


Coastal Waters Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
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735 FZUS51 KBOX 161104 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 703 AM EDT Thu Oct 16 2025 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-170000- 703 AM EDT Thu Oct 16 2025 .Synopsis for Massachusetts and Rhode Island coastal waters... High pres builds into western New England, and NW winds strengthen again to gale force on the eastern waters Today into Fri with light ocean effect showers. $$ ANZ250-170000- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 703 AM EDT Thu Oct 16 2025 ...GALE WARNING IN EFFECT THROUGH FRIDAY MORNING... .TODAY...N winds 20 to 25 kt with gusts up to 35 kt. Seas 6 to 8 ft. Wave Detail: N 7 ft at 7 seconds and SE 4 ft at 10 seconds. .TONIGHT...N winds 25 to 30 kt with gusts up to 40 kt. Seas 6 to 9 ft. Wave Detail: N 9 ft at 7 seconds and SE 2 ft at 9 seconds. .FRI...N winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Gusts up to 30 kt. Seas 6 to 9 ft. Wave Detail: N 9 ft at 7 seconds and SE 1 foot at 9 seconds. .FRI NIGHT...N winds 15 to 20 kt with gusts up to 25 kt. Seas 5 to 8 ft. Wave Detail: NE 7 ft at 11 seconds and NE 6 ft at 8 seconds. .SAT...N winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt in the afternoon. Seas 5 to 8 ft. Wave Detail: E 7 ft at 10 seconds and NE 1 foot at 5 seconds. .SAT NIGHT...SW winds 5 to 10 kt. Seas 4 to 6 ft. Wave Detail: E 5 ft at 11 seconds. .SUN...S winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 5 ft. .SUN NIGHT AND MON...S winds 15 to 20 kt, becoming SW. Gusts up to 25 kt. Seas around 4 ft. Showers likely. Vsby 1 to 3 NM. .MON NIGHT...W winds around 15 kt with gusts up to 20 kt. Seas around 4 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-170000- Massachusetts Bay and Ipswich Bay- 703 AM EDT Thu Oct 16 2025 ...GALE WARNING IN EFFECT THROUGH LATE TONIGHT... .TODAY...N winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: N 5 ft at 6 seconds and E 3 ft at 10 seconds. .TONIGHT...N winds 20 to 25 kt with gusts up to 35 kt. Seas 5 to 7 ft. Wave Detail: NE 7 ft at 7 seconds and NW 2 ft at 4 seconds. .FRI...N winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Gusts up to 30 kt. Seas 5 to 7 ft. Wave Detail: N 7 ft at 7 seconds and E 1 foot at 9 seconds. .FRI NIGHT...N winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 6 ft. Wave Detail: NE 6 ft at 8 seconds and E 6 ft at 11 seconds. .SAT...N winds 10 to 15 kt, becoming NE 5 to 10 kt in the afternoon. Seas 4 to 6 ft. Wave Detail: E 6 ft at 11 seconds and N 1 foot at 4 seconds. .SAT NIGHT...S winds 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: E 5 ft at 10 seconds. .SUN...S winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. .SUN NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. A chance of showers. Vsby 1 to 3 NM. .MON...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Showers likely. Vsby 1 to 3 NM. .MON NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. A chance of showers. 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. $$ ANZ231-170000- Cape Cod Bay- 703 AM EDT Thu Oct 16 2025 ...GALE WARNING IN EFFECT THROUGH LATE TONIGHT... .TODAY...N winds 20 to 25 kt. Gusts up to 35 kt this afternoon. Seas 3 to 5 ft. Wave Detail: N 5 ft at 6 seconds and SE 3 ft at 10 seconds. .TONIGHT...N winds 25 to 30 kt with gusts up to 40 kt. Seas 5 to 7 ft. Wave Detail: N 7 ft at 6 seconds and SE 2 ft at 9 seconds. .FRI...N winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Gusts up to 30 kt. Seas 5 to 7 ft. Wave Detail: N 7 ft at 7 seconds and E 2 ft at 9 seconds. .FRI NIGHT...N winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: N 5 ft at 6 seconds and NE 5 ft at 11 seconds. .SAT...N winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt in the afternoon. Seas 3 to 5 ft. Wave Detail: NE 5 ft at 11 seconds and N 3 ft at 5 seconds. .SAT NIGHT...SW winds around 5 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 11 seconds and N 2 ft at 5 seconds. .SUN...