


Coastal Waters Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
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507 FZUS51 KBOX 020505 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 104 AM EDT Sat Aug 2 2025 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-021800- 104 AM EDT Sat Aug 2 2025 .Synopsis for Massachusetts and Rhode Island coastal waters... A sprawling high pres builds across New England this weekend and lingers through most of next week. Rather tranquil marine conditions with good visibility expected. $$ ANZ250-021800- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 104 AM EDT Sat Aug 2 2025 .REST OF TONIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 6 seconds and E 1 foot at 9 seconds. .SAT...N winds around 10 kt, becoming NE in the afternoon. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and N 1 foot at 3 seconds. .SAT NIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and SE 1 foot at 7 seconds. .SUN...SW winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds and S 2 ft at 3 seconds. .SUN NIGHT THROUGH MON NIGHT...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and E 2 ft at 7 seconds. .TUE THROUGH WED NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds and SW 1 foot at 3 seconds. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-021800- Massachusetts Bay and Ipswich Bay- 104 AM EDT Sat Aug 2 2025 .REST OF TONIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds. .SAT...N winds around 10 kt, becoming E in the afternoon. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and N 1 foot at 3 seconds. .SAT NIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and S 1 foot at 2 seconds. .SUN...SW winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 3 seconds and SE 2 ft at 7 seconds. .SUN NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 4 seconds and E 2 ft at 7 seconds. .MON AND MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 4 seconds and E 2 ft at 7 seconds. .TUE THROUGH WED NIGHT...SE 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. $$ ANZ231-021800- Cape Cod Bay- 104 AM EDT Sat Aug 2 2025 .REST OF TONIGHT...N winds around 10 kt. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and SE 1 foot at 8 seconds. .SAT...N winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and N 1 foot at 4 seconds. .SAT NIGHT...SE winds around 5 kt, becoming SW after midnight. Seas around 2 ft. Wave Detail: SE 2 ft at 7 seconds and NE 1 foot at 3 seconds. .SUN...SW winds around 5 kt, becoming S 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: SE 2 ft at 7 seconds and SW 1 foot at 2 seconds. .SUN NIGHT...S winds 10 to 15 kt with gusts up to 20 kt, becoming SW 5 to 10 kt after midnight. Seas around 2 ft. Wave Detail: E 2 ft at 7 seconds and S 1 foot at 2 seconds. .MON AND MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 7 seconds and S 1 foot at 2 seconds. .TUE THROUGH WED NIGHT...E winds 5 to 10 kt. Seas around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-021800- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 104 AM EDT Sat Aug 2 2025 .REST OF TONIGHT...N winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds. .SAT...N winds 10 to 15 kt, becoming NE 5 to 10 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: E 3 ft at 7 seconds. .SAT NIGHT...SE winds around 5 kt, becoming S after midnight. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds. .SUN...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds and S 1 foot at 2 seconds. .SUN NIGHT THROUGH MON NIGHT...E winds 5 to 10 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and S 1 foot at 3 seconds. .TUE THROUGH WED NIGHT...E winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 7 seconds and S 1 foot at 8 seconds. 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. $$ ANZ255-021800- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 104 AM EDT Sat Aug 2 2025 .REST OF TONIGHT...N winds around 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: E 3 ft at 7 seconds and SE 1 foot at 9 seconds. .SAT...NE winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 7 seconds and N 1 foot at 3 seconds. .SAT NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds and NE 1 foot at 3 seconds. .SUN...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds. .SUN NIGHT THROUGH MON NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 7 seconds and SE 2 ft at 8 seconds. .TUE THROUGH WED NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: E 4 ft at 8 seconds and S 2 ft at 8 seconds. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-021800- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 104 AM EDT Sat Aug 2 2025 .REST OF TONIGHT...N winds around 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: NE 3 ft at 5 seconds and SE 1 foot at 9 seconds. .SAT...N winds 10 to 15 kt with gusts up to 20 kt, becoming E 5 to 10 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: E 3 ft at 6 seconds and SE 1 foot at 9 seconds. .SAT NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 7 seconds and NE 1 foot at 3 seconds. .SUN...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 7 seconds. .SUN NIGHT AND MON...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds. .MON NIGHT...SE winds 5 to 10 kt, becoming E after midnight. Seas around 3 ft. Wave Detail: SE 3 ft at 7 seconds and SE 1 foot at 8 seconds. .TUE THROUGH WED NIGHT...E winds 10 to 15 kt with gusts up to 20 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. $$ ANZ232-021800- Nantucket Sound- 104 AM EDT Sat Aug 2 2025 .REST OF TONIGHT...N winds 10 to 15 kt. Seas around 2 ft. Wave Detail: NE 2 ft at 4 seconds and E 1 foot at 8 seconds. .SAT...N winds 10 to 15 kt, becoming E 5 to 10 kt in the afternoon. