995
FZUS51 KBOX 040806
CWFBOX

Coastal Waters Forecast for Massachusetts and Rhode Island
National Weather Service Boston/Norton MA
406 AM EDT Fri Jul 4 2025

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

ANZ200-042100-
406 AM EDT Fri Jul 4 2025

.Synopsis for Massachusetts and Rhode Island coastal waters...
High pressure builds over the region today and Sat, then settles
south of the region Sun into next week. Low pressure approaches
middle of next week.

$$

ANZ250-042100-
Coastal waters east of Ipswich Bay and the Stellwagen Bank
National Marine Sanctuary-
406 AM EDT Fri Jul 4 2025

.TODAY...NW winds 10 to 15 kt with gusts up to 20 kt, becoming W
5 to 10 kt this afternoon. Seas 2 to 3 ft. Wave Detail: NW 2 ft
at 3 seconds and S 2 ft at 7 seconds.
.TONIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: NW
2 ft at 3 seconds and S 2 ft at 7 seconds.
.SAT...W winds 5 to 10 kt, becoming S 10 to 15 kt in the
afternoon. Seas 2 to 3 ft. Wave Detail: S 2 ft at 7 seconds and
NW 1 foot at 3 seconds.
.SAT NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Seas
2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and SE 2 ft at
8 seconds.
.SUN...SW winds 15 to 20 kt. Gusts up to 20 kt, increasing to
30 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: SW 4 ft at
4 seconds and SE 1 foot at 8 seconds.
.SUN NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas
3 to 5 ft. Wave Detail: SW 4 ft at 5 seconds and SE 1 foot at
8 seconds.
.MON AND MON NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt.
Seas 2 to 4 ft.
.TUE AND TUE NIGHT...SW 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.

$$

ANZ251-042100-
Massachusetts Bay and Ipswich Bay-
406 AM EDT Fri Jul 4 2025

.TODAY...NW winds around 10 kt. Seas around 2 ft. Wave Detail: NW
2 ft at 3 seconds and S 1 foot at 5 seconds.
.TONIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NW
1 foot at 3 seconds and S 1 foot at 5 seconds.
.SAT...W winds 5 to 10 kt, becoming S 10 to 15 kt in the
afternoon. Seas around 2 ft. Wave Detail: NW 1 foot at 3 seconds
and S 1 foot at 6 seconds.
.SAT NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas
around 2 ft. Wave Detail: S 2 ft at 3 seconds and NW 1 foot at
3 seconds.
.SUN AND SUN 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 E 1 foot at
8 seconds.
.MON...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
8 seconds.
.MON NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas
2 to 3 ft. A chance of showers.
.TUE AND TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt,
becoming W. Seas around 2 ft. A chance of showers and tstms. Vsby
1 to 3 NM.

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.

$$

ANZ231-042100-
Cape Cod Bay-
406 AM EDT Fri Jul 4 2025

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

$$

ANZ254-042100-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
406 AM EDT Fri Jul 4 2025

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

$$

ANZ255-042100-
Coastal Waters extending out to 25 nm South of Marthas Vineyard
and Nantucket-
406 AM EDT Fri Jul 4 2025

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

$$

ANZ256-042100-
Coastal Waters from Montauk NY to Marthas Vineyard extending out
to 20 nm South of Block Island-
406 AM EDT Fri Jul 4 2025

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

$$

ANZ232-042100-
Nantucket Sound-
406 AM EDT Fri Jul 4 2025

.TODAY...NW winds around 10 kt, becoming SW this afternoon. Seas
around 2 ft. Wave Detail: NW 1 foot at 3 seconds and SE 1 foot at
8 seconds.
.TONIGHT...SW winds 5 to 10 kt, becoming NW after midnight. Seas
around 2 ft. Wave Detail: W 1 foot at 3 seconds and S 1 foot at
7 seconds.
.SAT...W winds around 5 kt, becoming SW in the afternoon. Seas
around 2 ft. Wave Detail: NW 1 foot at 2 seconds and S 1 foot at
7 seconds.
.SAT 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 4 seconds and
SE 1 foot at 8 seconds.
.SUN AND SUN 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 8 seconds.
.MON AND MON 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 8 seconds.
.TUE AND TUE 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.

