154
FZUS51 KBOX 312304
CWFBOX

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

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

ANZ200-011200-
704 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.

$$

ANZ250-011200-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
704 PM EDT Sun Aug 31 2025

.TONIGHT...S winds around 5 kt, becoming N 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: SE
2 ft at 8 seconds and N 1 foot at 3 seconds.
.MON NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 9 seconds and NE 1 foot at 3 seconds.
.TUE...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: E 3 ft at 8 seconds and NE 2 ft at 4 seconds.
.TUE NIGHT...E winds 5 to 10 kt, becoming SW after midnight. Seas
3 to 5 ft. Wave Detail: E 4 ft at 8 seconds and NE 1 foot at
3 seconds.
.WED...SW winds around 10 kt, becoming S with gusts up to 20 kt
in the afternoon. Seas 3 to 5 ft. Wave Detail: E 4 ft at
8 seconds and S 1 foot at 3 seconds.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 4 ft.
.THU AND THU NIGHT...S winds 10 to 15 kt with gusts up to 25 kt.
Seas 2 to 3 ft.
.FRI AND FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt.
Seas 2 to 4 ft. A chance of showers. Vsby 1 to 3 NM.

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.

$$

ANZ251-011200-
Massachusetts Bay and Ipswich Bay-
704 PM EDT Sun Aug 31 2025

.TONIGHT...S winds 5 to 10 kt, becoming N after midnight. Seas
around 2 ft. Wave Detail: E 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: E 2 ft
at 8 seconds and NE 1 foot at 2 seconds.
.MON NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
NE 1 foot at 3 seconds and E 1 foot at 7 seconds.
.TUE...NE winds around 10 kt. Seas 2 to 3 ft. Wave Detail: NE
2 ft at 4 seconds and E 2 ft at 8 seconds.
.TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight.
Seas 2 to 4 ft. Wave Detail: E 3 ft at 8 seconds and NE 2 ft at
4 seconds.
.WED AND WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: E 3 ft at 8 seconds and S 2 ft at
4 seconds.
.THU AND THU NIGHT...S winds 10 to 15 kt with gusts up to 25 kt.
Seas 2 to 3 ft.
.FRI AND FRI NIGHT...S winds 10 to 15 kt with gusts up to 25 kt.
Seas 2 to 3 ft. A chance of showers. Vsby 1 to 3 NM.

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.

$$

ANZ231-011200-
Cape Cod Bay-
704 PM EDT Sun Aug 31 2025

.TONIGHT...NE winds around 5 kt. Seas 1 foot or less. Wave
Detail: N 1 foot at 4 seconds and SE 1 foot at 8 seconds.
.MON...NE winds 5 to 10 kt. Seas 1 foot or less, then around 2 ft
in the afternoon. Wave Detail: N 1 foot at 3 seconds and E 1 foot
at 8 seconds, becoming N 1 foot at 3 seconds and E 1 foot at
7 seconds.
.MON NIGHT...NE winds around 10 kt. Seas around 2 ft. Wave
Detail: NE 1 foot at 3 seconds and E 1 foot at 8 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 and E 2 ft at 8 seconds.
.TUE NIGHT...NE winds 5 to 10 kt, becoming W after midnight. Seas
around 2 ft. Wave Detail: E 2 ft at 8 seconds and N 1 foot at
3 seconds.
.WED AND WED NIGHT...SW winds 5 to 10 kt with gusts up to 20 kt.
Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and W 1 foot
at 2 seconds.
.THU AND THU NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 ft.
.FRI AND FRI NIGHT...S winds 10 to 15 kt with 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.

$$

ANZ254-011200-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
704 PM EDT Sun Aug 31 2025

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

$$

ANZ255-011200-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
704 PM EDT Sun Aug 31 2025

.TONIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 8 seconds and NE 1 foot at 3 seconds.
.MON...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: NE 3 ft at 4 seconds and SE 2 ft at 7 seconds.
.MON NIGHT...NE winds around 15 kt with gusts up to 20 kt. Seas
2 to 4 ft. Wave Detail: NE 3 ft at 4 seconds and E 3 ft at
7 seconds.
.TUE...NE winds 15 to 20 kt. Seas 3 to 5 ft. Wave Detail: E 4 ft
at 8 seconds and NE 2 ft at 4 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 4 ft
at 8 seconds and N 1 foot at 3 seconds.
.WED AND WED NIGHT...SW winds 5 to 10 kt. Seas 2 to 4 ft. Wave
Detail: E 4 ft at 8 seconds and NW 1 foot at 2 seconds.
.THU AND THU NIGHT...S winds 10 to 15 kt. Seas 2 to 3 ft.
.FRI AND FRI NIGHT...S winds 15 to 20 kt. Seas 2 to 4 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.

$$

ANZ256-011200-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
704 PM EDT Sun Aug 31 2025

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

$$

ANZ232-011200-
Nantucket Sound-
704 PM EDT Sun Aug 31 2025

.TONIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: N
1 foot at 3 seconds and E 1 foot at 8 seconds.
.MON...NE winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Seas around 2 ft. Wave Detail: NE 2 ft at 4 seconds and E 1 foot
at 7 seconds.
.MON NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas around 2 ft. Wave Detail: E 2 ft at 3 seconds and E
1 foot at 7 seconds.
.TUE...NE winds around 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: NE 2 ft at 4 seconds and E 2 ft at 8 seconds.
.TUE NIGHT...NE winds 10 to 15 kt, becoming NW after midnight.
Seas 2 to 3 ft. Wave Detail: N 2 ft at 3 seconds and E 2 ft at
8 seconds.
.WED AND WED NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave
Detail: SW 2 ft at 3 seconds and E 2 ft at 8 seconds.
.THU AND THU NIGHT...S winds 10 to 15 kt. Seas around 2 ft.
.FRI AND FRI NIGHT...S winds 15 to 20 kt with 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.

$$

ANZ233-011200-
Vineyard Sound-
704 PM EDT Sun Aug 31 2025

.TONIGHT...NE winds 5 to 10 kt. Seas 1 foot or less. Wave Detail:
NE 1 foot at 2 seconds and W 1 foot at 4 seconds.
.MON...NE winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Seas around 2 ft. Wave Detail: NE 1 foot at 2 seconds and SE
1 foot at 7 seconds.
.MON NIGHT...NE winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
NE 1 foot at 3 seconds and SE 1 foot at 8 seconds.
.TUE...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SE 2 ft at 8 seconds and NE 1 foot at
3 seconds.
.TUE NIGHT...NE winds 5 to 10 kt, becoming NW after midnight.
Seas 2 to 3 ft. Wave Detail: SE 2 ft at 8 seconds and NW 1 foot
at 2 seconds.
.WED AND WED NIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Wave
Detail: W 1 foot at 2 seconds and NE 1 foot at 4 seconds.
.THU AND THU NIGHT...S winds 10 to 15 kt. Seas around 2 ft.
.FRI AND FRI NIGHT...S winds 15 to 20 kt with 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.

$$

ANZ234-011200-
Buzzards Bay-
704 PM EDT Sun Aug 31 2025

.TONIGHT...NE winds 5 to 10 kt. Seas 1 foot or less. Wave Detail:
NE 1 foot at 2 seconds and NW 1 foot at 4 seconds.
.MON...NE winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: NE
1 foot at 2 seconds and SE 1 foot at 7 seconds.
.MON NIGHT...NE winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
NE 1 foot at 3 seconds and SE 1 foot at 8 seconds.
.TUE...NE winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. Wave Detail: SE 2 ft at 8 seconds and NE 1 foot at
3 seconds.
.TUE NIGHT...NE winds 5 to 10 kt, becoming NW after midnight.
Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and NW 1 foot
at 2 seconds.
.WED AND WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and W 1 foot
at 2 seconds.
.THU AND THU NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 ft.
.FRI AND FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt.
Seas 2 to 4 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.

