Coastal Waters Forecast
Issued by NWS Boston, MA

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FZUS51 KBOX 300503
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
103 AM EDT Wed Jul 30 2025

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

ANZ200-301800-
103 AM EDT Wed Jul 30 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
Weak high pressure remains along the eastern seaboard through
Wednesday. A cold front moves north to south across the New England
waters Thursday and then stalls south of the MA/RI waters Fri, as
low pressure develops on the front and tracks northeast. Gusty NE
winds and heavy rain will impact the MA/RI waters Friday into
Saturday morning. Then large, sprawling high pressure builds across
New England later Saturday into Sunday, providing fine summer
boating weather.

$$

ANZ250-301800-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
103 AM EDT Wed Jul 30 2025

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

$$

ANZ251-301800-
Massachusetts Bay and Ipswich Bay-
103 AM EDT Wed Jul 30 2025

.REST OF TONIGHT...N winds 5 to 10 kt. Seas 1 foot or less. Wave
Detail: SW 1 foot at 3 seconds and NE 1 foot at 8 seconds.
.WED...N winds around 5 kt, becoming SE in the afternoon. Seas
1 foot or less, then around 2 ft in the afternoon. Wave Detail:
SE 1 foot at 3 seconds and NE 1 foot at 6 seconds, becoming SE
1 foot at 3 seconds and E 1 foot at 6 seconds.
.WED NIGHT...SW winds around 10 kt, becoming N after midnight.
Seas around 2 ft. Wave Detail: S 2 ft at 3 seconds and NE 2 ft at
7 seconds.
.THU...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 SE 1 foot
at 3 seconds. A chance of showers.
.THU NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 5 seconds.
Showers likely. Vsby 1 to 3 NM after midnight.
.FRI...NE winds around 15 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: NE 4 ft at 5 seconds. Showers likely, mainly
in the morning with vsby 1 to 3 NM.
.FRI NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 4 ft. A chance of showers in the evening.
.SAT THROUGH SUN NIGHT...SW 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.

$$

ANZ231-301800-
Cape Cod Bay-
103 AM EDT Wed Jul 30 2025

.REST OF TONIGHT...NW winds 5 to 10 kt. Seas 1 foot or less. Wave
Detail: NW 1 foot at 3 seconds and E 1 foot at 8 seconds.
.WED...N winds around 5 kt, becoming SE in the afternoon. Seas
1 foot or less, then around 2 ft in the afternoon. Wave Detail: E
1 foot at 3 seconds and NE 1 foot at 6 seconds, becoming S 1 foot
at 2 seconds and E 1 foot at 6 seconds.
.WED NIGHT...SW winds around 10 kt, becoming W after midnight.
Seas around 2 ft. Wave Detail: SW 1 foot at 2 seconds and E
1 foot at 5 seconds.
.THU...NE winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. Wave Detail: N 2 ft at 3 seconds. A chance of showers.
.THU NIGHT AND FRI...NE winds 15 to 20 kt with gusts up to 25 kt.
Seas 2 to 4 ft. Wave Detail: N 3 ft at 4 seconds. A chance of
showers in the evening, then showers likely through the day. A
chance of showers in the afternoon.
.FRI NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 4 ft. Wave Detail: N 3 ft at 4 seconds. A chance of showers
in the evening.
.SAT THROUGH SUN NIGHT...SW 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.

$$

ANZ254-301800-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
103 AM EDT Wed Jul 30 2025

.REST OF TONIGHT...W winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: NW 2 ft at 4 seconds and SE 1 foot at 8 seconds. Patchy
fog. Vsby 1 NM or less.
.WED...W winds 5 to 10 kt, becoming SW in the afternoon. Seas
around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at
8 seconds. Patchy fog. Vsby 1 NM or less.
.WED NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and
SE 1 foot at 8 seconds. Patchy fog. Vsby 1 NM or less.
.THU...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: N 3 ft at 5 seconds. A chance of showers.
Patchy fog in the morning with vsby 1 NM or less.
.THU NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: NE 3 ft at 5 seconds and SW 1 foot at
4 seconds. A chance of showers.
.FRI...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to
5 ft. Wave Detail: E 5 ft at 6 seconds. Showers likely, mainly in
the morning. Vsby 1 to 3 NM in the afternoon.
.FRI NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 5 ft. A chance of showers in the evening with vsby 1 to
3 NM.
.SAT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to
5 ft.
.SAT NIGHT THROUGH SUN NIGHT...S winds 5 to 10 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.

$$

ANZ255-301800-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
103 AM EDT Wed Jul 30 2025

