Coastal Waters Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
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221 FZUS51 KBOX 241804 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 104 PM EST Mon Nov 24 2025 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-250700- 104 PM EST Mon Nov 24 2025 .Synopsis for Massachusetts and Rhode Island coastal waters... An area of high pressure builds over the waters late today before moving Tuesday. A warm front lifts north across the region Tuesday night followed by a strong cold front Wednesday night. Gusty post frontal westerly winds develop Thursday through Saturday morning, which may gust to Gale Force as strong low pressure moves into the Maritimes. $$ ANZ250-250700- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 104 PM EST Mon Nov 24 2025 .THIS AFTERNOON...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: NW 3 ft at 4 seconds and E 1 foot at 10 seconds. .TONIGHT...NW winds 10 to 15 kt with gusts up to 20 kt, becoming SW after midnight. Seas 2 to 3 ft. Wave Detail: NW 3 ft at 4 seconds and E 1 foot at 9 seconds. .TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and N 1 foot at 4 seconds. .TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 4 seconds and E 1 foot at 9 seconds. Patchy fog. Rain. Vsby 1 to 3 NM. .WED...S winds 10 to 15 kt. Gusts up to 20 kt in the morning. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and SE 2 ft at 9 seconds. Rain likely, mainly in the morning. Vsby 1 to 3 NM. .WED NIGHT...S winds 10 to 15 kt, becoming SW 15 to 20 kt after midnight. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and SE 3 ft at 8 seconds. A chance of rain. Vsby 1 to 3 NM in the evening. .THU...W winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft. .THU NIGHT THROUGH FRI NIGHT...W winds 25 to 30 kt with gusts up to 40 kt. Seas 5 to 7 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-250700- Massachusetts Bay and Ipswich Bay- 104 PM EST Mon Nov 24 2025 .THIS AFTERNOON...NW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 10 seconds. .TONIGHT...W winds 5 to 10 kt, becoming SW after midnight. Seas around 2 ft. Wave Detail: N 2 ft at 3 seconds and E 1 foot at 9 seconds. .TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and NE 1 foot at 4 seconds. .TUE NIGHT...S winds 10 to 15 kt. Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds and E 1 foot at 9 seconds. Patchy fog. Rain. Vsby 1 to 3 NM. .WED...S winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 4 seconds and E 1 foot at 9 seconds. Rain likely, mainly in the morning. Vsby 1 to 3 NM. .WED NIGHT...S winds 10 to 15 kt, becoming W 15 to 20 kt after midnight. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and SE 1 foot at 4 seconds. A chance of rain. Vsby 1 to 3 NM in the evening. .THU THROUGH FRI NIGHT...W winds 25 to 30 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. $$ ANZ231-250700- Cape Cod Bay- 104 PM EST Mon Nov 24 2025 .THIS AFTERNOON...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: N 3 ft at 4 seconds and E 1 foot at 9 seconds. .TONIGHT...NW winds 5 to 10 kt, becoming SW after midnight. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 9 seconds. .TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and N 1 foot at 4 seconds. .TUE NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas around 2 ft. Wave Detail: SE 2 ft at 4 seconds and E 1 foot at 9 seconds. Patchy fog. Rain. Vsby 1 to 3 NM. .WED...S winds 10 to 15 kt. Gusts up to 20 kt in the morning. Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds and SE 1 foot at 9 seconds. Rain likely. Vsby 1 to 3 NM. .WED NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and S 2 ft at 8 seconds. A chance of rain. Vsby 1 to 3 NM in the evening. .THU THROUGH FRI NIGHT...W winds 25 to 30 kt with gusts up to 35 kt. Seas 3 to 5 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-250700- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 104 PM EST Mon Nov 24 2025 .THIS AFTERNOON...