


Coastal Waters Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
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873 FZUS51 KBOX 041703 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 103 PM EDT Thu Sep 4 2025 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-050600- 103 PM EDT Thu Sep 4 2025 .Synopsis for Massachusetts and Rhode Island coastal waters... Area of high pressure moves east of the coastal waters today with increasing S to SE winds with occasional gusts less than 25 knots. Seas today are increasing 3-4 feet. A few showers are possible overnight into Friday morning and areas or marine fog. Wind shifts to the SSW for Friday with gusts nearing advisory criteria. A cold front moves across the waters Saturday night through Sunday, which the front could become quasi-stationary over the eastern waters. An area of high pressure returns late Sunday and remains through Wednesday. $$ ANZ250-050600- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 103 PM EDT Thu Sep 4 2025 .THIS AFTERNOON...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and S 2 ft at 3 seconds. .TONIGHT...S winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 4 seconds and E 3 ft at 8 seconds. Patchy fog. Vsby 1 NM or less. .FRI...S winds 15 to 20 kt. Gusts up to 20 kt, increasing to 30 kt in the afternoon. Seas 3 to 5 ft. Wave Detail: S 3 ft at 4 seconds and E 3 ft at 8 seconds. Patchy fog in the morning with vsby 1 NM or less. .FRI NIGHT...S winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: S 3 ft at 4 seconds and SE 3 ft at 7 seconds. .SAT...S winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 4 seconds and SE 3 ft at 8 seconds. .SAT NIGHT...S winds 15 to 20 kt, becoming SW 10 to 15 kt after midnight. Gusts up to 30 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 4 seconds and SE 3 ft at 7 seconds. A chance of showers in the evening, then showers likely after midnight. .SUN...N winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Showers likely. .SUN NIGHT AND MON...NW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers. .MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-050600- Massachusetts Bay and Ipswich Bay- 103 PM EDT Thu Sep 4 2025 .THIS AFTERNOON...SE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and SE 2 ft at 3 seconds. .TONIGHT...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and SE 2 ft at 4 seconds. Patchy fog after midnight with vsby 1 NM or less. .FRI...S winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and E 3 ft at 8 seconds. Patchy fog in the morning with vsby 1 to 3 NM. .FRI NIGHT...S winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 4 seconds and SE 2 ft at 8 seconds. .SAT...S winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and E 2 ft at 7 seconds. .SAT NIGHT...SW winds 15 to 20 kt, becoming W 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and SE 2 ft at 7 seconds. A chance of showers in the evening, then showers likely after midnight. .SUN...N winds around 10 kt. Seas around 2 ft. Showers likely. Vsby 1 to 3 NM. .SUN NIGHT...W winds 5 to 10 kt. Seas around 2 ft. A chance of showers. .MON AND MON NIGHT...NW winds 10 to 15 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. $$ ANZ231-050600- Cape Cod Bay- 103 PM EDT Thu Sep 4 2025 .THIS AFTERNOON...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and S 1 foot at 2 seconds. .TONIGHT...S winds around 10 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft at 8 seconds and S 1 foot at 2 seconds. Patchy fog after midnight with vsby 1 to 3 NM. .FRI...S winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 2 ft at 3 seconds and E 2 ft at 8 seconds. Patchy fog in the morning with vsby 1 to 3 NM. .FRI NIGHT...S winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 2 ft at 3 seconds and SE 2 ft at 7 seconds. .SAT...S winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 2 ft at 3 seconds and SE 2 ft at 7 seconds. .SAT NIGHT...S winds 15 to 20 kt, becoming SW 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 2 ft at 3 seconds and SE 2 ft at 7 seconds. A chance of showers. .SUN...NW winds around 10 kt. Seas around 2 ft. Showers likely. .SUN NIGHT AND MON...NW winds 5 to 10 kt. Seas around 2 ft. A chance of showers. .MON NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-050600- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 103 PM EDT Thu Sep 4 2025 .THIS AFTERNOON...