Massachusetts and Rhode Island · Today

Nantasket Beach

Updated Tue, Sep 22, 7:40 PM EDT

When to go

No clear pick yet

There is not enough current forecast information to choose a spot.

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What's missing?

No usable upcoming daylight wave or wind evidence is available. Check Tomorrow if today’s daylight has ended.

Other wind windows

Plan around the wind

The best available upcoming daylight wind sample to compare with the wave evidence. This compares wind only; wave size, tide suitability, and hazards can change your choice.

No upcoming daytime sample has current, finite wind evidence.

How these periods are chosen

The planner prefers three consecutive hourly samples covering two daylight hours, but retains shorter one- or two-sample evidence when that is all the forecast provides. Light wind means at most 6 kt. Moderate offshore means at most 12 kt from land toward the sea when shore orientation is verified. Strong wind or known gusts of 20 kt or more remain visible as cautions instead of making the entire comparison disappear. These are comparison labels, not locally tested surf-quality or safety ratings. Missing gusts remain unknown. Terrain shelter, currents, closures, and your ability are not assessed.

Forecast confidence

Returned marine grid point is 7.2 km from the mapped spot. Provider grid resolution is not established for this response.
Reference model hour: 0 hours from now; historical residuals do not measure forecast lead-time error.
No accepted local model for these inputs: missing history, unsupported direction/period/height, or failed historical validation.
A mapped coordinate does not establish nearshore grid resolution or terrain/shelter accuracy.

Wind NE 9.6 kt

Tide 8 ft rising

Wave, wind and tide details

Offshore model swellE 2.1 ft @ 5sValid 2026-09-22 20:00 · America/New_YorkMarine grid 42.3750, -70.8750 · offshore model, not a local measurement

Offshore model sea2.8 ft @ 4.8sSignificant wave height including wind waves and swell; not breaking surfValid 2026-09-22 20:00 · America/New_York

Model windNE 9.6 ktonshoreValid 2026-09-22 20:00 · America/New_York7.0 kt onshore component

Tide8 ftrisingBoston station 8443970 · predicted height relative to MLLWRetrieved Sep 22, 7:45 PM EDT · provider issue time unavailable84% of adjacent local low–high range · descriptive, not a safety rating

Surf height unavailable. Coastal and offshore waves are not breaking-wave heights.

Surf and wind

Recommended window: No recommended window

Breaking surf is not reliably resolved. Hourly offshore swell and wind inputs are listed below.

Hourly forecast

Hourly surf forecast for Nantasket Beach
Time	Wind	Tide	Offshore swell
12 AM	NNE 6.2 ktcross-shore	4.5 ftfalling	E 1.3 ft @ 4s
1 AM	NNW 7.7 ktcross-shore	3.5 ftfalling	E 1.2 ft @ 4s
2 AM	N 11.5 ktcross-shore	2 ftnear low	E 1.2 ft @ 4s
3 AM	N 10.5 ktcross-shore	2 ftrising	E 1.1 ft @ 4s
4 AM	N 12.1 ktcross-shore	3 ftrising	E 1.1 ft @ 5s
5 AM	NNE 15.1 ktcross-shore	4 ftrising	E 1.0 ft @ 5s
6 AM	NNE 14.8 ktcross-shore	5 ftrising	E 1.1 ft @ 5s
7 AM	NNE 17 ktcross-shore	6.5 ftrising	E 1.3 ft @ 5s
8 AM	NE 14.7 ktcross-shore	7.5 ftrising	E 1.4 ft @ 5s
9 AM	NNE 14.9 ktcross-shore	8 ftfalling	E 1.6 ft @ 5s
10 AM	NNE 14.2 ktcross-shore	7 ftfalling	E 1.8 ft @ 5s
11 AM	NNE 15.2 ktcross-shore	6 ftfalling	E 2.0 ft @ 5s
Noon	NNE 15.8 ktcross-shore	5 ftfalling	E 2.0 ft @ 5s
1 PM	NNE 14.1 ktcross-shore	4 ftfalling	E 1.9 ft @ 5s
2 PM	NNE 12.6 ktcross-shore	3 ftfalling	E 1.9 ft @ 5s
3 PM	NNE 12.5 ktcross-shore	2.5 ftrising	E 2.0 ft @ 5s
4 PM	NNE 13.1 ktcross-shore	3.5 ftrising	E 2.0 ft @ 5s
5 PM	NNE 13.7 ktcross-shore	4.5 ftrising	E 2.1 ft @ 5s
6 PM	NE 10.5 ktcross-shore	6 ftrising	E 2.1 ft @ 5s
7 PM	NE 9 ktcross-shore	7 ftrising	E 2.1 ft @ 5s
8 PM	NE 9.6 ktonshore	8 ftrising	E 2.1 ft @ 5s
9 PM	NE 9.7 ktonshore	9.5 ftnear high	E 2.0 ft @ 5s
10 PM	NE 9.8 ktonshore	8 ftfalling	E 2.0 ft @ 5s
11 PM	NE 10.5 ktonshore	7 ftfalling	E 2.0 ft @ 5s

