023
FZUS51 KBOX 101406
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1006 AM EDT Sun Aug 10 2025

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

ANZ200-110300-
1006 AM EDT Sun Aug 10 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
High Pressure is continuing to bring pleasant boating conditions
through midweek. Winds gradually increase form the SW Tue and Wed but
remain below small craft criteria.

$$

ANZ250-110300-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
1006 AM EDT Sun Aug 10 2025

.THIS AFTERNOON...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: SE 3 ft at 9 seconds and SW 1 foot at 2 seconds.
.TONIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the evening.
Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and SW 2 ft at
3 seconds.
.MON...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at
9 seconds and SW 1 foot at 3 seconds.
.MON NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 9 seconds and S
2 ft at 3 seconds.
.TUE AND TUE 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 3 ft at
9 seconds.
.WED THROUGH THU NIGHT...W 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 NW
2 ft at 3 seconds.

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.

$$

ANZ251-110300-
Massachusetts Bay and Ipswich Bay-
1006 AM EDT Sun Aug 10 2025

.THIS AFTERNOON...S winds 5 to 10 kt, becoming SE 10 to 15 kt.
Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and S 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: S 2 ft at 3 seconds and SE
2 ft at 9 seconds.
.MON...SW winds 5 to 10 kt, becoming S in the afternoon. Seas
2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and SW 1 foot at
3 seconds.
.MON NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail:
SE 3 ft at 9 seconds and S 2 ft at 4 seconds.
.TUE...SW winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up
to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: E 3 ft at
9 seconds and SW 2 ft at 3 seconds.
.TUE 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 E
2 ft at 8 seconds.
.WED THROUGH THU NIGHT...W 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.

$$

ANZ231-110300-
Cape Cod Bay-
1006 AM EDT Sun Aug 10 2025

.THIS AFTERNOON...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.
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
2 ft at 8 seconds and SW 1 foot at 2 seconds.
.MON...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft
at 8 seconds and SW 1 foot at 2 seconds.
.MON NIGHT...SW winds around 10 kt. Seas around 2 ft. Wave
Detail: E 2 ft at 9 seconds and SW 1 foot at 3 seconds.
.TUE AND TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt.
Seas around 2 ft. Wave Detail: E 2 ft at 9 seconds and SW 1 foot
at 3 seconds.
.WED THROUGH THU NIGHT...W winds 10 to 15 kt with gusts up to
25 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and E
2 ft at 8 seconds.

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.

$$

ANZ254-110300-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
1006 AM EDT Sun Aug 10 2025

.THIS AFTERNOON...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: E 3 ft at 8 seconds and SE 1 foot at 9 seconds.
.TONIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 8 seconds and SW 1 foot at 3 seconds. Patchy fog after
midnight with vsby 1 NM or less.
.MON...SW winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: E 4 ft
at 9 seconds and W 1 foot at 3 seconds. Patchy fog in the morning
with vsby 1 NM or less.
.MON NIGHT...SW winds around 10 kt. Seas 3 to 4 ft. Wave Detail:
E 4 ft at 9 seconds and SW 2 ft at 3 seconds.
.TUE AND TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt.
Seas 2 to 3 ft. Wave Detail: E 3 ft at 9 seconds and SW 2 ft at
3 seconds.
.WED THROUGH THU NIGHT...W 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 E
2 ft at 8 seconds.

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.

$$

ANZ255-110300-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
1006 AM EDT Sun Aug 10 2025

.THIS AFTERNOON...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: E 3 ft at 8 seconds and SE 2 ft at 10 seconds.
.TONIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E
3 ft at 8 seconds and SW 1 foot at 4 seconds. Patchy fog after
midnight with vsby 1 NM or less.
.MON...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 8 seconds and W 2 ft at 3 seconds. Patchy fog in the morning
with vsby 1 NM or less.
.MON NIGHT...SW winds around 10 kt. Seas 2 to 3 ft. Wave Detail:
E 3 ft at 9 seconds and SW 2 ft at 4 seconds.
.TUE AND TUE NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave
Detail: E 3 ft at 9 seconds and SW 2 ft at 4 seconds.
.WED THROUGH THU NIGHT...W 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
2 ft at 8 seconds.

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.

$$

ANZ256-110300-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
1006 AM EDT Sun Aug 10 2025

.THIS AFTERNOON...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave
Detail: SE 3 ft at 9 seconds.
.TONIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE
3 ft at 8 seconds and SW 1 foot at 4 seconds. Patchy fog after
midnight with vsby 1 NM or less.
.MON...SW winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and
SW 2 ft at 3 seconds. Patchy fog in the morning with vsby 1 NM or
less.
.MON NIGHT...SW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: E
3 ft at 9 seconds and SW 2 ft at 4 seconds.
.TUE AND TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt.
Seas around 3 ft. Wave Detail: E 3 ft at 9 seconds and SW 2 ft at
4 seconds.
.WED THROUGH THU NIGHT...W 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
2 ft at 8 seconds.