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. .SUN NIGHT AND MON...S winds 15 to 20 kt, becoming SW. Gusts up to 25 kt. Seas 3 to 4 ft. Showers likely. .MON NIGHT...W winds around 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-170000- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 703 AM EDT Thu Oct 16 2025 ...GALE WARNING IN EFFECT THROUGH FRIDAY MORNING... .TODAY...N winds 20 to 25 kt. Gusts up to 35 kt this afternoon. Seas 5 to 7 ft. Wave Detail: N 7 ft at 7 seconds and SE 4 ft at 10 seconds. A slight chance of showers this afternoon. .TONIGHT...N winds 25 to 30 kt with gusts up to 35 kt. Seas 7 to 10 ft. Wave Detail: N 10 ft at 7 seconds and SE 3 ft at 9 seconds. A chance of showers. .FRI...N winds 20 to 25 kt with gusts up to 30 kt. Seas 7 to 10 ft. Wave Detail: N 10 ft at 7 seconds and E 9 ft at 9 seconds. .FRI NIGHT...N winds 20 to 25 kt with gusts up to 30 kt, diminishing to 15 to 20 kt after midnight. Seas 7 to 10 ft. Wave Detail: NE 8 ft at 9 seconds and NW 1 foot at 4 seconds. .SAT...N winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Seas 6 to 9 ft. Wave Detail: NE 8 ft at 11 seconds and N 1 foot at 4 seconds. .SAT NIGHT...NW winds 5 to 10 kt, becoming SW after midnight. Seas 5 to 7 ft. Wave Detail: E 6 ft at 11 seconds. .SUN...S winds 10 to 15 kt with gusts up to 20 kt. Seas 5 to 7 ft. .SUN NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 5 ft. A chance of showers. .MON AND MON NIGHT...SW winds 15 to 20 kt, becoming W. Gusts up to 25 kt. Seas 4 to 6 ft. Showers likely. Vsby 1 to 3 NM. 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. $$ ANZ255-170000- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 703 AM EDT Thu Oct 16 2025 ...GALE WARNING IN EFFECT THROUGH FRIDAY MORNING... .TODAY...N winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 7 ft. Wave Detail: N 4 ft at 6 seconds and SE 4 ft at 10 seconds. .TONIGHT...N winds 25 to 30 kt with gusts up to 35 kt. Seas 6 to 9 ft. Wave Detail: N 6 ft at 6 seconds and SE 2 ft at 9 seconds. .FRI...N winds 25 to 30 kt, diminishing to 20 to 25 kt in the afternoon. Seas 6 to 9 ft. Wave Detail: N 6 ft at 6 seconds and E 5 ft at 9 seconds. .FRI NIGHT...N winds 15 to 20 kt. Gusts up to 30 kt in the evening. Seas 5 to 7 ft, except 8 to 11 ft S and E of Nantucket. Wave Detail: E 6 ft at 11 seconds and N 3 ft at 5 seconds. .SAT...N winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Seas 5 to 7 ft. Wave Detail: E 6 ft at 11 seconds and N 3 ft at 4 seconds. .SAT NIGHT...NW winds 5 to 10 kt, becoming SW after midnight. Seas 4 to 6 ft. Wave Detail: E 5 ft at 11 seconds and NW 1 foot at 3 seconds. .SUN...S winds 15 to 20 kt. Seas 4 to 6 ft. .SUN NIGHT...S winds 20 to 25 kt. Seas 3 to 5 ft. A chance of showers. .MON...SW winds 20 to 25 kt. Seas 4 to 6 ft. Showers likely. .MON NIGHT...W winds 20 to 25 kt. Seas 5 to 6 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-170000- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 703 AM EDT Thu Oct 16 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY EVENING... .TODAY...N winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 7 ft. Wave Detail: N 5 ft at 5 seconds and SE 4 ft at 10 seconds. .TONIGHT...N winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 7 ft. Wave Detail: N 6 ft at 5 seconds and SE 3 ft at 9 seconds. .FRI...N winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Gusts up to 30 kt. Seas 5 to 7 ft. Wave Detail: N 5 ft at 5 seconds and E 2 ft at 9 seconds. .FRI NIGHT...N winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Seas 3 to 5 ft. Wave Detail: N 3 ft at 5 seconds and E 3 ft at 12 seconds. .SAT...N winds 10 to 15 kt, becoming NW 5 to 10 kt in the afternoon. Seas 3 to 5 ft. Wave Detail: E 4 ft at 12 seconds and N 2 ft at 4 seconds. .SAT NIGHT...SW winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at 11 seconds. .SUN...S winds 15 to 20 kt. Seas 3 to 4 ft. .SUN NIGHT...S winds 20 to 25 kt. Seas 4 to 5 ft. Showers likely. .MON...W winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 7 ft. Showers likely. .MON NIGHT...W winds 20 to 25 kt. Seas 5 to 7 ft. A chance of showers. 