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. First light looks cleanest — 3-4ft on E swell at 10s with barely a breath of wind. The SW wind kicks in by afternoon — 12mph and fair by then.
Sun, May 17: 1–2ft, 9s period, rated Poor. Not the most exciting day — 1-2ft and poor conditions with 9mph from the SW. Afternoon breeze fills in to 14mph.
Mon, May 18: 0–1ft, 8s period, rated Very Poor. Not the most exciting day — 0-1ft 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, 3s period, rated Very Poor. Slim pickings today — 0-1ft and very poor with 10mph SW winds. Expect the wind to bump up to around 17mph by PM.
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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 3-4ft with a 9.9s 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 Green Harbor is 3-4ft, produced by a 2.8ft E primary swell at 10s. 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 9 AM to 12 PM with 3ft waves, a 9.9s swell period, and conditions rated Fair - Good. 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.
