


Coastal Waters Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
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772 FZUS51 KBOX 140504 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 104 AM EDT Thu Aug 14 2025 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-141800- 104 AM EDT Thu Aug 14 2025 .Synopsis for Massachusetts and Rhode Island coastal waters... Scattered showers possible on Thursday. A cold front will cross the waters Thu night into Fri. High pressure return Friday into the weekend. $$ ANZ250-141800- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 104 AM EDT Thu Aug 14 2025 .REST OF TONIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and E 2 ft at 7 seconds. A slight chance of showers. .THU...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and E 2 ft at 7 seconds. .THU NIGHT...NW winds 5 to 10 kt, becoming N 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 3 ft. Wave Detail: E 3 ft at 7 seconds and SW 2 ft at 3 seconds. .FRI...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: NE 4 ft at 5 seconds and S 1 foot at 4 seconds. .FRI NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 6 seconds and E 1 foot at 15 seconds. .SAT AND SAT NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft at 3 seconds and NE 2 ft at 6 seconds. .SUN...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. .SUN NIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas around 3 ft. A chance of showers. .MON AND MON NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt, becoming E 5 to 10 kt. Seas 3 to 5 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-141800- Massachusetts Bay and Ipswich Bay- 104 AM EDT Thu Aug 14 2025 .REST OF TONIGHT...SW winds around 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and E 2 ft at 7 seconds. .THU...SW winds 5 to 10 kt, becoming SE in the afternoon. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and E 2 ft at 7 seconds. A chance of showers in the afternoon. .THU NIGHT...NE winds 5 to 10 kt, becoming N 10 to 15 kt with gusts up to 20 kt after midnight. Seas around 2 ft. Wave Detail: SE 2 ft at 6 seconds and S 1 foot at 3 seconds. .FRI...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 5 seconds and E 1 foot at 16 seconds. .FRI NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 6 seconds and E 1 foot at 15 seconds. .SAT AND SAT NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 3 seconds and NE 2 ft at 6 seconds. .SUN...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. .SUN NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. .MON AND MON NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt, becoming E 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. $$ ANZ231-141800- Cape Cod Bay- 104 AM EDT Thu Aug 14 2025 .REST OF TONIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SW 1 foot at 3 seconds and E 1 foot at 7 seconds. A slight chance of showers and tstms. Vsby 1 to 3 NM. .THU...S winds 5 to 10 kt. Seas around 2 ft in the morning, then 1 foot or less. Wave Detail: SW 1 foot at 2 seconds and E 1 foot at 7 seconds, becoming S 1 foot at 2 seconds and E 1 foot at 7 seconds. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 to 3 NM in the morning. .THU NIGHT...SW winds around 5 kt, becoming N after midnight. Seas 1 foot or less, then around 2 ft after midnight. Wave Detail: SW 1 foot at 2 seconds and E 1 foot at 7 seconds, becoming NW 1 foot at 3 seconds and E 1 foot at 7 seconds. .FRI...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 16 seconds. .FRI NIGHT AND SAT...E winds 5 to 10 kt. Seas around 2 ft. Wave Detail: N 2 ft at 5 seconds and SE 1 foot at 15 seconds. .SAT NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 1 foot at 4 seconds and E 1 foot at 15 seconds. .SUN...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. .SUN NIGHT...SW winds around 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of showers. .MON AND MON NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt, diminishing to 5 to 10 kt. Seas 2 to 4 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-141800- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 104 AM EDT Thu Aug 14 2025 .REST OF TONIGHT...SW 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 E 2 ft at 8 seconds. A slight chance of showers. .THU...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft at 4 seconds and E 2 ft at 8 seconds. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or less in the afternoon. .THU NIGHT...S winds around 5 kt, becoming N after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 2 ft at 8 seconds. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or less after midnight. .FRI...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: NE 3 ft at 6 seconds and S 1 foot at 5 seconds. Patchy fog in the morning with vsby 1 NM or less. .FRI NIGHT AND SAT...E winds 10 to 15 kt. Seas 2 to 4 ft. Wave Detail: NE 3 ft at 6 seconds and S 1 foot at 6 seconds. .SAT NIGHT...SE winds 5 to 10 kt, becoming S after midnight. