


Coastal Waters Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
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610 FZUS51 KBOX 240205 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 1005 PM EDT Wed Jul 23 2025 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-241500- 1005 PM EDT Wed Jul 23 2025 .Synopsis for Massachusetts and Rhode Island coastal waters... High pres moves offshore into Thu. A weak front will move into New Eng on Fri, crossing the waters Fri night into Sat. Low pressure crosses the waters Monday. $$ ANZ250-241500- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 1005 PM EDT Wed Jul 23 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM THURSDAY AFTERNOON THROUGH FRIDAY MORNING... .OVERNIGHT...S winds 15 to 20 kt, becoming SW 10 to 15 kt. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and SE 1 foot at 8 seconds. .THU...SW winds 10 to 15 kt with gusts up to 20 kt, becoming S 15 to 20 kt with gusts up to 30 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 8 seconds. .THU NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 4 seconds and SE 1 foot at 8 seconds. .FRI...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 8 seconds. A chance of showers in the afternoon. .FRI NIGHT...SW winds 10 to 15 kt, becoming NW after midnight. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 5 seconds and NW 2 ft at 3 seconds. A chance of showers in the evening. .SAT AND SAT NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: N 2 ft at 4 seconds and S 1 foot at 6 seconds. .SUN...SE winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. .SUN NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. .MON AND MON NIGHT...NE winds 10 to 15 kt, becoming S. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-241500- Massachusetts Bay and Ipswich Bay- 1005 PM EDT Wed Jul 23 2025 .OVERNIGHT...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and E 1 foot at 3 seconds. .THU...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and SE 1 foot at 3 seconds. .THU 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 8 seconds. .FRI...SW winds around 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. A chance of showers in the afternoon. .FRI NIGHT...SW winds 10 to 15 kt, becoming NW after midnight. Gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 9 seconds. A chance of showers in the evening. .SAT AND SAT NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: N 2 ft at 3 seconds and S 1 foot at 5 seconds. .SUN...S winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. .SUN NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of showers. .MON AND MON NIGHT...NE winds around 10 kt, becoming S. 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. $$ ANZ231-241500- Cape Cod Bay- 1005 PM EDT Wed Jul 23 2025 .OVERNIGHT...S winds around 10 kt. Seas around 2 ft. Wave Detail: S 1 foot at 2 seconds and SE 1 foot at 8 seconds. .THU...SW winds around 10 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 2 ft at 3 seconds and SE 1 foot at 8 seconds. .THU NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: SW 2 ft at 3 seconds and SE 1 foot at 7 seconds. .FRI...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. A chance of showers in the afternoon. .FRI NIGHT...SW winds 15 to 20 kt, becoming NW 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 9 seconds. A chance of showers in the evening. .SAT AND SAT NIGHT...SE winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: N 2 ft at 3 seconds and S 1 foot at 6 seconds. .SUN...SE winds 5 to 10 kt with gusts up to 20 kt. Seas around 2 ft. .SUN NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of showers. .MON AND MON NIGHT...N winds around 10 kt with gusts up to 20 kt, becoming SW. Seas around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-241500- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 1005 PM EDT Wed Jul 23 2025 .OVERNIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds and SE 1 foot at 8 seconds. .THU...SW winds 10 to 15 kt, becoming S 15 to 20 kt in the afternoon. 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. .THU 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. .FRI...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and SE 1 foot at 8 seconds. A chance of showers in the afternoon. .FRI NIGHT...SW winds 15 to 20 kt, becoming W 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and SE 1 foot at 9 seconds. A chance of showers in the evening. .SAT AND SAT NIGHT...E 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 S 2 ft at 6 seconds. .SUN...SE winds 5 to 10 kt. Seas around 2 ft. .SUN NIGHT...S winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers. .MON AND MON NIGHT...N winds 10 to 15 kt, becoming SW. 