539
FZUS51 KBOX 031103
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
703 AM EDT Wed Sep 3 2025

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

ANZ200-040000-
703 AM EDT Wed Sep 3 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
High pressure remains in control through Thursday before a cold
front approaches from the west Thursday night. Expect dry conditions
and winds less than 25 kts through Thursday, although seas may start
to build to around 4 feet on the outer waters. Next chance for
precipitation comes Friday and Saturday as the cold front moves
through.

$$

ANZ250-040000-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
703 AM EDT Wed Sep 3 2025

.TODAY...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 8 seconds and SE 1 foot at 2 seconds.
.TONIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 8 seconds and S 1 foot at 2 seconds. Patchy fog after
midnight with vsby 1 to 3 NM.
.THU...S winds 5 to 10 kt, becoming SE 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: E 3 ft at
8 seconds and S 2 ft at 3 seconds. Patchy fog in the morning with
vsby 1 to 3 NM.
.THU NIGHT...S winds 10 to 15 kt with gusts up to 25 kt. Seas
3 to 4 ft. Wave Detail: S 3 ft at 4 seconds and E 3 ft at
8 seconds.
.FRI AND FRI NIGHT...S winds 15 to 20 kt with gusts up to 30 kt.
Seas 3 to 4 ft. Wave Detail: S 4 ft at 4 seconds and E 3 ft at
8 seconds.
.SAT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to
4 ft. Wave Detail: SW 4 ft at 4 seconds and SE 2 ft at 9 seconds.
A chance of showers.
.SAT NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 4 ft. Patchy fog. Showers likely. Vsby 1 to 3 NM.
.SUN AND SUN NIGHT...W winds 10 to 15 kt. Gusts up to 20 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.

$$

ANZ251-040000-
Massachusetts Bay and Ipswich Bay-
703 AM EDT Wed Sep 3 2025

.TODAY...S winds 5 to 10 kt, becoming SE 10 to 15 kt this
afternoon. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and
SE 1 foot at 3 seconds.
.TONIGHT...S winds 10 to 15 kt, becoming SW 5 to 10 kt after
midnight. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and SE
1 foot at 3 seconds. Patchy fog after midnight with vsby 1 to
3 NM.
.THU...S winds 5 to 10 kt, becoming SE 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 4 seconds and E 3 ft at 8 seconds. Patchy fog in the morning
with vsby 1 to 3 NM.
.THU NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: SE 3 ft at 4 seconds and E 3 ft at
8 seconds.
.FRI AND FRI NIGHT...S winds 15 to 20 kt with gusts up to 30 kt.
Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and E 3 ft at
8 seconds.
.SAT...S winds 15 to 20 kt with gusts up to 25 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.
.SAT NIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 3 ft. Patchy fog. Showers likely. Vsby 1 to 3 NM.
.SUN...W winds around 10 kt. Seas around 2 ft. A chance of
showers. Vsby 1 to 3 NM.
.SUN NIGHT...W winds around 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.

$$

ANZ231-040000-
Cape Cod Bay-
703 AM EDT Wed Sep 3 2025

.TODAY...E winds around 5 kt, becoming SE this afternoon. Seas
around 2 ft. Wave Detail: E 2 ft at 8 seconds and SE 1 foot at
2 seconds.
.TONIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
2 ft at 8 seconds and SE 1 foot at 2 seconds. Patchy fog after
midnight with vsby 1 to 3 NM.
.THU...S winds around 5 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: E
2 ft at 8 seconds. Patchy fog in the morning with vsby 1 to 3 NM.
.THU NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and S
1 foot at 3 seconds.
.FRI AND FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt.
Seas 2 to 4 ft. Wave Detail: SW 2 ft at 3 seconds and E 2 ft at
8 seconds.
.SAT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: SW 2 ft at 4 seconds and SE 2 ft at 8 seconds.
.SAT NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 4 ft. Patchy fog. Showers likely. Vsby 1 to 3 NM.
.SUN...NW winds around 10 kt. Seas around 2 ft. Patchy fog.
Showers likely. Vsby 1 to 3 NM.
.SUN NIGHT...W winds 5 to 10 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.

