FZUS51 KBOX 152302 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 702 PM EDT Wed Apr 15 2026 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-161200- 702 PM 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 through 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. $$ ANZ250-161200- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 702 PM EDT Wed Apr 15 2026 .TONIGHT...SE winds 5 to 10 kt. Seas around 2 ft. Patchy fog. A slight chance of showers this evening. A chance of showers with a slight chance of tstms after midnight. Vsby 1 NM or less. .THU...SE winds 5 to 10 kt. Seas around 2 ft. Patchy fog. A chance of showers in the morning with vsby 1 NM or less. .THU NIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas around 2 ft. A chance of showers. .FRI...W winds 5 to 10 kt, becoming NE in the afternoon. Seas around 2 ft. A chance of showers. .FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. A chance of showers in the evening. .SAT AND SAT NIGHT...S winds 5 to 10 kt. Seas around 2 ft. .SUN AND SUN NIGHT...SW winds 10 to 15 kt, becoming W 15 to 20 kt. Gusts up to 25 kt. Seas 2 to 4 ft. Showers likely. .MON AND MON NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-161200- Massachusetts Bay and Ipswich Bay- 702 PM EDT Wed Apr 15 2026 .TONIGHT...E winds 5 to 10 kt. Seas around 2 ft this evening, then 1 foot or less. Patchy fog. A slight chance of tstms. A slight chance of showers this evening, then a chance of showers after midnight. Vsby 1 NM or less. .THU...E winds 5 to 10 kt. Seas 1 foot or less. Patchy fog in the morning with vsby 1 NM or less. .THU NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas around 2 ft. Patchy fog. A chance of showers. .FRI...NW winds 5 to 10 kt, becoming NE in the afternoon. Seas around 2 ft. A chance of showers. .FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. A chance of showers in the evening. .SAT...NE winds 5 to 10 kt. Seas around 2 ft. .SAT NIGHT...SE winds 5 to 10 kt. Seas around 2 ft. A chance of showers after midnight. .SUN AND SUN NIGHT...SW winds 10 to 15 kt, becoming W 15 to 20 kt. Seas 2 to 3 ft. Showers likely. .MON AND MON NIGHT...NW winds 15 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. $$ ANZ231-161200- Cape Cod Bay- 702 PM EDT Wed Apr 15 2026 .TONIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas 1 foot or less. Patchy fog. A slight chance of tstms. A slight chance of showers this evening, then a chance of showers after midnight. Vsby 1 NM or less. .THU...SW winds 5 to 10 kt. Seas 1 foot or less. Patchy fog in the morning with vsby 1 NM or less. .THU NIGHT...S winds 10 to 15 kt, becoming SW 5 to 10 kt after midnight. Seas around 2 ft. Patchy fog after midnight. .FRI...W winds 5 to 10 kt, becoming N in the afternoon. Seas 1 foot or less. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 to 3 NM in the morning. .FRI NIGHT...NE winds 5 to 10 kt. Seas 1 foot or less. A chance of showers in the evening. .SAT AND SAT NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. .SUN AND SUN NIGHT...SW winds 10 to 15 kt, becoming W 15 to 20 kt. Seas 2 to 3 ft. Showers likely. .MON AND MON NIGHT...NW winds 15 to 20 kt, diminishing to 10 to 15 kt. Seas 2 to 3 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-161200- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 702 PM EDT Wed Apr 15 2026 .TONIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas 2 to 3 ft. Patchy fog. A slight chance of tstms. A slight chance of showers this evening, then a chance of showers after midnight. 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 NM or less. .THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Patchy fog after midnight with vsby 1 NM or less. .FRI...SW winds 5 to 10 kt, becoming NW in the afternoon. Seas 2 to 4 ft. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 NM or less in the morning. .FRI NIGHT AND SAT...E winds 5 to 10 kt. Seas 2 to 3 ft. .SAT NIGHT...E winds 5 to 10 kt, becoming S after midnight. Seas 2 to 3 ft. .SUN...