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds. .TONIGHT...S winds around 10 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and S 2 ft at 3 seconds. Patchy fog. Vsby 1 to 3 NM. .FRI...S winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 4 seconds and SE 3 ft at 8 seconds. Patchy fog in the morning with vsby 1 to 3 NM. .FRI NIGHT...S winds around 15 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 5 seconds and S 3 ft at 8 seconds. .SAT...S winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 5 seconds and S 3 ft at 8 seconds. .SAT NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 5 seconds and S 3 ft at 8 seconds. A chance of showers. .SUN AND SUN NIGHT...NW winds 10 to 15 kt. Seas 2 to 4 ft. Showers likely. Vsby 1 to 3 NM. .MON...NW winds 10 to 15 kt. Seas 2 to 4 ft. A chance of showers. Vsby 1 to 3 NM. .MON NIGHT...N winds 10 to 15 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. $$ ANZ255-050600- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 103 PM EDT Thu Sep 4 2025 .THIS AFTERNOON...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds. .TONIGHT...S winds around 10 kt. Gusts up to 20 kt after midnight. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and S 2 ft at 3 seconds. Patchy fog. Vsby 1 to 3 NM. .FRI...S winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and SE 3 ft at 8 seconds. Patchy fog in the morning with vsby 1 to 3 NM. .FRI NIGHT...S winds 15 to 20 kt. Seas 4 to 5 ft. Wave Detail: S 4 ft at 5 seconds and S 4 ft at 8 seconds. .SAT...S winds around 15 kt with gusts up to 20 kt. Seas 4 to 5 ft. Wave Detail: S 4 ft at 7 seconds. .SAT NIGHT...SW winds around 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 7 seconds. A chance of showers. .SUN AND SUN NIGHT...NW winds 10 to 15 kt. Seas 3 to 4 ft. Showers likely. Vsby 1 to 3 NM. .MON...NW winds 10 to 15 kt. Seas 2 to 4 ft. A chance of showers. Vsby 1 to 3 NM. .MON NIGHT...N winds 10 to 15 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-050600- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 103 PM EDT Thu Sep 4 2025 .THIS AFTERNOON...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds. .TONIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and S 2 ft at 3 seconds. Patchy fog. Vsby 1 NM or less, increasing to 1 to 3 NM after midnight. .FRI...S winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: S 3 ft at 4 seconds and SE 3 ft at 8 seconds. Patchy fog in the morning with vsby 1 to 3 NM. .FRI NIGHT...S winds 15 to 20 kt. Seas 4 to 5 ft. Wave Detail: S 4 ft at 5 seconds and S 4 ft at 8 seconds. .SAT...S winds around 15 kt with gusts up to 20 kt. Seas 4 to 5 ft. Wave Detail: S 4 ft at 7 seconds. .SAT NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 5 ft. Wave Detail: S 4 ft at 7 seconds. A chance of showers. .SUN...N winds 10 to 15 kt. Seas 3 to 4 ft. Showers likely. .SUN NIGHT AND MON...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. A chance of showers. .MON NIGHT...N winds 10 to 15 kt with gusts up 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. $$ ANZ232-050600- Nantucket Sound- 103 PM EDT Thu Sep 4 2025 .THIS AFTERNOON...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 1 foot at 2 seconds and E 1 foot at 8 seconds. .TONIGHT...S winds around 10 kt. Gusts up to 20 kt after midnight. Seas 2 to 3 ft. Wave Detail: S 1 foot at 3 seconds and E 1 foot at 8 seconds. Patchy fog after midnight with vsby 1 to 3 NM. .FRI...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and SE 1 foot at 8 seconds. Patchy fog in the morning with vsby 1 to 3 NM. .FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 4 seconds and SE 1 foot at 7 seconds. .SAT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and SE 1 foot at 7 seconds. .SAT NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 7 seconds. A chance of showers. .SUN AND SUN NIGHT...NW winds 10 to 15 kt. Seas 2 to 3 ft. Showers likely. Vsby 1 to 3 NM. .MON...NW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers. .MON NIGHT...NW winds 10 to 15 kt. Seas around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-050600- Vineyard Sound- 103 PM EDT Thu Sep 4 2025 .THIS AFTERNOON...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 1 foot at 2 seconds and SE 1 foot at 7 seconds. .TONIGHT...S winds 5 to 10 kt. Gusts up to 20 kt after midnight. Seas around 2 ft. Wave Detail: S 1 foot at 3 seconds and SE 1 foot at 8 seconds. Patchy fog. Vsby 1 to 3 NM. .FRI...S winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 5 seconds and SE 1 foot at 8 seconds. Patchy fog in the morning. .FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 6 seconds. .SAT...S winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 6 seconds. .SAT NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 6 seconds. A chance of showers. .SUN AND SUN NIGHT...NW winds 10 to 15 kt. Seas 2 to 3 ft. Showers likely. .MON...NW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers. .MON NIGHT...NW winds 10 to 15 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. $$ ANZ234-050600- Buzzards Bay- 103 PM EDT Thu Sep 4 2025 .THIS AFTERNOON...