$$

ANZ254-040000-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
703 AM EDT Wed Sep 3 2025

.TODAY...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft
at 8 seconds.
.TONIGHT...SE winds around 5 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 8 seconds. Patchy fog after midnight with vsby 1 to 3 NM.
.THU...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft
at 8 seconds and S 1 foot at 2 seconds.
.THU NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and SW
2 ft at 3 seconds.
.FRI AND FRI NIGHT...S winds 10 to 15 kt with gusts up to 25 kt.
Seas 3 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and E 3 ft at
8 seconds.
.SAT...S winds around 15 kt with gusts up to 25 kt. Seas 3 to
4 ft. Wave Detail: SW 4 ft at 5 seconds and S 3 ft at 8 seconds.
.SAT NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Seas
3 to 4 ft. Showers likely. Vsby 1 to 3 NM.
.SUN...NW winds around 10 kt. Seas 2 to 4 ft. Patchy fog. A
chance of showers. Vsby 1 to 3 NM.
.SUN NIGHT...W winds around 10 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.

$$

ANZ255-040000-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
703 AM EDT Wed Sep 3 2025

.TODAY...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft
at 8 seconds. Patchy fog this morning with vsby 1 to 3 NM.
.TONIGHT...SE winds around 5 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 8 seconds. Patchy fog after midnight with vsby 1 to 3 NM.
.THU...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 7 seconds and S 1 foot at 3 seconds.
.THU NIGHT...S winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 8 seconds and S 2 ft at 3 seconds.
.FRI AND FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt.
Seas 3 to 5 ft. Wave Detail: SW 4 ft at 5 seconds.
.SAT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to
5 ft. Wave Detail: S 4 ft at 7 seconds.
.SAT NIGHT...SW winds 15 to 20 kt. Seas 3 to 5 ft. Showers
likely. Vsby 1 to 3 NM.
.SUN AND SUN NIGHT...NW winds 10 to 15 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.

$$

ANZ256-040000-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
703 AM EDT Wed Sep 3 2025

.TODAY...NE winds 5 to 10 kt, becoming SE this afternoon. Seas
3 to 4 ft. Wave Detail: E 4 ft at 8 seconds.
.TONIGHT...S winds around 5 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 8 seconds. Patchy fog after midnight with vsby 1 to 3 NM.
.THU...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at
7 seconds and S 1 foot at 3 seconds. Patchy fog in the morning
with vsby 1 to 3 NM.
.THU NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas 3 to 4 ft. Wave Detail: S 3 ft at 4 seconds and SE
3 ft at 8 seconds.
.FRI AND FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt.
Seas 3 to 5 ft. Wave Detail: S 4 ft at 6 seconds.
.SAT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to
5 ft. Wave Detail: S 5 ft at 7 seconds.
.SAT NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas
4 to 5 ft. Patchy fog. Showers likely. Vsby 1 to 3 NM.
.SUN...NW winds 10 to 15 kt. Seas 3 to 4 ft. Patchy fog. Showers
likely. Vsby 1 to 3 NM.
.SUN NIGHT...NW winds 10 to 15 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.

$$

ANZ232-040000-
Nantucket Sound-
703 AM EDT Wed Sep 3 2025

.TODAY...E winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
2 ft at 8 seconds. Patchy fog this morning with vsby 1 to 3 NM.
.TONIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
2 ft at 8 seconds and SE 1 foot at 3 seconds. Patchy fog after
midnight with vsby 1 to 3 NM.
.THU...S winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 3 seconds and
E 1 foot at 8 seconds.
.THU NIGHT...S winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
S 2 ft at 3 seconds and E 1 foot at 8 seconds.
.FRI AND FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt.
Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot
at 8 seconds.
.SAT...S winds 15 to 20 kt with gusts up to 25 kt. Seas around
3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at
7 seconds.
.SAT NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 3 ft. Showers likely. Vsby 1 to 3 NM.
.SUN...NW winds 10 to 15 kt. Seas 2 to 3 ft. Showers likely. Vsby
1 to 3 NM.
.SUN NIGHT...W 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.

