


Coastal Waters Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
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591 FZUS51 KBOX 260203 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 1003 PM EDT Fri Jul 25 2025 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-261500- 1003 PM EDT Fri Jul 25 2025 .Synopsis for Massachusetts and Rhode Island coastal waters... High pressure moves offshore Friday morning, a cold front will move into New England during the afternoon, crossing the waters overnight into Saturday morning. Low pressure system crosses the waters Monday. $$ ANZ250-261500- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 1003 PM EDT Fri Jul 25 2025 .OVERNIGHT...N winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: NW 2 ft at 4 seconds and SE 1 foot at 9 seconds. Patchy fog. A slight chance of tstms. Some tstms may be severe with gusty winds, small hail, frequent lightning, and heavy rainfall. Vsby 1 to 3 NM. .SAT...N winds 10 to 15 kt with gusts up to 20 kt, becoming E 5 to 10 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: N 3 ft at 9 seconds and NW 2 ft at 3 seconds. .SAT NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE 2 ft at 6 seconds and S 1 foot at 2 seconds. .SUN...S winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: S 2 ft at 3 seconds and E 1 foot at 7 seconds. .SUN NIGHT THROUGH MON NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft at 3 seconds and SE 1 foot at 8 seconds. .TUE THROUGH WED...N winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and E 1 foot at 8 seconds. .WED NIGHT...W winds around 10 kt. Seas around 2 ft. A chance of showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-261500- Massachusetts Bay and Ipswich Bay- 1003 PM EDT Fri Jul 25 2025 .OVERNIGHT...N winds 10 to 15 kt. Gusts up to 20 kt. Seas around 2 ft. Wave Detail: NW 1 foot at 3 seconds and SE 1 foot at 9 seconds. .SAT...N winds 5 to 10 kt, becoming E in the afternoon. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds. .SAT NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: S 1 foot at 2 seconds and NE 1 foot at 5 seconds. .SUN...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 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 E 1 foot at 6 seconds, becoming S 2 ft at 3 seconds and E 1 foot at 8 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: S 2 ft at 3 seconds and E 1 foot at 8 seconds. .MON AND MON NIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 3 seconds and E 1 foot at 8 seconds. .TUE THROUGH WED...NE winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. .WED NIGHT...W winds around 10 kt. Seas 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. $$ ANZ231-261500- Cape Cod Bay- 1003 PM EDT Fri Jul 25 2025 .OVERNIGHT...NW winds 5 to 10 kt, becoming N 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: W 1 foot at 2 seconds and SE 1 foot at 9 seconds. Patchy fog. A slight chance of showers and tstms. Some tstms may be severe with gusty winds, small hail, frequent lightning, and heavy rainfall. Vsby 1 to 3 NM. .SAT...NE winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt in the afternoon. Seas around 2 ft. Wave Detail: N 1 foot at 4 seconds. .SAT NIGHT...S winds around 5 kt. Seas 1 foot or less. Wave Detail: E 1 foot at 4 seconds. .SUN...S winds 5 to 10 kt. Seas 1 foot or less, then around 2 ft in the afternoon. Wave Detail: S 1 foot at 2 seconds and NE 1 foot at 5 seconds. .SUN NIGHT AND MON...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 1 foot at 2 seconds and E 1 foot at 6 seconds. .MON NIGHT...SW winds around 10 kt. Seas around 2 ft. Wave Detail: S 1 foot at 2 seconds and E 1 foot at 8 seconds. .TUE THROUGH WED NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-261500- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 1003 PM EDT Fri Jul 25 2025 .OVERNIGHT...NW winds around 10 kt, becoming N with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: NW 3 ft at 4 seconds and SE 1 foot at 9 seconds. Patchy fog. A chance of showers and tstms. Some tstms may be severe with gusty winds, small hail, frequent lightning, and heavy rainfall. Vsby 1 NM or less, increasing to 1 to 3 NM. .SAT...NE winds 10 to 15 kt. Gusts up to 20 kt in the morning. Seas 2 to 3 ft. Wave Detail: N 3 ft at 5 seconds and S 3 ft at 6 seconds. .SAT NIGHT...SE winds 5 to 10 kt, becoming S after midnight. Seas 2 to 3 ft. Wave Detail: NW 2 ft at 5 seconds and NE 2 ft at 6 seconds. .SUN...