


Coastal Waters Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
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106 FZUS51 KBOX 081703 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 103 PM EDT Wed Oct 8 2025 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-090600- 103 PM EDT Wed Oct 8 2025 .Synopsis for Massachusetts and Rhode Island coastal waters... Breezy NW winds behind a cold front this afternoon into this evening. Another high pres arrives from the NW tonight into Thursday, then moves over the N Atlc this weekend. $$ ANZ250-090600- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 103 PM EDT Wed Oct 8 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON... .THIS AFTERNOON...N winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 4 ft. Wave Detail: NW 3 ft at 5 seconds and SE 2 ft at 8 seconds. Patchy fog. Showers. Vsby 1 NM or less. .TONIGHT...N winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: N 6 ft at 5 seconds. .THU...N winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: N 6 ft at 6 seconds. .THU NIGHT...N winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: N 4 ft at 6 seconds. .FRI AND FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 6 seconds and SW 2 ft at 3 seconds. .SAT AND SAT NIGHT...SW winds 5 to 10 kt, becoming SE 10 to 15 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and SE 2 ft at 12 seconds. .SUN...NE winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. A chance of showers. .SUN NIGHT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 8 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-090600- Massachusetts Bay and Ipswich Bay- 103 PM EDT Wed Oct 8 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON... .THIS AFTERNOON...N winds 15 to 20 kt with gusts up to 25 kt. Seas around 3 ft. Wave Detail: NW 2 ft at 4 seconds and E 1 foot at 9 seconds. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .TONIGHT...N winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: N 4 ft at 5 seconds. .THU...N winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: N 4 ft at 5 seconds. .THU NIGHT...N winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 4 ft. Wave Detail: NE 4 ft at 7 seconds and NW 2 ft at 4 seconds. .FRI AND FRI NIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: NE 2 ft at 6 seconds and NW 1 foot at 3 seconds. .SAT AND SAT NIGHT...SW winds 5 to 10 kt, becoming SE. Seas around 2 ft. Wave Detail: E 2 ft at 12 seconds and SW 1 foot at 2 seconds. .SUN...NE winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 3 ft. A chance of showers. .SUN NIGHT...NE winds 20 to 25 kt with gusts up to 30 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. $$ ANZ231-090600- Cape Cod Bay- 103 PM EDT Wed Oct 8 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON... .THIS AFTERNOON...N winds 15 to 20 kt with gusts up to 30 kt. Seas around 3 ft. Wave Detail: NW 2 ft at 4 seconds and SE 1 foot at 9 seconds. Patchy fog. Showers with isolated tstms. Vsby 1 NM or less. .TONIGHT...N winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 4 ft. Wave Detail: N 4 ft at 6 seconds. .THU...N winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Gusts up to 30 kt. Seas 3 to 4 ft. Wave Detail: N 4 ft at 6 seconds. .THU NIGHT...N winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 4 ft. Wave Detail: N 4 ft at 6 seconds. .FRI AND FRI NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: N 2 ft at 5 seconds. .SAT AND SAT NIGHT...S winds around 5 kt, becoming E 10 to 15 kt. Seas 1 foot or less, then around 2 ft. Wave Detail: SW 1 foot at 3 seconds and NE 1 foot at 6 seconds, becoming S 1 foot at 2 seconds and SE 1 foot at 10 seconds. .SUN AND SUN NIGHT...NE winds 20 to 25 kt with gusts up to 35 kt. Seas 3 to 5 ft. A chance of showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-090600- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 103 PM EDT Wed Oct 8 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON... .THIS AFTERNOON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: W 5 ft at 5 seconds and SE 1 foot at 11 seconds. Patchy fog. Showers with isolated tstms. Vsby 1 NM or less. .TONIGHT...N winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: N 6 ft at 6 seconds. Patchy fog in the evening with vsby 1 to 3 NM. .THU...N winds 20 to 25 kt. Seas 5 to 7 ft. Wave Detail: N 6 ft at 7 seconds. .THU NIGHT...N winds 15 to 20 kt with gusts up to 25 kt, diminishing to 10 to 15 kt after midnight. Seas 4 to 6 ft. Wave Detail: N 5 ft at 7 seconds. .FRI AND FRI NIGHT...SW winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: N 3 ft at 6 seconds. .SAT AND SAT NIGHT...S winds 5 to 10 kt, becoming E 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 11 seconds and SW 1 foot at 3 seconds. .SUN...