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Green Harbor Surf Forecast
/ Massachusetts (29 breaks) / Massachusetts (28 breaks) /
Surf Forecasts:
Green Harbor surfForecast / Massachusetts / USA
12 Day Weather and Surf, issued 1 pm Sunday 12 Oct 2025 EDT
Best Forecast Surf Conditions for Green Harbor this week:
The surf forecast for Green Harbor over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Oct 15) at 2AM. The primary swell is predicted to be 1.5m and 10s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Green Harbor in the next 12 days are 3.5m 11s and forecast to arrive on Monday (Oct 13) at 2PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Wednesday (Oct 15) at 11PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Wed 15th Oct) | 5ft (1.5m) 10s |
| Best Surf | 2AM (Wed 15th Oct) | 5ft (1.5m) 10s |
| Most Powerful | 2PM (Mon 13th Oct) | 11ft (3.5m) 11s |
Table - best surf conditions forecast for Green Harbor over the next 12 days.
Short Range Forecast Heavy rain (total 79mm), heaviest during Mon afternoon. Very mild (max 15°C on Wed morning, min 12°C on Mon morning). Winds decreasing (strong winds from the ENE on Sun night, light winds from the NNW by Tue night). | Days 3-6 Weather Summary Mostly dry. Very mild (max 15°C on Wed afternoon, min 7°C on Wed night). Winds decreasing (strong winds from the N on Thu night, light winds from the NNW by Fri night). | ||||||||||||||||||||||
Sun 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | |||||||||||||||||
| PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |||
Rating (10 max) | |||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||||
| Period(s) (?) | 7 | 8 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 7 | 7 | 7 | 7 | 7 | 7 | 9 | 11 | 11 | 10 | 10 | ||
Wave (?)Graph  | |||||||||||||||||||||||
 kJ (?) | 360 | 1351 | 3248 | 3150 | 2253 | 1450 | 863 | 422 | 219 | 146 | 298 | 356 | 369 | 406 | 254 | 131 | 274 | 302 | 240 | 110 | 37 | ||
Wind (km/h) | |||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | off | off | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | on | cross- on | ||
High Tide / height (m) | 4:05PM 3.28 | 4:49AM 2.73 | 5:08PM 3.14 | 5:55AM 2.65 | 6:16PM 3.02 | 7:04AM 2.63 | 7:25PM 2.94 | 8:10AM 2.68 | 8:32PM 2.91 | 9:11AM 2.76 | 9:31PM 2.89 | 10:02AM 2.83 | 10:24PM 2.86 | 10:47AM 2.89 | |||||||||
Low Tide / height (m) | 10:32PM -0.15 | 10:47AM 0.25 | 11:36PM -0.01 | 11:53AM 0.34 | 12:42AM 0.09 | 1:01PM 0.37 | 1:48AM 0.14 | 2:09PM 0.34 | 2:49AM 0.16 | 3:11PM 0.28 | 3:42AM 0.16 | 4:06PM 0.22 | 4:29AM 0.19 | ||||||||||
Sun 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | |||||||||||||||||
| Sunrise | - | - | 6:52 | - | - | 6:52 | - | - | 6:54 | - | - | 6:54 | - | - | 6:56 | - | - | 6:58 | - | - | 6:58 | ||
| Sunset | 6:06 | - | - | 6:04 | - | - | 6:02 | - | - | 6:00 | - | - | 6:00 | - | - | 5:58 | - | - | 5:55 | - | - | ||
 |  |  | | | |  |  | | | |  | | | | |  | | | | | |||
Rain (mm) | 5 | 21 | 12 | 15 | 21 | 5 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | ||
| Temp. °C | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 15 | 15 | 11 | 8 | 11 | 11 | 11 | 13 | 13 | 12 | 14 | 13 | 14 | ||
| Feels °C (?) | 7 | 7 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 9 | 3 | 0 | 3 | 1 | 3 | 8 | 10 | 8 | 10 | 10 | 12 | ||
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Massachusetts
The wind is still offshore at Green Harbor (moderate winds from the ENE at Marshfield Airport 3 km from Green Harbor). A 1.8m windswell from the ENE
1 h 31 min ago
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Green Harbor surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Green Harbor Surf forecast
The above surf forecast table for Green Harbor provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Green Harbor can be found by selecting the local surf guide option on the grey menu. Our Green Harbor surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Green Harbor) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Green Harbor may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Green Harbor is 5 km (3 miles) from Duxbury. If you plan a vacation in Massachusetts, look for hotels and other accommodation in Duxbury. Duxbury has rooms for a wide range of budgets as well as car hire and transport links.
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