Sandy Bay Weather Center
Weather Center


X

ANZ230 Boston Harbor

Expires:202609170600;;553546
FZUS51 KBOX 161705
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
104 PM EDT Wed Sep 16 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ230-170600-
Boston Harbor-
104 PM EDT Wed Sep 16 2026

.THIS AFTERNOON...S winds 5 to 10 kt. Waves 1 foot or less. 
.TONIGHT...SW winds 5 to 10 kt, diminishing to around 5 kt after
midnight. Waves 1 foot or less. 
.THU...N winds around 5 kt, becoming E in the afternoon. Waves
1 foot or less. 
.THU NIGHT...S winds 5 to 10 kt, becoming SW after midnight.
Waves 1 foot or less. A chance of showers. 
.FRI AND FRI NIGHT...N winds around 10 kt with gusts up to 20 kt.
Waves around 2 ft. 
.SAT AND SAT NIGHT...NE winds 5 to 10 kt, becoming S. Waves
1 foot or less. 
.SUN AND SUN NIGHT...SE winds 5 to 10 kt, becoming E. 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.

$$


	
X

ANZ231 Cape Cod Bay

		
Expires:202609170600;;553537
FZUS51 KBOX 161705
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
104 PM EDT Wed Sep 16 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ231-170600-
Cape Cod Bay-
104 PM EDT Wed Sep 16 2026

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

$$


	        
X

ANZ232 Nantucket Sound

Expires:202609170600;;553541
FZUS51 KBOX 161705
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
104 PM EDT Wed Sep 16 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ232-170600-
Nantucket Sound-
104 PM EDT Wed Sep 16 2026

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

$$


	                	
X

ANZ233 Vinyard Sound

Expires:202609170600;;553542
FZUS51 KBOX 161705
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
104 PM EDT Wed Sep 16 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ233-170600-
Vineyard Sound-
104 PM EDT Wed Sep 16 2026

.THIS AFTERNOON...SW winds around 10 kt. Seas around 2 ft. Wave
Detail: SW 1 foot at 3 seconds and NW 1 foot at 4 seconds. 
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft in the evening,
then 1 foot or less. Wave Detail: W 1 foot at 3 seconds and E
1 foot at 5 seconds. 
.THU...SW winds 5 to 10 kt. Seas 1 foot or less, then around 2 ft
in the afternoon. Wave Detail: SW 1 foot at 3 seconds and E
1 foot at 8 seconds, becoming W 1 foot at 3 seconds and NE 1 foot
at 8 seconds. 
.THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and E 1 foot at
7 seconds. A chance of showers after midnight. 
.FRI...W winds 10 to 15 kt with gusts up to 20 kt, becoming NW in
the afternoon. Seas 2 to 3 ft. Wave Detail: W 3 ft at 4 seconds
and E 1 foot at 7 seconds. A chance of showers in the morning. 
.FRI NIGHT...N winds 10 to 15 kt with gusts up to 20 kt. Seas
around 2 ft. Wave Detail: N 2 ft at 3 seconds and SW 2 ft at
5 seconds. 
.SAT AND SAT NIGHT...NE winds 10 to 15 kt, becoming SE 5 to
10 kt. Seas around 2 ft, then 1 foot or less. 
.SUN AND SUN NIGHT...SE 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.

$$


		                	
X

ANZ234 Buzzards Bay

Expires:202609170600;;553543
FZUS51 KBOX 161705
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
104 PM EDT Wed Sep 16 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ234-170600-
Buzzards Bay-
104 PM EDT Wed Sep 16 2026

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

$$


		              	
X

ANZ235 Rhode Island Sound

Expires:202609170600;;553544
FZUS51 KBOX 161705
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
104 PM EDT Wed Sep 16 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ235-170600-
Rhode Island Sound-
104 PM EDT Wed Sep 16 2026

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

$$


		
X

ANZ236 Narragansett Bay

Expires:202609170600;;553547
FZUS51 KBOX 161705
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
104 PM EDT Wed Sep 16 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ236-170600-
Narragansett Bay-
104 PM EDT Wed Sep 16 2026

.THIS AFTERNOON...SW winds around 10 kt. Waves around 2 ft. 
.TONIGHT...SW winds 5 to 10 kt. Waves around 2 ft in the evening,
then 1 foot or less. 
.THU...SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Waves 1 foot or less, then around 2 ft in the afternoon. 
.THU NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Waves around 2 ft. A chance of showers after midnight. 
.FRI...W winds around 10 kt, becoming N in the afternoon. Waves
around 2 ft. A chance of showers in the morning. 
.FRI NIGHT...N winds 10 to 15 kt. Waves around 2 ft. 
.SAT AND SAT NIGHT...NE winds 5 to 10 kt, becoming SE. Waves
around 2 ft, then 1 foot or less. 
.SUN AND SUN NIGHT...SE winds 10 to 15 kt, becoming E. Gusts up
to 20 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.

$$


			
X

ANZ237 Block Island Sound

Expires:202609170600;;553545
FZUS51 KBOX 161705
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
104 PM EDT Wed Sep 16 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ237-170600-
Block Island Sound-
104 PM EDT Wed Sep 16 2026