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft. A chance of showers. .SUN NIGHT...NE winds 25 to 30 kt with gusts up to 35 kt. Seas 7 to 10 ft. A chance of showers. Winds and seas 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. $$ ANZ255-090600- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 103 PM EDT Wed Oct 8 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON... .THIS AFTERNOON...W winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: SW 6 ft at 7 seconds and SE 1 foot at 10 seconds. Patchy fog. Showers with isolated tstms. Vsby 1 NM or less. .TONIGHT...N winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 7 ft. Wave Detail: NW 6 ft at 7 seconds and E 4 ft at 7 seconds. Patchy fog in the evening. A chance of showers in the evening with vsby 1 to 3 NM. .THU...N winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 7 ft. Wave Detail: NW 5 ft at 5 seconds and NE 4 ft at 6 seconds. .THU NIGHT...N winds 15 to 20 kt with gusts up to 25 kt, diminishing to 10 to 15 kt after midnight. Seas 3 to 5 ft. Wave Detail: N 4 ft at 6 seconds. .FRI...NE winds 5 to 10 kt, becoming S in the afternoon. Seas 2 to 3 ft. Wave Detail: NE 2 ft at 7 seconds and NW 1 foot at 4 seconds. .FRI NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and SW 1 foot at 3 seconds. .SAT...SE winds 5 to 10 kt. Seas around 2 ft. .SAT NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of showers. .SUN...NE winds 25 to 30 kt with gusts up to 35 kt. Seas 5 to 7 ft. A chance of showers. .SUN NIGHT...NE winds 30 to 40 kt. Seas 8 to 11 ft. A chance of showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-090600- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 103 PM EDT Wed Oct 8 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON... .THIS AFTERNOON...NW 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 SE 1 foot at 10 seconds. Patchy fog. Showers with isolated tstms. Vsby 1 NM or less. .TONIGHT...N winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 7 ft. Wave Detail: NW 6 ft at 6 seconds and E 5 ft at 8 seconds. .THU...N winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: NW 5 ft at 6 seconds and E 5 ft at 6 seconds. .THU NIGHT...N winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 2 to 4 ft. Wave Detail: NW 3 ft at 5 seconds and NE 3 ft at 6 seconds. .FRI AND FRI NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE 2 ft at 6 seconds and NW 1 foot at 4 seconds. .SAT...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 10 seconds and SW 1 foot at 4 seconds. .SAT NIGHT...E winds 20 to 25 kt. Seas 3 to 5 ft. A chance of showers. .SUN...NE winds 25 to 35 kt with gusts up to 40 kt. Seas 6 to 9 ft. A chance of showers. .SUN NIGHT...NE winds 30 to 40 kt with gusts up to 45 kt. Seas 10 to 14 ft. A chance of showers. Winds and seas 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. $$ ANZ232-090600- Nantucket Sound- 103 PM EDT Wed Oct 8 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON... .THIS AFTERNOON...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 4 ft. Wave Detail: W 4 ft at 5 seconds and SE 1 foot at 9 seconds. Patchy fog. Showers with isolated tstms. Vsby 1 NM or less. .TONIGHT...N winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 4 ft. Wave Detail: N 4 ft at 5 seconds. Patchy fog in the evening with vsby 1 to 3 NM. .THU...N winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: NW 4 ft at 4 seconds and NE 2 ft at 7 seconds. .THU NIGHT...N winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Seas 2 to 4 ft. Wave Detail: NW 3 ft at 4 seconds and NE 2 ft at 7 seconds. .FRI AND FRI NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: N 1 foot at 4 seconds. .SAT...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: SW 1 foot at 2 seconds and E 1 foot at 6 seconds. .SAT NIGHT...E winds 15 to 20 kt. Seas 2 to 3 ft. A chance of showers. .SUN...NE winds 25 to 30 kt with gusts up to 35 kt. Seas 3 to 5 ft. A chance of showers. .SUN NIGHT...NE winds 30 to 35 kt with gusts up to 40 kt. Seas 4 to 6 ft. A chance of showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-090600- Vineyard Sound- 103 PM EDT Wed Oct 8 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON... .THIS AFTERNOON...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 7 seconds and SE 1 foot at 10 seconds. Patchy fog. Showers with isolated tstms. Vsby 1 NM or less. .TONIGHT...N winds 15 to 20 kt with gusts up to 25 kt. Seas around 3 ft. Wave Detail: NW 3 ft at 6 seconds and NE 2 ft at 5 seconds. .THU...N winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: N 2 ft at 5 seconds. .THU NIGHT...N winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft. Wave Detail: N 1 foot at 5 seconds. .FRI AND FRI NIGHT...SW winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: NW 1 foot at 3 seconds and NE 1 foot at 4 seconds. .SAT...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: SW 1 foot at 3 seconds and SE 1 foot at 9 seconds. .SAT NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of showers. .SUN...NE winds 25 to 30 kt with gusts up to 35 kt. Seas 3 to 5 ft. A chance of showers. .SUN NIGHT...NE winds 25 to 30 kt with gusts up to 35 kt. Seas 5 to 7 ft. A chance of showers. Winds and seas 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. $$ ANZ234-090600- Buzzards Bay- 103 PM EDT Wed Oct 8 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON... .THIS AFTERNOON...