818
FZUS51 KBOX 020503
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
103 AM EDT Tue Sep 2 2025

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

ANZ200-021800-
103 AM EDT Tue Sep 2 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
High pressure will continue to dominate through the middle of next
week. Northeast wind could lead to some areas of rip currents along
east-facing beaches through the first half of the week. Expect dry
conditions and winds less than 25 kts through Thursday, although
seas may start to build tonight into Tuesday. Next chance for
precipitation comes Friday.

$$

ANZ250-021800-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
103 AM EDT Tue Sep 2 2025

.REST OF TONIGHT...NE winds around 5 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 9 seconds and NE 1 foot at 3 seconds.
.TUE...E winds around 5 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 8 seconds and NE 1 foot at 3 seconds.
.TUE NIGHT...SE winds around 5 kt. Seas 2 to 3 ft. Wave Detail:
SE 3 ft at 9 seconds.
.WED...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft
at 8 seconds and S 1 foot at 3 seconds. Patchy dense fog in the
morning with vsby 1 NM or less.
.WED NIGHT...S winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: E
4 ft at 8 seconds and S 2 ft at 3 seconds.
.THU AND THU NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: S 3 ft at 3 seconds and E 3 ft at
8 seconds.
.FRI AND FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt.
Seas 2 to 4 ft.
.SAT AND SAT NIGHT...S winds 10 to 15 kt, becoming SW. Gusts up
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.

$$

ANZ251-021800-
Massachusetts Bay and Ipswich Bay-
103 AM EDT Tue Sep 2 2025

.REST OF TONIGHT...NE winds around 5 kt. Seas 1 foot or less.
Wave Detail: NE 1 foot at 3 seconds and E 1 foot at 8 seconds.
Patchy fog. Vsby 1 NM or less.
.TUE...NE winds around 5 kt, becoming E in the afternoon. Seas
1 foot or less, then around 2 ft in the afternoon. Wave Detail:
NE 1 foot at 3 seconds and E 1 foot at 8 seconds, becoming E 2 ft
at 8 seconds and NE 1 foot at 3 seconds. Patchy fog in the
morning with vsby 1 NM or less.
.TUE NIGHT...SE winds 5 to 10 kt, becoming S after midnight. Seas
2 to 3 ft. Wave Detail: E 3 ft at 8 seconds. Patchy fog after
midnight with vsby 1 NM or less.
.WED...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft
at 9 seconds and SE 1 foot at 3 seconds. Patchy dense fog in the
morning with vsby 1 NM or less.
.WED NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 8 seconds and SE 2 ft at 4 seconds.
.THU AND 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 10 to 15 kt with gusts up to 25 kt.
Seas 2 to 3 ft.
.SAT AND SAT NIGHT...S winds 10 to 15 kt, becoming W. 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.

$$

ANZ231-021800-
Cape Cod Bay-
103 AM EDT Tue Sep 2 2025

.REST OF TONIGHT...E winds around 5 kt. Seas 1 foot or less. Wave
Detail: NE 1 foot at 3 seconds and E 1 foot at 7 seconds.
.TUE...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 E 2 ft at 8 seconds and E 1 foot at
2 seconds.
.TUE NIGHT...E winds around 5 kt. Seas around 2 ft. Wave Detail:
E 2 ft at 8 seconds and E 1 foot at 2 seconds.
.WED...NE winds around 5 kt, becoming SE in the afternoon. Seas
around 2 ft. Wave Detail: E 2 ft at 8 seconds and SE 1 foot at
2 seconds. Patchy fog in the morning with vsby 1 NM or less.
.WED NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
2 ft at 8 seconds and S 1 foot at 2 seconds.
.THU AND THU NIGHT...S winds 5 to 10 kt. 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 10 to 15 kt with gusts up to 25 kt.
Seas 2 to 4 ft.
.SAT AND SAT NIGHT...SW 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.

$$

ANZ254-021800-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
103 AM EDT Tue Sep 2 2025

.REST OF TONIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: NE 2 ft at 4 seconds and E 2 ft at 8 seconds.
.TUE...NE winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: SE 4 ft
at 8 seconds and N 1 foot at 3 seconds.
.TUE NIGHT...E winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: E
4 ft at 8 seconds. Patchy fog after midnight with vsby 1 NM or
less.
.WED...E winds around 5 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft
at 8 seconds. Patchy dense fog in the morning with vsby 1 NM or
less.
.WED NIGHT THROUGH THU NIGHT...S winds 5 to 10 kt. Seas 2 to
3 ft. Wave Detail: E 3 ft at 8 seconds and SE 2 ft at 3 seconds.
.FRI AND FRI NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: SE 4 ft at 8 seconds and SE 3 ft at
4 seconds.
.SAT AND SAT NIGHT...SW winds 10 to 15 kt with gusts up 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.

$$

ANZ255-021800-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
103 AM EDT Tue Sep 2 2025

.REST OF TONIGHT...E winds around 10 kt. Seas 2 to 3 ft. Wave
Detail: E 2 ft at 6 seconds.
.TUE...NE winds around 10 kt. Seas 2 to 4 ft. Wave Detail: E 4 ft
at 8 seconds and NE 1 foot at 4 seconds.
.TUE NIGHT...E winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: E
4 ft at 8 seconds and NE 1 foot at 3 seconds. Patchy fog after
midnight with vsby 1 NM or less.
.WED...NE winds 5 to 10 kt, becoming E in the afternoon. Seas
2 to 4 ft. Wave Detail: E 4 ft at 8 seconds. Patchy dense fog in
the morning with vsby 1 NM or less.
.WED NIGHT...S winds around 5 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 8 seconds.
.THU AND THU NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: E 3 ft at 8 seconds and S 2 ft at 3 seconds.
.FRI AND FRI NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft.
.SAT AND SAT NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt.
Seas 3 to 5 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.

