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: 704 PM EDT Fri Jun 12 2026


Tonight: SW winds 10 to 15 kt, becoming NW after midnight. Gusts up to 20 kt. Seas 3 to 4 ft. Wave detail: SW 4 ft at 6 seconds and SE 1 foot at 9 seconds.

Sat: W winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Wave detail: S 3 ft at 6 seconds and NW 2 ft at 3 seconds.

Sat Night: W winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave detail: W 3 ft at 5 seconds and SE 1 foot at 9 seconds.

Sun: 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: S 3 ft at 7 seconds and SW 2 ft at 3 seconds.

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. A chance of showers in the evening, then showers after midnight.

Mon: W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave detail: SW 3 ft at 5 seconds and SE 1 foot at 8 seconds. Showers likely in the morning.

Mon Night: W winds 10 to 15 kt with gusts up to 20 kt, becoming NW after midnight. Seas 2 to 4 ft.

Tue Through Wed Night: S winds 10 to 15 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.







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