Massachusetts
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.
Sat, May 16: 3–4ft, 10s period, rated Fair - Good. Get out early for the best of it — 3-4ft waves on E swell at 10s and calm winds. Wind fills in through the day, pushing up to 14mph from the SSW and dropping conditions to poor - fair.
Sun, May 17: 0–1ft, 7s period, rated Very Poor. Pretty quiet out there — 1-2ft and mostly poor with moderate SW wind around 12mph.
Mon, May 18: 0–1ft, 7s period, rated Very Poor. Not the most exciting day — 0-1ft and very poor conditions with 13mph E winds.
Tue, May 19: 0–1ft, 9s period, rated Very Poor. Not the most exciting day — 0-1ft and very poor conditions with 16mph SW winds. Afternoon breeze fills in to 23mph.
Wed, May 20: 0–1ft, 6s period, rated Very Poor. A slow one — 0-1ft waves and very poor conditions with 22mph SW winds.
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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 3-4ft with a 9.6s swell period. Wind is WSW at 10mph and conditions are rated Fair - Good. The forecast updates hourly so you can plan your session around the cleanest windows.
The current breaking wave height at Coskata Beach is 3-4ft, produced by a 2.7ft E primary swell at 10s, a 2ft SSE secondary swell at 9s, a 0.6ft W wind swell swell at 2s. 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 Saturday from 9 AM to 12 PM with 4ft waves, a 9.6s 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. See the forecast accuracy card above for per-spot and regional performance metrics.