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Showers likely. .SUN NIGHT...W winds 20 to 25 kt. Seas 3 to 5 ft. A chance of showers. .MON AND MON NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 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. $$ ANZ255-161200- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 702 PM EDT Wed Apr 15 2026 .TONIGHT...SW winds 5 to 10 kt. Seas around 3 ft. Patchy fog. A slight chance of showers and tstms. Vsby 1 NM or less. .THU...SW winds 10 to 15 kt. Seas 3 to 4 ft. Patchy fog in the morning with vsby 1 NM or less. .THU NIGHT...SW winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Seas 3 to 4 ft. Patchy fog after midnight with vsby 1 NM or less. .FRI...SW winds 10 to 15 kt, becoming W 5 to 10 kt in the afternoon. Seas 3 to 4 ft. Patchy fog in the morning with vsby 1 NM or less. .FRI NIGHT AND SAT...E winds 5 to 10 kt. Seas 2 to 4 ft. .SAT NIGHT...E winds 5 to 10 kt, becoming SE after midnight. Seas 2 to 3 ft. .SUN...SW winds 15 to 20 kt. Seas 2 to 4 ft. A chance of showers. .SUN NIGHT...W winds 20 to 25 kt. Seas 5 to 7 ft. A chance of showers. .MON...W winds 20 to 25 kt. Seas 5 to 7 ft. .MON NIGHT...NW winds 20 to 25 kt. Seas 3 to 5 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-161200- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 702 PM EDT Wed Apr 15 2026 .TONIGHT...SW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Gusts up to 20 kt. Seas 3 to 4 ft. A slight chance of tstms. A slight chance of showers this evening, then a chance of showers after midnight. Patchy fog after midnight with 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 NM or less. .THU NIGHT...SW winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Seas 3 to 4 ft. Patchy fog after midnight with vsby 1 NM or less. .FRI...SW winds 10 to 15 kt, becoming W 5 to 10 kt in the afternoon. Seas 3 to 4 ft. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 NM or less in the morning. .FRI NIGHT...NE winds around 10 kt. Seas 3 to 4 ft. A chance of showers in the evening. .SAT AND SAT NIGHT...SE winds 10 to 15 kt. Seas 2 to 3 ft. .SUN...SW winds 15 to 20 kt. Seas 2 to 4 ft. Showers likely. .SUN NIGHT...W winds 20 to 25 kt. Seas 4 to 6 ft. Showers likely. .MON...W winds 20 to 25 kt. Seas 4 to 6 ft. .MON NIGHT...NW winds 20 to 25 kt. Seas 3 to 5 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. $$ ANZ232-161200- Nantucket Sound- 702 PM EDT Wed Apr 15 2026 .TONIGHT...S winds 5 to 10 kt. Seas around 2 ft. Patchy fog. A slight chance of tstms. A slight chance of showers this evening, then a chance of showers after midnight. Vsby 1 NM or less. .THU...SW winds 5 to 10 kt. Seas around 2 ft. Patchy fog in the morning with vsby 1 to 3 NM. .THU NIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Patchy fog after midnight with vsby 1 to 3 NM. .FRI...SW winds 5 to 10 kt, becoming NW in the afternoon. Seas around 2 ft. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 NM or less in the morning. .FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. A chance of showers in the evening. .SAT AND SAT NIGHT...S winds 5 to 10 kt. Seas around 2 ft. .SUN...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Showers likely. .SUN NIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of showers. .MON AND MON NIGHT...NW winds 15 to 20 kt. Seas 2 to 4 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-161200- Vineyard Sound- 702 PM EDT Wed Apr 15 2026 .TONIGHT...S winds 5 to 10 kt. Seas around 2 ft. Patchy fog. A slight chance of tstms. A slight chance of showers this evening, then a chance of showers after midnight. Vsby 1 to 3 NM, decreasing to 1 NM or less after midnight. .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 NM or less. .THU NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Patchy fog after midnight with vsby 1 to 3 NM. .FRI...W winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 NM or less in the morning. .FRI NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers in the evening. .SAT AND SAT NIGHT...SE winds 5 to 10 kt. Seas around 2 ft. .SUN AND SUN NIGHT...SW winds 10 to 15 kt, becoming W 15 to 20 kt. Gusts up to 25 kt. Seas 2 to 4 ft. Showers likely. .MON AND MON NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 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. $$ ANZ234-161200- Buzzards Bay- 702 PM EDT Wed Apr 15 2026 .TONIGHT...S winds 5 to 10 kt. Seas around 2 ft. Patchy fog. A slight chance of tstms. A slight chance of showers this evening, then a chance of showers after midnight. Vsby 1 NM or less. .THU...SW winds 5 to 10 kt. Seas around 2 ft. Patchy fog in the morning with vsby 1 NM or less. .THU NIGHT...SW winds 10 to 15 kt. Seas around 2 ft. .FRI...SW