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.

$$

ANZ232-110300-
Nantucket Sound-
1006 AM EDT Sun Aug 10 2025

.THIS AFTERNOON...S winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: S 1 foot at 3 seconds and E 1 foot at 8 seconds.
.TONIGHT...SW winds around 10 kt. Seas around 2 ft. Wave Detail:
SW 1 foot at 3 seconds and E 1 foot at 8 seconds. Patchy fog
after midnight with vsby 1 NM or less.
.MON...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SW
2 ft at 3 seconds and E 2 ft at 8 seconds. Patchy fog in the
morning with vsby 1 NM or less.
.MON NIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
SW 2 ft at 3 seconds and E 2 ft at 9 seconds.
.TUE AND TUE 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 E 2 ft at
9 seconds.
.WED THROUGH THU NIGHT...W 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 E
1 foot at 8 seconds.

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.

$$

ANZ233-110300-
Vineyard Sound-
1006 AM EDT Sun Aug 10 2025

.THIS AFTERNOON...SW winds 5 to 10 kt. Seas 1 foot or less, then
around 2 ft. Wave Detail: S 1 foot at 3 seconds and SE 1 foot at
8 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.
.MON...SW winds around 10 kt. Seas around 2 ft. Wave Detail: SW
2 ft at 3 seconds and E 2 ft at 9 seconds.
.MON NIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail:
SW 2 ft at 4 seconds and E 2 ft at 9 seconds.
.TUE AND TUE 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 E 2 ft at
9 seconds.
.WED THROUGH THU NIGHT...W 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 E
1 foot at 8 seconds.

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.

$$

ANZ234-110300-
Buzzards Bay-
1006 AM EDT Sun Aug 10 2025

.THIS AFTERNOON...SW winds 5 to 10 kt. Seas 1 foot or less, then
around 2 ft. Wave Detail: S 1 foot at 2 seconds and SE 1 foot at
8 seconds, becoming SW 1 foot at 2 seconds and SE 1 foot at
9 seconds.
.TONIGHT...SW winds 5 to 10 kt. Seas 1 foot or less. Wave Detail:
SW 1 foot at 3 seconds and E 1 foot at 8 seconds.
.MON...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 E 2 ft at 9 seconds and SW 1 foot
at 3 seconds.
.MON 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
E 2 ft at 9 seconds.
.TUE AND TUE 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 E 2 ft at
9 seconds.
.WED THROUGH THU NIGHT...W winds 10 to 15 kt with gusts up to
25 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and E
1 foot at 8 seconds.

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.

$$

ANZ235-110300-
Rhode Island Sound-
1006 AM EDT Sun Aug 10 2025

.THIS AFTERNOON...SW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 8 seconds and S 1 foot at 4 seconds.
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 7 seconds and SE 2 ft at 8 seconds.
.MON...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 3 seconds
and SE 2 ft at 8 seconds.
.MON NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail:
SW 2 ft at 4 seconds and E 2 ft at 9 seconds.
.TUE AND TUE NIGHT...SW 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 E 2 ft at
9 seconds.
.WED THROUGH THU NIGHT...W 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 8 seconds.

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.

$$

ANZ237-110300-
Block Island Sound-
1006 AM EDT Sun Aug 10 2025

.THIS AFTERNOON...SW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 8 seconds and S 1 foot at 4 seconds.
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E
2 ft at 8 seconds and SE 2 ft at 8 seconds.
.MON...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 3 seconds
and E 2 ft at 7 seconds.
.MON NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail:
SW 2 ft at 3 seconds and E 2 ft at 9 seconds.
.TUE AND TUE 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 2 ft at
9 seconds.
.WED THROUGH THU NIGHT...W 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 E
2 ft at 8 seconds.

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.

$$

ANZ230-110300-
Boston Harbor-
1006 AM EDT Sun Aug 10 2025

.THIS AFTERNOON...SE winds 5 to 10 kt. Waves 1 foot or less, then
around 2 ft.
.TONIGHT...SW winds 5 to 10 kt. Waves around 2 ft in the evening,
then 1 foot or less.
.MON...SW winds around 5 kt, becoming SE in the afternoon. Waves
1 foot or less.
.MON NIGHT...SW winds 5 to 10 kt. Waves 1 foot or less.
.TUE...SW winds 5 to 10 kt, becoming S in the afternoon. Waves
1 foot or less, then around 2 ft in the afternoon.
.TUE NIGHT...S winds 10 to 15 kt, becoming SW 5 to 10 kt after
midnight. Waves around 2 ft in the evening, then 1 foot or less.
.WED THROUGH THU NIGHT...W 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.

$$

ANZ236-110300-
Narragansett Bay-
1006 AM EDT Sun Aug 10 2025

.THIS AFTERNOON...S winds 5 to 10 kt. Waves 1 foot or less.
.TONIGHT...SW winds 5 to 10 kt. Waves around 2 ft.
.MON...SW winds 5 to 10 kt, increasing to 10 to 15 kt in the
afternoon. Waves 1 foot or less, then around 2 ft in the
afternoon.
.MON NIGHT...SW winds 10 to 15 kt, diminishing to 5 to 10 kt
after midnight. Waves around 2 ft.
.TUE AND TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt.
Waves around 2 ft.
.WED THROUGH THU NIGHT...W winds 10 to 15 kt with gusts up to
20 kt. Waves 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.

$$

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