.THIS AFTERNOON...SW winds around 10 kt. Seas around 2 ft. Wave
Detail: SW 1 foot at 3 seconds and E 1 foot at 5 seconds. 
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW
1 foot at 3 seconds and E 1 foot at 5 seconds. 
.THU...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: W
1 foot at 2 seconds and SW 1 foot at 4 seconds. 
.THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and E 1 foot at
8 seconds. 
.FRI...W winds 10 to 15 kt, becoming NW 5 to 10 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and
N 1 foot at 5 seconds. 
.FRI NIGHT...N 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 NW 1 foot at
3 seconds. 
.SAT AND SAT NIGHT...E winds 10 to 15 kt with gusts up to 20 kt,
becoming SE 5 to 10 kt. Seas 2 to 3 ft. 
.SUN AND SUN NIGHT...SE 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.

$$


			
X

ANZ250 Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary

Expires:202609170600;;553535
FZUS51 KBOX 161705
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
104 PM EDT Wed Sep 16 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ250-170600-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
104 PM EDT Wed Sep 16 2026

.THIS AFTERNOON...S winds around 10 kt. Seas around 2 ft. Wave
Detail: SW 2 ft at 3 seconds and E 1 foot at 5 seconds. 
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S
2 ft at 3 seconds and E 2 ft at 7 seconds. 
.THU...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft
at 7 seconds and SW 1 foot at 3 seconds. 
.THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: E 2 ft at 4 seconds and SW 2 ft at
4 seconds. A chance of showers. 
.FRI...W winds around 10 kt with gusts up to 20 kt, becoming NW
in the afternoon. Seas 2 to 3 ft. Wave Detail: W 2 ft at
3 seconds and SW 2 ft at 4 seconds. A chance of showers in the
morning. 
.FRI NIGHT...N winds 10 to 15 kt, increasing to 15 to 20 kt after
midnight. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: N 4 ft
at 5 seconds and SW 1 foot at 3 seconds. 
.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...S winds 5 to 10 kt, becoming E. 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.

$$


	
X

ANZ251 Massachusetts Bay and Ipswich Bay

Expires:202609170600;;553536
FZUS51 KBOX 161705
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
104 PM EDT Wed Sep 16 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ251-170600-
Massachusetts Bay and Ipswich Bay-
104 PM EDT Wed Sep 16 2026

.THIS AFTERNOON...S winds around 10 kt. Seas around 2 ft. Wave
Detail: SW 1 foot at 3 seconds and E 1 foot at 5 seconds. 
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: W
2 ft at 3 seconds and E 2 ft at 9 seconds. 
.THU...N winds around 5 kt, becoming SE in the afternoon. Seas
around 2 ft. Wave Detail: E 2 ft at 8 seconds and S 1 foot at
3 seconds. 
.THU NIGHT...S winds 5 to 10 kt, becoming SW 10 to 15 kt with
gusts up to 20 kt after midnight. Seas around 2 ft. Wave Detail:
E 2 ft at 4 seconds and E 2 ft at 7 seconds. A chance of showers.
.FRI...NW winds 5 to 10 kt with gusts up to 20 kt. Seas around
2 ft. Wave Detail: E 2 ft at 7 seconds and W 1 foot at 2 seconds.
A chance of showers in the morning. 
.FRI NIGHT...N winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: N 3 ft at 4 seconds and SW 2 ft at
7 seconds. 
.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 3 ft. 
.SUN AND SUN NIGHT...S winds 5 to 10 kt, becoming E 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.

$$


		
X

ANZ254 Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 NM

 
Expires:202609170600;;553538
FZUS51 KBOX 161705
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
104 PM EDT Wed Sep 16 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ254-170600-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 NM-
104 PM EDT Wed Sep 16 2026

.THIS AFTERNOON...S winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: NE 2 ft at 7 seconds and SE 2 ft at 9 seconds. 
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
2 ft at 8 seconds and SW 1 foot at 3 seconds. 
.THU...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft
at 8 seconds and SW 1 foot at 4 seconds. 
.THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: S 2 ft at 3 seconds and E 2 ft at
7 seconds. A chance of showers after midnight. 
.FRI...W winds 10 to 15 kt, becoming NW in the afternoon. Gusts
up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds
and E 2 ft at 7 seconds. A chance of showers in the morning. 
.FRI NIGHT...N winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 4 ft. Wave Detail: NE 4 ft at 6 seconds and NW 2 ft at
3 seconds. 
.SAT AND SAT NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt,
becoming SE around 5 kt. Seas 2 to 4 ft. 
.SUN AND SUN NIGHT...SE winds 5 to 10 kt, increasing to 10 to
15 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.

$$


		
X

ANZ255 Coastal waters extending out to 25 NM south of Martha’s Vineyard and Nantucket

Expires:202609170600;;553539
FZUS51 KBOX 161705
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
104 PM EDT Wed Sep 16 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ255-170600-
Coastal Waters extending out to 25 NM South of Marthas Vineyard
and Nantucket-
104 PM EDT Wed Sep 16 2026