$$

ANZ235-011200-
Rhode Island Sound-
704 PM EDT Sun Aug 31 2025

.TONIGHT...E winds 5 to 10 kt, becoming NE after midnight. Seas
around 2 ft. Wave Detail: SE 2 ft at 8 seconds and E 1 foot at
2 seconds.
.MON...NE winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Seas around 2 ft. Wave Detail: NE 2 ft at 3 seconds and SE 2 ft
at 7 seconds.
.MON NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: E 3 ft at 5 seconds.
.TUE...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: SE 3 ft at 8 seconds and NE 2 ft at 3 seconds.
.TUE NIGHT...E winds 5 to 10 kt, becoming W after midnight. Seas
2 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and NW 1 foot at
2 seconds.
.WED AND WED NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave
Detail: SE 3 ft at 8 seconds and SW 2 ft at 3 seconds.
.THU AND THU NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt. Seas
2 to 3 ft.
.FRI AND FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt.
Seas 2 to 4 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.

$$

ANZ237-011200-
Block Island Sound-
704 PM EDT Sun Aug 31 2025

.TONIGHT...E winds around 5 kt, becoming NE after midnight. Seas
around 2 ft. Wave Detail: SE 2 ft at 8 seconds and E 1 foot at
2 seconds.
.MON...NE winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Seas around 2 ft. Wave Detail: NE 2 ft at 3 seconds and SE 2 ft
at 7 seconds.
.MON NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: E 3 ft at 6 seconds.
.TUE...NE winds 10 to 15 kt. Seas 2 to 4 ft. Wave Detail: SE 3 ft
at 8 seconds and NE 2 ft at 5 seconds.
.TUE NIGHT...SE winds 5 to 10 kt, becoming W after midnight. Seas
3 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and E 1 foot at
4 seconds.
.WED AND WED NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: SE 3 ft at 8 seconds and SW 1 foot at 3 seconds.
.THU...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft.
.THU NIGHT AND FRI...S winds 10 to 15 kt. Gusts up to 25 kt. Seas
2 to 3 ft. A chance of showers.
.FRI NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
around 3 ft. A chance of showers and tstms.

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.

$$

ANZ230-011200-
Boston Harbor-
704 PM EDT Sun Aug 31 2025

.TONIGHT...S winds 5 to 10 kt, becoming NW after midnight. Waves
1 foot or less.
.MON...NE winds 5 to 10 kt. 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 AND WED NIGHT...SW winds 10 to 15 kt. Waves around 2 ft.
.THU AND THU NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Waves around 2 ft.
.FRI...S winds 10 to 15 kt with gusts up to 25 kt. Waves around
2 ft. Showers likely. Vsby 1 to 3 NM.
.FRI NIGHT...S winds 10 to 15 kt with gusts up to 25 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.

$$

ANZ236-011200-
Narragansett Bay-
704 PM EDT Sun Aug 31 2025

.TONIGHT...SE winds 5 to 10 kt, becoming NE after midnight. Waves
1 foot or less.
.MON...NE winds 5 to 10 kt. Waves around 2 ft.
.MON NIGHT...NE winds 5 to 10 kt. Waves around 2 ft.
.TUE...NE winds around 10 kt. Waves around 2 ft. Patchy fog in
the morning with vsby 1 to 3 NM.
.TUE NIGHT...SE winds 5 to 10 kt, becoming W after midnight.
Waves around 2 ft.
.WED AND WED NIGHT...SW winds 10 to 15 kt. Waves around 2 ft.
.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. Waves around 2 ft. A chance of
showers.
.FRI AND FRI NIGHT...S winds 10 to 15 kt with gusts up to 25 kt.
Waves 2 to 3 ft. A chance of showers and tstms.

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.

$$

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