$$

ANZ233-040000-
Vineyard Sound-
703 AM EDT Wed Sep 3 2025

.TODAY...NE winds around 5 kt, becoming SE this afternoon. Seas
around 2 ft. Wave Detail: SE 1 foot at 2 seconds and SE 1 foot at
8 seconds. Patchy fog this morning with vsby 1 to 3 NM.
.TONIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
1 foot at 2 seconds and SE 1 foot at 8 seconds.
.THU...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S
1 foot at 2 seconds and SE 1 foot at 8 seconds. Patchy fog in the
morning with vsby 1 to 3 NM.
.THU NIGHT...S winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
S 2 ft at 4 seconds and SE 1 foot at 8 seconds.
.FRI AND FRI NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt.
Seas 2 to 4 ft. Wave Detail: S 3 ft at 6 seconds and SW 1 foot at
3 seconds.
.SAT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: S 3 ft at 7 seconds and SW 1 foot at
3 seconds.
.SAT NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Seas
2 to 4 ft. Patchy fog. Showers likely. Vsby 1 to 3 NM.
.SUN...NW winds around 10 kt. Seas 2 to 3 ft. Showers likely.
Vsby 1 to 3 NM.
.SUN NIGHT...NW 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.

$$

ANZ234-040000-
Buzzards Bay-
703 AM EDT Wed Sep 3 2025

.TODAY...NE winds around 5 kt, becoming SE this afternoon. Seas
1 foot or less. Wave Detail: SE 1 foot at 2 seconds and SE 1 foot
at 8 seconds. Patchy fog this morning with vsby 1 to 3 NM.
.TONIGHT...SW winds 5 to 10 kt. Seas 1 foot or less. Wave Detail:
S 1 foot at 2 seconds and SE 1 foot at 8 seconds. Patchy fog
after midnight with vsby 1 to 3 NM.
.THU...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 1 foot or less, then around
2 ft in the afternoon. Wave Detail: S 1 foot at 2 seconds and SE
1 foot at 8 seconds, becoming S 1 foot at 3 seconds and SE 1 foot
at 7 seconds. Patchy fog in the morning with vsby 1 to 3 NM.
.THU NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
around 2 ft. Wave Detail: SW 2 ft at 3 seconds and SE 1 foot at
8 seconds.
.FRI AND FRI NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt.
Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and SE 2 ft at
8 seconds.
.SAT...S winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to
4 ft. Wave Detail: S 3 ft at 7 seconds and SW 1 foot at
3 seconds.
.SAT NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 4 ft. Patchy fog. Showers likely. Vsby 1 to 3 NM.
.SUN...NW winds around 10 kt. Seas around 2 ft. A chance of
showers. Vsby 1 to 3 NM.
.SUN NIGHT...NW winds around 10 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.

$$

ANZ235-040000-
Rhode Island Sound-
703 AM EDT Wed Sep 3 2025

.TODAY...NE winds around 5 kt, becoming SE this afternoon. Seas
2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds.
.TONIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 8 seconds. Patchy fog after midnight with vsby 1 to 3 NM.
.THU...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft
at 3 seconds and SE 2 ft at 7 seconds. Patchy fog in the morning
with vsby 1 to 3 NM.
.THU NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and SE
2 ft at 8 seconds.
.FRI...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: SW 3 ft at 5 seconds and SE 2 ft at 8 seconds.
.FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 5 ft. Wave Detail: S 5 ft at 7 seconds and SW 1 foot at
4 seconds.
.SAT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to
4 ft.
.SAT NIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 5 ft. Patchy fog. Showers likely. Vsby 1 to 3 NM.
.SUN AND SUN NIGHT...NW winds 10 to 15 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.

