933
FZUS51 KBOX 060905
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
405 AM EST Sat Dec 6 2025

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

ANZ200-062200-
405 AM EST Sat Dec 6 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
High pres builds over the waters today, followed by a weak low pres
system passing well to our south Sat. Another strong cold front will
cross the waters late Sun into Sun night followed by high pres
building in from the west on Mon. Low pres will then approach from
the west on Tue.

$$

ANZ250-062200-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
405 AM EST Sat Dec 6 2025

.TODAY...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S
1 foot at 2 seconds and W 1 foot at 3 seconds. A slight chance of
rain.
.TONIGHT...W winds 10 to 15 kt, becoming NW after midnight. Gusts
up to 20 kt. Seas 2 to 3 ft. Wave Detail: W 3 ft at 4 seconds and
SE 2 ft at 9 seconds.
.SUN...NW winds 10 to 15 kt with gusts up to 20 kt, diminishing
to 5 to 10 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: NW
3 ft at 4 seconds and SE 3 ft at 9 seconds.
.SUN NIGHT...W winds 5 to 10 kt, increasing to 15 to 20 kt with
gusts up to 25 kt after midnight. Seas 2 to 4 ft. Wave Detail: NW
3 ft at 4 seconds and SE 3 ft at 9 seconds. A chance of rain and
snow after midnight.
.MON...NW winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to
6 ft. Wave Detail: N 6 ft at 6 seconds and SE 3 ft at 8 seconds.
A chance of snow in the morning.
.MON NIGHT...NW winds 15 to 20 kt, diminishing to 10 to 15 kt
after midnight. Gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: N
5 ft at 6 seconds and SE 1 foot at 8 seconds.
.TUE...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to
4 ft.
.TUE NIGHT AND WED...SW winds 15 to 20 kt with gusts up to 25 kt.
Seas 2 to 4 ft. A chance of rain.
.WED NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 5 ft. Rain likely.

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.

$$

ANZ251-062200-
Massachusetts Bay and Ipswich Bay-
405 AM EST Sat Dec 6 2025

.TODAY...SW winds 5 to 10 kt. Seas 1 foot or less, then around
2 ft this afternoon. Wave Detail: NW 1 foot at 3 seconds and SE
1 foot at 4 seconds, becoming W 1 foot at 2 seconds and SE 1 foot
at 3 seconds. A slight chance of rain. A slight chance of snow
this morning.
.TONIGHT...W winds 10 to 15 kt. Seas around 2 ft. Wave Detail: W
2 ft at 3 seconds and SE 1 foot at 3 seconds.
.SUN...NW winds 10 to 15 kt, diminishing to 5 to 10 kt in the
afternoon. Seas around 2 ft. Wave Detail: NW 2 ft at 3 seconds
and SE 2 ft at 9 seconds.
.SUN NIGHT...W winds 5 to 10 kt, becoming NW 15 to 20 kt with
gusts up to 25 kt after midnight. Seas 2 to 3 ft. Wave Detail: NW
3 ft at 4 seconds and E 3 ft at 9 seconds. A chance of snow after
midnight.
.MON AND MON NIGHT...NW winds 20 to 25 kt with gusts up to 30 kt.
Seas 2 to 4 ft. Wave Detail: N 4 ft at 5 seconds and E 2 ft at
8 seconds.
.TUE...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 NE 2 ft at 6 seconds.
.TUE NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 3 ft. A chance of snow.
.WED...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft. A chance of rain.
.WED NIGHT...SW winds 15 to 20 kt. Seas 2 to 3 ft. Rain likely.

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.

$$

ANZ231-062200-
Cape Cod Bay-
405 AM EST Sat Dec 6 2025

.TODAY...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: S
1 foot at 4 seconds and N 1 foot at 4 seconds. A slight chance of
rain.
.TONIGHT...W winds 5 to 10 kt, becoming NW 10 to 15 kt after
midnight. Seas around 2 ft. Wave Detail: W 1 foot at 3 seconds
and SE 1 foot at 5 seconds.
.SUN...NW winds 10 to 15 kt, diminishing to 5 to 10 kt in the
afternoon. Seas around 2 ft. Wave Detail: NW 2 ft at 4 seconds
and SE 2 ft at 9 seconds.
.SUN NIGHT...SW winds 5 to 10 kt, becoming W 15 to 20 kt with
gusts up to 25 kt after midnight. Seas 2 to 3 ft. Wave Detail: NW
2 ft at 4 seconds and SE 2 ft at 9 seconds.
.MON...NW winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to
5 ft. Wave Detail: N 5 ft at 6 seconds and E 2 ft at 8 seconds.
.MON NIGHT...N winds 15 to 20 kt, becoming NW 10 to 15 kt after
midnight. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: N 4 ft
at 6 seconds and E 1 foot at 8 seconds.
.TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to
3 ft.
.TUE NIGHT THROUGH WED NIGHT...SW winds 15 to 20 kt. Seas 2 to
3 ft. A chance of rain.

