105
FZUS51 KBOX 282006
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
405 PM EDT Thu Aug 28 2025

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

ANZ200-290900-
405 PM EDT Thu Aug 28 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
High pressure provides tranquil weather for the MA and RI waters
through Friday morning. A cold front approaches Southern New England
Friday evening and will be accompanied by scattered showers and
thunderstorms. The front exits offshore late Friday night, followed
by high pressure building back into the region for the holiday
weekend and possibly lingering into much of next week. This will
provide an extended period of tranquil boating conditions.

$$

ANZ250-290900-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
405 PM EDT Thu Aug 28 2025

.TONIGHT...S winds 10 to 15 kt with gusts up to 30 kt. Seas 2 to
3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 2 ft at 8 seconds.
.FRI...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: S 3 ft at 4 seconds and E 2 ft at 8 seconds. A
chance of showers in the afternoon with vsby 1 to 3 NM.
.FRI NIGHT...S winds 10 to 15 kt, becoming W after midnight.
Gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at
4 seconds and E 1 foot at 8 seconds. A chance of showers. Vsby
1 to 3 NM in the evening.
.SAT...NW winds around 10 kt, becoming SW in the afternoon. Seas
around 2 ft. Wave Detail: W 1 foot at 3 seconds and SE 1 foot at
5 seconds.
.SAT NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Seas around 2 ft. Wave Detail: W 2 ft at 3 seconds and SE 1 foot
at 7 seconds.
.SUN AND SUN NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: NW 2 ft at 3 seconds and SE 2 ft at 8 seconds.
.MON THROUGH TUE NIGHT...S winds 5 to 10 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.

$$

ANZ251-290900-
Massachusetts Bay and Ipswich Bay-
405 PM EDT Thu Aug 28 2025

.TONIGHT...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: SE 2 ft at 4 seconds and E 2 ft at 9 seconds.
.FRI...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: S 2 ft at 4 seconds and E 1 foot at 8 seconds.
Showers with a chance of tstms in the afternoon with vsby 1 to
3 NM.
.FRI NIGHT...SW winds 5 to 10 kt with gusts up to 20 kt, becoming
W after midnight. Seas 2 to 3 ft. Wave Detail: SE 2 ft at
4 seconds and SW 1 foot at 2 seconds. A chance of showers. A
chance of tstms in the evening with vsby 1 to 3 NM.
.SAT...NW winds around 10 kt, becoming SW in the afternoon. Seas
around 2 ft. Wave Detail: NW 1 foot at 2 seconds and SE 1 foot at
4 seconds.
.SAT NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Seas 1 foot or less, then around 2 ft after midnight. Wave
Detail: W 1 foot at 2 seconds and SE 1 foot at 4 seconds,
becoming NW 1 foot at 2 seconds and SE 1 foot at 4 seconds.
.SUN AND SUN NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: N 1 foot at 3 seconds and SE 1 foot at 5 seconds.
.MON THROUGH TUE NIGHT...S winds 5 to 10 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.

$$

ANZ231-290900-
Cape Cod Bay-
405 PM EDT Thu Aug 28 2025

.TONIGHT...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: S 1 foot at 4 seconds and E 1 foot at
9 seconds.
.FRI...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: S 1 foot at 4 seconds and E 1 foot at
8 seconds. A chance of showers in the afternoon.
.FRI NIGHT...S winds 5 to 10 kt with gusts up to 20 kt, becoming
W after midnight. Seas 2 to 3 ft. Wave Detail: S 1 foot at
4 seconds and E 1 foot at 8 seconds. A chance of showers.
.SAT...NW winds 5 to 10 kt. Seas around 2 ft in the morning, then
1 foot or less. Wave Detail: NW 1 foot at 3 seconds and SE 1 foot
at 5 seconds.
.SAT NIGHT...SW winds 5 to 10 kt, becoming NW after midnight.
Seas 1 foot or less. Wave Detail: S 1 foot at 4 seconds and SE
1 foot at 8 seconds.
.SUN AND SUN NIGHT...NW winds 5 to 10 kt. Seas 1 foot or less.
Wave Detail: NW 1 foot at 3 seconds and N 1 foot at 3 seconds.
.MON THROUGH TUE NIGHT...S winds 5 to 10 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.

$$

ANZ254-290900-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
405 PM EDT Thu Aug 28 2025

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

$$

ANZ255-290900-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
405 PM EDT Thu Aug 28 2025

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

$$

ANZ256-290900-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
405 PM EDT Thu Aug 28 2025

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

$$

ANZ232-290900-
Nantucket Sound-
405 PM EDT Thu Aug 28 2025

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

$$

ANZ233-290900-
Vineyard Sound-
405 PM EDT Thu Aug 28 2025

.TONIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at
9 seconds.
.FRI...S winds around 10 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at
8 seconds. A chance of showers and tstms in the afternoon.
.FRI NIGHT...SW winds around 10 kt with gusts up to 20 kt,
becoming NW after midnight. Seas 2 to 3 ft. Wave Detail: SW 2 ft
at 5 seconds and SE 1 foot at 8 seconds. A chance of showers. A
chance of tstms in the evening.
.SAT...NW winds 5 to 10 kt, becoming W in the afternoon. Seas
around 2 ft. Wave Detail: SW 1 foot at 5 seconds and SE 1 foot at
8 seconds.
.SAT NIGHT...W winds around 10 kt, becoming NW after midnight.
Seas around 2 ft. Wave Detail: SW 1 foot at 5 seconds and SE
1 foot at 8 seconds.
.SUN AND SUN NIGHT...NW winds 5 to 10 kt. Seas 1 foot or less.
Wave Detail: NW 1 foot at 3 seconds and N 1 foot at 3 seconds.
.MON THROUGH TUE NIGHT...SE winds 5 to 10 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.