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE 2 ft at 6 seconds and SW 1 foot at 5 seconds. .SUN NIGHT THROUGH MON NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and SE 1 foot at 7 seconds. .TUE THROUGH WED NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft at 3 seconds and SE 1 foot at 8 seconds. 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. $$ ANZ255-261500- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 1003 PM EDT Fri Jul 25 2025 .OVERNIGHT...W winds around 10 kt, becoming N with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 6 seconds and SE 2 ft at 9 seconds. Patchy fog. A slight chance of showers and tstms. Some tstms may be severe with gusty winds, small hail, frequent lightning, and heavy rainfall. Vsby 1 to 3 NM. .SAT...NE winds 10 to 15 kt. Gusts up to 20 kt in the morning. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 4 seconds and SW 3 ft at 5 seconds. .SAT NIGHT...E winds 5 to 10 kt, becoming S after midnight. Seas 2 to 3 ft. Wave Detail: E 2 ft at 6 seconds and S 1 foot at 5 seconds. .SUN...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 6 seconds. .SUN NIGHT AND MON...S winds around 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 3 seconds and SE 2 ft at 7 seconds. .MON NIGHT...S winds around 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds and SE 1 foot at 8 seconds. .TUE THROUGH WED NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-261500- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 1003 PM EDT Fri Jul 25 2025 .OVERNIGHT...W winds around 10 kt, becoming N with gusts up to 20 kt. Seas around 3 ft. Wave Detail: SW 3 ft at 5 seconds and SE 2 ft at 9 seconds. .SAT...NE winds 10 to 15 kt. Gusts up to 20 kt in the morning. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 5 seconds and SW 2 ft at 5 seconds. .SAT NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 5 seconds. .SUN...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 3 seconds and SE 2 ft at 8 seconds. A chance of showers in the afternoon. .SUN NIGHT...S winds around 10 kt, becoming SW after midnight. Seas around 2 ft. Wave Detail: S 2 ft at 3 seconds and SE 2 ft at 8 seconds. A chance of showers in the evening. .MON AND MON NIGHT...SW winds around 10 kt. Seas around 2 ft. Wave Detail: W 2 ft at 4 seconds and E 2 ft at 8 seconds. .TUE THROUGH WED NIGHT...W 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. $$ ANZ232-261500- Nantucket Sound- 1003 PM EDT Fri Jul 25 2025 .OVERNIGHT...NW winds around 10 kt, becoming N with gusts up to 20 kt. Seas around 2 ft. Wave Detail: NW 2 ft at 4 seconds and SE 1 foot at 9 seconds. Patchy fog. A slight chance of tstms. Some tstms may be severe with gusty winds, small hail, frequent lightning, and heavy rainfall. .SAT...NE winds 10 to 15 kt. Gusts up to 20 kt in the morning. Seas around 2 ft. Wave Detail: NE 2 ft at 3 seconds and SW 1 foot at 5 seconds. .SAT NIGHT...SE winds 5 to 10 kt, becoming S after midnight. Seas around 2 ft in the evening, then 1 foot or less. Wave Detail: E 1 foot at 6 seconds, becoming S 1 foot at 4 seconds and E 1 foot at 6 seconds. .SUN...S winds 5 to 10 kt. Seas 1 foot or less, then around 2 ft in the afternoon. Wave Detail: S 1 foot at 3 seconds and E 1 foot at 6 seconds. .SUN NIGHT THROUGH MON NIGHT...SW winds around 10 kt. Seas around 2 ft. Wave Detail: S 1 foot at 3 seconds and E 1 foot at 7 seconds. .TUE THROUGH WED NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and E 1 foot at 8 seconds. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-261500- Vineyard Sound- 1003 PM EDT Fri Jul 25 2025 .OVERNIGHT...NW winds 5 to 10 kt, becoming N 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at 9 seconds. .SAT...NE winds 10 to 15 kt. Gusts up to 20 kt in the morning. Seas around 2 ft. Wave Detail: NE 1 foot at 3 seconds and SW 1 foot at 5 seconds. .SAT NIGHT...S winds 5 to 10 kt. Seas around 2 ft in the evening, then 1 foot or less. Wave Detail: SE 1 foot at 6 seconds, becoming S 1 foot at 4 seconds and SE 1 foot at 7 seconds. .SUN...S winds 5 to 10 kt. Seas 1 foot or less, then around 2 ft in the afternoon. Wave Detail: S 1 foot at 3 seconds and SE 1 foot at 7 seconds. .SUN NIGHT THROUGH MON NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 1 foot at 3 seconds and SE 1 foot at 8 seconds. .TUE THROUGH WED NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 9 