Marine forecast
Martha’s Vineyard & Nantucket Coastal Waters
- current wind
- 10 kt SE
- Gusts
- 16 kt
- Seas
- 3.0 ft
- Period
- 8 sec
- Air
- 62°F
Observed Tue 3:00 PM | ANZ255
- Gusts now
- 16 kt
- Seas now
- 3.0 ft · 8 sec
- Air
- 62°F
- Water
- 61°F
- 72-hr peak
- 25 kt
In brief
At 3:00 pm EDT on Oct 13, 2026, NDBC station NTKM3 (Nantucket Island, MA, 10 miles away) measured wind from the SE at 10 kt, gusting to 16 kt; buoy 44085 measured seas of 3.0 ft. The NWS forecast for Martha’s Vineyard & Nantucket Coastal Waters, MA issued at 1:04 pm EDT on Oct 13, 2026 reads, for this afternoon: “SE winds 10 to 15 kt. Seas 3 to 4 ft.” A Small Craft Advisory is in effect until Wed 8:00 PM.
Source: National Weather Service Boston/Norton MA forecast; NDBC observations
Wind forecast · ktPeak 25 kt
Seas forecast · ftPeak 5 ft
Marine advisory
Small Craft Advisory in effect for Martha’s Vineyard & Nantucket Coastal Waters until Wed 8:00 PM.
Full text of this small craft advisory
* WHAT...Southwest winds 15 to 25 kt and seas 4 to 6 feet expected. * WHERE...In Massachusetts coastal waters, Coastal Waters extending out to 25 NM South of Marthas Vineyard and Nantucket. In Rhode Island coastal waters, Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 NM South of Block Island. * WHEN...From midnight tonight to 8 PM EDT Wednesday. * IMPACTS...Conditions will be hazardous to small craft.
NWS marine forecast
| Period | Forecast |
|---|---|
| This Afternoon | SE winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: E 3 ft at 7 seconds and S 3 ft at 8 seconds. Patchy drizzle. |
| Tonight | S winds 15 to 20 kt, becoming SW 20 to 25 kt after midnight. Seas 3 to 4 ft, building to 4 to 6 ft after midnight. Wave Detail: S 3 ft at 4 seconds and E 3 ft at 7 seconds, becoming S 6 ft at 6 seconds and E 3 ft at 7 seconds. |
| Wed | SW winds 15 to 20 kt with gusts up to 25 kt. Seas 5 to 7 ft. Wave Detail: SW 6 ft at 7 seconds and SE 4 ft at 10 seconds. |
| Wed Night | W winds around 15 kt, becoming NW after midnight. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 7 seconds and E 2 ft at 8 seconds. |
| Thu | N winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: NW 4 ft at 5 seconds and NE 3 ft at 8 seconds. |
| Thu Night | NE winds 5 to 10 kt, becoming SE after midnight. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 5 seconds and NE 2 ft at 7 seconds. |
| Fri | S winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 5 ft. Showers with a chance of tstms. |
| Fri Night | W winds 30 to 40 kt. Seas 8 to 11 ft. Showers with a chance of tstms. |
| Sat | NW winds 30 to 40 kt. Seas 9 to 12 ft. |
| Sat Night | NW winds 25 to 35 kt. Seas 7 to 10 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. |
Issued Tue 1:04 PM by Boston/Norton MA (product CWFBOX).
Recent buoy conditions
| Time | Wind | Gust | Seas | Water |
|---|---|---|---|---|
| Tue 3:00 PM | 10 kt SE | 16 kt | — | 61°F |
| Tue 2:54 PM | 9 kt SE | 15 kt | — | 61°F |
| Tue 1:54 PM | 12 kt SE | 15 kt | — | 61°F |
| Tue 12:54 PM | 8 kt SE | 14 kt | — | 61°F |
| Tue 11:54 AM | 6 kt ESE | 12 kt | — | 61°F |
| Tue 10:54 AM | 7 kt ESE | 12 kt | — | 61°F |
| Tue 9:54 AM | 12 kt E | 14 kt | — | 61°F |
| Tue 8:54 AM | 7 kt ENE | 13 kt | — | 60°F |
| Tue 7:54 AM | 9 kt ENE | 12 kt | — | 61°F |
| Tue 6:54 AM | 11 kt ENE | 15 kt | — | 61°F |
| Tue 5:54 AM | 7 kt ENE | 13 kt | — | 61°F |
| Tue 4:54 AM | 8 kt ENE | 11 kt | — | 61°F |
Observed Tue 3:00 PM at NDBC buoy NTKM3 (Nantucket Island, MA), 10.2 miles away. Seas from buoy 44085 (Buzzards Bay, MA (260)), 41.1 miles away, at Tue 3:00 PM.
Frequently asked questions
What is the marine forecast for Martha’s Vineyard & Nantucket Coastal Waters today?
This Afternoon: SE winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: E 3 ft at 7 seconds and S 3 ft at 8 seconds. Patchy drizzle.
Is there a small craft advisory for Martha’s Vineyard & Nantucket Coastal Waters?
Yes — small craft advisory in effect until Wed 8:00 PM.
How high are the waves at Martha’s Vineyard & Nantucket Coastal Waters right now?
Seas are running 3.0 ft at a 8-second period, measured at NDBC buoy NTKM3 Tue 3:00 PM, 10.2 miles from this zone. The forecast peaks at 5.0 ft Wed 4 AM.
What is the water temperature at Martha’s Vineyard & Nantucket Coastal Waters?
The nearest buoy read 61°F (16°C) at Tue 3:00 PM. Sea surface temperature at a single buoy can differ by several degrees from the water at a beach or in a shallow bay nearby.
What do the wind speeds in knots mean?
One knot is 1.15 mph. The National Weather Service issues a small craft advisory for sustained winds of roughly 22–33 knots or hazardous seas, a gale warning at 34–47 knots, and a storm warning at 48 knots and above. Exact advisory thresholds vary by forecast office and by water body — a bay reaches dangerous chop at a lower wind speed than open ocean.
Where does this forecast come from?
The forecast text is the National Weather Service's own marine bulletin for zone ANZ255, issued by Boston/Norton MA, reproduced in full. The wind and seas charts are drawn from the NWS gridded forecast for a point inside the zone. Observations come from the nearest reporting NDBC buoy. We are not affiliated with NOAA or the National Weather Service.
Forecast: NOAA/NWS product CWFBOX, issued Tue 1:04 PM. Observations: NOAA National Data Buoy Center station NTKM3, read Tue 3:00 PM. Retrieved Oct 13, 3:42 PM. Conditions offshore change faster than any page can be rebuilt, so check the current NWS bulletin and your own instruments before going out.