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: N 3 ft at 4 seconds and E 2 ft at 9 seconds. .TONIGHT...NW 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: N 3 ft at 4 seconds and E 1 foot at 9 seconds. .TUE...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 NE 1 foot at 4 seconds. .TUE 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 NE 1 foot at 5 seconds. A chance of rain in the evening, then rain after midnight. Patchy fog after midnight. Vsby 1 to 3 NM. .WED...S winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 4 ft at 5 seconds and SE 3 ft at 9 seconds. Rain likely. Vsby 1 to 3 NM. .WED NIGHT...SW winds 10 to 15 kt, increasing to 15 to 20 kt after midnight. Gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: S 5 ft at 7 seconds. Rain likely, mainly in the evening. Patchy fog in the evening with vsby 1 to 3 NM. .THU...W winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 7 ft. .THU NIGHT THROUGH FRI NIGHT...W winds 25 to 30 kt with gusts up to 35 kt. Seas 6 to 9 ft, except 9 to 13 ft S and E of Nantucket. 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. $$ ANZ255-250700- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 104 PM EST Mon Nov 24 2025 .THIS AFTERNOON...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: NW 4 ft at 5 seconds and SE 1 foot at 9 seconds. .TONIGHT...NW winds 5 to 10 kt, becoming W after midnight. Seas 2 to 3 ft. Wave Detail: W 3 ft at 6 seconds and N 1 foot at 4 seconds. .TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 5 seconds and N 1 foot at 4 seconds. .TUE NIGHT...S winds 10 to 15 kt, increasing to 15 to 20 kt after midnight. Gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: S 5 ft at 5 seconds and E 1 foot at 9 seconds. A chance of rain in the evening, then rain after midnight. Patchy fog after midnight. Vsby 1 to 3 NM. .WED...S winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: SW 6 ft at 7 seconds and S 5 ft at 9 seconds. Rain likely. Vsby 1 to 3 NM. .WED NIGHT...SW winds 15 to 20 kt, becoming W 20 to 25 kt after midnight. Gusts up to 30 kt. Seas 4 to 5 ft, building to 5 to 7 ft after midnight. Wave Detail: SW 5 ft at 6 seconds, becoming SW 7 ft at 6 seconds. Rain likely, mainly in the evening with vsby 1 to 3 NM. .THU...W winds 25 to 30 kt with gusts up to 35 kt. Seas 7 to 10 ft. .THU NIGHT AND FRI...W winds 30 to 40 kt. Seas 9 to 13 ft. .FRI NIGHT...NW winds 30 to 40 kt with gusts up to 45 kt. Seas 8 to 11 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-250700- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 104 PM EST Mon Nov 24 2025 .THIS AFTERNOON...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: NW 4 ft at 5 seconds and SE 1 foot at 9 seconds. .TONIGHT...NW winds 5 to 10 kt, becoming W after midnight. Seas 2 to 3 ft. Wave Detail: N 3 ft at 4 seconds and SE 1 foot at 9 seconds. .TUE...SW winds 15 to 20 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and N 1 foot at 3 seconds. .TUE 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: SW 3 ft at 5 seconds and SE 1 foot at 9 seconds, becoming S 5 ft at 6 seconds and E 1 foot at 9 seconds. Patchy fog. Rain. Vsby 1 to 3 NM. .WED...