519
FZUS51 KBOX 311704
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
104 PM EDT Sun Aug 31 2025

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 25 NM

ANZ200-010600-
104 PM EDT Sun Aug 31 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
High pressure will continue to build into the Northeast Sunday, and
remain anchored over the region into the middle of next week. Expect
dry conditions and winds less than 25 kts through Thursday. Next
chance for precipitation comes Friday.

$$

ANZ250-010600-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
104 PM EDT Sun Aug 31 2025

.THIS AFTERNOON...E winds around 5 kt. Seas 2 to 3 ft. Wave
Detail: SE 2 ft at 8 seconds and NW 1 foot at 3 seconds.
.TONIGHT...S winds around 5 kt, becoming NW after midnight. Seas
around 2 ft. Wave Detail: SE 2 ft at 8 seconds and N 1 foot at
3 seconds.
.MON...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE
2 ft at 7 seconds and N 1 foot at 2 seconds.
.MON NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
E 2 ft at 7 seconds.
.TUE...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: E 4 ft at 9 seconds.
.TUE NIGHT...E winds around 10 kt, becoming W after midnight.
Seas 3 to 5 ft. Wave Detail: E 5 ft at 9 seconds.
.WED...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
5 ft.
.WED NIGHT THROUGH THU NIGHT...S winds 10 to 15 kt with gusts up
to 25 kt. Seas 2 to 4 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.

$$

ANZ251-010600-
Massachusetts Bay and Ipswich Bay-
104 PM EDT Sun Aug 31 2025

.THIS AFTERNOON...E winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: E 2 ft at 7 seconds and NW 1 foot at 3 seconds.
.TONIGHT...S winds 5 to 10 kt, becoming NW after midnight. Seas
around 2 ft. Wave Detail: E 2 ft at 7 seconds and SE 1 foot at
2 seconds.
.MON...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE
2 ft at 7 seconds and N 1 foot at 2 seconds.
.MON NIGHT...NE winds 5 to 10 kt. Seas around 2 ft in the
evening, then 1 foot or less. Wave Detail: NE 2 ft at 5 seconds,
becoming NE 1 foot at 6 seconds.
.TUE...NE winds around 10 kt. Seas around 2 ft. Wave Detail: E
2 ft at 8 seconds.
.TUE NIGHT...SE winds around 10 kt, becoming SW after midnight.
Seas 2 to 4 ft. Wave Detail: E 4 ft at 9 seconds.
.WED THROUGH THU NIGHT...S winds 10 to 15 kt with gusts up to
25 kt. Seas 2 to 4 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.

$$

ANZ231-010600-
Cape Cod Bay-
104 PM EDT Sun Aug 31 2025

.THIS AFTERNOON...NE winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: N 1 foot at 3 seconds and NE 1 foot at 6 seconds.
.TONIGHT...SE winds around 5 kt, becoming NW after midnight. Seas
1 foot or less. Wave Detail: N 1 foot at 3 seconds and NE 1 foot
at 6 seconds.
.MON...NE winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: N
1 foot at 3 seconds and NE 1 foot at 6 seconds.
.MON NIGHT...NE winds 5 to 10 kt. Seas 1 foot or less, then
around 2 ft after midnight. Wave Detail: NE 1 foot at 3 seconds.
.TUE...NE winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. Wave Detail: N 2 ft at 3 seconds.
.TUE NIGHT...N winds 5 to 10 kt, becoming W after midnight. Seas
around 2 ft. Wave Detail: NE 2 ft at 6 seconds and N 1 foot at
3 seconds.
.WED THROUGH THU NIGHT...S 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.

$$

ANZ254-010600-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
104 PM EDT Sun Aug 31 2025

.THIS AFTERNOON...N winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: E 2 ft at 8 seconds and NW 1 foot at 4 seconds.
.TONIGHT...NE winds around 5 kt. Seas 2 to 3 ft. Wave Detail: SE
2 ft at 8 seconds and NW 1 foot at 4 seconds.
.MON...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE
2 ft at 7 seconds and N 1 foot at 3 seconds.
.MON NIGHT...NE winds 5 to 10 kt, increasing to 10 to 15 kt with
gusts up to 20 kt after midnight. Seas 2 to 3 ft. Wave Detail: E
3 ft at 8 seconds.
.TUE...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
5 ft. Wave Detail: E 5 ft at 8 seconds.
.TUE NIGHT...N winds 10 to 15 kt with gusts up to 20 kt, becoming
NW after midnight. Seas 3 to 5 ft. Wave Detail: E 5 ft at
9 seconds.
.WED...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
5 ft.
.WED NIGHT THROUGH THU NIGHT...SE winds 10 to 15 kt with gusts up
to 20 kt. Seas 2 to 4 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.

