Coastal Waters Forecast for Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island (ANZ256) (Text-Only)
NWS Forecast for: Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island (ANZ256)
Issued by: National Weather Service Norton, MA
Last Update: 705 PM EDT Mon Jul 7 2025




Tonight: S winds 15 to 20 kt. Seas 3 to 4 ft, building to 4 to 6 ft after midnight. Wave detail: S 4 ft at 7 seconds and SE 1 foot at 14 seconds, becoming S 5 ft at 7 seconds and SE 1 foot at 14 seconds. A slight chance of showers this evening, then a chance of showers after midnight. Vsby 1 nm or less.

Tue: SW winds 10 to 15 kt with gusts up to 20 kt. Seas 5 to 6 ft. Wave detail: S 6 ft at 8 seconds and SE 1 foot at 14 seconds. A chance of showers in the morning with vsby 1 nm or less.

Tue Night: SW winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 6 ft. Wave detail: S 5 ft at 8 seconds and SE 1 foot at 13 seconds. A chance of showers and tstms after midnight. Some tstms may produce gusty winds and heavy rainfall after midnight.

Wed: SW winds around 10 kt. Seas 3 to 5 ft. Wave detail: S 5 ft at 7 seconds and SE 1 foot at 12 seconds. A chance of showers. Vsby 1 to 3 nm in the morning.

Wed Night Through Thu Night: E winds 5 to 10 kt. Seas 3 to 4 ft. Wave detail: S 4 ft at 7 seconds and SE 1 foot at 12 seconds. A chance of showers.

Fri: E winds 10 to 15 kt. Seas 3 to 4 ft. Wave detail: S 4 ft at 7 seconds and E 2 ft at 11 seconds. A chance of showers.

Fri Night Through Sat Night: E 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.







Zone Forecast: Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island (ANZ256)

Visit your local NWS office at: https://www.weather.gov/boston