Massachusetts
Skip the dawn patrol — 1-2ft and very poor early on.
Skip the dawn patrol — 1-2ft and very poor early on.
Best window·Friday 3PM–6PM·2-3ft·Fair - Good
Here's how the next 5 days are shaping up at Coskata Beach, Massachusetts. Each day is rated based on breaking wave height, swell period, and wind — updated hourly from the latest NOAA GFS run.
Thu, Sep 3: 2–3ft, 9s period, rated Poor. Skip the dawn patrol — 0-1ft and very poor early on. Surf builds nicely through the day to 2-3ft with poor conditions by the afternoon.
Fri, Sep 4: 2–3ft, 6s period, rated Poor. Morning kicks off with 1-2ft on E swell at 6s.
Sat, Sep 5: 2–3ft, 5s period, rated Very Poor. A slow one — 2-3ft waves and very poor conditions with 18mph N winds.
Sun, Sep 6: 1–2ft, 8s period, rated Very Poor. A slow one — 1-2ft waves and very poor conditions with strong N wind at 27mph.
Mon, Sep 7: 0–1ft, 10s period, rated Very Poor. A slow one — 0-1ft waves and very poor conditions with 15mph NNW winds.
Two days at a glance. Swipe for later hours.Five days at a glance. Drag for later hours.
Poor today — get one free email when Coskata Beach turns Good.
Check Coskata Beach from the lineup
Forecasts, surf alerts, and live conditions in the Swell Intel iPhone app.
Coskata Beach is a remote and wild stretch of coastline on the northeastern tip of Nantucket Island in Massachusetts, offering uncrowded waves shaped by Atlantic swells funneling through Nantucket Sound and the open ocean. The beach faces southeast toward the open Atlantic, picking up solid groundswells from late-season hurricanes and nor'easters that produce punchy, sandbars-driven beach break with both left and right options. Its extreme remoteness — accessible only by 4WD or boat — keeps crowds minimal and rewards adventurous surfers willing to make the trek.
Wave heights shown are breaking wave heights — the actual rideable wave size at this spot.
The current wave height at Coskata Beach is 1-2ft with a 4s swell period. Wind is S at 11mph. Conditions are rated Poor. The forecast updates hourly so you can plan your session around the cleanest windows.
The current breaking wave height at Coskata Beach is 1-2ft, produced by a 3ft S wind swell swell at 4s, a 1.5ft E wind swell swell at 5s, a 1.5ft ESE tertiary swell at 9s. Breaking wave height is the actual rideable wave size at the shore — calculated from offshore swell data using this spot's coastal bathymetry — not the raw buoy reading.
Based on the current 5-day forecast, the best window to surf Coskata Beach is Friday from 3 PM to 6 PM with 3ft waves, a 6.2s swell period, and conditions rated Fair - Good. Check the hourly forecast for updates as conditions can shift.
Coskata Beach works best with a E swell and W winds. Offshore winds groom the face of the wave, while onshore winds turn it sloppy. Cross-offshore conditions usually produce the cleanest shape.
Tide plays a big role at Coskata Beach. Mid tide works for most beach breaks, while reef and point breaks often prefer higher or lower stages. Use the tide chart above to line up your session with the swell peak.
Coskata Beach is a beach with a sand bottom, suited to intermediate surfers. Coskata Beach is a remote and wild stretch of coastline on the northeastern tip of Nantucket Island in Massachusetts, offering uncrowded waves shaped by Atlantic swells funneling through Nantucket Sound and the open ocean. The beach faces southeast toward the open Atlantic, picking up solid groundswells from late-season hurricanes and nor'easters that produce punchy, sandbars-driven beach break with both left and right options. Its extreme remoteness — accessible only by 4WD or boat — keeps crowds minimal and rewards adventurous surfers willing to make the trek.
The prime season at Coskata Beach is fall, when swell direction, wind patterns, and water temps line up most consistently. Outside the peak season you can still score, but you'll need to watch the forecast closely for the right windows.
Common hazards at Coskata Beach include strong currents, rip currents, remote location, cold water, sharks, shifting sandbars, limited access. Always check conditions before paddling out, respect local etiquette, and never surf alone if you're unfamiliar with the break.
Our Coskata Beach forecast uses NOAA GFS and other weather models combined with spot-specific bathymetry to calculate breaking wave heights. Short-range (1-3 day) forecasts are most reliable; extended forecasts show general trends. We also verify our offshore swell predictions against NOAA buoy measurements daily — see our accuracy page for those swell-verification metrics (buoys measure open-water swell, not breaking surf size).