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: W 4 ft at 6 seconds and SE 1 foot at 10 seconds. Patchy fog. Showers with isolated tstms. Vsby 1 NM or less. .TONIGHT...N winds 15 to 20 kt with gusts up to 25 kt. Seas around 3 ft. Wave Detail: NW 3 ft at 6 seconds and NE 2 ft at 9 seconds. .THU...N winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: N 2 ft at 4 seconds. .THU NIGHT...N winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft in the evening, then 1 foot or less. Wave Detail: N 2 ft at 5 seconds, becoming N 1 foot at 4 seconds. .FRI AND FRI NIGHT...SW winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: N 1 foot at 3 seconds. .SAT...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: SW 1 foot at 3 seconds and SE 1 foot at 8 seconds. .SAT NIGHT...E winds 10 to 15 kt. Seas around 2 ft. A chance of showers. .SUN...NE winds 25 to 30 kt with gusts up to 35 kt. Seas 3 to 5 ft. A chance of showers. .SUN NIGHT...NE winds 25 to 30 kt with gusts up to 35 kt. Seas 3 to 5 ft. A chance of showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-090600- Rhode Island Sound- 103 PM EDT Wed Oct 8 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON... .THIS AFTERNOON...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 7 seconds and SE 1 foot at 11 seconds. Patchy fog. Showers with isolated tstms. Vsby 1 NM or less. .TONIGHT...N winds 15 to 20 kt, increasing to 20 to 25 kt after midnight. Seas 3 to 4 ft. Wave Detail: NW 4 ft at 6 seconds and SE 2 ft at 9 seconds. .THU...N winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: NW 3 ft at 5 seconds and E 3 ft at 6 seconds. .THU NIGHT...N winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: NW 2 ft at 4 seconds and E 2 ft at 6 seconds. .FRI AND FRI NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE 2 ft at 6 seconds and NW 1 foot at 5 seconds. .SAT...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 1 foot at 3 seconds and SE 1 foot at 10 seconds. .SAT NIGHT...E winds 15 to 20 kt. Seas 2 to 3 ft. A chance of showers. .SUN...NE winds 25 to 30 kt with gusts up to 35 kt. Seas 5 to 7 ft. A chance of showers. .SUN NIGHT...NE winds 25 to 30 kt with gusts up to 35 kt. Seas 6 to 9 ft. A chance of showers. Winds and seas 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. $$ ANZ237-090600- Block Island Sound- 103 PM EDT Wed Oct 8 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON... .THIS AFTERNOON...N winds around 15 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: W 4 ft at 6 seconds and SE 2 ft at 10 seconds. Patchy fog. Showers with isolated tstms. Vsby 1 to 3 NM. .TONIGHT...N winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: N 4 ft at 6 seconds and SE 2 ft at 9 seconds. .THU...N winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: NW 3 ft at 4 seconds and E 3 ft at 6 seconds. .THU NIGHT...N winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: NE 2 ft at 5 seconds and W 1 foot at 5 seconds. .FRI AND FRI NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE 2 ft at 6 seconds and NW 1 foot at 4 seconds. .SAT...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 1 foot at 4 seconds and SE 1 foot at 8 seconds. .SAT NIGHT...E winds 15 to 20 kt. Seas 2 to 3 ft. A chance of showers. .SUN...NE winds 25 to 30 kt with gusts up to 35 kt. Seas 5 to 7 ft. A chance of showers. .SUN NIGHT...NE winds 25 to 30 kt with gusts up to 35 kt. Seas 7 to 10 ft. A chance of showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-090600- Boston Harbor- 103 PM EDT Wed Oct 8 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON... .THIS AFTERNOON...N winds around 15 kt with gusts up to 20 kt. Waves around 2 ft. Patchy fog. Showers. Vsby 1 to 3 NM. .TONIGHT...N winds 15 to 20 kt. Waves around 2 ft. .THU...NW winds 15 to 20 kt, becoming N 10 to 15 kt in the afternoon. Waves around 2 ft. .THU NIGHT...N winds 10 to 15 kt, becoming NW 5 to 10 kt after midnight. Waves around 2 ft in the evening, then 1 foot or less. .FRI AND FRI NIGHT...SW winds 5 to 10 kt. Waves 1 foot or less. .SAT AND SAT NIGHT...SW winds around 5 kt, becoming SE. Waves 1 foot or less. .SUN AND SUN NIGHT...NE winds 15 to 20 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. $$ ANZ236-090600- Narragansett Bay- 103 PM EDT Wed Oct 8 2025 .THIS AFTERNOON...N winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 3 ft. Patchy fog. Showers. Vsby 1 to 3 NM. .TONIGHT...N winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. .THU...N winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. .THU NIGHT...N winds 5 to 10 kt. Waves around 2 ft. .FRI AND FRI NIGHT...SW winds 5 to 10 kt. Waves 1 foot or less. .SAT AND SAT NIGHT...S winds 5 to 10 kt, becoming E 10 to 15 kt. Waves 1 foot or less, then around 2 ft. .SUN AND SUN NIGHT...NE winds 20 to 25 kt with gusts up to 30 kt. Waves 2 to 3 ft, except 4 to 6 ft at the bay entrance. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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