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. $$ ANZ255-241500- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 1005 PM EDT Wed Jul 23 2025 .OVERNIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds and SE 1 foot at 8 seconds. .THU...SW winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: S 2 ft at 6 seconds and SW 1 foot at 3 seconds. .THU NIGHT...SW winds around 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 5 seconds. .FRI...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and SE 1 foot at 8 seconds. A chance of showers in the afternoon. .FRI NIGHT...SW winds 15 to 20 kt, becoming W 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and SE 1 foot at 9 seconds. A chance of showers in the evening. .SAT AND SAT NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 6 seconds and N 2 ft at 4 seconds. .SUN...SE winds around 10 kt. Seas 2 to 3 ft. .SUN NIGHT...S winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers. .MON AND MON NIGHT...N winds 10 to 15 kt with gusts up to 20 kt, becoming W. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-241500- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 1005 PM EDT Wed Jul 23 2025 .OVERNIGHT...S winds 10 to 15 kt. Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds and SE 1 foot at 8 seconds. .THU...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 2 ft at 7 seconds. .THU NIGHT...SW winds 15 to 20 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 6 seconds. .FRI...SW winds 15 to 20 kt with gusts up to 25 kt. Seas around 4 ft. Wave Detail: SW 4 ft at 6 seconds and SE 1 foot at 9 seconds. A chance of showers in the afternoon. .FRI NIGHT...SW winds 15 to 20 kt, becoming NW 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 6 seconds and SE 1 foot at 9 seconds. A chance of showers in the evening. .SAT AND SAT NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: N 3 ft at 4 seconds and SW 3 ft at 6 seconds. .SUN...SE winds 10 to 15 kt. Seas 2 to 3 ft. .SUN NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers. .MON AND MON NIGHT...NW winds 10 to 15 kt, becoming SW. 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. $$ ANZ232-241500- Nantucket Sound- 1005 PM EDT Wed Jul 23 2025 .OVERNIGHT...SW winds 10 to 15 kt. Seas 1 foot or less. Wave Detail: SW 1 foot at 3 seconds and SE 1 foot at 8 seconds. .THU...SW winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 7 seconds. .THU NIGHT...SW winds 15 to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 7 seconds. .FRI...SW winds 15 to 20 kt with gusts up to 25 kt. Seas around 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 8 seconds. A chance of showers in the afternoon. .FRI NIGHT...SW winds 15 to 20 kt, becoming NW 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: W 3 ft at 4 seconds and SE 1 foot at 9 seconds. A chance of showers in the evening. .SAT AND SAT NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: N 2 ft at 3 seconds and SW 1 foot at 6 seconds. .SUN...SE winds 10 to 15 kt. Seas around 2 ft. .SUN NIGHT...SW winds 10 to 15 kt. Seas around 2 ft. A chance of showers. .MON AND MON NIGHT...N winds 10 to 15 kt with gusts up to 20 kt, becoming SW. Seas around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-241500- Vineyard Sound- 1005 PM EDT Wed Jul 23 2025 .OVERNIGHT...S winds around 10 kt. Seas around 2 ft. Wave Detail: S 1 foot at 3 seconds and SE 1 foot at 8 seconds. .THU...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 7 seconds. .THU NIGHT...SW winds 15 to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 7 seconds. .FRI...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 9 seconds. A chance of showers in the afternoon. .FRI NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt, becoming NW 10 to 15 kt after midnight. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 5 seconds and SE 1 foot at 9 seconds. A chance of showers in the evening. .SAT AND SAT NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and SW 2 ft at 6 seconds. .SUN...SE winds 5 to 10 kt. Seas around 2 ft. .SUN NIGHT...SW winds 10 to 15 kt. Seas around 2 ft. A chance of showers. .MON AND MON NIGHT...NW winds 10 to 15 kt, becoming SW. 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. $$ ANZ234-241500- Buzzards Bay- 1005 PM EDT Wed Jul 23 2025 .OVERNIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SW 1 foot at 3 seconds and SE 1 foot at 8 seconds. .THU...SW winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas around 2 ft, building to 3 to 4 ft in the afternoon. Wave Detail: SW 1 foot at 3 seconds and SE 1 foot at 7 seconds, becoming SW 2 ft at 4 seconds and SE 1 foot at 7 seconds. .THU NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 7 seconds. .FRI...