FZUS51 KBOX 151402 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 1002 AM EDT Wed Apr 15 2026 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-160300- 1002 AM EDT Wed Apr 15 2026 .Synopsis for Massachusetts and Rhode Island coastal waters... A backdoor cold front remains over northern New England today, which may flirt with MA waters north of Cape Cod today and/or Thu. A cold front likely crosses waters sometime Fri/Fri night followed by a stronger cold front sometime Sun/Sun night. Early next week, high pres builds from the Great Lakes to the Mid Atlantic. $$ ANZ250-160300- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 1002 AM EDT Wed Apr 15 2026 .THIS AFTERNOON...N winds 5 to 10 kt, becoming E. Seas around 2 ft. Patchy fog. A slight chance of showers. Vsby 1 NM or less. .TONIGHT...SE winds around 10 kt, becoming NE after midnight. Seas around 2 ft. Patchy fog. A chance of showers. Vsby 1 NM or less. .THU...E winds 5 to 10 kt. Seas around 2 ft. A chance of showers. Patchy fog in the morning with vsby 1 to 3 NM. .THU NIGHT...SE winds around 10 kt, becoming SW after midnight. Seas around 2 ft. A chance of showers. Patchy fog in the evening. .FRI AND FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. A chance of showers. .SAT AND SAT NIGHT...NE winds 5 to 10 kt, becoming SE. Seas 2 to 3 ft. .SUN...S winds 15 to 20 kt. Seas 2 to 3 ft. A chance of showers. .SUN NIGHT...W winds 20 to 25 kt. Seas 3 to 5 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-160300- Massachusetts Bay and Ipswich Bay- 1002 AM EDT Wed Apr 15 2026 .THIS AFTERNOON...N winds 5 to 10 kt, becoming E. Seas around 2 ft. Patchy fog. A slight chance of showers. Vsby 1 NM or less. .TONIGHT...E winds 5 to 10 kt, becoming NE after midnight. Seas around 2 ft in the evening, then 1 foot or less. Patchy fog. A chance of showers. Vsby 1 NM or less. .THU...NE winds 5 to 10 kt. Seas 1 foot or less, then around 2 ft in the afternoon. A chance of showers. Patchy fog in the morning with vsby 1 to 3 NM. .THU NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas around 2 ft. A chance of showers. Patchy fog in the evening. .FRI...W winds 5 to 10 kt, becoming N in the afternoon. Seas around 2 ft. A chance of showers in the morning, then showers likely in the afternoon. .FRI NIGHT...NE winds around 10 kt. Seas around 2 ft. A chance of showers in the evening. .SAT AND SAT NIGHT...NE winds 5 to 10 kt, becoming SE. Seas around 2 ft. .SUN AND SUN NIGHT...S winds 10 to 15 kt, becoming W 15 to 20 kt. 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. $$ ANZ231-160300- Cape Cod Bay- 1002 AM EDT Wed Apr 15 2026 .THIS AFTERNOON...N winds around 5 kt, becoming E. Seas 1 foot or less. Patchy fog. Vsby 1 NM or less. .TONIGHT...S winds 5 to 10 kt, becoming W after midnight. Seas 1 foot or less. Patchy fog. A chance of showers and tstms. Vsby 1 NM or less. .THU...W winds 5 to 10 kt, becoming SW in the afternoon. Seas 1 foot or less. Patchy fog in the morning. A chance of showers in the morning with vsby 1 to 3 NM. .THU NIGHT...SW winds 5 to 10 kt. Seas 1 foot or less. A chance of showers. .FRI...SW winds around 5 kt, becoming NW in the afternoon. Seas 1 foot or less. A chance of showers. .FRI NIGHT...NE winds 5 to 10 kt. Seas 1 foot or less. A chance of showers in the evening. .SAT AND SAT NIGHT...NE winds 5 to 10 kt, becoming SE. Seas 1 foot or less. .SUN AND SUN NIGHT...S winds 10 to 15 kt, becoming W 15 to 20 kt. Gusts up to 25 kt. Seas 2 to 3 ft. A chance of showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-160300- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 1002 AM EDT Wed Apr 15 2026 .THIS AFTERNOON...NW winds 5 to 10 kt, becoming SE. Seas 2 to 3 ft. Patchy fog. Vsby 1 NM or less. .TONIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas 2 to 3 ft. Patchy fog. A chance of showers. A chance of tstms in the evening. Vsby 1 NM or less. .THU...SW winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 2 to 3 ft. Patchy fog in the morning with vsby 1 to 3 NM. .THU NIGHT...SW winds 10 to 15 kt. Seas 2 to 4 ft. .FRI...W winds 5 to 10 kt. Seas 2 to 4 ft. A chance of showers in the afternoon. .FRI NIGHT...N winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers in the evening. .SAT AND SAT NIGHT...NE winds 5 to 10 kt, becoming SE. Seas 2 to 3 ft. .SUN...