds and E 1 foot at 8 seconds, becoming S 4 ft at 5 seconds and E 2 ft at 10 seconds. A chance of showers in the evening. Showers after midnight. .TUE...S winds 15 to 20 kt, becoming W 10 to 15 kt in the afternoon. Seas 4 to 6 ft. Wave Detail: S 4 ft at 7 seconds and W 1 foot at 6 seconds. Showers. .TUE NIGHT...NW winds 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: S 4 ft at 7 seconds and NW 3 ft at 5 seconds. A chance of showers in the evening. .WED THROUGH THU NIGHT...S winds 5 to 10 kt. Seas 2 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-212100- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 NM South of Block Island- 404 AM EDT Sun Jun 21 2026 .TODAY...W winds 5 to 10 kt, becoming SW 10 to 15 kt this afternoon. Seas 3 to 4 ft. Wave Detail: S 3 ft at 8 seconds and W 1 foot at 8 seconds. .TONIGHT...SW winds 10 to 15 kt, becoming W 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 8 seconds and W 1 foot at 3 seconds. .MON...S winds around 5 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 7 seconds and W 1 foot at 5 seconds. A chance of showers in the afternoon. .MON NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft, building to 4 to 6 ft after midnight. Wave Detail: SE 4 ft at 6 seconds and SW 1 foot at 4 seconds, becoming SE 4 ft at 7 seconds and W 1 foot at 6 seconds. Showers with a chance of tstms. .TUE...SW winds 10 to 15 kt with gusts up to 20 kt, becoming NW in the afternoon. Seas 4 to 6 ft. Wave Detail: S 4 ft at 7 seconds and W 2 ft at 7 seconds. Showers. .TUE NIGHT...NW winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 7 seconds and W 1 foot at 7 seconds. .WED THROUGH THU NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ232-212100- Nantucket Sound- 404 AM EDT Sun Jun 21 2026 .TODAY...SW winds 5 to 10 kt. Gusts up to 20 kt this afternoon. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and NE 1 foot at 5 seconds. .TONIGHT...W winds 5 to 10 kt. Seas around 2 ft. Wave Detail: W 2 ft at 3 seconds and S 1 foot at 8 seconds. .MON...SW winds around 5 kt, becoming S in the afternoon. Seas around 2 ft. Wave Detail: W 1 foot at 4 seconds and SE 1 foot at 7 seconds. A chance of showers in the afternoon. .MON NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 7 seconds. Showers. A chance of tstms after midnight. .TUE...SW winds 10 to 15 kt with gusts up to 20 kt, becoming NW in the afternoon. Seas 2 to 4 ft. Wave Detail: S 3 ft at 5 seconds and E 1 foot at 12 seconds. Showers. .TUE NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: NW 1 foot at 4 seconds and S 1 foot at 6 seconds. A chance of showers in the evening. .WED THROUGH THU NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-212100- Vineyard Sound- 404 AM EDT Sun Jun 21 2026 .TODAY...W winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts up to 20 kt this afternoon. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SW 2 ft at 8 seconds. .TONIGHT...SW winds 10 to 15 kt, becoming W around 5 kt after midnight. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SW 2 ft at 8 seconds. .MON...SW winds around 5 kt, becoming S in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 7 seconds and SE 1 foot at 12 seconds. A chance of showers in the afternoon. .MON NIGHT...S winds 10 to 15 kt, increasing to 15 to 20 kt after midnight. Seas 2 to 4 ft. Wave Detail: S 3 ft at 4 seconds and S 2 ft at 7 seconds. Showers with a chance oftstms. .TUE...SW winds 10 to 15 kt with gusts up to 20 kt, becoming NW 5 to 10 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 6 seconds. Showers. .TUE NIGHT...S winds 5 to 10 kt, becoming NW after midnight. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 7 seconds and NE 1 foot at 3 seconds. A chance of showers in the evening. .WED THROUGH THU NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ234-212100- Buzzards Bay- 404 AM EDT Sun Jun 21 2026 .TODAY...W winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts up to 20 kt this afternoon. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and SW 2 ft at 8 seconds. A slight chance of showers this afternoon. .TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt, diminishing to around 5 kt after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and S 1 foot at 7 seconds. .MON...SW winds around 5 kt, becoming S in the afternoon. Seas 1 foot or less, then around 2 ft in the afternoon. Wave Detail: SW 1 foot at 6 seconds and SE 1 foot at 12 seconds, becoming S 2 ft at 6 seconds and SE 1 foot at 12 seconds. A chance of showers in the afternoon. .MON NIGHT...S winds 10 to 15 kt, increasing to 15 to 20 kt after midnight. Seas 2 to 3 ft. Wave Detail: S 3 ft at 6 seconds. Showers with a chance of tstms. .TUE...SW winds 10 to 15 kt with gusts up to 20 kt, becoming N 5 to 10 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 6 seconds. Showers. .TUE NIGHT...SE winds 5 to 10 kt, becoming NW after midnight. Seas around 2 ft. Wave Detail: NE 1 foot at 2 seconds and SW 1 foot at 5 seconds. A chance of showers in the evening. .WED THROUGH THU NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-212100- Rhode Island Sound- 404 AM EDT Sun Jun 21 2026 .TODAY...W winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts up to 20 kt this afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 8 seconds and W 2 ft at 4 seconds. .TONIGHT...SW winds 10 to 15 kt with gusts up to 20 kt, becoming W 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave Detail: S 3 ft at 8 seconds and W 1 foot at 4 seconds. .MON...S winds around 5 kt, becoming SE 10 to 15 kt in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 8 seconds and SW 1 foot at 5 seconds. A chance of showers in the afternoon. .MON NIGHT...S winds 15 to 20 kt. Seas 3 to 5 ft. Wave Detail: S 4 ft at 6 seconds. Showers with a chance of tstms. .TUE...SW winds 10 to 15 kt with gusts up to 20 kt, becoming N in the afternoon. Seas 3 to 5 ft. Wave Detail: SW 4 ft at 7 seconds. Showers, mainly in the morning. .TUE NIGHT...SW winds 5 to 10 kt, becoming NW after midnight. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 7 seconds and E 1 foot at 6 seconds. .WED THROUGH THU NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ237-212100- Block Island Sound- 404 AM EDT Sun Jun 21 2026 .TODAY...W winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 8 seconds and W 1 foot at 8 seconds. .TONIGHT...SW winds 10 to 15 kt, becoming W around 5 kt after midnight. Seas 2 to 3 ft. Wave Detail: S 2 ft at 8 seconds and W 1 foot at 3 seconds. .MON...SE winds around 5 kt, increasing to 5 to 10 kt in theafternoon. Seas around 2 ft. Wave Detail: S 2 ft at 6 seconds. A chance of showers in the afternoon. .MON NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 6 seconds. Showers with a chance of tstms. .TUE...W winds around 10 kt, becoming NW in the afternoon. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 6 seconds and W 1 foot at 5 seconds. Showers, mainly in the morning. .TUE NIGHT...W winds around 5 kt, becoming NW after midnight. Seas 2 to 4 ft. Wave Detail: SE 3 ft at 7 seconds. .WED THROUGH THU NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-212100- Boston Harbor- 404 AM EDT Sun Jun 21 2026 .TODAY...W winds 5 to 10 kt, becoming E this afternoon. Waves 1 foot or less. A slight chance of showers and tstms this afternoon. .TONIGHT...S winds around 5 kt, becoming W after midnight. Waves 1 foot or less. .MON...S winds around 5 kt, becoming SE in the afternoon. Waves 1 foot or less. A chance of showers in the afternoon. .MON NIGHT...SE winds 10 to 15 kt. Waves around 2 ft. Showers. A chance of tstms in the evening. .TUE...W winds 5 to 10 kt, becoming NE in the afternoon. Waves 1 foot or less. Showers likely, mainly in the morning. .TUE NIGHT...NW winds around 5 kt, increasing to 5 to 10 kt after midnight. Waves 1 foot or less. .WED THROUGH THU...S winds 5 to 10 kt. Waves 1 foot or less. .THU NIGHT...S winds 5 to 10 kt. Waves 1 foot or less. A chance of showers. Winds and waves higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ236-212100- Narragansett Bay- 404 AM EDT Sun Jun 21 2026 .TODAY...W winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts up to 20 kt this afternoon. Waves around 2 ft. A slight chance of showers this afternoon. .TONIGHT...W winds 10 to 15 kt, becoming NW around 5 kt after midnight. Waves around 2 ft. .MON...SE winds around 5 kt, becoming S in the afternoon. Waves around 2 ft. A chance of showers in the afternoon. .MON NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. Showers with a chance of tstms. .TUE...W winds 10 to 15 kt, becoming N 5 to 10 kt in the afternoon. Waves 2 to 3 ft. Showers, mainly in the morning. .TUE NIGHT...W winds around 5 kt. Waves around 2 ft. .WED THROUGH THU NIGHT...S winds 5 to 10 kt. Waves around 2 ft. Winds and waves higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ280-212100- Ocean Waters from the Merrimack River to Plymouth from 40 to 60 NM- 404 AM EDT Sun Jun 21 2026 .TODAY...W winds 5 to 10 kt, becoming SW this afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 9 seconds and W 2 ft at 4 seconds. .TONIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 7 seconds and W 1 foot at 3 seconds. .MON...W winds around 5 kt, becoming S in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 8 seconds and W 1 foot at 2 seconds. A chance of showers in the afternoon. .MON NIGHT...SE winds 10 to 15 kt, becoming S 15 to 20 kt after midnight. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SE 4 ft at 6 seconds and W 1 foot at 3 seconds. Showers. .TUE...SW winds 15 to 20 kt, becoming W 5 to 10 kt in the afternoon. Gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: SE 4 ft at 7 seconds and SW 1 foot at 4 seconds. Showers, mainly in the morning. .TUE NIGHT...W winds 5to 10 kt. Seas 3 to 4 ft. Wave Detail: E 3 ft at 6 seconds and W 1 foot at 3 seconds. .WED THROUGH THU NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ281-212100- Ocean Waters from Provincetown to Nantucket from 20 to 60 NM- 404 AM EDT Sun Jun 21 2026 .TODAY...SW winds 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: S 4 ft at 8 seconds and NW 1 foot at 4 seconds. .TONIGHT...SW winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 8 seconds and N 1 foot at 4 seconds. .MON...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and E 1 foot at 3 seconds. .MON NIGHT...SE winds 10 to 15 kt, becoming S 15 to 20 kt after midnight. Gusts up to 25 kt. Seas 2 to 3 ft, building to 3 to 5 ft after midnight. Wave Detail: W 3 ft at 4 seconds and S 3 ft at 7 seconds, becoming SW 4 ft at 5 seconds and E 1 foot at 8 seconds. A chance of showers in the evening. Showers after midnight. .TUE...S winds 15 to 20 kt, becoming W 10 to 15 kt in the afternoon. Gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: SE 4 ft at 7 seconds and SW 1 foot at 4 seconds. Showers. .TUE NIGHT...NW winds 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: S 4 ft at 7 seconds and NW 1 foot at 3 seconds. A chance of showers in the evening. .WED THROUGH THU NIGHT...S winds 5 to 10 kt. Seas 3 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ282-212100- Ocean Waters from Marthas Vineyard to Nantucket from 25 to 60 NM- 404 AM EDT Sun Jun 21 2026 .TODAY...SW winds 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: SW 4 ft at 7 seconds and SE 1 foot at 12 seconds. .TONIGHT...SW winds 5 to 10 kt. Seas around 3 ft. Wave Detail: SW 3 ft at 8 seconds and SE 1 foot at 12 seconds. .MON...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 7 seconds and NW 1 foot at 3 seconds. .MON NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft, building to 4 to 6 ft after midnight. Wave Detail: S 3 ft at 7 seconds and W 1 foot at 4 seconds, becoming SW 4 ft at 6 seconds and SE 1 foot at 11 seconds. A chance of showers after midnight. .TUE...S winds 15 to 20 kt, becoming W 10 to 15 kt in the afternoon. Seas 5 to 6 ft. Wave Detail: S 5 ft at 6 seconds and SW 1 foot at 3 seconds. Showers. .TUE NIGHT...NW winds 5 to 10 kt. Seas 4 to 5 ft. Wave Detail: S 5 ft at 7 seconds and N 1 foot at 4 seconds. A chance of showers. .WED THROUGH THU NIGHT...S winds 5 to 10 kt. Seas 2 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ283-212100- Ocean Waters from Montauk NY to Marthas Vineyard from 25 to 60 NM- 404 AM EDT Sun Jun 21 2026 .TODAY...W winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 8 seconds and W 1 foot at 5 seconds. .TONIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 7 seconds and NW 1 foot at 4 seconds. .MON...S winds around 5 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 7 seconds and W 1 foot at 4 seconds. .MON NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft, building to 4 to 6 ft after midnight. Wave Detail: SE 4 ft at 5 seconds and SW 1 foot at 4 seconds, becoming SW 4 ft at 7 seconds. A chance of showers in the evening. Showers after midnight. .TUE...SW winds 10 to 15 kt with gusts up to 25 kt, becoming NW in the afternoon. Seas 5 to 6 ft. Wave Detail: S 4 ft at 6 seconds and N 2 ft at 7 seconds. Showers in the morning. A chance of showers in the afternoon. .TUE NIGHT...NW winds 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: S 4 ft at 7 seconds and N 2 ft at 7 seconds. A chance of showers in the evening. .WED THROUGH THU NIGHT...S winds 5 to 10 kt. Seas 2 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ For the latest updates...please visit our webpage at www.weather.gov/boston You can follow us on Facebook at www.facebook.com/us.nationalweatherservice.boston.gov You can follow us on Twitter at @NWSBoston