$$

ANZ256-021800-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
103 AM EDT Tue Sep 2 2025

.REST OF TONIGHT...E winds around 10 kt. Seas 2 to 3 ft. Wave
Detail: E 3 ft at 7 seconds and NE 1 foot at 4 seconds.
.TUE...E winds 10 to 15 kt. Seas 2 to 4 ft. Wave Detail: SE 4 ft
at 8 seconds and NE 1 foot at 3 seconds.
.TUE NIGHT...E winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE
4 ft at 8 seconds.
.WED...NE winds 5 to 10 kt, becoming SE in the afternoon. Seas
2 to 4 ft. Wave Detail: E 4 ft at 8 seconds. Patchy dense fog in
the morning with vsby 1 NM or less.
.WED NIGHT...S winds around 5 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 8 seconds.
.THU AND THU NIGHT...S winds 5 to 10 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 10 to 15 kt with gusts up to 20 kt.
Seas 3 to 5 ft.
.SAT AND SAT NIGHT...SW winds 10 to 15 kt, becoming W. Gusts up
to 20 kt. Seas 3 to 5 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.

$$

ANZ232-021800-
Nantucket Sound-
103 AM EDT Tue Sep 2 2025

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

$$

ANZ233-021800-
Vineyard Sound-
103 AM EDT Tue Sep 2 2025

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

$$

ANZ234-021800-
Buzzards Bay-
103 AM EDT Tue Sep 2 2025

.REST OF TONIGHT...NE winds 5 to 10 kt. Seas 1 foot or less. Wave
Detail: NE 1 foot at 2 seconds and SE 1 foot at 7 seconds.
.TUE...NE winds 5 to 10 kt. Seas 1 foot or less, then around 2 ft
in the afternoon. Wave Detail: NE 1 foot at 2 seconds and SE
1 foot at 8 seconds, becoming SE 2 ft at 8 seconds and NE 1 foot
at 2 seconds.
.TUE NIGHT...E winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 8 seconds and E 1 foot at 2 seconds.
.WED...NE winds around 5 kt, becoming S in the afternoon. Seas
around 2 ft in the morning, then 1 foot or less. Wave Detail: SE
2 ft at 8 seconds, becoming S 1 foot at 2 seconds and SE 1 foot
at 8 seconds. Patchy fog in the morning with vsby 1 NM or less.
.WED NIGHT THROUGH THU NIGHT...S winds 5 to 10 kt. Seas around
2 ft. Wave Detail: S 2 ft at 3 seconds and SE 2 ft at 8 seconds.
.FRI AND FRI NIGHT...S winds 10 to 15 kt with gusts up to 25 kt.
Seas 2 to 4 ft. Wave Detail: SE 2 ft at 4 seconds and SE 2 ft at
7 seconds.
.SAT AND SAT NIGHT...SW 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.

$$

ANZ235-021800-
Rhode Island Sound-
103 AM EDT Tue Sep 2 2025

.REST OF TONIGHT...NE winds around 10 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 7 seconds and NE 1 foot at 3 seconds.
.TUE...E winds around 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 8 seconds and NE 1 foot at 3 seconds.
.TUE NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 8 seconds and NE 1 foot at 2 seconds.
.WED...NE winds around 5 kt, becoming SE in the afternoon. Seas
2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and S 1 foot at
3 seconds. Patchy fog in the morning with vsby 1 NM or less.
.WED NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 8 seconds and S 1 foot at 3 seconds.
.THU AND THU NIGHT...S winds 10 to 15 kt. Seas around 2 ft. Wave
Detail: SE 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.
.FRI NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas
3 to 5 ft.
.SAT AND SAT NIGHT...SW winds 10 to 15 kt, becoming W. Gusts up
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.

$$

ANZ237-021800-
Block Island Sound-
103 AM EDT Tue Sep 2 2025

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

$$

ANZ230-021800-
Boston Harbor-
103 AM EDT Tue Sep 2 2025

.REST OF TONIGHT...N winds around 5 kt. Waves 1 foot or less.
.TUE...NE winds around 5 kt, becoming E in the afternoon. Waves
1 foot or less.
.TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight.
Waves 1 foot or less.
.WED...S winds around 5 kt, becoming SE in the afternoon. Waves
1 foot or less.
.WED NIGHT...S winds 5 to 10 kt. Waves 1 foot or less.
.THU AND THU NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Waves around 2 ft.
.FRI THROUGH SAT NIGHT...W winds 15 to 20 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.

$$

ANZ236-021800-
Narragansett Bay-
103 AM EDT Tue Sep 2 2025

.REST OF TONIGHT...NE winds 5 to 10 kt. Waves around 2 ft.
.TUE...NE winds 5 to 10 kt, becoming E in the afternoon. Waves
around 2 ft.
.TUE NIGHT...SE winds 5 to 10 kt, becoming NE after midnight.
Waves around 2 ft.
.WED...NE winds around 5 kt, becoming S in the afternoon. Waves
around 2 ft. Patchy fog in the morning with vsby 1 NM or less.
.WED NIGHT...SW winds 5 to 10 kt. Waves around 2 ft.
.THU AND THU NIGHT...S winds 5 to 10 kt. Waves around 2 ft.
.FRI...S winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to
3 ft.
.FRI NIGHT THROUGH SAT NIGHT...W winds 10 to 15 kt with gusts up
to 20 kt. Waves 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.

$$

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