$$

ANZ237-040000-
Block Island Sound-
703 AM EDT Wed Sep 3 2025

.TODAY...NE winds around 5 kt, becoming SE this afternoon. Seas
2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds.
.TONIGHT...SW winds around 5 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 8 seconds. Patchy fog after midnight with vsby 1 to 3 NM.
.THU...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft at
3 seconds and SE 2 ft at 8 seconds. Patchy fog in the morning
with vsby 1 to 3 NM.
.THU NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas 2 to 3 ft. Wave Detail: S 2 ft at 4 seconds and SE
2 ft at 7 seconds.
.FRI...S winds 10 to 15 kt, increasing to 15 to 20 kt in the
afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW
3 ft at 4 seconds and SE 2 ft at 8 seconds.
.FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 5 ft. Wave Detail: SW 4 ft at 5 seconds and SE 3 ft at
8 seconds.
.SAT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to
4 ft. A chance of showers.
.SAT NIGHT...W winds 10 to 15 kt with gusts up to 25 kt. Seas
2 to 4 ft. Patchy fog. Showers likely. Vsby 1 to 3 NM.
.SUN...NW winds 10 to 15 kt. Seas 2 to 3 ft. Showers likely. Vsby
1 to 3 NM.
.SUN NIGHT...NW winds 10 to 15 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.

$$

ANZ230-040000-
Boston Harbor-
703 AM EDT Wed Sep 3 2025

.TODAY...S winds around 5 kt, becoming SE 10 to 15 kt this
afternoon. Waves 1 foot or less, then around 2 ft this afternoon.
.TONIGHT...S winds 5 to 10 kt, becoming SW after midnight. Waves
around 2 ft in the evening, then 1 foot or less.
.THU...S winds 5 to 10 kt, becoming SE 10 to 15 kt with gusts up
to 20 kt in the afternoon. Waves 1 foot or less, then 2 to 3 ft
in the afternoon.
.THU NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Waves around 2 ft. A chance of showers after midnight.
.FRI AND FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt.
Waves around 2 ft.
.SAT...S winds 15 to 20 kt with gusts up to 25 kt. Waves around
2 ft. A chance of showers.
.SAT NIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Waves
around 2 ft. Patchy fog. Showers likely. Vsby 1 to 3 NM.
.SUN...W winds 5 to 10 kt. Waves 1 foot or less. Showers likely.
Vsby 1 to 3 NM.
.SUN NIGHT...W winds 5 to 10 kt. Waves 1 foot or less.

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.

$$

ANZ236-040000-
Narragansett Bay-
703 AM EDT Wed Sep 3 2025

.TODAY...NE winds around 5 kt, becoming S this afternoon. Waves
around 2 ft. Patchy fog this morning with vsby 1 to 3 NM.
.TONIGHT...S winds 5 to 10 kt, becoming SW after midnight. Waves
around 2 ft. Patchy fog after midnight with vsby 1 to 3 NM.
.THU...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Waves around 2 ft. Patchy fog in
the morning with vsby 1 to 3 NM.
.THU NIGHT...S winds 10 to 15 kt. Waves around 2 ft.
.FRI AND FRI NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt.
Waves 2 to 3 ft.
.SAT...S winds 15 to 20 kt with gusts up to 25 kt. Waves 2 to
3 ft. A chance of showers.
.SAT NIGHT...W winds 10 to 15 kt with gusts up to 25 kt. Waves
2 to 3 ft. Patchy fog. Showers likely. Vsby 1 to 3 NM.
.SUN...NW winds 5 to 10 kt. Waves around 2 ft. Showers likely.
Vsby 1 to 3 NM.
.SUN NIGHT...NW winds 5 to 10 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.

$$

For the latest updates...please visit our webpage at
www.weather.gov/boston

You can follow us on Facebook at
www.facebook.com/NWSBoston

You can follow us on Twitter at
@NWSBoston