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. $$ ANZ232-170000- Nantucket Sound- 703 AM EDT Thu Oct 16 2025 ...GALE WARNING IN EFFECT THROUGH FRIDAY MORNING... .TODAY...N winds 15 to 20 kt, increasing to 20 to 25 kt this afternoon. Gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: N 3 ft at 5 seconds and E 2 ft at 10 seconds. .TONIGHT...N winds 25 to 30 kt with gusts up to 35 kt. Seas 4 to 6 ft. Wave Detail: N 4 ft at 5 seconds and E 1 foot at 9 seconds. .FRI...N winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: N 4 ft at 4 seconds and E 2 ft at 9 seconds. .FRI NIGHT...N winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: N 3 ft at 4 seconds and E 3 ft at 11 seconds. .SAT...N winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Seas 3 to 5 ft. Wave Detail: E 4 ft at 12 seconds and N 2 ft at 4 seconds. .SAT NIGHT...NW winds 5 to 10 kt, becoming SW after midnight. Seas 2 to 4 ft. Wave Detail: E 3 ft at 11 seconds and N 1 foot at 4 seconds. .SUN...S winds 15 to 20 kt. Seas 2 to 4 ft. .SUN NIGHT...S winds 20 to 25 kt. Seas 3 to 4 ft. A chance of showers. .MON...SW winds 20 to 25 kt. Seas 3 to 4 ft. Showers likely. .MON NIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-170000- Vineyard Sound- 703 AM EDT Thu Oct 16 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY AFTERNOON... .TODAY...N winds 15 to 20 kt with gusts up to 30 kt. Seas around 3 ft. Wave Detail: N 2 ft at 4 seconds and SE 2 ft at 10 seconds. .TONIGHT...N winds 20 to 25 kt with gusts up to 30 kt. Seas around 3 ft. Wave Detail: N 2 ft at 4 seconds and SE 1 foot at 9 seconds. .FRI...N winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: N 2 ft at 4 seconds and SE 1 foot at 9 seconds. .FRI NIGHT...N winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and E 2 ft at 12 seconds. .SAT...N winds 10 to 15 kt, becoming NW 5 to 10 kt in the afternoon. Seas around 2 ft. Wave Detail: E 2 ft at 12 seconds and N 1 foot at 3 seconds. .SAT NIGHT...SW winds around 5 kt. Seas around 2 ft. Wave Detail: E 2 ft at 12 seconds and W 1 foot at 3 seconds. .SUN...S winds 15 to 20 kt. Seas 2 to 3 ft. .SUN NIGHT...S winds 20 to 25 kt. Seas 3 to 4 ft. Showers likely. .MON...SW winds 20 to 25 kt. Seas 3 to 4 ft. Showers likely. .MON NIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. A chance of showers. 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. $$ ANZ234-170000- Buzzards Bay- 703 AM EDT Thu Oct 16 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY AFTERNOON... .TODAY...N winds 15 to 20 kt with gusts up to 30 kt. Seas around 3 ft. Wave Detail: N 2 ft at 4 seconds and SE 2 ft at 10 seconds. .TONIGHT...N winds 15 to 20 kt with gusts up to 30 kt. Seas around 3 ft. Wave Detail: N 2 ft at 4 seconds and SE 1 foot at 9 seconds. .FRI...N winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 9 seconds. .FRI NIGHT...N winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and E 2 ft at 12 seconds. .SAT...N winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: N 1 foot at 3 seconds and E 1 foot at 12 seconds. .SAT NIGHT...SW winds around 5 kt. Seas 1 foot or less. Wave Detail: N 1 foot at 2 seconds and W 1 foot at 2 seconds. .SUN...