Massachusetts
Pretty quiet out there — 0-1ft and mostly very poor with light winds out of the E.
Pretty quiet out there — 0-1ft and mostly very poor with light winds out of the E.
Conditions stay similar this week — check the hourly forecast at Green Harbor for the cleanest windows.
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.
Thu, Sep 3: 0–1ft, 5s period, rated Very Poor. Not the most exciting day — 0-1ft and very poor conditions with light winds out of the E.
Fri, Sep 4: 1–2ft, 7s period, rated Poor. Pretty quiet out there — 1-2ft and mostly poor with gentle N breeze.
Sat, Sep 5: 2–3ft, 5s period, rated Very Poor. Pretty quiet out there — 1-2ft and mostly very poor with 17mph out of the NNW.
Sun, Sep 6: 3–4ft, 8s period, rated Very Poor. Pretty quiet out there — 2-3+ft and mostly very poor with strong N wind at 21mph.
Mon, Sep 7: 1–2ft, 10s period, rated Poor - Fair. First light looks cleanest — 1-2ft on ENE swell at 10s with moderate NW wind around 10mph. Conditions go downhill through the afternoon.
Two days at a glance. Swipe for later hours.Five days at a glance. Drag for later hours.
Very Poor today — get one free email when Green Harbor turns Good.
Check Green Harbor from the lineup
Forecasts, surf alerts, and live conditions in the Swell Intel iPhone app.
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 0-1ft with a 3.1s swell period. Wind is E at 5mph. Conditions are rated Very Poor. The forecast updates hourly so you can plan your session around the cleanest windows.
The current breaking wave height at Green Harbor is 0-1ft, produced by a 1.9ft S wind swell swell at 3s, a 1.6ft E wind swell swell at 4s, a 1.4ft 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 Green Harbor is Monday from 6 AM to 9 AM with 2ft waves, a 9.6s swell period, and conditions rated Poor - 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. 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).