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. A chance of showers. .SUN NIGHT...W winds 20 to 25 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. $$ ANZ255-160300- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 1002 AM EDT Wed Apr 15 2026 .THIS AFTERNOON...SW winds 5 to 10 kt. Seas 3 to 4 ft. Patchy fog with vsby 1 NM or less. .TONIGHT...SW winds around 10 kt. Seas 3 to 4 ft. Patchy fog. A chance of showers. A chance of tstms in the evening. Vsby 1 NM or less. .THU...SW winds 10 to 15 kt. Seas 3 to 4 ft. Patchy fog in the morning with vsby 1 to 3 NM. .THU NIGHT...SW winds 10 to 15 kt. Seas 3 to 5 ft. .FRI...SW winds 10 to 15 kt. Seas 3 to 4 ft. .FRI NIGHT...NW winds around 10 kt, becoming NE after midnight. Seas 3 to 4 ft. .SAT AND SAT NIGHT...NE winds 5 to 10 kt, becoming SE 10 to 15 kt. Seas 2 to 3 ft. .SUN...S winds 15 to 20 kt. Seas 3 to 5 ft. A chance of showers. .SUN NIGHT...W winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 7 ft. A chance of showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-160300- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 1002 AM EDT Wed Apr 15 2026 .THIS AFTERNOON...SW winds 5 to 10 kt. Seas 3 to 4 ft. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or less. .TONIGHT...SW winds 10 to 15 kt. Seas 3 to 4 ft. Patchy fog. A chance of showers and tstms. Vsby 1 NM or less. .THU...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas 3 to 4 ft. Patchy fog in the morning with vsby 1 to 3 NM. .THU NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 4 to 5 ft. .FRI...SW winds around 10 kt. Seas 3 to 4 ft. A chance of showers in the afternoon. .FRI NIGHT...NE winds around 10 kt. Seas 3 to 4 ft. A chance of showers in the evening. .SAT AND SAT NIGHT...NE winds 5 to 10 kt, becoming SE 10 to 15 kt. Seas 2 to 3 ft. .SUN...S winds 15 to 20 kt. Seas 2 to 4 ft. A chance of showers. .SUN NIGHT...W winds 20 to 25 kt with gusts up to 30 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. $$ ANZ232-160300- Nantucket Sound- 1002 AM EDT Wed Apr 15 2026 .THIS AFTERNOON...W winds 5 to 10 kt, becoming S. Seas around 2 ft. Patchy fog with vsby 1 NM or less. .TONIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas around 2 ft. Patchy fog. A chance of showers. A chance of tstms in the evening. Vsby 1 NM or less. .THU...SW winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas around 2 ft. Patchy fog in the morning with vsby 1 to 3 NM. .THU NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. .FRI...SW winds 5 to 10 kt. Seas around 2 ft. A chance of showers in the afternoon. .FRI NIGHT...N winds 5 to 10 kt. Seas around 2 ft. A chance of showers in the evening. .SAT AND SAT NIGHT...NE winds 5 to 10 kt, becoming SE. Seas around 2 ft. .SUN AND SUN NIGHT...S winds 10 to 15 kt, becoming W 20 to 25 kt. Seas 2 to 4 ft. A chance of showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-160300- Vineyard Sound- 1002 AM EDT Wed Apr 15 2026 .THIS AFTERNOON...SW winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog with vsby 1 to 3 NM. .TONIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. A chance of showers and tstms. Vsby 1 NM or less. .THU...S winds 5 to 10 kt, becoming SW 10 to 15 kt in the afternoon. Seas 2 to 3 ft. Patchy fog in the morning with vsby 1 to 3 NM. .THU NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. .FRI...SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers in the afternoon. .FRI NIGHT...N winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers in the evening. .SAT AND SAT NIGHT...NE winds 5 to 10 kt, becoming SE. Seas around 2 ft. .SUN AND SUN NIGHT...S winds 10 to 15 kt, becoming W 20 to 25 kt. Seas 2 to 4 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. $$ ANZ234-160300- Buzzards Bay- 1002 AM EDT Wed Apr 15 2026 .THIS AFTERNOON...SW winds 5 to 10 kt. Seas around 2 ft. Patchy fog with vsby 1 to 3 NM. .TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Patchy fog. A chance of showers and tstms. Vsby 1 NM or less. .THU...S winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas around 2 ft. Patchy fog in the morning with vsby 1 to 