416
FZUS51 KBOX 151405
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
1004 AM EDT Tue Jul 15 2025

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

ANZ200-160300-
1004 AM EDT Tue Jul 15 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
A weakening cold front should dissipate over southern New England
today. Bermuda high pressure will build into the region over the
next few days before a cold front crosses the waters Fri.

$$

ANZ250-160300-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
1004 AM EDT Tue Jul 15 2025

.THIS AFTERNOON...S winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 8 seconds and SW 1 foot at 3 seconds.
.TONIGHT...SW winds 5 to 10 kt. Gusts up to 20 kt in the evening.
Seas around 2 ft. Wave Detail: S 2 ft at 3 seconds and SE 2 ft at
7 seconds. Patchy fog after midnight with vsby 1 NM or less.
.WED...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: S 2 ft
at 3 seconds and SE 2 ft at 7 seconds. Patchy fog. Vsby 1 NM or
less.
.WED NIGHT...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 SE 1 foot at
7 seconds.
.THU...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at
9 seconds. A chance of showers.
.THU NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Seas
2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and E 1 foot at
10 seconds.
.FRI THROUGH SAT NIGHT...S 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.

$$

ANZ251-160300-
Massachusetts Bay and Ipswich Bay-
1004 AM EDT Tue Jul 15 2025

.THIS AFTERNOON...S winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 7 seconds and S 1 foot at 2 seconds.
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S
1 foot at 3 seconds and SE 1 foot at 7 seconds. Patchy fog after
midnight with vsby 1 NM or less.
.WED...SW winds 5 to 10 kt, becoming S 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 7 seconds, becoming S 2 ft at 3 seconds and SE 1 foot
at 7 seconds. Patchy fog in the morning with vsby 1 NM or less.
.WED NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds and E
1 foot at 7 seconds.
.THU...S 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 1 foot at 7 seconds.
A chance of showers. A chance of tstms in the afternoon.
.THU 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 3 seconds and E
1 foot at 10 seconds.
.FRI THROUGH SAT NIGHT...S winds 5 to 10 kt. Seas around 2 ft.

Winds and seas higher in and near tstms.

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.

$$

ANZ231-160300-
Cape Cod Bay-
1004 AM EDT Tue Jul 15 2025

.THIS AFTERNOON...S winds 5 to 10 kt. Seas 1 foot or less, then
around 2 ft. Wave Detail: SW 1 foot at 2 seconds and E 1 foot at
7 seconds, becoming SW 1 foot at 2 seconds and SE 1 foot at
7 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 2 seconds and SE
1 foot at 7 seconds. Patchy fog after midnight with vsby 1 NM or
less.
.WED...SW winds 5 to 10 kt, becoming S 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 2 seconds and SE
1 foot at 7 seconds, becoming S 1 foot at 3 seconds and SE 1 foot
at 7 seconds. Patchy fog in the morning with 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 1 foot at 3 seconds
and E 1 foot at 7 seconds.
.THU AND THU NIGHT...SW 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 E 1 foot at
8 seconds.
.FRI THROUGH SAT NIGHT...S winds 5 to 10 kt. Seas around 2 ft.
Wave Detail: W 1 foot at 3 seconds and E 1 foot at 9 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.

$$

ANZ254-160300-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
1004 AM EDT Tue Jul 15 2025

.THIS AFTERNOON...SW winds around 10 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 7 seconds and SW 1 foot at 3 seconds. Patchy
fog. A slight chance of showers and tstms. Vsby 1 NM or less.
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 7 seconds and S 1 foot at 3 seconds. Patchy fog. Vsby
1 NM or less, increasing to 1 to 3 NM after midnight.
.WED...SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot
at 7 seconds. Patchy fog in the morning with vsby 1 NM or less.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: SE 3 ft at 6 seconds.
.THU AND THU NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt.
Seas 2 to 4 ft. Wave Detail: S 4 ft at 6 seconds and E 1 foot at
9 seconds.
.FRI THROUGH SAT NIGHT...S winds 10 to 15 kt with gusts up to
20 kt. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 7 seconds and NE
2 ft at 10 seconds.

Winds and seas higher in and near tstms.

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.

$$

ANZ255-160300-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
1004 AM EDT Tue Jul 15 2025

.THIS AFTERNOON...SW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 6 seconds and SW 1 foot at 4 seconds. Patchy
fog. A slight chance of showers and tstms. Vsby 1 NM or less.
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW
2 ft at 4 seconds and SE 1 foot at 7 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 2 to 3 ft. Wave Detail: SW 2 ft at 5 seconds and
E 1 foot at 7 seconds. Patchy fog in the morning with vsby 1 NM
or less.
.WED 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 5 seconds and E
1 foot at 7 seconds. Patchy fog in the evening. A chance of
showers after midnight. Vsby 1 to 3 NM in the evening.
.THU AND THU NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt.
Seas 3 to 5 ft. Wave Detail: SW 5 ft at 7 seconds and E 1 foot at
8 seconds.
.FRI AND FRI NIGHT...W winds 10 to 15 kt with gusts up to 20 kt,
becoming N. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 7 seconds and
E 1 foot at 10 seconds.
.SAT AND SAT NIGHT...NE winds 10 to 15 kt, becoming SE 5 to
10 kt. Seas 2 to 4 ft.