.REST OF TONIGHT...W winds 10 to 15 kt. Seas 2 to 3 ft. Wave
Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. Patchy
fog. Vsby 1 NM or less.
.WED...SW winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds
and SE 1 foot at 8 seconds. Patchy fog. Vsby 1 NM or less.
.WED NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail:
SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. Patchy fog. Vsby
1 NM or less.
.THU...N winds 10 to 15 kt, becoming NE in the afternoon. Gusts
up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds
and NE 2 ft at 7 seconds. Patchy fog in the morning. A chance of
showers in the afternoon. Vsby 1 NM or less in the morning.
.THU NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 3 ft. Wave Detail: NE 3 ft at 5 seconds and SW 2 ft at
5 seconds. A chance of showers.
.FRI...NE winds 20 to 25 kt. Seas 3 to 5 ft. Wave Detail: NE 5 ft
at 6 seconds. Showers likely. Vsby 1 to 3 NM in the afternoon.
.FRI NIGHT...NE winds around 20 kt with gusts up to 25 kt. Seas
4 to 5 ft. A chance of showers. Vsby 1 to 3 NM in the evening.
.SAT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to
5 ft.
.SAT NIGHT THROUGH SUN NIGHT...S winds 10 to 15 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.

$$

ANZ256-301800-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
103 AM EDT Wed Jul 30 2025

.REST OF TONIGHT...W winds 10 to 15 kt. Seas 2 to 3 ft. Wave
Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. Patchy
fog. Vsby 1 NM or less.
.WED...SW winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds
and SE 1 foot at 8 seconds. Patchy fog. Vsby 1 NM or less.
.WED NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SE
1 foot at 8 seconds. Patchy fog after midnight with vsby 1 NM or
less.
.THU...N winds 10 to 15 kt, becoming NE in the afternoon. Gusts
up to 20 kt. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 5 seconds
and W 3 ft at 5 seconds. Patchy fog in the morning. A chance of
showers in the afternoon. Vsby 1 NM or less in the morning.
.THU NIGHT AND FRI...NE winds 20 to 25 kt with gusts up to 30 kt.
Seas 3 to 5 ft. Wave Detail: NE 5 ft at 6 seconds and SW 1 foot
at 5 seconds. A chance of showers in the evening, then showers
likely. Vsby 1 to 3 NM.
.FRI NIGHT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas
4 to 6 ft. Wave Detail: NE 6 ft at 6 seconds and NW 1 foot at
6 seconds. A chance of showers in the evening.
.SAT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to
6 ft.
.SAT NIGHT THROUGH SUN NIGHT...S winds 10 to 15 kt with gusts up
to 20 kt. Seas 3 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.

$$

ANZ232-301800-
Nantucket Sound-
103 AM EDT Wed Jul 30 2025

.REST OF TONIGHT...W winds 10 to 15 kt. Seas around 2 ft. Wave
Detail: W 2 ft at 4 seconds and E 1 foot at 8 seconds.
.WED...W winds 5 to 10 kt, becoming SW 10 to 15 kt in the
afternoon. Seas 1 foot or less, then around 2 ft in the
afternoon. Wave Detail: SW 1 foot at 4 seconds and NE 1 foot at
6 seconds, becoming SW 2 ft at 3 seconds and SE 1 foot at
8 seconds. Patchy fog. Vsby 1 NM or less.
.WED NIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
SW 2 ft at 3 seconds and SE 1 foot at 8 seconds. Patchy fog after
midnight with vsby 1 NM or less.
.THU...NE winds 10 to 15 kt with gusts up to 20 kt. Seas around
2 ft. Wave Detail: NE 2 ft at 3 seconds and W 2 ft at 4 seconds.
A chance of showers.
.THU NIGHT AND FRI...NE winds 15 to 20 kt with gusts up to 25 kt.
Seas 2 to 3 ft. Wave Detail: NE 3 ft at 5 seconds and SW 1 foot
at 5 seconds. A chance of showers in the evening, then showers
likely.
.FRI NIGHT...NE winds around 20 kt with gusts up to 25 kt. Seas
3 to 4 ft. Wave Detail: N 4 ft at 5 seconds. A chance of showers
in the evening.
.SAT THROUGH SUN NIGHT...SW winds 15 to 20 kt with gusts up to
25 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.