.THIS AFTERNOON...SW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: E 2 ft at 6 seconds and NW 1 foot at 5 seconds. 
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
2 ft at 6 seconds and E 2 ft at 9 seconds. 
.THU...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft
at 8 seconds and W 1 foot at 3 seconds. 
.THU NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and E
2 ft at 7 seconds. A chance of showers after midnight. 
.FRI...W winds around 15 kt, becoming NW in the afternoon. Gusts
up to 20 kt. Seas 2 to 4 ft. Wave Detail: W 3 ft at 4 seconds and
SW 3 ft at 5 seconds. A chance of showers in the morning. 
.FRI NIGHT...N winds 10 to 15 kt, becoming NE 15 to 20 kt after
midnight. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: N 3 ft
at 4 seconds and W 2 ft at 5 seconds. 
.SAT AND SAT NIGHT...NE winds 15 to 20 kt, becoming E 5 to 10 kt.
Seas 2 to 3 ft. 
.SUN AND SUN NIGHT...SE winds 10 to 15 kt. 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.

$$


		
X

ANZ256 Coastal waters from Montauk NY to Martha’s Vineyard extending out to 20 NM south of Block Island

Expires:202609170600;;553540
FZUS51 KBOX 161705
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
104 PM EDT Wed Sep 16 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ256-170600-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 NM South of Block Island-
104 PM EDT Wed Sep 16 2026

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

$$


		
X

ANZ270 Ocean waters from Merrimack River to Plymouth from 40 to 60 NM offshore

			
X

ANZ271 Ocean waters from Provincetown to Nantucket from 20 to 35 NM offshore

		
X

ANZ272 Ocean waters from Martha’s Vineyard to Nantucket from 25 to 40 NM offshore

		
X

ANZ273 Ocean waters from Montauk NY to Martha’s Vineyard from 25 to 40 NM offshore

 
		
X

ANZ230 Boston Harbor

 
Expires:202609170600;;553546
FZUS51 KBOX 161705
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
104 PM EDT Wed Sep 16 2026

Coastal waters from the Merrimack River MA to Watch Hill RI out
to 60 NM


ANZ230-170600-
Boston Harbor-
104 PM EDT Wed Sep 16 2026

.THIS AFTERNOON...S winds 5 to 10 kt. Waves 1 foot or less. 
.TONIGHT...SW winds 5 to 10 kt, diminishing to around 5 kt after
midnight. Waves 1 foot or less. 
.THU...N winds around 5 kt, becoming E in the afternoon. Waves
1 foot or less. 
.THU NIGHT...S winds 5 to 10 kt, becoming SW after midnight.
Waves 1 foot or less. A chance of showers. 
.FRI AND FRI NIGHT...N winds around 10 kt with gusts up to 20 kt.
Waves around 2 ft. 
.SAT AND SAT NIGHT...NE winds 5 to 10 kt, becoming S. Waves
1 foot or less. 
.SUN AND SUN NIGHT...SE winds 5 to 10 kt, becoming E. 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.

$$


		


  • Click on a zone to display the forecast for that area.
ANZ230 Boston Harbor ANZ231 Cape Cod Bay ANZ232 Nantucket Sound ANZ233 Vinyard Sound ANZ234 Buzzards Bay ANZ235 Rhode Island Sound ANZ236 Narragansett Bay ANZ237 Block Island Sound ANZ250 Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary ANZ251 Massachusetts Bay and Ipswich Bay ANZ254 Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 NM ANZ255 Coastal waters extending out to 25 NM south of Martha’s Vineyard and Nantucket ANZ256 Coastal waters from Montauk NY to Martha’s Vineyard extending out to 20 NM south of Block Island ANZ270 Ocean waters from Merrimack River to Plymouth from 40 to 60 NM offshore ANZ271 Ocean waters from Provincetown to Nantucket from 20 to 35 NM offshore ANZ272 Ocean waters from Martha’s Vineyard to Nantucket from 25 to 40 NM offshore ANZ273 Ocean waters from Montauk NY to Martha’s Vineyard from 25 to 40 NM offshore ANZ230 Boston Harbor ANZ231 Cape Cod Bay ANZ232 Nantucket Sound ANZ233 Vinyard Sound ANZ234 Buzzards Bay ANZ235 Rhode Island Sound ANZ236 Narragansett Bay ANZ237 Block Island Sound ANZ250 Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary ANZ251 Massachusetts Bay and Ipswich Bay ANZ254 Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 NM ANZ255 Coastal waters extending out to 25 NM south of Martha’s Vineyard and Nantucket ANZ256 Coastal waters from Montauk NY to Martha’s Vineyard extending out to 20 NM south of Block Island ANZ270 Ocean waters from Merrimack River to Plymouth from 40 to 60 NM offshore ANZ271 Ocean waters from Provincetown to Nantucket from 20 to 35 NM offshore ANZ272 Ocean waters from Martha’s Vineyard to Nantucket from 25 to 40 NM offshore ANZ273 Ocean waters from Montauk NY to Martha’s Vineyard from 25 to 40 NM offshore

 

 



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