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 8 seconds. A chance of showers in the afternoon. .FRI NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt, becoming NW 10 to 15 kt after midnight. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 5 seconds and SE 1 foot at 9 seconds. A chance of showers in the evening. .SAT AND SAT NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and SW 2 ft at 6 seconds. .SUN...SE winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. .SUN NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of showers. .MON AND MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt, becoming SW. Seas around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-241500- Rhode Island Sound- 1005 PM EDT Wed Jul 23 2025 .OVERNIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. .THU...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 SE 1 foot at 7 seconds. .THU NIGHT...SW winds 15 to 20 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 5 seconds. .FRI...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and SE 1 foot at 9 seconds. A chance of showers in the afternoon. .FRI NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt, becoming NW 10 to 15 kt after midnight. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and SE 1 foot at 9 seconds. A chance of showers in the evening. .SAT AND SAT NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 6 seconds and N 2 ft at 3 seconds. .SUN...SE winds 5 to 10 kt. Seas around 2 ft. .SUN NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers. .MON AND MON NIGHT...NW winds 10 to 15 kt, becoming SW. 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. $$ ANZ237-241500- Block Island Sound- 1005 PM EDT Wed Jul 23 2025 .OVERNIGHT...SW winds around 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds and SE 1 foot at 8 seconds. .THU...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 7 seconds. .THU NIGHT...SW winds around 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 5 seconds. .FRI...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and W 1 foot at 4 seconds. A chance of showers in the afternoon. .FRI NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt, becoming NW after midnight. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 5 seconds and SE 1 foot at 9 seconds. A chance of showers in the evening. .SAT AND SAT NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: N 2 ft at 3 seconds and S 2 ft at 6 seconds. .SUN...SE winds 5 to 10 kt. Seas around 2 ft. .SUN NIGHT...SW winds around 10 kt. Seas around 2 ft. A chance of showers. .MON AND MON NIGHT...NW winds around 10 kt, becoming SW. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-241500- Boston Harbor- 1005 PM EDT Wed Jul 23 2025 .OVERNIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. .THU...SW winds 10 to 15 kt. Gusts up to 25 kt in the afternoon. Waves around 2 ft. .THU NIGHT...SW winds around 15 kt with gusts up to 25 kt. Waves around 2 ft. .FRI...SW winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. A chance of showers and tstms in the afternoon. Some tstms may produce gusty winds and heavy rainfall in the afternoon. .FRI NIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming NW after midnight. Waves around 2 ft. A chance of showers and tstms in the evening. Some tstms may produce gusty winds and heavy rainfall in the evening. .SAT AND SAT NIGHT...S winds 5 to 10 kt. Waves around 2 ft. .SUN AND SUN NIGHT...S winds 10 to 15 kt, becoming SW. Gusts up to 20 kt. Waves around 2 ft. A chance of showers. .MON AND MON NIGHT...NE winds around 10 kt, becoming S. Waves around 2 ft, then 1 foot or less. 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. $$ ANZ236-241500- Narragansett Bay- 1005 PM EDT Wed Jul 23 2025 .OVERNIGHT...SW winds 5 to 10 kt. Waves around 2 ft. .THU...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 25 kt in the afternoon. Waves 2 to 3 ft. .THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. .FRI...SW winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 3 ft. A chance of showers in the afternoon. .FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt, becoming NW after midnight. Waves 2 to 3 ft. A chance of showers in the evening. .SAT AND SAT NIGHT...SE winds 10 to 15 kt. Waves around 2 ft. .SUN...SE winds 5 to 10 kt. Waves around 2 ft. .SUN NIGHT...SW winds around 10 kt. Waves around 2 ft. A chance of showers. .MON AND MON NIGHT...NW winds around 10 kt, becoming SW. Waves around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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