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.

$$

ANZ254-062200-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
405 AM EST Sat Dec 6 2025

.TODAY...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE
2 ft at 4 seconds and NW 1 foot at 5 seconds. A slight chance of
rain this afternoon.
.TONIGHT...SW winds 10 to 15 kt, becoming NW with gusts up to
20 kt after midnight. Seas 2 to 4 ft. Wave Detail: NW 2 ft at
4 seconds and SE 2 ft at 5 seconds.
.SUN...NW winds 10 to 15 kt with gusts up to 20 kt, diminishing
to 5 to 10 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: NW
3 ft at 4 seconds and SE 3 ft at 9 seconds.
.SUN NIGHT...SW winds 5 to 10 kt, becoming W 15 to 20 kt with
gusts up to 25 kt after midnight. Seas 3 to 4 ft. Wave Detail: NW
3 ft at 4 seconds and SE 3 ft at 8 seconds. A chance of snow
after midnight.
.MON...NW winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to
6 ft. Wave Detail: N 6 ft at 6 seconds and E 3 ft at 8 seconds. A
chance of snow and freezing rain in the morning.
.MON NIGHT...N winds 20 to 25 kt with gusts up to 30 kt,
diminishing to 15 to 20 kt after midnight. Seas 4 to 6 ft. Wave
Detail: N 6 ft at 7 seconds and E 1 foot at 8 seconds.
.TUE...W winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to
5 ft.
.TUE NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas
4 to 6 ft. A chance of rain.
.WED...SW winds around 15 kt with gusts up to 20 kt. Seas 3 to
5 ft. A chance of rain.
.WED NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas
4 to 6 ft. A chance of rain.

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.

$$

ANZ255-062200-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
405 AM EST Sat Dec 6 2025

.TODAY...E winds 5 to 10 kt, becoming SE this afternoon. Seas
around 2 ft. Wave Detail: SE 2 ft at 9 seconds and S 1 foot at
4 seconds.
.TONIGHT...W winds 10 to 15 kt, becoming NW with gusts up to
20 kt after midnight. Seas 2 to 4 ft. Wave Detail: W 3 ft at
4 seconds and SE 3 ft at 9 seconds.
.SUN...N winds 10 to 15 kt, becoming W 5 to 10 kt in the
afternoon. Seas 2 to 4 ft. Wave Detail: N 3 ft at 4 seconds and
SE 3 ft at 8 seconds.
.SUN NIGHT...SW winds 10 to 15 kt, becoming W 20 to 25 kt after
midnight. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 6 seconds and
SE 3 ft at 8 seconds.
.MON AND MON NIGHT...N winds 25 to 30 kt. Seas 4 to 6 ft. Wave
Detail: W 6 ft at 7 seconds and E 2 ft at 8 seconds.
.TUE...W winds 15 to 20 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft
at 4 seconds and N 2 ft at 5 seconds.
.TUE NIGHT AND WED...SW winds 25 to 30 kt, diminishing to 20 to
25 kt. Seas 5 to 7 ft. A chance of rain.
.WED NIGHT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas
6 to 9 ft. A chance of rain.

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.

$$

ANZ256-062200-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
405 AM EST Sat Dec 6 2025

.TODAY...SE winds 5 to 10 kt, becoming SW this afternoon. Seas
2 to 3 ft. Wave Detail: SE 2 ft at 4 seconds and SE 2 ft at
10 seconds. A slight chance of rain this morning.
.TONIGHT...NW winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas 2 to 4 ft. Wave Detail: NW 3 ft at 4 seconds and
SE 3 ft at 9 seconds.
.SUN...N winds 10 to 15 kt, becoming W 5 to 10 kt in the
afternoon. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 9 seconds and
NW 2 ft at 4 seconds.
.SUN NIGHT...W winds 10 to 15 kt, becoming NW 20 to 25 kt after
midnight. Seas 3 to 5 ft. Wave Detail: W 4 ft at 4 seconds and SW
3 ft at 7 seconds.
.MON AND MON NIGHT...N winds 20 to 25 kt with gusts up to 30 kt.
Seas 4 to 6 ft. Wave Detail: N 5 ft at 5 seconds and SW 3 ft at
6 seconds.
.TUE...SW winds 15 to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft
at 4 seconds and N 2 ft at 4 seconds.
.TUE NIGHT...SW winds 25 to 30 kt. Seas 5 to 7 ft.
.WED...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to
7 ft. A chance of rain.
.WED NIGHT...SW winds 25 to 30 kt. Seas 6 to 9 ft. A chance of
rain.

