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Green Harbor surfForecast / Massachusetts / USA

information circle12 Day Weather and Surf, issued 1 pm Sunday 17 Aug 2025 EDT
Forecast update in hr  min  s Forecast update imminent
Green Harbor surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Green Harbor sea temperature is
19.9° C
 (Which is slightly cooler than normal)

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 Monday (Aug 18) at 2PM. The primary swell is predicted to be 1.8m and 7s period with a secondary swell of 0.4m and 11s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Green Harbor in the next 12 days are 1.2m 17s and forecast to arrive on Friday (Aug 22) at 2AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 5s period and expected on Monday (Aug 18) at 2AM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+) 2PM (Mon 18th Aug)6ft (1.8m) 7s
Best Surf 8AM (Thu 21st Aug)3ft (0.9m) 17s
Most Powerful 2AM (Fri 22nd Aug)4ft (1.2m) 17s

Table - best surf conditions forecast for Green Harbor over the next 12 days.

Hourly12 Days
Massachusetts Surf
Print Surf Table
Updates in  hr  min  s Forecast update imminent 

Short Range Forecast Light rain (total 3mm), mostly falling on Sun night. Warm (max 30°C on Sun afternoon, min 15°C on Mon morning). Winds decreasing (fresh winds from the NE on Sun night, calm by Tue night).

Days 3-6 Weather Summary Light rain (total 3mm), mostly falling on Sat morning. Warm (max 25°C on Fri afternoon, min 17°C on Thu night). Winds increasing (light winds from the W on Fri morning, fresh winds from the SSW by Sat morning).

Sun
17
Monday
18
Tuesday
19
Wednesday
20
Thursday
21
Friday
22
Saturday
23
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
0
0
0
0
1
0
1
0
1
0
1
2
2
2
0
0
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.3
E
0.2
E
2
NE
1.6
NE
0.9
ENE
0.7
ENE
0.6
ENE
0.4
ESE
0.5
E
0.6
E
0.8
ESE
0.9
ESE
1.1
E
1.2
E
0.7
E
1.2
E
0.9
ENE
0.9
ENE
0.8
ENE
0.6
ENE
0.4
ENE
Period(s) (?)6137777915161717171817149121010109
Wave
Graph
(?)Metric surfscale
Energy (?)141939125012482125871572233764937599993953673351691448334
Wind
(km/h)
30
SSW
35
NE
30
NE
15
ENE
5
E
10
ENE
15
ESE
10
S
10
SE
20
ESE
10
ESE
20
ENE
20
NE
15
NW
5
W
20
S
30
SSW
30
SSW
35
SSW
25
SSW
10
SW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		offoffcross-
off		cross-
off		cross-
off		cross-
off		cross-
on		cross-
off		cross-
off		cross-
off		offoffcross-
off		cross-
on		cross-
on		ononononon
High Tide
/ height (m)
6:47PM
3.11
7:31AM
2.58
7:52PM
3.10
8:38AM
2.57
8:57PM
3.12
9:42AM
2.62
9:58PM
3.15
10:39AM
2.69
10:54PM
3.17
11:31AM
2.76
11:44PM
3.16
12:16PM
2.81
12:30AM
3.11
12:58PM
2.84
Low Tide
/ height (m)
1:15AM
0.03
1:28PM
0.32
2:21AM
0.04
2:32PM
0.32
3:25AM
0.01
3:34PM
0.28
4:23AM
-0.02
4:32PM
0.22
5:16AM
-0.05
5:24PM
0.17
6:02AM
-0.05
6:12PM
0.14
6:44AM
-0.01
Sun
17
Monday
18
Tuesday
19
Wednesday
20
Thursday
21
Friday
22
Saturday
23
Sunrise--5:52--5:52--5:54--5:56--5:56--5:58--5:58
Sunset7:39--7:38--7:37--7:36--7:34--7:32--7:30--
part cloudthunderstorm part cloudclearclearpart cloudclearpart cloudcloudclearclearclearclearclearclearclearrain showersthunderstorm mod rainrain showerspart cloud
Rain (mm)
-3--------------1272-
Temp. °C302416151718191918201919191823252123222225
Feels °C (?)29259101415161617171615151522241821202026
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

Eyeball surf reportRecent Eyeball Surf Reports for Massachusetts

  1. weather stationWind Update Wind reports 3 km away suggest it is still onshore at Green Harbor (moderate winds from the SSW at Marshfield Airport). 0.2m 6s windswell from the E to make surfable waves.

    1 hour 19 minutes ago Green Harbor
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1 h 19 min ago

20 km/h
SSW
Onshore
Please reload the page to see if there are any updates.

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.

View detailed surf forecast for Green Harbor at:
surf-forecast.com

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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