$$

ANZ234-290900-
Buzzards Bay-
405 PM EDT Thu Aug 28 2025

.TONIGHT...S winds around 10 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at
9 seconds.
.FRI...S winds around 10 kt with gusts up to 20 kt. Seas 2 to
4 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at
8 seconds. A chance of showers and tstms in the afternoon.
.FRI NIGHT...SW winds 5 to 10 kt with gusts up to 20 kt, becoming
W after midnight. Seas 2 to 3 ft. Wave Detail: SW 2 ft at
5 seconds and SE 1 foot at 3 seconds. A chance of showers. A
chance of tstms in the evening.
.SAT...W winds 5 to 10 kt. Seas around 2 ft. Wave Detail: W
1 foot at 4 seconds and SE 1 foot at 5 seconds.
.SAT NIGHT...W winds around 10 kt, becoming NW after midnight.
Seas around 2 ft in the evening, then 1 foot or less. Wave
Detail: SW 1 foot at 4 seconds and SE 1 foot at 8 seconds,
becoming W 1 foot at 4 seconds and S 1 foot at 5 seconds.
.SUN AND SUN NIGHT...NW winds 5 to 10 kt. Seas 1 foot or less.
Wave Detail: NW 1 foot at 3 seconds and SE 1 foot at 7 seconds.
.MON THROUGH TUE NIGHT...SE winds 5 to 10 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.

$$

ANZ235-290900-
Rhode Island Sound-
405 PM EDT Thu Aug 28 2025

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

$$

ANZ237-290900-
Block Island Sound-
405 PM EDT Thu Aug 28 2025

.TONIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to
4 ft. Wave Detail: SW 2 ft at 4 seconds and SE 2 ft at 9 seconds.
A slight chance of showers and tstms after midnight.
.FRI...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: SE 2 ft at 7 seconds and W 1 foot at
3 seconds. A chance of showers and tstms in the afternoon.
.FRI NIGHT...W winds 5 to 10 kt, becoming NW after midnight.
Gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at
4 seconds and SE 1 foot at 8 seconds. A chance of showers. A
chance of tstms in the evening.
.SAT...NW winds around 10 kt, becoming W in the afternoon. Seas
around 2 ft. Wave Detail: NW 1 foot at 3 seconds and S 1 foot at
5 seconds.
.SAT NIGHT...W winds around 10 kt, becoming NW after midnight.
Seas around 2 ft. Wave Detail: W 1 foot at 3 seconds and SE
1 foot at 7 seconds.
.SUN AND SUN NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 7 seconds and NW 1 foot at 2 seconds.
.MON THROUGH TUE NIGHT...SE winds 5 to 10 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.

$$

ANZ230-290900-
Boston Harbor-
405 PM EDT Thu Aug 28 2025

.TONIGHT...S winds around 10 kt with gusts up to 25 kt. Waves
around 2 ft.
.FRI...S winds 10 to 15 kt with gusts up to 25 kt. Waves around
2 ft. A chance of showers in the morning, then showers with a
chance of tstms in the afternoon with vsby 1 to 3 NM.
.FRI NIGHT...SW winds 5 to 10 kt, becoming W after midnight.
Waves around 2 ft. Showers with a chance of tstms in the evening,
then a chance of showers after midnight. Vsby 1 to 3 NM in the
evening.
.SAT...W winds 5 to 10 kt. Waves around 2 ft in the morning, then
1 foot or less.
.SAT NIGHT...W winds 5 to 10 kt. Waves 1 foot or less.
.SUN AND SUN NIGHT...NW winds 5 to 10 kt. Waves 1 foot or less.
.MON THROUGH TUE NIGHT...S winds 5 to 10 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.

$$

ANZ236-290900-
Narragansett Bay-
405 PM EDT Thu Aug 28 2025

.TONIGHT...S winds 5 to 10 kt with gusts up to 20 kt. Waves 2 to
3 ft.
.FRI...S winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Gusts up to 20 kt. Waves 2 to 3 ft. Showers likely
with a chance of tstms in the afternoon.
.FRI NIGHT...SW winds 5 to 10 kt with gusts up to 20 kt, becoming
NW after midnight. Waves around 2 ft. A chance of showers. A
chance of tstms in the evening.
.SAT...W winds 5 to 10 kt. Waves around 2 ft in the morning, then
1 foot or less.
.SAT NIGHT...W winds 5 to 10 kt. Waves 1 foot or less.
.SUN AND SUN NIGHT...NW winds 5 to 10 kt. Waves 1 foot or less.
.MON THROUGH TUE NIGHT...S winds 5 to 10 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.

$$

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