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.

$$

ANZ232-062200-
Nantucket Sound-
405 AM EST Sat Dec 6 2025

.TODAY...E winds 5 to 10 kt, becoming S this afternoon. Seas
1 foot or less, then around 2 ft this afternoon. Wave Detail: S
1 foot at 3 seconds and E 1 foot at 4 seconds, becoming SE 1 foot
at 3 seconds and NW 1 foot at 4 seconds.
.TONIGHT...W winds 10 to 15 kt, becoming NW after midnight. Seas
around 2 ft. Wave Detail: NW 2 ft at 3 seconds and SE 1 foot at
5 seconds.
.SUN...NW winds 10 to 15 kt, becoming W 5 to 10 kt in the
afternoon. Seas around 2 ft. Wave Detail: NW 2 ft at 3 seconds
and E 1 foot at 5 seconds.
.SUN NIGHT...SW winds 5 to 10 kt, becoming W 15 to 20 kt with
gusts up to 25 kt after midnight. Seas 2 to 3 ft. Wave Detail: W
3 ft at 4 seconds and N 1 foot at 4 seconds.
.MON AND MON NIGHT...N winds 20 to 25 kt with gusts up to 30 kt.
Seas 2 to 4 ft. Wave Detail: N 4 ft at 5 seconds and SW 1 foot at
6 seconds.
.TUE...W winds 15 to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft
at 4 seconds and NE 2 ft at 5 seconds.
.TUE NIGHT...SW winds 20 to 25 kt. Seas 3 to 5 ft. A chance of
rain.
.WED...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to
4 ft. A chance of rain.
.WED NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 5 ft. A chance of rain.

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.

$$

ANZ233-062200-
Vineyard Sound-
405 AM EST Sat Dec 6 2025

.TODAY...SE winds 5 to 10 kt, becoming S this afternoon. Seas
1 foot or less, then around 2 ft this afternoon. Wave Detail: SE
1 foot at 4 seconds and SE 1 foot at 10 seconds, becoming S
1 foot at 3 seconds and SE 1 foot at 10 seconds.
.TONIGHT...NW winds around 10 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 8 seconds and SW 1 foot at 3 seconds.
.SUN...NW winds 5 to 10 kt, becoming W in the afternoon. Seas
around 2 ft. Wave Detail: SE 2 ft at 8 seconds and NW 1 foot at
3 seconds.
.SUN NIGHT...SW winds 10 to 15 kt, becoming NW 15 to 20 kt with
gusts up to 25 kt after midnight. Seas 2 to 3 ft. Wave Detail: W
2 ft at 4 seconds and SW 2 ft at 7 seconds.
.MON AND MON NIGHT...N winds 20 to 25 kt. Seas 2 to 3 ft. Wave
Detail: N 3 ft at 5 seconds and SW 2 ft at 6 seconds.
.TUE...W winds 15 to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft
at 4 seconds and N 1 foot at 4 seconds.
.TUE NIGHT...SW winds 20 to 25 kt. Seas 4 to 6 ft. A chance of
rain.
.WED...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to
5 ft. A chance of rain.
.WED NIGHT...SW winds 20 to 25 kt. Seas 4 to 6 ft. A chance of
rain.

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.

$$

ANZ234-062200-
Buzzards Bay-
405 AM EST Sat Dec 6 2025

.TODAY...SE winds 5 to 10 kt, becoming S this afternoon. Seas
1 foot or less. Wave Detail: NW 1 foot at 2 seconds and SE 1 foot
at 4 seconds. A slight chance of rain this morning.
.TONIGHT...NW winds around 10 kt. Seas around 2 ft. Wave Detail:
SE 2 ft at 9 seconds and W 1 foot at 3 seconds.
.SUN...NW winds 5 to 10 kt, becoming W in the afternoon. Seas
around 2 ft. Wave Detail: NW 1 foot at 3 seconds and E 1 foot at
4 seconds.
.SUN NIGHT...SW winds 5 to 10 kt, becoming NW 15 to 20 kt with
gusts up to 25 kt after midnight. Seas 2 to 3 ft. Wave Detail: W
2 ft at 3 seconds and S 2 ft at 7 seconds.
.MON AND MON NIGHT...N winds 20 to 25 kt. Seas 2 to 3 ft. Wave
Detail: N 2 ft at 4 seconds and SW 2 ft at 6 seconds.
.TUE...SW winds 15 to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft
at 4 seconds and N 1 foot at 3 seconds.
.TUE NIGHT AND WED...SW winds 20 to 25 kt, diminishing to 15 to
20 kt. Seas 2 to 4 ft. A chance of rain.
.WED NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas
3 to 5 ft. A chance of rain.

