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coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
403 pm edt wed oct 21 2026

coastal waters from the merrimack river ma to watch hill ri out
to 60 nm


anz230-220900-
boston harbor-
403 pm edt wed oct 21 2026

...small craft advisory in effect through late thursday night...

.tonight...ne winds 15 to 20 kt with gusts up to 25 kt. waves
2 to 3 ft, except 3 to 5 ft at the outer harbor entrance. 
.thu...n winds 15 to 20 kt with gusts up to 25 kt. waves around
2 ft, except 3 to 5 ft at the outer harbor entrance. 
.thu night...n winds 15 to 20 kt with gusts up to 25 kt. waves
around 2 ft, except 3 to 5 ft at the outer harbor entrance. 
.fri...n winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. gusts up to 25 kt. waves around 2 ft, except 3 to 5 ft
at the outer harbor entrance. 
.fri night...n winds 5 to 10 kt. waves 1 foot or less, except
2 to 4 ft at the outer harbor entrance. 
.sat and sat night...w winds around 5 kt. waves 1 foot or less. 
.sun through mon night...nw winds 5 to 10 kt. waves 1 foot or
less.  

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.

$$

fzus51 kbox 212003
cwfbox
expires:202610220900;;956240

coastal waters forecast for massachusetts and rhode island
national weather service boston/norton ma
403 pm edt wed oct 21 2026

coastal waters from the merrimack river ma to watch hill ri out
to 60 nm


anz250-220900-
coastal waters east of ipswich bay and the stellwagen bank
national marine sanctuary-
403 pm edt wed oct 21 2026

...small craft advisory in effect through thursday morning...
...gale warning in effect from thursday morning through friday
afternoon...

.tonight...ne winds 20 to 25 kt with gusts up to 35 kt. seas 8 to
9 ft. wave detail: e 9 ft at 10 seconds and nw 3 ft at 5 seconds.
a slight chance of light rain. 
.thu...n winds 20 to 25 kt with gusts up to 35 kt. seas 7 to
9 ft. wave detail: e 9 ft at 9 seconds and n 5 ft at 6 seconds. 
.thu night...n winds 25 to 30 kt with gusts up to 35 kt. seas
7 to 10 ft. wave detail: n 10 ft at 7 seconds. 
.fri...n winds 20 to 25 kt, diminishing to 15 to 20 kt in the
afternoon. gusts up to 30 kt. seas 8 to 10 ft, subsiding to 6 to
9 ft in the afternoon. wave detail: ne 10 ft at 9 seconds and n
7 ft at 7 seconds, becoming ne 9 ft at 9 seconds and n 5 ft at
6 seconds. 
.fri night...n winds 10 to 15 kt with gusts up to 20 kt,
diminishing to 5 to 10 kt after midnight. seas 5 to 7 ft. wave
detail: ne 7 ft at 9 seconds and nw 2 ft at 6 seconds. 
.sat and sat night...w winds 5 to 10 kt. seas 3 to 5 ft. wave
detail: nw 5 ft at 3 seconds and ne 5 ft at 9 seconds. 
.sun through mon night...nw 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.

$$