441
FZUS51 KBOX 021404
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1004 AM EDT Tue Sep 2 2025

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

ANZ200-030300-
1004 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 to around 4 feet on
the outer waters. Next chance for precipitation comes Friday.

$$

ANZ250-030300-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
1004 AM EDT Tue Sep 2 2025

.THIS AFTERNOON...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.
.TONIGHT...SE winds around 5 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 8 seconds.
.WED...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 8 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
3 ft at 8 seconds and S 1 foot 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: E 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 2 to 4 ft. Wave Detail: S 3 ft at 4 seconds and E 2 ft at
8 seconds.
.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.

$$

ANZ251-030300-
Massachusetts Bay and Ipswich Bay-
1004 AM EDT Tue Sep 2 2025

.THIS AFTERNOON...E winds 5 to 10 kt. Seas 1 foot or less, then
around 2 ft. 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. Vsby 1 to 3 NM.
.TONIGHT...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 8 seconds and SE 1 foot at 2 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 S 1 foot 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: 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 25 kt.
Seas 2 to 3 ft. Wave Detail: SE 3 ft at 6 seconds and SW 1 foot
at 3 seconds.
.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.

$$

ANZ231-030300-
Cape Cod Bay-
1004 AM EDT Tue Sep 2 2025

.THIS AFTERNOON...NE winds 5 to 10 kt. Seas 1 foot or less, then
around 2 ft. Wave Detail: NE 1 foot at 3 seconds and E 1 foot at
7 seconds, becoming E 2 ft at 8 seconds and E 1 foot at
2 seconds.
.TONIGHT...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.
.FRI AND FRI NIGHT...S winds 10 to 15 kt with gusts up to 25 kt.
Seas 2 to 4 ft. Wave Detail: SW 2 ft at 3 seconds and S 2 ft at
6 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.

$$

ANZ254-030300-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
1004 AM EDT Tue Sep 2 2025

.THIS AFTERNOON...E winds 5 to 10 kt. Seas 2 to 4 ft. Wave
Detail: SE 3 ft at 8 seconds and N 1 foot at 3 seconds.
.TONIGHT...E winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE
3 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 3 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 1 foot at 2 seconds.
.FRI AND FRI NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: S 2 ft at 3 seconds and S 2 ft at
7 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.

$$

ANZ255-030300-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
1004 AM EDT Tue Sep 2 2025

.THIS AFTERNOON...NE winds around 10 kt. Seas 2 to 4 ft. Wave
Detail: E 3 ft at 8 seconds and NE 1 foot at 3 seconds.
.TONIGHT...E winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: E
3 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: SE 3 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: SE
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. Wave Detail: S 4 ft at 7 seconds and S 3 ft at
4 seconds.
.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.

$$

ANZ256-030300-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
1004 AM EDT Tue Sep 2 2025

.THIS AFTERNOON...E winds 10 to 15 kt. Seas 3 to 4 ft. Wave
Detail: E 3 ft at 8 seconds.
.TONIGHT...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: SE 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: SE
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 4 seconds.
.FRI AND FRI NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 3 to 5 ft. Wave Detail: S 4 ft at 7 seconds and S 2 ft at
4 seconds.
.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.

$$

ANZ232-030300-
Nantucket Sound-
1004 AM EDT Tue Sep 2 2025

.THIS AFTERNOON...E winds around 10 kt. Seas around 2 ft. Wave
Detail: E 2 ft at 8 seconds and E 1 foot at 3 seconds.
.TONIGHT...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
2 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 2 seconds.
.THU AND THU NIGHT...S winds 10 to 15 kt. Seas around 2 ft. Wave
Detail: S 2 ft at 3 seconds and S 1 foot at 7 seconds.
.FRI AND FRI NIGHT...S 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 S 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.

$$

ANZ233-030300-
Vineyard Sound-
1004 AM EDT Tue Sep 2 2025

.THIS AFTERNOON...E winds around 10 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 8 seconds and NE 1 foot at 2 seconds.
.TONIGHT...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. 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...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.
.THU AND THU NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SW 1 foot at 3 seconds and SE 1 foot at 7 seconds.
.FRI AND FRI NIGHT...S winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 4 ft. Wave Detail: S 3 ft at 7 seconds and S 2 ft at
4 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.

$$

ANZ234-030300-
Buzzards Bay-
1004 AM EDT Tue Sep 2 2025

.THIS AFTERNOON...E winds around 10 kt. Seas 1 foot or less, then
around 2 ft. Wave Detail: NE 1 foot at 2 seconds and SE 1 foot at
8 seconds, becoming SE 2 ft at 8 seconds and E 1 foot at
2 seconds.
.TONIGHT...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...SW winds 5 to 10 kt. Seas 1 foot or less. Wave
Detail: S 1 foot at 2 seconds and SE 1 foot at 7 seconds.
.THU AND THU NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: S 1 foot at 2 seconds and S 1 foot at 7 seconds.
.FRI AND FRI NIGHT...S winds 10 to 15 kt with gusts up to 25 kt.
Seas 2 to 4 ft. Wave Detail: S 2 ft at 3 seconds and S 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.

$$

ANZ235-030300-
Rhode Island Sound-
1004 AM EDT Tue Sep 2 2025

.THIS AFTERNOON...E winds around 10 kt. Seas 2 to 3 ft. Wave
Detail: SE 3 ft at 8 seconds and NE 1 foot at 2 seconds.
.TONIGHT...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. 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.
.THU AND THU NIGHT...S winds 10 to 15 kt. Seas around 2 ft. Wave
Detail: S 2 ft at 4 seconds and SE 2 ft at 7 seconds.
.FRI...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. Wave Detail: S 3 ft at 4 seconds and S 3 ft at 7 seconds.
.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.

$$

ANZ237-030300-
Block Island Sound-
1004 AM EDT Tue Sep 2 2025

.THIS AFTERNOON...E winds around 10 kt. Seas 2 to 3 ft. Wave
Detail: SE 3 ft at 7 seconds and NE 1 foot at 3 seconds.
.TONIGHT...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. 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.
.THU AND THU NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: S 2 ft at 3 seconds and SE 2 ft at 7 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 SE 2 ft at 8 seconds.
.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.

$$

ANZ230-030300-
Boston Harbor-
1004 AM EDT Tue Sep 2 2025

.THIS AFTERNOON...E winds 5 to 10 kt. Waves 1 foot or less.
.TONIGHT...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.

$$

ANZ236-030300-
Narragansett Bay-
1004 AM EDT Tue Sep 2 2025

.THIS AFTERNOON...NE winds 5 to 10 kt, becoming E. Waves around
2 ft.
.TONIGHT...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.

$$

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