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.

$$

ANZ235-062200-
Rhode Island Sound-
405 AM EST Sat Dec 6 2025

.TODAY...SE winds 5 to 10 kt, becoming SW this afternoon. Seas
around 2 ft. Wave Detail: SE 2 ft at 4 seconds and W 1 foot at
3 seconds. A slight chance of rain this morning.
.TONIGHT...NW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: W
2 ft at 3 seconds and S 2 ft at 7 seconds.
.SUN...N winds 5 to 10 kt, becoming W in the afternoon. Seas 2 to
3 ft. Wave Detail: NW 2 ft at 4 seconds and S 2 ft at 7 seconds.
.SUN NIGHT...W winds 10 to 15 kt, becoming NW 15 to 20 kt with
gusts up to 25 kt after midnight. Seas 2 to 3 ft. Wave Detail: W
3 ft at 4 seconds and S 2 ft at 7 seconds.
.MON AND MON NIGHT...N winds 20 to 25 kt. Seas 2 to 4 ft. Wave
Detail: N 4 ft at 5 seconds and SW 2 ft at 6 seconds.
.TUE...SW winds 15 to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft
at 4 seconds and NE 1 foot at 3 seconds.
.TUE NIGHT AND WED...SW winds 20 to 25 kt. Seas 4 to 6 ft. A
chance of rain.
.WED NIGHT...SW winds 20 to 25 kt. Seas 5 to 7 ft. A chance of
rain.

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.

$$

ANZ237-062200-
Block Island Sound-
405 AM EST Sat Dec 6 2025

.TODAY...SE winds around 5 kt, becoming W this afternoon. Seas
around 2 ft. Wave Detail: SE 1 foot at 3 seconds and W 1 foot at
3 seconds. A slight chance of rain.
.TONIGHT...NW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SE
2 ft at 9 seconds and W 1 foot at 3 seconds.
.SUN...N winds 5 to 10 kt, becoming W in the afternoon. Seas 2 to
3 ft. Wave Detail: S 2 ft at 7 seconds and SE 2 ft at 9 seconds.
.SUN NIGHT...W winds 10 to 15 kt, becoming NW 15 to 20 kt with
gusts up to 25 kt after midnight. Seas 2 to 3 ft. Wave Detail: W
3 ft at 4 seconds and SE 3 ft at 8 seconds.
.MON AND MON NIGHT...N winds 15 to 20 kt with gusts up to 25 kt.
Seas 2 to 4 ft. Wave Detail: N 3 ft at 4 seconds and SE 2 ft at
8 seconds.
.TUE...SW winds 15 to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft
at 4 seconds and NE 1 foot at 4 seconds.
.TUE NIGHT...SW winds 20 to 25 kt. Seas 3 to 5 ft.
.WED...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to
5 ft. A chance of rain.
.WED NIGHT...SW winds 20 to 25 kt. Seas 4 to 6 ft. A chance of
rain.

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.

$$

ANZ230-062200-
Boston Harbor-
405 AM EST Sat Dec 6 2025

.TODAY...SW winds around 5 kt, increasing to 5 to 10 kt this
afternoon. Waves 1 foot or less. A slight chance of snow this
morning.
.TONIGHT...W winds 5 to 10 kt. Waves 1 foot or less.
.SUN...NW winds 5 to 10 kt. Waves 1 foot or less.
.SUN NIGHT...SW winds 5 to 10 kt, becoming W 15 to 20 kt after
midnight. Waves 1 foot or less, then around 2 ft after midnight.
.MON AND MON NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt.
Waves around 2 ft.
.TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Waves around
2 ft.
.TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Waves
around 2 ft. A chance of snow.
.WED...SW winds 10 to 15 kt with gusts up to 20 kt. Waves around
2 ft. A chance of rain.
.WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Waves
around 2 ft. Rain likely.

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.

$$

ANZ236-062200-
Narragansett Bay-
405 AM EST Sat Dec 6 2025

.TODAY...SE winds around 5 kt, becoming SW this afternoon. Waves
1 foot or less, then around 2 ft this afternoon. A slight chance
of rain this morning.
.TONIGHT...NW winds 5 to 10 kt. Waves around 2 ft.
.SUN...NW winds 5 to 10 kt, becoming W in the afternoon. Waves
around 2 ft.
.SUN NIGHT...W winds 5 to 10 kt, becoming NW 10 to 15 kt with
gusts up to 20 kt after midnight. Waves around 2 ft.
.MON AND MON NIGHT...N winds 15 to 20 kt with gusts up to 25 kt.
Waves 2 to 3 ft.
.TUE...SW winds 10 to 15 kt with gusts up to 20 kt. Waves around
2 ft.
.TUE NIGHT THROUGH WED NIGHT...SW winds 15 to 20 kt with gusts up
to 25 kt. Waves 2 to 4 ft. A chance of rain.

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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