$$

ANZ233-042100-
Vineyard Sound-
406 AM EDT Fri Jul 4 2025

.TODAY...NW winds 5 to 10 kt, becoming SW this afternoon. Seas
around 2 ft. Wave Detail: S 2 ft at 7 seconds and NW 1 foot at
3 seconds.
.TONIGHT...W winds 5 to 10 kt, becoming N after midnight. Seas
around 2 ft. Wave Detail: S 2 ft at 7 seconds and W 1 foot at
3 seconds.
.SAT...NW winds around 5 kt, becoming SW in the afternoon. Seas
around 2 ft. Wave Detail: S 2 ft at 7 seconds and NW 1 foot at
3 seconds.
.SAT 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.
.SUN AND SUN NIGHT...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 SE 1 foot
at 9 seconds.
.MON AND MON 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 SE 1 foot
at 8 seconds.
.TUE AND TUE NIGHT...SW 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.

$$

ANZ234-042100-
Buzzards Bay-
406 AM EDT Fri Jul 4 2025

.TODAY...NW winds 5 to 10 kt, becoming SW this afternoon. Seas
around 2 ft. Wave Detail: SW 2 ft at 7 seconds and NW 1 foot at
3 seconds.
.TONIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW
2 ft at 6 seconds and W 1 foot at 3 seconds.
.SAT...W winds around 5 kt, becoming SW 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 and NW 1 foot at 3 seconds.
.SAT 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.
.SUN AND SUN NIGHT...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 SE 1 foot
at 8 seconds.
.MON AND MON NIGHT...SW winds 15 to 20 kt, diminishing to 10 to
15 kt. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at
4 seconds and SE 1 foot at 8 seconds.
.TUE AND TUE NIGHT...SW 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.

$$

ANZ235-042100-
Rhode Island Sound-
406 AM EDT Fri Jul 4 2025

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

$$

ANZ237-042100-
Block Island Sound-
406 AM EDT Fri Jul 4 2025

.TODAY...NW winds 5 to 10 kt, becoming SW this afternoon. Seas
2 to 3 ft. Wave Detail: S 3 ft at 8 seconds and NW 1 foot at
3 seconds.
.TONIGHT...W winds 5 to 10 kt, becoming N after midnight. Seas
2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and W 1 foot at
3 seconds.
.SAT...NW winds around 5 kt, becoming SW in the afternoon. Seas
around 2 ft. Wave Detail: S 2 ft at 7 seconds and NW 1 foot at
2 seconds.
.SAT NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt after
midnight. Seas 2 to 3 ft. Wave Detail: S 2 ft at 7 seconds and W
1 foot at 3 seconds.
.SUN AND SUN 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 SE 1 foot
at 9 seconds.
.MON...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.
.MON NIGHT THROUGH TUE 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.

$$

ANZ230-042100-
Boston Harbor-
406 AM EDT Fri Jul 4 2025

.TODAY...NW winds 5 to 10 kt. Waves around 2 ft.
.TONIGHT...NW winds 5 to 10 kt. Waves around 2 ft in the evening,
then 1 foot or less.
.SAT...W winds around 5 kt, becoming S in the afternoon. Waves
1 foot or less, then around 2 ft in the afternoon.
.SAT NIGHT...SW winds 10 to 15 kt. Waves around 2 ft.
.SUN AND SUN NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt.
Waves around 2 ft.
.MON...SW winds 10 to 15 kt with gusts up to 20 kt. Waves around
2 ft.
.MON NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Waves
around 2 ft. A chance of showers.
.TUE AND TUE NIGHT...SW winds around 10 kt, becoming W. Waves
around 2 ft, then 1 foot or less. A chance of showers and tstms.

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.

$$

ANZ236-042100-
Narragansett Bay-
406 AM EDT Fri Jul 4 2025

.TODAY...NW winds 5 to 10 kt, becoming W this afternoon. Waves
around 2 ft.
.TONIGHT...NW winds 5 to 10 kt. Waves around 2 ft.
.SAT...NW winds around 5 kt, becoming SW 10 to 15 kt in the
afternoon. Waves around 2 ft.
.SAT NIGHT...SW winds 10 to 15 kt. Waves around 2 ft.
.SUN AND SUN NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt.
Waves 2 to 3 ft.
.MON...SW winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to
3 ft.
.MON NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Waves
2 to 3 ft. A chance of showers.
.TUE AND TUE NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt.
Waves around 2 ft. A chance of showers and tstms.

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