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 1 foot at 2 seconds and SE 1 foot at 7 seconds. .TONIGHT...S winds around 10 kt. Gusts up to 20 kt after midnight. Seas around 2 ft. Wave Detail: S 1 foot at 2 seconds and SE 1 foot at 8 seconds. Patchy fog. Vsby 1 to 3 NM. .FRI...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 8 seconds. .FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 6 seconds. .SAT...S winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and S 2 ft at 7 seconds. .SAT NIGHT...SW winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 6 seconds. A chance of showers. .SUN...N winds around 10 kt. Seas around 2 ft. Showers likely. .SUN NIGHT AND MON...NW winds around 10 kt. Seas around 2 ft. A chance of showers. .MON NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-050600- Rhode Island Sound- 103 PM EDT Thu Sep 4 2025 .THIS AFTERNOON...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 7 seconds and S 1 foot at 2 seconds. .TONIGHT...S winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas 2 to 3 ft. Wave Detail: S 2 ft at 3 seconds and SE 2 ft at 8 seconds. Patchy fog. Vsby 1 NM or less, increasing to 1 to 3 NM after midnight. .FRI...S winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 4 seconds and SE 3 ft at 8 seconds. Patchy fog in the morning. .FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: S 4 ft at 6 seconds. .SAT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 7 seconds. .SAT NIGHT...S winds 15 to 20 kt, becoming SW 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 6 seconds. A chance of showers in the evening, then showers likely after midnight. .SUN...N winds 10 to 15 kt. Seas 2 to 3 ft. Showers likely. .SUN NIGHT AND MON...NW winds 10 to 15 kt. Seas 2 to 4 ft. A chance of showers. .MON NIGHT...NW winds 10 to 15 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. $$ ANZ237-050600- Block Island Sound- 103 PM EDT Thu Sep 4 2025 .THIS AFTERNOON...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 7 seconds and S 1 foot at 2 seconds. .TONIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft at 4 seconds and SE 2 ft at 8 seconds. Patchy fog. Vsby 1 to 3 NM. .FRI...S winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 5 seconds and SE 3 ft at 8 seconds. .FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: S 4 ft at 6 seconds. .SAT...S winds around 15 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 6 seconds. .SAT NIGHT...SW winds 10 to 15 kt, becoming W after midnight. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 4 ft at 6 seconds. A chance of showers in the evening, then showers likely after midnight. .SUN...N winds around 10 kt. Seas 2 to 3 ft. Showers likely. .SUN NIGHT...NW winds around 10 kt. Seas 2 to 4 ft. A chance of showers. .MON AND MON NIGHT...NW winds 10 to 15 kt. Seas 2 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-050600- Boston Harbor- 103 PM EDT Thu Sep 4 2025 .THIS AFTERNOON...SE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. .TONIGHT...S winds around 10 kt. Gusts up to 20 kt in the evening. Waves around 2 ft. Patchy fog after midnight with vsby 1 to 3 NM. .FRI...S winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Waves around 2 ft. .FRI NIGHT...S winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Gusts up to 25 kt. Waves around 2 ft. .SAT...S winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Waves around 2 ft. A chance of showers in the afternoon. .SAT NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt, becoming W 10 to 15 kt after midnight. Waves around 2 ft. A chance of showers in the evening, then showers likely after midnight. .SUN...N winds 5 to 10 kt. Waves 1 foot or less. Showers likely. .SUN NIGHT...W winds 5 to 10 kt. Waves 1 foot or less. A chance of showers. .MON AND MON NIGHT...NW winds 5 to 10 kt. Waves 1 foot or less. 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. $$ ANZ236-050600- Narragansett Bay- 103 PM EDT Thu Sep 4 2025 .THIS AFTERNOON...S winds 5 to 10 kt. Waves around 2 ft. .TONIGHT...S winds 5 to 10 kt. Gusts up to 20 kt after midnight. Waves around 2 ft. Patchy fog. Vsby 1 to 3 NM. .FRI...S winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Waves 2 to 3 ft. .FRI NIGHT...S winds 15 to 20 kt, becoming SW 10 to 15 kt after midnight. Gusts up to 25 kt. Waves 2 to 3 ft. .SAT...S winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Waves 2 to 3 ft. .SAT NIGHT...SW winds 10 to 15 kt. Gusts up to 25 kt in the evening. Waves 2 to 3 ft. A chance of showers in the evening, then showers likely after midnight. .SUN...N winds 5 to 10 kt. Waves around 2 ft. Showers likely. .SUN NIGHT...NW winds 5 to 10 kt. Waves around 2 ft. A chance of showers. .MON AND MON NIGHT...NW winds 5 to 10 kt. Waves around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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