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 7 seconds. .SAT NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas around 2 ft. Wave Detail: SE 2 ft at 7 seconds and N 1 foot at 3 seconds. .SUN...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 1 foot at 2 seconds and SE 1 foot at 7 seconds. .SUN NIGHT THROUGH MON NIGHT...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 7 seconds and SE 1 foot at 3 seconds. .TUE THROUGH WED NIGHT...E winds 10 to 15 kt. Seas around 2 ft. Wave Detail: E 2 ft at 3 seconds and E 2 ft at 7 seconds. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-021800- Vineyard Sound- 104 AM EDT Sat Aug 2 2025 .REST OF TONIGHT...N winds 10 to 15 kt. Seas around 2 ft. Wave Detail: NE 1 foot at 3 seconds and E 1 foot at 8 seconds. .SAT...N winds around 10 kt, becoming E in the afternoon. Seas around 2 ft. Wave Detail: SE 1 foot at 2 seconds and N 1 foot at 3 seconds. .SAT NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: SE 1 foot at 3 seconds and S 1 foot at 7 seconds. .SUN...SW winds around 5 kt, becoming S in the afternoon. Seas 1 foot or less, then around 2 ft in the afternoon. Wave Detail: S 1 foot at 2 seconds and SE 1 foot at 7 seconds, becoming S 1 foot at 2 seconds and E 1 foot at 7 seconds. .SUN NIGHT THROUGH MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 7 seconds and S 1 foot at 3 seconds. .TUE THROUGH WED NIGHT...E winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 7 seconds and E 1 foot at 2 seconds. 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. $$ ANZ234-021800- Buzzards Bay- 104 AM EDT Sat Aug 2 2025 .REST OF TONIGHT...N winds around 10 kt. Seas 1 foot or less. Wave Detail: N 1 foot at 3 seconds and E 1 foot at 8 seconds. .SAT...N winds around 10 kt, becoming SE in the afternoon. Seas 1 foot or less. Wave Detail: SE 1 foot at 2 seconds and N 1 foot at 3 seconds. .SAT NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: SE 1 foot at 3 seconds and N 1 foot at 3 seconds. .SUN...SW winds around 5 kt, becoming S 10 to 15 kt in the afternoon. Seas 1 foot or less, then around 2 ft in the afternoon. Wave Detail: S 1 foot at 2 seconds and S 1 foot at 7 seconds, becoming S 1 foot at 3 seconds and SE 1 foot at 7 seconds. .SUN NIGHT AND MON...S winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 7 seconds and S 1 foot at 3 seconds. .MON NIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas 1 foot or less. Wave Detail: S 1 foot at 2 seconds and SE 1 foot at 7 seconds. .TUE THROUGH WED NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-021800- Rhode Island Sound- 104 AM EDT Sat Aug 2 2025 .REST OF TONIGHT...N winds 10 to 15 kt. Seas around 2 ft. Wave Detail: NE 2 ft at 4 seconds and SE 1 foot at 9 seconds. .SAT...N winds 10 to 15 kt, becoming SE 5 to 10 kt in the afternoon. Seas around 2 ft. Wave Detail: N 2 ft at 3 seconds and SE 1 foot at 2 seconds. .SAT NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 1 foot at 3 seconds and S 1 foot at 7 seconds. .SUN...SW winds 5 to 10 kt, becoming S in the afternoon. Seas around 2 ft. Wave Detail: SE 2 ft at 7 seconds and S 1 foot at 3 seconds. .SUN NIGHT AND MON...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and S 1 foot at 3 seconds. .MON NIGHT...S winds 5 to 10 kt, becoming NE after midnight. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds. .TUE THROUGH WED NIGHT...E 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. $$ ANZ237-021800- Block Island Sound- 104 AM EDT Sat Aug 2 2025 .REST OF TONIGHT...N winds around 10 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft at 5 seconds and SE 1 foot at 8 seconds. .SAT...N winds 5 to 10 kt, becoming SE in the afternoon. Seas around 2 ft. Wave Detail: NE 2 ft at 5 seconds and E 1 foot at 8 seconds. .SAT NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 1 foot at 7 seconds. .SUN...W winds around 5 kt, becoming S in the afternoon. Seas around 2 ft. Wave Detail: SE 2 ft at 7 seconds and S 1 foot at 2 seconds. .SUN NIGHT AND MON...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and S 1 foot at 2 seconds. .MON NIGHT...S winds 5 to 10 kt, becoming N after midnight. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds. .TUE THROUGH WED NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-021800- Boston Harbor- 104 AM EDT Sat Aug 2 2025 .REST OF TONIGHT...NW winds 5 to 10 kt. Waves 1 foot or less. .SAT...N winds 5 to 10 kt, becoming E in the afternoon. Waves 1 foot or less. .SAT NIGHT...S winds 5 to 10 kt, becoming SW after midnight. Waves 1 foot or less. .SUN...SW winds around 5 kt, becoming SE in the afternoon. Waves 1 foot or less, then around 2 ft in the afternoon. .SUN NIGHT...S winds 10 to 15 kt, becoming SW 5 to 10 kt after midnight. Waves around 2 ft in the evening, then 1 foot or less. .MON AND MON NIGHT...S winds 5 to 10 kt. Waves 1 foot or less. .TUE THROUGH WED NIGHT...SE 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. $$ ANZ236-021800- Narragansett Bay- 104 AM EDT Sat Aug 2 2025 .REST OF TONIGHT...N winds 5 to 10 kt. Waves around 2 ft. .SAT...N winds 5 to 10 kt, becoming SE in the afternoon. Waves 1 foot or less. .SAT NIGHT...S winds 5 to 10 kt. Waves 1 foot or less. .SUN...W winds around 5 kt, becoming S in the afternoon. Waves 1 foot or less, then around 2 ft in the afternoon. .SUN NIGHT...S winds 5 to 10 kt. Waves around 2 ft in the evening, then 1 foot or less. .MON AND MON NIGHT...W winds 5 to 10 kt. Waves around 2 ft. .TUE THROUGH WED NIGHT...E winds 5 to 10 kt. Waves around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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