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. .SUN NIGHT AND MON...S winds 20 to 25 kt, becoming SW. Seas 3 to 4 ft. Showers likely. .MON NIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-170000- Rhode Island Sound- 703 AM EDT Thu Oct 16 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY AFTERNOON... .TODAY...N winds around 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: N 4 ft at 4 seconds and SE 3 ft at 10 seconds. .TONIGHT...N winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: N 4 ft at 5 seconds and SE 2 ft at 9 seconds. .FRI...N winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: N 3 ft at 4 seconds and SE 2 ft at 9 seconds. .FRI NIGHT...N winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 2 to 3 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 9 seconds. .SAT...N winds 5 to 10 kt, becoming NW in the afternoon. Seas 2 to 3 ft. Wave Detail: E 2 ft at 13 seconds and N 1 foot at 3 seconds. .SAT NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 12 seconds and W 1 foot at 2 seconds. .SUN...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. .SUN NIGHT...S winds 20 to 25 kt. Seas 3 to 4 ft. Showers likely. .MON...W winds 20 to 25 kt. Seas 3 to 5 ft. Showers likely. .MON NIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. A chance of showers. 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. $$ ANZ237-170000- Block Island Sound- 703 AM EDT Thu Oct 16 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY AFTERNOON... .TODAY...N winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: SE 4 ft at 10 seconds and N 3 ft at 4 seconds. .TONIGHT...N winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: N 3 ft at 4 seconds and SE 3 ft at 10 seconds. .FRI...N winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: N 2 ft at 4 seconds and SE 2 ft at 9 seconds. .FRI NIGHT...N winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: N 2 ft at 4 seconds and E 1 foot at 9 seconds. .SAT...N winds 5 to 10 kt, becoming W in the afternoon. Seas 2 to 3 ft. Wave Detail: E 2 ft at 13 seconds and N 1 foot at 3 seconds. .SAT NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft at 12 seconds. .SUN...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. .SUN NIGHT AND MON...S winds 20 to 25 kt, becoming W 15 to 20 kt. Seas 3 to 5 ft. Showers likely. .MON NIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-170000- Boston Harbor- 703 AM EDT Thu Oct 16 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY AFTERNOON... .TODAY...NW winds 15 to 20 kt with gusts up to 30 kt. Waves around 2 ft. .TONIGHT...N winds 15 to 20 kt with gusts up to 30 kt. Waves around 2 ft, except 3 to 5 ft at the outer harbor entrance. .FRI...N winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Gusts up to 25 kt. Waves around 2 ft, except 3 to 5 ft at the outer harbor entrance. .FRI NIGHT...N winds 5 to 10 kt. Waves 1 foot or less, except 2 to 4 ft at the outer harbor entrance. .SAT...N winds 5 to 10 kt, becoming NE in the afternoon. Waves 1 foot or less, except 2 to 4 ft at the outer harbor entrance. .SAT NIGHT...S winds around 5 kt. Waves 1 foot or less, except 2 to 4 ft at the outer harbor entrance. .SUN...S winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. .SUN NIGHT AND MON...S winds 15 to 20 kt, becoming SW. Gusts up to 25 kt. Waves around 2 ft. Showers likely. Vsby 1 to 3 NM. .MON NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. A chance of showers. 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. $$ ANZ236-170000- Narragansett Bay- 703 AM EDT Thu Oct 16 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY AFTERNOON... .TODAY...N winds 15 to 20 kt with gusts up to 25 kt. Waves 2 to 3 ft. .TONIGHT...N winds 15 to 20 kt with gusts up to 30 kt. Waves 2 to 3 ft. .FRI...N winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 3 ft. .FRI NIGHT...N winds 5 to 10 kt. Waves around 2 ft in the evening, then 1 foot or less. .SAT...N winds 5 to 10 kt, becoming NW in the afternoon. Waves around 2 ft. .SAT NIGHT...SW winds around 5 kt. Waves 1 foot or less. .SUN...S winds 15 to 20 kt with gusts up to 25 kt. Waves 2 to 3 ft. .SUN NIGHT AND MON...S winds 15 to 20 kt, becoming SW. Gusts up to 25 kt. Waves 2 to 4 ft. Showers likely. .MON NIGHT...W winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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