$$

ANZ255-010600-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
104 PM EDT Sun Aug 31 2025

.THIS AFTERNOON...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: NE 2 ft at 7 seconds and W 1 foot at 4 seconds.
.TONIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
2 ft at 7 seconds and W 1 foot at 4 seconds.
.MON...NE winds around 10 kt. Seas 2 to 3 ft. Wave Detail: NE
3 ft at 6 seconds.
.MON NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: E 3 ft at 8 seconds.
.TUE...NE winds 15 to 20 kt. Seas 3 to 5 ft. Wave Detail: E 5 ft
at 8 seconds.
.TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt,
becoming NW after midnight. Seas 3 to 5 ft. Wave Detail: E 5 ft
at 9 seconds and NW 1 foot at 3 seconds.
.WED...SW winds 10 to 15 kt. Seas 3 to 5 ft.
.WED NIGHT THROUGH THU NIGHT...SE winds 10 to 15 kt with gusts up
to 20 kt. Seas 2 to 4 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.

$$

ANZ256-010600-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
104 PM EDT Sun Aug 31 2025

.THIS AFTERNOON...SE winds around 5 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 7 seconds and W 1 foot at 3 seconds.
.TONIGHT...SE winds around 5 kt, becoming NE after midnight. Seas
around 2 ft. Wave Detail: SE 2 ft at 8 seconds and SW 1 foot at
3 seconds.
.MON...NE winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: NE 3 ft
at 7 seconds.
.MON NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: E 3 ft at 8 seconds.
.TUE...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
4 ft. Wave Detail: E 4 ft at 8 seconds.
.TUE NIGHT...E winds 10 to 15 kt, becoming W after midnight. Seas
4 to 5 ft. Wave Detail: E 5 ft at 9 seconds.
.WED THROUGH THU...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft.
.THU NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
around 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.

$$

ANZ232-010600-
Nantucket Sound-
104 PM EDT Sun Aug 31 2025

.THIS AFTERNOON...NE winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: NW 1 foot at 3 seconds and NE 1 foot at 6 seconds.
.TONIGHT...E winds 5 to 10 kt, becoming NE after midnight. Seas
around 2 ft in the evening, then 1 foot or less. Wave Detail: NW
1 foot at 3 seconds and E 1 foot at 7 seconds, becoming N 1 foot
at 4 seconds and E 1 foot at 7 seconds.
.MON...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE
2 ft at 4 seconds.
.MON NIGHT...NE winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
E 2 ft at 4 seconds.
.TUE...NE winds around 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: NE 3 ft at 5 seconds.
.TUE NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt,
becoming W after midnight. Seas 2 to 3 ft. Wave Detail: NE 3 ft
at 7 seconds and NW 1 foot at 3 seconds.
.WED THROUGH THU NIGHT...S 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.

$$

ANZ233-010600-
Vineyard Sound-
104 PM EDT Sun Aug 31 2025

.THIS AFTERNOON...SE winds around 5 kt. Seas around 2 ft. Wave
Detail: SW 1 foot at 3 seconds and SE 1 foot at 5 seconds.
.TONIGHT...SE winds around 5 kt, becoming N after midnight. Seas
1 foot or less. Wave Detail: S 1 foot at 3 seconds and SE 1 foot
at 6 seconds.
.MON...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE
1 foot at 4 seconds.
.MON NIGHT...NE winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
NE 1 foot at 3 seconds.
.TUE...NE winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. Wave Detail: NE 2 ft at 4 seconds.
.TUE NIGHT...NE winds 10 to 15 kt, becoming W after midnight.
Seas around 2 ft. Wave Detail: E 2 ft at 7 seconds and W 1 foot
at 2 seconds.
.WED THROUGH THU...S winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 ft.
.THU NIGHT...S winds 10 to 15 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.