Winds and seas higher in and near tstms.

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.

$$

ANZ256-160300-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
1004 AM EDT Tue Jul 15 2025

.THIS AFTERNOON...SW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: SE 2 ft at 6 seconds and SW 1 foot at 4 seconds. Patchy
fog. A slight chance of showers and tstms. Vsby 1 NM or less.
.TONIGHT...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. Patchy fog. Vsby 1 NM
or less.
.WED...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SW
2 ft at 5 seconds and E 1 foot at 7 seconds. Patchy fog in the
morning with vsby 1 NM or less.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: S 3 ft at 5 seconds and SE 1 foot at
8 seconds. Patchy fog in the evening. A chance of showers after
midnight. Vsby 1 to 3 NM in the evening.
.THU...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to
4 ft. Wave Detail: S 4 ft at 6 seconds and E 1 foot at 6 seconds.
A chance of showers in the morning.
.THU NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas
4 to 5 ft. Wave Detail: SW 5 ft at 7 seconds.
.FRI THROUGH SAT...NE winds 10 to 15 kt with gusts up to 20 kt.
Seas 3 to 5 ft.
.SAT NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft.

Winds and seas higher in and near tstms.

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.

$$

ANZ232-160300-
Nantucket Sound-
1004 AM EDT Tue Jul 15 2025

.THIS AFTERNOON...SW winds around 10 kt. Seas around 2 ft. Wave
Detail: SW 1 foot at 3 seconds and E 1 foot at 6 seconds. Patchy
fog. A slight chance of showers and tstms. Vsby 1 to 3 NM,
decreasing to 1 NM or less.
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW
1 foot at 3 seconds and E 1 foot at 6 seconds. Patchy fog. Vsby
1 to 3 NM, decreasing to 1 NM or less after midnight.
.WED...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: SW
2 ft at 3 seconds and E 1 foot at 6 seconds. Patchy fog in the
morning with vsby 1 NM or less.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
around 2 ft. Wave Detail: SW 2 ft at 3 seconds and E 1 foot at
6 seconds.
.THU AND THU NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt.
Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot
at 7 seconds.
.FRI THROUGH SAT NIGHT...S winds 10 to 15 kt with gusts up to
20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 5 seconds and NE
2 ft at 3 seconds.

Winds and seas higher in and near tstms.

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.

$$

ANZ233-160300-
Vineyard Sound-
1004 AM EDT Tue Jul 15 2025

.THIS AFTERNOON...SW winds around 10 kt. Seas around 2 ft. Wave
Detail: SW 1 foot at 3 seconds and SE 1 foot at 7 seconds. Patchy
fog. A slight chance of showers and tstms. Vsby 1 NM or less,
increasing to 1 to 3 NM.
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW
1 foot at 3 seconds and SE 1 foot at 7 seconds. Patchy fog. Vsby
1 to 3 NM, decreasing to 1 NM or less after midnight.
.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 5 seconds
and SE 1 foot at 8 seconds. Patchy fog in the morning with vsby
1 NM or less.
.WED NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and
SE 1 foot at 8 seconds. Patchy fog in the evening. A chance of
showers after midnight. Vsby 1 to 3 NM in the evening.
.THU...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: SW 3 ft at 5 seconds and E 1 foot at
7 seconds. A chance of showers in the morning.
.THU NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 4 ft. Wave Detail: SW 4 ft at 5 seconds.
.FRI THROUGH SAT NIGHT...S winds 10 to 15 kt with gusts up to
20 kt. Seas 2 to 3 ft.

Winds and seas higher in and near tstms.

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.

$$

ANZ234-160300-
Buzzards Bay-
1004 AM EDT Tue Jul 15 2025

.THIS AFTERNOON...SW winds around 10 kt. Seas 1 foot or less,
then around 2 ft. Wave Detail: SW 1 foot at 3 seconds and SE
1 foot at 7 seconds, becoming SW 1 foot at 3 seconds and SE
1 foot at 6 seconds. Patchy fog. Vsby 1 to 3 NM.
.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 SE
1 foot at 7 seconds. Patchy fog. Vsby 1 to 3 NM, decreasing to
1 NM or less after midnight.
.WED...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 4 seconds and SE
1 foot at 7 seconds, becoming SW 2 ft at 4 seconds and SE 1 foot
at 7 seconds. Patchy fog. Vsby 1 NM or less, increasing to 1 to
3 NM in the afternoon.
.WED 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 SE 1 foot at
7 seconds. Patchy fog in the evening. A chance of showers after
midnight. Vsby 1 to 3 NM in the evening.
.THU...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: SW 3 ft at 4 seconds and E 1 foot at
7 seconds. A chance of showers in the morning.
.THU NIGHT...SW winds 15 to 20 kt, diminishing to 10 to 15 kt
after midnight. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail:
SW 3 ft at 5 seconds and E 1 foot at 10 seconds.
.FRI THROUGH SAT NIGHT...S 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.