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: SW 5 ft at 6 seconds and S 5 ft at 9 seconds. Rain likely. Vsby 1 to 3 NM. .WED NIGHT...SW winds 15 to 20 kt, becoming W 20 to 25 kt after midnight. Gusts up to 30 kt. Seas 4 to 5 ft, building to 5 to 7 ft after midnight. Wave Detail: S 5 ft at 7 seconds and SW 1 foot at 3 seconds, becoming SW 7 ft at 6 seconds. A chance of rain. Vsby 1 to 3 NM in the evening. .THU...W winds 25 to 30 kt with gusts up to 35 kt. Seas 7 to 10 ft. .THU NIGHT AND FRI...W winds 30 to 40 kt. Seas 9 to 12 ft. .FRI NIGHT...W winds 30 to 40 kt with gusts up to 45 kt. Seas 7 to 10 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. $$ ANZ232-250700- Nantucket Sound- 104 PM EST Mon Nov 24 2025 .THIS AFTERNOON...NW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and SE 1 foot at 9 seconds. .TONIGHT...NW winds 5 to 10 kt, becoming W after midnight. Seas around 2 ft in the evening, then 1 foot or less. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 9 seconds, becoming W 1 foot at 3 seconds and NE 1 foot at 4 seconds. .TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and NE 1 foot at 4 seconds. .TUE NIGHT...S winds 10 to 15 kt, increasing to 15 to 20 kt after midnight. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and NE 1 foot at 4 seconds. Patchy fog. Rain. Vsby 1 to 3 NM. .WED...S winds 15 to 20 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and S 2 ft at 9 seconds. Rain likely. Vsby 1 to 3 NM. .WED NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and S 2 ft at 8 seconds. Rain likely, mainly in the evening with vsby 1 to 3 NM. .THU...W winds 25 to 30 kt. Seas 4 to 6 ft. .THU NIGHT THROUGH FRI NIGHT...W winds 25 to 35 kt with gusts up to 40 kt. Seas 5 to 7 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-250700- Vineyard Sound- 104 PM EST Mon Nov 24 2025 .THIS AFTERNOON...NW winds around 10 kt. Seas around 2 ft. Wave Detail: NW 2 ft at 5 seconds and SE 1 foot at 9 seconds. .TONIGHT...NW winds 5 to 10 kt, becoming W after midnight. Seas around 2 ft in the evening, then 1 foot or less. Wave Detail: NW 2 ft at 4 seconds and SE 1 foot at 9 seconds, becoming N 1 foot at 3 seconds and W 1 foot at 4 seconds. .TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 5 seconds and N 1 foot at 4 seconds. .TUE 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 5 seconds and SE 1 foot at 9 seconds. Patchy fog. Rain. Vsby 1 to 3 NM. .WED...SW winds 15 to 20 kt. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 6 seconds and SE 3 ft at 9 seconds. Rain likely. Vsby 1 to 3 NM. .WED NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft, building to 3 to 5 ft after midnight. Wave Detail: SW 3 ft at 6 seconds, becoming SW 5 ft at 6 seconds. A chance of rain. Vsby 1 to 3 NM in the evening. .THU...W winds 25 to 30 kt. Seas 4 to 6 ft. .THU NIGHT THROUGH FRI NIGHT...W winds 25 to 35 kt. Seas 5 to 8 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. $$ ANZ234-250700- Buzzards Bay- 104 PM EST Mon Nov 24 2025 .THIS AFTERNOON...NW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: N 2 ft at 5 seconds and SE 1 foot at 9 seconds. .TONIGHT...NW winds 5 to 10 kt, becoming W after midnight. Seas 1 foot or less. Wave Detail: NW 1 foot at 4 seconds and SE 1 foot at 9 seconds. .TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and N 1 foot at 4 seconds. .TUE NIGHT...S winds 10 to 15 kt, increasing to 15 to 20 kt after midnight. Seas 2 to 3 ft. Wave Detail: S 3 ft at 5 seconds and SE 1 foot at 9 seconds. Patchy fog. Rain. Vsby 1 to 3 NM. .WED...SW winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 5 seconds and SE 3 ft at 9 seconds. Rain likely. Vsby 1 to 3 NM. .WED NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 7 seconds and SW 3 ft at 4 seconds. A chance of rain. Vsby 1 to 3 NM in the evening. .THU...W winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 5 ft. .THU NIGHT AND FRI...W winds 25 to 30 kt with gusts up to 35 kt. Seas 4 to 6 ft. .FRI NIGHT...W winds 25 to 30 kt. Seas 3 to 5 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-250700- Rhode Island Sound- 104 PM EST Mon Nov 24 2025 .THIS AFTERNOON...NW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: N 3 ft at 4 