$$

ANZ233-301800-
Vineyard Sound-
103 AM EDT Wed Jul 30 2025

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

$$

ANZ234-301800-
Buzzards Bay-
103 AM EDT Wed Jul 30 2025

.REST OF TONIGHT...W winds 5 to 10 kt. Seas 1 foot or less. Wave
Detail: W 1 foot at 4 seconds and SE 1 foot at 8 seconds.
.WED...W winds 5 to 10 kt, becoming SW 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 4 seconds and E 1 foot
at 7 seconds, becoming SW 2 ft at 3 seconds and SE 1 foot at
8 seconds. Patchy fog in the morning with vsby 1 to 3 NM.
.WED NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and
SE 1 foot at 8 seconds. Patchy fog after midnight with vsby 1 to
3 NM.
.THU...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: NE 2 ft at 3 seconds and W 1 foot at
5 seconds. A chance of showers.
.THU NIGHT AND FRI...NE winds 15 to 20 kt with gusts up to 25 kt.
Seas 2 to 4 ft. Wave Detail: NE 3 ft at 4 seconds and SW 1 foot
at 5 seconds. A chance of showers in the evening, then showers
likely.
.FRI NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 4 ft. Wave Detail: N 3 ft at 5 seconds. A chance of showers
in the evening.
.SAT THROUGH SUN NIGHT...SW 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.

$$

ANZ235-301800-
Rhode Island Sound-
103 AM EDT Wed Jul 30 2025

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

$$

ANZ237-301800-
Block Island Sound-
103 AM EDT Wed Jul 30 2025

.REST OF TONIGHT...W winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: W 2 ft at 4 seconds and SE 1 foot at 8 seconds. Patchy
fog. Vsby 1 NM or less.
.WED...W winds 5 to 10 kt, becoming SW in the afternoon. Seas
around 2 ft. Wave Detail: S 2 ft at 4 seconds and SE 1 foot at
8 seconds. Patchy fog in the morning with vsby 1 NM or less.
.WED NIGHT...SW winds around 10 kt. Seas around 2 ft. Wave
Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. Patchy
fog after midnight with vsby 1 NM or less.
.THU...NE winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Seas 2 to 3 ft. Wave Detail: SW 2 ft at 5 seconds and E 2 ft at
8 seconds. A chance of showers. Patchy fog in the morning with
vsby 1 to 3 NM.
.THU NIGHT AND FRI...NE winds 15 to 20 kt with gusts up to 25 kt.
Seas 2 to 4 ft. Wave Detail: E 4 ft at 5 seconds and S 1 foot at
4 seconds. Showers likely. Vsby 1 to 3 NM.
.FRI NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 4 ft. Wave Detail: NE 4 ft at 6 seconds. A chance of showers
in the evening.
.SAT AND SAT NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt,
becoming S 5 to 10 kt. Seas 2 to 4 ft.
.SUN AND SUN NIGHT...SW 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.

$$

ANZ230-301800-
Boston Harbor-
103 AM EDT Wed Jul 30 2025

.REST OF TONIGHT...N winds around 5 kt. Waves 1 foot or less.
.WED...NE winds around 5 kt, becoming SE in the afternoon. Waves
1 foot or less.
.WED NIGHT...SW winds 5 to 10 kt, becoming N after midnight.
Waves 1 foot or less.
.THU...NE winds 10 to 15 kt. Waves around 2 ft. A chance of
showers.
.THU NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Waves around 2 ft. Showers likely. Vsby 1 to 3 NM after
midnight.
.FRI...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to
3 ft. Showers likely, mainly in the morning.
.FRI NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Waves around 2 ft in the evening, then 1 foot or less. A
chance of showers in the evening.
.SAT THROUGH SUN NIGHT...SW winds 10 to 15 kt. Waves 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.

$$

ANZ236-301800-
Narragansett Bay-
103 AM EDT Wed Jul 30 2025

.REST OF TONIGHT...W winds 5 to 10 kt. Waves 1 foot or less.
.WED...NW winds around 5 kt, becoming S in the afternoon. Waves
1 foot or less, then around 2 ft in the afternoon.
.WED NIGHT...SW winds 5 to 10 kt. Waves around 2 ft.
.THU...NE winds 10 to 15 kt. Gusts up to 20 kt in the afternoon.
Waves around 2 ft. A chance of showers.
.THU NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Waves
2 to 3 ft. Showers likely.
.FRI...NE winds around 15 kt with gusts up to 25 kt. Waves 2 to
3 ft. Showers likely. Vsby 1 to 3 NM in the morning.
.FRI NIGHT...NE winds 10 to 15 kt with gusts up to 25 kt. Waves
2 to 3 ft. A chance of showers in the evening.
.SAT THROUGH SUN NIGHT...SW winds 10 to 15 kt with gusts up to
20 kt. Waves 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.

$$

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