$$

ANZ235-160300-
Rhode Island Sound-
1004 AM EDT Tue Jul 15 2025

.THIS AFTERNOON...SW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: S 2 ft at 5 seconds. Patchy fog. A slight chance of
showers and tstms. Vsby 1 NM or less.
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW
2 ft at 4 seconds and SE 1 foot at 7 seconds. Patchy fog. Vsby
1 to 3 NM, decreasing to 1 NM or less after midnight.
.WED...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts
up to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: S
2 ft at 6 seconds. Patchy fog. Vsby 1 NM or less, increasing to
1 to 3 NM in the afternoon.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: S 3 ft at 5 seconds and SE 1 foot at
9 seconds. Patchy fog in the evening. A chance of showers after
midnight. Vsby 1 to 3 NM in the evening.
.THU...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to
4 ft. Wave Detail: SE 4 ft at 7 seconds. A chance of showers.
.THU NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 4 ft. Wave Detail: SW 4 ft at 6 seconds.
.FRI THROUGH SAT NIGHT...S winds 10 to 15 kt. Seas 2 to 4 ft.

Winds and seas higher in and near tstms.

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.

$$

ANZ237-160300-
Block Island Sound-
1004 AM EDT Tue Jul 15 2025

.THIS AFTERNOON...SW winds 5 to 10 kt. Seas around 2 ft. Wave
Detail: S 2 ft at 6 seconds. Patchy fog. A slight chance of
showers and tstms. Vsby 1 to 3 NM.
.TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S
2 ft at 5 seconds. Patchy fog. Vsby 1 NM or less.
.WED...SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon.
Seas around 2 ft. Wave Detail: S 2 ft at 6 seconds. Patchy fog in
the morning with vsby 1 NM or less.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
2 to 3 ft. Wave Detail: SW 3 ft at 5 seconds and SE 1 foot at
8 seconds. A chance of showers and tstms after midnight.
.THU...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to
3 ft. Wave Detail: SW 3 ft at 6 seconds and SE 1 foot at
8 seconds. A chance of showers.
.THU NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Seas
2 to 4 ft. Wave Detail: SW 4 ft at 6 seconds.
.FRI THROUGH SAT...E winds 5 to 10 kt. Seas 2 to 4 ft.
.SAT NIGHT...S winds 5 to 10 kt. Seas around 2 ft.

Winds and seas higher in and near tstms.

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.

$$

ANZ230-160300-
Boston Harbor-
1004 AM EDT Tue Jul 15 2025

.THIS AFTERNOON...S winds 5 to 10 kt. Waves 1 foot or less.
.TONIGHT...SW winds 5 to 10 kt. Waves 1 foot or less.
.WED...SW winds around 5 kt, becoming S 10 to 15 kt in the
afternoon. Waves 1 foot or less, then around 2 ft in the
afternoon. Patchy fog in the morning with vsby 1 to 3 NM.
.WED NIGHT...SW winds 10 to 15 kt. Waves around 2 ft in the
evening, then 1 foot or less.
.THU AND THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt.
Waves around 2 ft. A chance of showers. A chance of tstms through
the night.
.FRI...NW winds around 10 kt. Waves around 2 ft. A chance of
showers and tstms.
.FRI NIGHT THROUGH SAT NIGHT...S winds 5 to 10 kt. Waves 1 foot
or less.

Winds and waves higher in and near tstms.

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.

$$

ANZ236-160300-
Narragansett Bay-
1004 AM EDT Tue Jul 15 2025

.THIS AFTERNOON...S winds 5 to 10 kt. Waves 1 foot or less, then
around 2 ft.
.TONIGHT...SW winds 5 to 10 kt. Waves 1 foot or less. Patchy fog.
Vsby 1 to 3 NM, decreasing to 1 NM or less after midnight.
.WED...SW winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up
to 20 kt in the afternoon. Waves 1 foot or less, then around 2 ft
in the afternoon. Patchy fog in the morning with vsby 1 NM or
less.
.WED NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Waves around 2 ft. A chance of showers and tstms after
midnight.
.THU...SW winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to
3 ft. A chance of showers. A chance of tstms in the afternoon.
.THU NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the
evening. Waves 2 to 3 ft.
.FRI THROUGH SAT NIGHT...S winds 5 to 10 kt. Waves around 2 ft.

Winds and waves higher in and near tstms.

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