3 NM. .THU NIGHT...SW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft. .FRI...SW winds 5 to 10 kt. Seas around 2 ft. A chance of showers. .FRI NIGHT...N winds 5 to 10 kt. Seas around 2 ft. A chance of showers in the evening. .SAT AND SAT NIGHT...NE winds 5 to 10 kt, becoming SE. Seas around 2 ft. .SUN AND SUN NIGHT...S winds 10 to 15 kt, becoming W 15 to 20 kt. Gusts up to 25 kt. Seas 2 to 3 ft. A chance of showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-160300- Rhode Island Sound- 1002 AM EDT Wed Apr 15 2026 .THIS AFTERNOON...SW winds 5 to 10 kt, becoming S. Seas 2 to 3 ft. Patchy fog with vsby 1 NM or less. .TONIGHT...SW winds around 10 kt. Seas 2 to 3 ft. Patchy fog. A chance of showers and tstms. Vsby 1 NM or less. .THU...SW winds 10 to 15 kt. Seas around 3 ft. Patchy fog in the morning with vsby 1 to 3 NM. .THU NIGHT...SW winds 10 to 15 kt. Seas 3 to 4 ft. .FRI...SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers in the afternoon. .FRI NIGHT...NE winds around 10 kt. Seas 2 to 3 ft. A chance of showers in the evening. .SAT AND SAT NIGHT...NE winds around 10 kt, becoming SE. Seas 2 to 3 ft. .SUN...S winds 15 to 20 kt. Seas 2 to 3 ft. A chance of showers. .SUN NIGHT...W winds 20 to 25 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. $$ ANZ237-160300- Block Island Sound- 1002 AM EDT Wed Apr 15 2026 .THIS AFTERNOON...SW winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. Vsby 1 NM or less. .TONIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. A chance of showers and tstms. Vsby 1 NM or less. .THU...SW winds 5 to 10 kt, becoming S 10 to 15 kt in the afternoon. Seas 2 to 3 ft. Patchy fog in the morning. .THU NIGHT...SW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. .FRI...SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers in the afternoon. .FRI NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers in the evening. .SAT AND SAT NIGHT...NE winds 5 to 10 kt, becoming SE. Seas 2 to 3 ft. .SUN AND SUN NIGHT...S winds 10 to 15 kt, becoming W 15 to 20 kt. Gusts up to 25 kt. Seas 2 to 4 ft. A chance of showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-160300- Boston Harbor- 1002 AM EDT Wed Apr 15 2026 .THIS AFTERNOON...NE winds 5 to 10 kt. Waves 1 foot or less. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .TONIGHT...E winds 5 to 10 kt. Waves 1 foot or less. Patchy fog. A chance of showers. Vsby 1 NM or less. .THU...E winds 5 to 10 kt. Waves 1 foot or less. A chance of showers. Patchy fog in the morning with vsby 1 to 3 NM. .THU NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Waves 1 foot or less. A chance of showers. .FRI...W winds 5 to 10 kt, becoming N in the afternoon. Waves 1 foot or less. A chance of showers in the morning, then showers likely with a chance of tstms in the afternoon. .FRI NIGHT...NE winds 5 to 10 kt. Waves 1 foot or less. A chance of showers in the evening. .SAT AND SAT NIGHT...NE winds 5 to 10 kt, becoming SE. Waves 1 foot or less. .SUN AND SUN NIGHT...S winds 10 to 15 kt, becoming W 15 to 20 kt. Waves around 2 ft. A chance of showers. 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. $$ ANZ236-160300- Narragansett Bay- 1002 AM EDT Wed Apr 15 2026 .THIS AFTERNOON...SW winds 5 to 10 kt. Waves around 2 ft. A slight chance of showers. .TONIGHT...S winds 5 to 10 kt. Waves around 2 ft. Patchy fog. A chance of showers and tstms. Vsby 1 NM or less. .THU...S winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Waves around 2 ft. Patchy fog in the morning with vsby 1 to 3 NM. .THU NIGHT...SW winds 5 to 10 kt. Waves around 2 ft. .FRI...SW winds 5 to 10 kt. Waves around 2 ft. A chance of showers in the afternoon. .FRI NIGHT...NE winds 5 to 10 kt. Waves around 2 ft. A chance of showers in the evening. .SAT AND SAT NIGHT...NE winds 5 to 10 kt, becoming SE. Waves around 2 ft. .SUN AND SUN NIGHT...S winds 10 to 15 kt, becoming W. Gusts up to 20 kt. Waves 2 to 3 ft. A chance of showers. Winds and waves higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ For the latest updates...please visit our webpage at www.weather.gov/boston You can follow us on Facebook at www.facebook.com/us.nationalweatherservice.boston.gov You can follow us on Twitter at @NWSBoston