seconds and SE 1 foot at 9 seconds. .TONIGHT...NW winds 5 to 10 kt, becoming W after midnight. Seas around 2 ft. Wave Detail: NW 2 ft at 4 seconds and SE 1 foot at 9 seconds. .TUE...SW winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and N 1 foot at 3 seconds. .TUE NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 4 ft at 5 seconds and SE 1 foot at 8 seconds. Patchy fog. Rain. Vsby 1 to 3 NM. .WED...SW winds 15 to 20 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 6 seconds and S 4 ft at 9 seconds. Rain likely. Vsby 1 to 3 NM. .WED NIGHT...SW winds 15 to 20 kt, becoming W 20 to 25 kt after midnight. Seas 3 to 4 ft, building to 4 to 6 ft after midnight. Wave Detail: SW 4 ft at 6 seconds, becoming SW 6 ft at 6 seconds. A chance of rain. Vsby 1 to 3 NM in the evening. .THU...W winds 25 to 30 kt. Seas 5 to 7 ft. .THU NIGHT AND FRI...W winds 25 to 35 kt. Seas 6 to 9 ft. .FRI NIGHT...W winds 25 to 30 kt with gusts up to 35 kt. Seas 5 to 7 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. $$ ANZ237-250700- Block Island Sound- 104 PM EST Mon Nov 24 2025 .THIS AFTERNOON...NW winds around 10 kt. Seas around 2 ft. Wave Detail: NW 2 ft at 4 seconds and SE 1 foot at 8 seconds. .TONIGHT...NW winds 5 to 10 kt, becoming W after midnight. Seas around 2 ft in the evening, then 1 foot or less. Wave Detail: NW 1 foot at 3 seconds and SE 1 foot at 9 seconds, becoming N 1 foot at 2 seconds and W 1 foot at 3 seconds. .TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and SE 1 foot at 9 seconds. A chance of rain in the afternoon. .TUE NIGHT...S winds 10 to 15 kt, increasing to 15 to 20 kt after midnight. Seas 2 to 4 ft. Wave Detail: S 3 ft at 5 seconds and SE 1 foot at 9 seconds. Patchy fog. Rain. Vsby 1 to 3 NM. .WED...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 9 seconds and SW 3 ft at 6 seconds. Rain likely. Vsby 1 to 3 NM. .WED NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: SW 4 ft at 6 seconds. A chance of rain. Vsby 1 to 3 NM in the evening. .THU THROUGH FRI...W winds 25 to 30 kt with gusts up to 35 kt. Seas 5 to 8 ft. .FRI NIGHT...W winds 25 to 30 kt with gusts up to 35 kt. Seas 4 to 6 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-250700- Boston Harbor- 104 PM EST Mon Nov 24 2025 .THIS AFTERNOON...NW winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. .TONIGHT...W winds 5 to 10 kt, becoming SW after midnight. Waves 1 foot or less. .TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. .TUE NIGHT...S winds around 10 kt. Waves 1 foot or less, then around 2 ft after midnight. Patchy fog. Rain. Vsby 1 to 3 NM. .WED...S winds around 10 kt. Waves 1 foot or less. Rain likely, mainly in the morning. Vsby 1 to 3 NM. .WED NIGHT...SW winds 10 to 15 kt, becoming W 15 to 20 kt after midnight. Waves around 2 ft. A chance of rain. .THU THROUGH FRI NIGHT...W winds 25 to 30 kt. Waves 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. $$ ANZ236-250700- Narragansett Bay- 104 PM EST Mon Nov 24 2025 .THIS AFTERNOON...NW winds 5 to 10 kt. Waves around 2 ft. .TONIGHT...W winds 5 to 10 kt. Waves 1 foot or less. .TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. .TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. Patchy fog. Rain. Vsby 1 to 3 NM. .WED...SW winds 10 to 15 kt. Gusts up to 20 kt in the morning. Waves 2 to 3 ft. Rain likely, mainly in the morning. Vsby 1 to 3 NM. .WED NIGHT...SW winds 10 to 15 kt, becoming W 15 to 20 kt after midnight. Waves 2 to 3 ft. A chance of rain. .THU...W winds 15 to 20 kt with gusts up to 30 kt. Waves 2 to 4 ft. .THU NIGHT AND FRI...W winds 20 to 25 kt with gusts up to 30 kt. Waves 3 to 5 ft. .FRI NIGHT...W winds 20 to 25 kt with gusts up to 30 kt. Waves 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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