winds 5 to 10 kt, becoming W in the afternoon. Seas around 2 ft. Patchy fog in the morning. A chance of showers in the afternoon. .FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. A chance of showers in the evening. .SAT AND SAT NIGHT...SE winds 5 to 10 kt. Seas around 2 ft. .SUN AND SUN NIGHT...SW winds 10 to 15 kt, becoming W 15 to 20 kt. Seas 2 to 3 ft. Showers likely. .MON AND MON NIGHT...W winds 15 to 20 kt, becoming NW 10 to 15 kt. Seas 2 to 3 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-161200- Rhode Island Sound- 702 PM EDT Wed Apr 15 2026 .TONIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. A slight chance of tstms. A slight chance of showers this evening, then a chance of showers after midnight. 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 NM or less. .THU NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas around 3 ft. Patchy fog after midnight with vsby 1 to 3 NM. .FRI...SW winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 NM or less in the morning. .FRI NIGHT...NE winds around 10 kt. Seas 2 to 3 ft. A chance of showers in the evening. .SAT AND SAT NIGHT...SE winds around 10 kt. Seas 2 to 3 ft. .SUN AND SUN NIGHT...SW winds 15 to 20 kt, becoming W 20 to 25 kt. Seas 2 to 4 ft. Showers likely. .MON AND MON NIGHT...W winds 20 to 25 kt, becoming NW 15 to 20 kt. Seas 2 to 4 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. $$ ANZ237-161200- Block Island Sound- 702 PM EDT Wed Apr 15 2026 .TONIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. A chance of tstms this evening, then a slight chance of tstms after midnight. Patchy fog after midnight with vsby 1 NM or less. .THU...SW winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 2 to 3 ft. Patchy fog in the morning with vsby 1 NM or less. .THU NIGHT...SW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. Patchy fog after midnight with vsby 1 NM or less. .FRI...W winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 to 3 NM in the morning. .FRI NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers in the evening. .SAT AND SAT NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. .SUN...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Showers likely. .SUN NIGHT...W winds 15 to 20 kt. Seas 2 to 4 ft. Showers likely with a chance of snow showers. .MON AND MON NIGHT...NW winds 15 to 20 kt. Seas 2 to 3 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-161200- Boston Harbor- 702 PM EDT Wed Apr 15 2026 .TONIGHT...E winds 5 to 10 kt. Waves 1 foot or less. Patchy fog. A slight chance of showers and tstms this evening. Showers likely with a chance of tstms after midnight. 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 NM or less. .THU NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Waves 1 foot or less. Patchy fog. A chance of showers. .FRI...NW winds 5 to 10 kt, becoming NE in the afternoon. Waves 1 foot or less. A chance of showers. .FRI NIGHT...NE winds 5 to 10 kt. Waves 1 foot or less. A chance of showers in the evening. .SAT...NE winds 5 to 10 kt. Waves 1 foot or less. .SAT NIGHT...E winds 5 to 10 kt, becoming SE after midnight. Waves 1 foot or less. A chance of showers after midnight. .SUN AND SUN NIGHT...SW winds 10 to 15 kt, becoming W 15 to 20 kt. Waves around 2 ft. Showers likely. .MON AND MON NIGHT...NW winds 15 to 20 kt, diminishing to 10 to 15 kt. Waves around 2 ft. 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. $$ ANZ236-161200- Narragansett Bay- 702 PM EDT Wed Apr 15 2026 .TONIGHT...S winds 5 to 10 kt. Waves around 2 ft. A chance of showers. A chance of tstms this evening, then a slight chance of tstms after midnight. Patchy fog after midnight with vsby 1 NM or less. .THU...S winds 5 to 10 kt. Waves around 2 ft. Patchy fog in the morning with vsby 1 NM or less. .THU NIGHT...SW winds 5 to 10 kt. Waves around 2 ft. .FRI...W winds 5 to 10 kt. Waves around 2 ft. A chance of showers in the afternoon. .FRI NIGHT...NE winds 5 to 10 kt. Waves around 2 ft. A chance of showers in the evening. .SAT AND SAT NIGHT...SE winds 5 to 10 kt. Waves around 2 ft. .SUN AND SUN NIGHT...SW winds 10 to 15 kt, becoming W. Gusts up to 20 kt. Waves around 2 ft. Showers likely. .MON AND MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. Winds and waves higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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