Marine forecast
Cape Cod Bay, MA
- current wind
- 1 kt ESE
- Seas
- 2.0 ft
- Period
- 3 sec
- Air
- 61°F
- 72-hr peak
- 21 kt
Observed Tue 3:00 PM | ANZ231
- Seas now
- 2.0 ft · 3 sec
- Air
- 61°F
- 72-hr peak
- 21 kt
- Peak seas
- 3 ft
In brief
At 3:00 pm EDT on Oct 13, 2026, NDBC station WAXM3 (Carriage House, Waquoit Bay Reserve, MA, 26 miles away) measured wind from the ESE at 1 kt; buoy 44090 measured seas of 2.0 ft. The NWS forecast for Cape Cod Bay, MA issued at 1:04 pm EDT on Oct 13, 2026 reads, for this afternoon: “SE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft.” A Small Craft Advisory is in effect until Wed 12:00 PM.
Source: National Weather Service Boston/Norton MA forecast; NDBC observations
Wind forecast · ktPeak 21 kt
Seas forecast · ftPeak 3 ft
Marine advisory
Small Craft Advisory in effect for Cape Cod Bay until Wed 12:00 PM.
Full text of this small craft advisory
* WHAT...Southwest winds 15 to 25 kt and seas 3 to 5 feet expected. * WHERE...Portions of Massachusetts coastal waters and Rhode Island coastal waters. * WHEN...From midnight tonight to noon EDT Wednesday. * IMPACTS...Conditions will be hazardous to small craft.
NWS marine forecast
| Period | Forecast |
|---|---|
| This Afternoon | SE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 4 seconds and NW 1 foot at 4 seconds. Patchy drizzle. |
| Tonight | S winds 10 to 15 kt, becoming SW 15 to 20 kt after midnight. Seas 2 to 4 ft. Wave Detail: S 3 ft at 3 seconds and SE 3 ft at 7 seconds. A chance of showers. |
| Wed | SW winds 10 to 15 kt. Gusts up to 20 kt in the morning. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and NE 2 ft at 7 seconds. |
| Wed Night | NW winds around 10 kt, increasing to 15 to 20 kt with gusts up to 25 kt after midnight. Seas 2 to 3 ft. Wave Detail: N 3 ft at 5 seconds and SE 1 foot 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 2 to 3 ft. Wave Detail: N 3 ft at 6 seconds and SE 1 foot at 10 seconds. |
| Thu Night | NE winds around 5 kt, becoming SE after midnight. Seas around 2 ft. Wave Detail: N 2 ft at 6 seconds and SE 1 foot at 15 seconds. |
| Fri | S winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft. Showers. |
| Fri Night | W winds 25 to 30 kt with gusts up to 40 kt. Seas 3 to 5 ft. Showers. |
| Sat And Sat Night | NW winds 25 to 30 kt with gusts up to 40 kt. Seas 4 to 6 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. |
Issued Tue 1:04 PM by Boston/Norton MA (product CWFBOX).
Recent buoy conditions
| Time | Wind | Gust | Seas | Water |
|---|---|---|---|---|
| Tue 3:00 PM | 1 kt ESE | — | — | — |
| Tue 2:45 PM | 1 kt ESE | — | — | — |
| Tue 1:45 PM | 3 kt E | — | — | — |
| Tue 12:45 PM | 5 kt E | — | — | — |
| Tue 11:45 AM | 4 kt E | — | — | — |
| Tue 10:45 AM | 3 kt E | — | — | — |
| Tue 9:45 AM | 3 kt E | — | — | — |
| Tue 8:45 AM | 1 kt NE | — | — | — |
| Tue 7:45 AM | 2 kt ENE | — | — | — |
| Tue 6:45 AM | 1 kt NNE | — | — | — |
| Tue 5:45 AM | 2 kt ENE | — | — | — |
| Tue 4:45 AM | 2 kt ENE | — | — | — |
Observed Tue 3:00 PM at NDBC buoy WAXM3 (Carriage House, Waquoit Bay Reserve, MA), 25.5 miles away. Seas from buoy 44090 (Cape Cod Bay, MA (221)), 6.4 miles away, at Tue 3:00 PM.
Frequently asked questions
What is the marine forecast for Cape Cod Bay today?
This Afternoon: SE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 4 seconds and NW 1 foot at 4 seconds. Patchy drizzle.
Is there a small craft advisory for Cape Cod Bay?
Yes — small craft advisory in effect until Wed 12:00 PM.
How high are the waves at Cape Cod Bay right now?
Seas are running 2.0 ft at a 3-second period, measured at NDBC buoy WAXM3 Tue 3:00 PM, 25.5 miles from this zone. The forecast peaks at 3.0 ft Tue 3 PM.
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 ANZ231, 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 WAXM3, 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.