Massachusetts
Here's how the next 5 days are shaping up at Green Harbor, 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: 2–3ft, 10s period, rated Fair. Rideable all day with 2-3ft waves on E swell at 10s and 12mph from the SW.
Sun, May 17: 1–2ft, 9s period, rated Poor. Slim pickings today — 1-2ft and poor with 9mph from the SW. Winds do pick up a bit by the afternoon to 14mph.
Mon, May 18: 0–1ft, 8s period, rated Very Poor. A slow one — 0-1ft waves and very poor conditions with light E winds. Afternoon breeze fills in to 10mph.
Tue, May 19: 0–1ft, 9s period, rated Very Poor. Pretty quiet out there — 0-1ft and mostly very poor with moderate SW wind around 10mph.
Wed, May 20: 0–1ft, 4s period, rated Very Poor. Pretty quiet out there — 0-1ft and mostly very poor with moderate SW wind around 10mph. Winds do pick up a bit by the afternoon to 17mph.
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Green Harbor is a sheltered beach break on the South Shore of Massachusetts that picks up Atlantic swell and nor'easter energy, offering forgiving sandy bottom conditions ideal for learning surfers. The bay-facing orientation provides protection from the strongest winter storms while still capturing quality autumn and early winter swells. With consistent sandbars and mellow wave formations, this is a welcoming spot for beginners looking to progress in a relaxed, less-crowded environment.
Wave heights shown are breaking wave heights — the actual rideable wave size at this spot.
The current wave height at Green Harbor is 2-3ft with a 9.65s swell period. Wind is SW at 11mph and conditions are rated Fair. The forecast updates hourly so you can plan your session around the cleanest windows.
The current breaking wave height at Green Harbor is 2-3ft, produced by a 2.3ft E primary swell at 10s, a 0.7ft SW 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 Green Harbor is Saturday from 10 AM to 1 PM with 3ft waves, a 9.65s swell period, and conditions rated Fair. Check the hourly forecast for updates as conditions can shift.
Green Harbor 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 Green Harbor. 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.
Green Harbor is a beach with a sand bottom, suited to beginner surfers. Green Harbor is a sheltered beach break on the South Shore of Massachusetts that picks up Atlantic swell and nor'easter energy, offering forgiving sandy bottom conditions ideal for learning surfers. The bay-facing orientation provides protection from the strongest winter storms while still capturing quality autumn and early winter swells. With consistent sandbars and mellow wave formations, this is a welcoming spot for beginners looking to progress in a relaxed, less-crowded environment.
The prime season at Green Harbor 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 Green Harbor include strong currents during storm swells, seasonal sandbars shifting. Always check conditions before paddling out, respect local etiquette, and never surf alone if you're unfamiliar with the break.
Our Green Harbor 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.