12 AMUnavailable

WindNNE 6.2 ktcross-shoreTide4.5 ftfallingOffshore swellE 1.3 ft @ 4s

1 AMUnavailable

WindNNW 7.7 ktcross-shoreTide3.5 ftfallingOffshore swellE 1.2 ft @ 4s

2 AMUnavailable

WindN 11.5 ktcross-shoreTide2 ftnear lowOffshore swellE 1.2 ft @ 4s

3 AMUnavailable

WindN 10.5 ktcross-shoreTide2 ftrisingOffshore swellE 1.1 ft @ 4s

4 AMUnavailable

WindN 12.1 ktcross-shoreTide3 ftrisingOffshore swellE 1.1 ft @ 5s

5 AMUnavailable

WindNNE 15.1 ktcross-shoreTide4 ftrisingOffshore swellE 1.0 ft @ 5s

6 AMUnavailable

WindNNE 14.8 ktcross-shoreTide5 ftrisingOffshore swellE 1.1 ft @ 5s

7 AMUnavailable

WindNNE 17 ktcross-shoreTide6.5 ftrisingOffshore swellE 1.3 ft @ 5s

8 AMUnavailable

WindNE 14.7 ktcross-shoreTide7.5 ftrisingOffshore swellE 1.4 ft @ 5s

9 AMUnavailable

WindNNE 14.9 ktcross-shoreTide8 ftfallingOffshore swellE 1.6 ft @ 5s

10 AMUnavailable

WindNNE 14.2 ktcross-shoreTide7 ftfallingOffshore swellE 1.8 ft @ 5s

11 AMUnavailable

WindNNE 15.2 ktcross-shoreTide6 ftfallingOffshore swellE 2.0 ft @ 5s

NoonUnavailable

WindNNE 15.8 ktcross-shoreTide5 ftfallingOffshore swellE 2.0 ft @ 5s

1 PMUnavailable

WindNNE 14.1 ktcross-shoreTide4 ftfallingOffshore swellE 1.9 ft @ 5s

2 PMUnavailable

WindNNE 12.6 ktcross-shoreTide3 ftfallingOffshore swellE 1.9 ft @ 5s

3 PMUnavailable

WindNNE 12.5 ktcross-shoreTide2.5 ftrisingOffshore swellE 2.0 ft @ 5s

4 PMUnavailable

WindNNE 13.1 ktcross-shoreTide3.5 ftrisingOffshore swellE 2.0 ft @ 5s

5 PMUnavailable

WindNNE 13.7 ktcross-shoreTide4.5 ftrisingOffshore swellE 2.1 ft @ 5s

6 PMUnavailable

WindNE 10.5 ktcross-shoreTide6 ftrisingOffshore swellE 2.1 ft @ 5s

7 PMUnavailable

WindNE 9 ktcross-shoreTide7 ftrisingOffshore swellE 2.1 ft @ 5s

8 PMUnavailable

WindNE 9.6 ktonshoreTide8 ftrisingOffshore swellE 2.1 ft @ 5s

9 PMUnavailable

WindNE 9.7 ktonshoreTide9.5 ftnear highOffshore swellE 2.0 ft @ 5s

10 PMUnavailable

WindNE 9.8 ktonshoreTide8 ftfallingOffshore swellE 2.0 ft @ 5s

11 PMUnavailable

WindNE 10.5 ktonshoreTide7 ftfallingOffshore swellE 2.0 ft @ 5s

Tide

Boston station 8443970 · MLLW

Interpolated tide height Recommended window

About this spot

Model-grid forecast requested at the mapped coordinate; reef, headland, and nearshore transformations are unresolved. Beach break.

Mapped spot coordinate: 42.31, -70.88.

Mainland · Coast not verified · Ocean-facing bearing 90° · Location provenance

Model request point: Nantasket Beach (42.31, -70.88). Model output times describe valid conditions; the provider does not expose the model run issue time in this response.

Forecast sources

Data coverage 3/5 sources

Source availability is not forecast accuracy. Where an empirical model passes historical testing, its error and interval coverage are shown above. Source count cannot increase that confidence.

Coverage tier A · US_EAST · spot-level model point

Official breaking-surf report not connected for Massachusetts and Rhode IslandUnavailableUnavailable · Unavailable

US National Weather Service Surf Zone Forecast
No current NWS surf-zone period passed the explicit per-spot forecast-zone assignment.UnavailableNo source time
NOAA NDBC real-time station files
No current reading was available from this spot’s explicitly assigned seaward NDBC buoy.UnavailableNo source time
NOAA CO-OPS Tides and Currents API
Boston station 8443970; predicted high/low events above MLLW, converted to feet. Timestamp is retrieval time; provider issue time is not supplied.CurrentSep 22, 7:45 PM EDT
Open-Meteo Marine API
1 of 1 configured model points availableCurrentSep 22, 7:45 PM EDT
Open-Meteo Weather API
1 of 1 configured model points availableCurrentSep 22, 7:45 PM EDT
Surf-Forecast public pages
Spot discovery and break-specific HTML fallbackNot applicableNo source time
Surfline public spot pages
Break-specific comparison, cams, and metadataNot applicableNo source time

How best guesses are made

Best guesses combine usable wave and wind evidence, with qualitative confidence and specific limitations. A missing tide or local surf-height model does not prevent useful guidance. Tide levels use the named station datum; their effect at this break remains uncertain. Wind direction is relative to the mapped beach orientation, without calibrated terrain or shelter effects. The comparison is a heuristic, not a measured quality rating.