$$

ANZ234-010600-
Buzzards Bay-
104 PM EDT Sun Aug 31 2025

.THIS AFTERNOON...SE winds 5 to 10 kt. Seas 1 foot or less. Wave
Detail: SW 1 foot at 3 seconds and SE 1 foot at 4 seconds.
.TONIGHT...S winds around 5 kt, becoming NW after midnight. Seas
1 foot or less. Wave Detail: SE 1 foot at 4 seconds.
.MON...NE winds 5 to 10 kt. Seas 1 foot or less, then around 2 ft
in the afternoon. Wave Detail: NE 1 foot at 3 seconds, becoming
NE 1 foot at 2 seconds.
.MON NIGHT...NE winds 10 to 15 kt. Seas 1 foot or less, then
around 2 ft after midnight. Wave Detail: NE 1 foot at 2 seconds.
.TUE...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: NE 1 foot at 3 seconds.
.TUE NIGHT...NE winds 10 to 15 kt, becoming W after midnight.
Seas around 2 ft. Wave Detail: E 2 ft at 6 seconds and W 1 foot
at 2 seconds.
.WED THROUGH THU NIGHT...S 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.

$$

ANZ235-010600-
Rhode Island Sound-
104 PM EDT Sun Aug 31 2025

.THIS AFTERNOON...S winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 7 seconds and SW 1 foot at 3 seconds.
.TONIGHT...SE winds 5 to 10 kt, becoming N after midnight. Seas
around 2 ft. Wave Detail: SE 2 ft at 8 seconds and S 1 foot at
3 seconds.
.MON...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE
2 ft at 7 seconds.
.MON NIGHT...NE winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
E 2 ft at 7 seconds.
.TUE...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: E 3 ft at 7 seconds.
.TUE NIGHT...E winds 10 to 15 kt, becoming SW after midnight.
Seas 2 to 4 ft. Wave Detail: E 4 ft at 9 seconds and W 1 foot at
2 seconds.
.WED THROUGH THU...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft.
.THU NIGHT...S winds 10 to 15 kt with gusts up to 20 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.

$$

ANZ237-010600-
Block Island Sound-
104 PM EDT Sun Aug 31 2025

.THIS AFTERNOON...S winds around 5 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 7 seconds and SW 1 foot at 3 seconds.
.TONIGHT...S winds 5 to 10 kt, becoming NE after midnight. Seas
around 2 ft. Wave Detail: SE 2 ft at 8 seconds and S 1 foot at
2 seconds.
.MON...NE winds 5 to 10 kt, becoming E in the afternoon. Seas
around 2 ft. Wave Detail: E 2 ft at 7 seconds.
.MON NIGHT...NE winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
E 2 ft at 6 seconds.
.TUE...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: E 3 ft at 8 seconds.
.TUE NIGHT...SE winds around 10 kt, becoming SW after midnight.
Seas 2 to 4 ft. Wave Detail: SE 4 ft at 9 seconds.
.WED THROUGH THU...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft.
.THU NIGHT...S winds 10 to 15 kt with gusts up to 20 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.

$$

ANZ230-010600-
Boston Harbor-
104 PM EDT Sun Aug 31 2025

.THIS AFTERNOON...E winds 5 to 10 kt. Waves 1 foot or less.
.TONIGHT...SE winds 5 to 10 kt, becoming NW after midnight. Waves
1 foot or less.
.MON...N winds 5 to 10 kt, becoming NE in the afternoon. Waves
1 foot or less, then around 2 ft in the afternoon.
.MON NIGHT...NE winds 5 to 10 kt. Waves 1 foot or less.
.TUE...NE winds 5 to 10 kt. Waves 1 foot or less, then around
2 ft in the afternoon.
.TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight.
Waves around 2 ft in the evening, then 1 foot or less.
.WED THROUGH THU...S winds 10 to 15 kt with gusts up to 20 kt.
Waves around 2 ft.
.THU NIGHT...S 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.

$$

ANZ236-010600-
Narragansett Bay-
104 PM EDT Sun Aug 31 2025

.THIS AFTERNOON...S winds 5 to 10 kt. Waves around 2 ft.
.TONIGHT...S winds 5 to 10 kt, becoming NW after midnight. Waves
1 foot or less.
.MON...NE winds 5 to 10 kt, becoming E in the afternoon. Waves
1 foot or less, then around 2 ft in the afternoon.
.MON NIGHT...NE winds 5 to 10 kt. Waves around 2 ft.
.TUE...NE winds around 10 kt. Waves around 2 ft.
.TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight.
Waves around 2 ft.
.WED THROUGH THU...S winds 10 to 15 kt with gusts up to 20 kt.
Waves around 2 ft.
.THU NIGHT...S 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.

$$

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