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. $$ ANZ234-261500- Buzzards Bay- 1003 PM EDT Fri Jul 25 2025 .OVERNIGHT...NW winds 5 to 10 kt, becoming N 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at 9 seconds. .SAT...NE winds 10 to 15 kt with gusts up to 20 kt, becoming E in the afternoon. Seas around 2 ft. Wave Detail: NE 1 foot at 3 seconds and SW 1 foot at 5 seconds. .SAT NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: E 1 foot at 5 seconds. .SUN...S winds 5 to 10 kt. Seas 1 foot or less, then around 2 ft in the afternoon. Wave Detail: S 1 foot at 3 seconds and SE 1 foot at 7 seconds. .SUN NIGHT THROUGH MON NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 1 foot at 3 seconds and SE 1 foot at 8 seconds. .TUE THROUGH WED NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and SE 1 foot at 8 seconds. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-261500- Rhode Island Sound- 1003 PM EDT Fri Jul 25 2025 .OVERNIGHT...NW winds around 10 kt, becoming N with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 5 seconds and SE 1 foot at 9 seconds. .SAT...NE winds 10 to 15 kt with gusts up to 20 kt, becoming E in the afternoon. Seas 2 to 3 ft. Wave Detail: NE 2 ft at 4 seconds and S 2 ft at 6 seconds. .SAT NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 6 seconds. .SUN...S winds 5 to 10 kt. Seas 1 foot or less, then around 2 ft in the afternoon. Wave Detail: SE 1 foot at 4 seconds and SE 1 foot at 8 seconds, becoming S 2 ft at 3 seconds and SE 1 foot at 8 seconds. A chance of showers in the afternoon. .SUN NIGHT...S winds around 10 kt, becoming SW after midnight. Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds and SE 1 foot at 8 seconds. A chance of showers in the evening. .MON AND MON NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds and SE 1 foot at 8 seconds. .TUE THROUGH WED NIGHT...W 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. $$ ANZ237-261500- Block Island Sound- 1003 PM EDT Fri Jul 25 2025 .OVERNIGHT...NW winds 5 to 10 kt, becoming N 10 to 15 kt. Seas around 2 ft. Wave Detail: W 2 ft at 5 seconds and SE 1 foot at 9 seconds. .SAT...NE winds 10 to 15 kt with gusts up to 20 kt, becoming E in the afternoon. Seas 2 to 3 ft. Wave Detail: NE 2 ft at 5 seconds and S 2 ft at 6 seconds. .SAT NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 6 seconds. .SUN...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 1 foot at 4 seconds and SE 1 foot at 7 seconds. A chance of showers in the afternoon. .SUN NIGHT...S winds 5 to 10 kt, becoming W after midnight. Seas around 2 ft. Wave Detail: S 2 ft at 3 seconds and SE 1 foot at 8 seconds. A chance of showers in the evening. .MON AND MON NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: W 1 foot at 4 seconds and SE 1 foot at 8 seconds. .TUE THROUGH WED...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. .WED NIGHT...W winds around 10 kt. Seas around 2 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-261500- Boston Harbor- 1003 PM EDT Fri Jul 25 2025 .OVERNIGHT...N winds around 10 kt. Waves around 2 ft, then 1 foot or less. .SAT...NE 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 5 to 10 kt, becoming S 10 to 15 kt in the afternoon. Waves 1 foot or less, then around 2 ft in the afternoon. A chance of showers 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. A chance of showers in the evening. .MON AND MON NIGHT...SW winds 5 to 10 kt. Waves around 2 ft. .TUE THROUGH WED...E winds 5 to 10 kt. Waves around 2 ft. .WED NIGHT...W winds 5 to 10 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. $$ ANZ236-261500- Narragansett Bay- 1003 PM EDT Fri Jul 25 2025 .OVERNIGHT...N winds 5 to 10 kt. Waves around 2 ft. .SAT...NE winds 10 to 15 kt, becoming E 5 to 10 kt in the afternoon. Waves around 2 ft. .SAT NIGHT...S winds 5 to 10 kt. Waves around 2 ft in the evening, then 1 foot or less. .SUN...S winds 5 to 10 kt. Waves 1 foot or less, then around 2 ft in the afternoon. A chance of showers in the afternoon. .SUN NIGHT...S winds 5 to 10 kt, becoming SW after midnight. Waves around 2 ft in the evening, then 1 foot or less. A chance of showers in the evening. .MON AND MON NIGHT...SW winds 5 to 10 kt. Waves around 2 ft. .TUE THROUGH WED...W winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. .WED NIGHT...W winds 5 to 10 kt. Waves around 2 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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