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 6 seconds and SE 1 foot at 15 seconds. .SUN...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. .SUN NIGHT...SW winds around 15 kt with gusts up to 25 kt. Seas around 3 ft. A chance of showers. .MON AND MON NIGHT...NE winds 10 to 15 kt with gusts up to 25 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. $$ ANZ255-141800- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 104 AM EDT Thu Aug 14 2025 .REST OF TONIGHT...SW winds around 10 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and E 2 ft at 8 seconds. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .THU...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and E 2 ft at 8 seconds. Patchy fog. A chance of showers in the afternoon. Vsby 1 NM or less. .THU NIGHT...S winds around 5 kt, becoming N after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 2 ft at 8 seconds. Patchy fog. Vsby 1 NM or less. .FRI...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 5 seconds and SW 2 ft at 6 seconds. Patchy fog in the morning with vsby 1 to 3 NM. .FRI NIGHT AND SAT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 5 seconds and S 1 foot at 6 seconds. .SAT NIGHT...SE winds 5 to 10 kt, becoming S after midnight. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 6 seconds and SE 1 foot at 15 seconds. .SUN THROUGH MON NIGHT...NE winds 15 to 20 kt. Seas 2 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-141800- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 104 AM EDT Thu Aug 14 2025 .REST OF TONIGHT...SW winds around 10 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and E 2 ft at 8 seconds. Patchy fog. A chance of showers with a slight chance of tstms. Vsby 1 NM or less. .THU...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and E 2 ft at 8 seconds. Patchy fog. A chance of showers. Vsby 1 NM or less, increasing to 1 to 3 NM in the afternoon. .THU NIGHT...S winds around 5 kt, becoming N after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and SE 2 ft at 8 seconds. Patchy fog. Vsby 1 NM or less. .FRI...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 5 seconds and S 1 foot at 6 seconds. Patchy fog in the morning with vsby 1 to 3 NM. .FRI NIGHT AND SAT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 5 seconds and S 1 foot at 6 seconds. .SAT NIGHT...SE winds 5 to 10 kt, becoming S after midnight. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 6 seconds and SE 1 foot at 13 seconds. .SUN THROUGH MON NIGHT...E winds 15 to 20 kt. Seas 2 to 4 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. $$ ANZ232-141800- Nantucket Sound- 104 AM EDT Thu Aug 14 2025 .REST OF TONIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and E 1 foot at 7 seconds. Patchy fog. A slight chance of showers. Vsby 1 to 3 NM. .THU...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and E 1 foot at 7 seconds. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 to 3 NM. .THU NIGHT...SW winds 5 to 10 kt, becoming N 10 to 15 kt after midnight. Seas around 2 ft. Wave Detail: SW 1 foot at 3 seconds and E 1 foot at 7 seconds. Patchy fog. Vsby 1 to 3 NM. .FRI...NE winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: NE 2 ft at 3 seconds and SW 1 foot at 5 seconds. .FRI NIGHT AND SAT...E winds 10 to 15 kt. Seas around 2 ft. Wave Detail: NE 2 ft at 4 seconds and S 1 foot at 5 seconds. .SAT NIGHT...SE winds 5 to 10 kt, becoming S after midnight. Seas around 2 ft. Wave Detail: SE 1 foot at 5 seconds and SE 1 foot at 15 seconds. .SUN THROUGH MON NIGHT...NE winds 15 to 20 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-141800- Vineyard Sound- 104 AM EDT Thu Aug 14 2025 .REST OF TONIGHT...SW winds around 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. Patchy fog. A chance of showers with a slight chance of tstms. Vsby 1 NM or less. .THU...SW winds around 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. Patchy fog. A chance of showers in the afternoon. Vsby 1 NM or less, increasing to 1 to 3 NM in the afternoon. .THU NIGHT...SW winds around 5 kt, becoming N after midnight. Seas 1 foot or less, then around 2 ft after midnight. Wave Detail: SW 1 foot at 4 seconds and SE 1 foot at 8 seconds, becoming W 1 foot at 4 seconds and E 1 foot at 8 seconds. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or less after midnight. .FRI...NE winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: NE 2 ft at 3 seconds and SW 1 foot at 5 seconds. .FRI NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft. Wave Detail: NE 2 ft at 3 seconds and S 1 foot at 6 seconds. .SAT AND SAT NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE 1 foot at 3 seconds and S 1 foot at 5 seconds. .SUN THROUGH MON NIGHT...NE winds 15 to 20 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. $$ ANZ234-141800- Buzzards Bay- 104 AM EDT Thu Aug 14 2025 .REST OF TONIGHT...SW winds around 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. Patchy fog. A slight chance of showers. Vsby 1 NM or less. .THU...SW winds 5 to 10 kt. Seas around 2 ft in the morning, then 1 foot or less. Wave Detail: SW 1 foot at 4 seconds and SE 1 foot at 8 seconds. Patchy fog. A chance of showers in the afternoon. Vsby 1 NM or less, increasing to 1 to 3 NM in the afternoon. .THU NIGHT...SW winds 5 to 10 kt, becoming N after midnight. Seas 1 foot or less, then around 2 ft after midnight. Wave Detail: SW 1 foot at 4 seconds and SE 1 foot at 8 seconds, becoming W 1 foot at 4 seconds and E 1 foot at 8 seconds. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or less after midnight. .FRI...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: NE 2 ft at 3 seconds and SW 1 foot at 5 seconds. .FRI NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft. Wave Detail: NE 2 ft at 3 seconds and S 1 foot at 5 seconds. .SAT AND SAT NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE 1 foot at 2 seconds and S 1 foot at 5 seconds. .SUN THROUGH MON...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. .MON NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-141800- Rhode Island Sound- 104 AM EDT Thu Aug 14 2025 .REST OF TONIGHT...SW winds around 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. Patchy fog. A slight chance of showers and tstms. Vsby 1 NM or less. .THU...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 9 seconds. Patchy fog. A chance of showers in the afternoon. Vsby 1 NM or less, increasing to 1 to 3 NM in the afternoon. .THU NIGHT...S winds around 5 kt, becoming N after midnight. Seas around 2 ft. Wave Detail: SE 2 ft at 9 seconds and S 1 foot at 4 seconds. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or less after midnight. .FRI...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 5 seconds and S 1 foot at 5 seconds. .FRI NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 2 to 3 ft. Wave Detail: E 3 ft at 5 seconds and S 1 foot at 6 seconds. .SAT AND SAT NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE 2 ft at 5 seconds and S 1 foot at 5 seconds. .SUN THROUGH MON NIGHT...E winds 15 to 20 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. $$ ANZ237-141800- Block Island Sound- 104 AM EDT Thu Aug 14 2025 .REST OF TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. Patchy fog. A chance of showers with a slight chance of tstms. Vsby 1 to 3 NM. .THU...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. A chance of showers. Patchy fog in the morning with vsby 1 to 3 NM. .THU NIGHT...S winds around 5 kt, becoming N after midnight. Seas around 2 ft. Wave Detail: E 2 ft at 9 seconds and SW 1 foot at 4 seconds. .FRI...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: NE 2 ft at 6 seconds and S 1 foot at 5 seconds. .FRI NIGHT...E winds 10 to 15 kt with gusts up to 20 kt, becoming NE 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave Detail: E 2 ft at 5 seconds and S 1 foot at 6 seconds. .SAT AND SAT NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 5 seconds and S 1 foot at 5 seconds. .SUN THROUGH MON NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-141800- Boston Harbor- 104 AM EDT Thu Aug 14 2025 .REST OF TONIGHT...SW winds 5 to 10 kt. Waves 1 foot or less. .THU...SW winds 5 to 10 kt, becoming SE in the afternoon. Waves 1 foot or less. A chance of showers and tstms in the afternoon. .THU NIGHT...NE winds 5 to 10 kt, becoming N 10 to 15 kt after midnight. Waves 1 foot or less, then around 2 ft after midnight. .FRI...NE winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. .FRI NIGHT...NE winds 5 to 10 kt. Waves around 2 ft in the evening, then 1 foot or less. .SAT AND SAT NIGHT...SW winds 5 to 10 kt. Waves around 2 ft. .SUN...SW winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. .SUN NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. A chance of showers. .MON AND MON NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt, becoming E 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. $$ ANZ236-141800- Narragansett Bay- 104 AM EDT Thu Aug 14 2025 .REST OF TONIGHT...SW winds 5 to 10 kt. Waves around 2 ft. Patchy fog. A slight chance of showers. Vsby 1 to 3 NM. .THU...S winds 5 to 10 kt. Waves around 2 ft in the morning, then 1 foot or less. Patchy fog in the morning. A chance of showers and tstms in the afternoon. Vsby 1 to 3 NM in the morning. .THU NIGHT...SE winds around 5 kt, becoming N after midnight. Waves 1 foot or less. .FRI...NE winds 10 to 15 kt. Waves around 2 ft. .FRI NIGHT...NE winds 5 to 10 kt. Waves around 2 ft. .SAT AND SAT NIGHT...SW winds 5 to 10 kt. Waves around 2 ft. .SUN THROUGH MON NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. Winds and waves higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ For the latest updates...please visit our webpage at www.weather.gov/boston You can follow us on Facebook at www.facebook.com/NWSBoston You can follow us on Twitter at @NWSBoston