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Green Harbor Surf Forecast
/ Massachusetts (29 breaks) / Massachusetts (28 breaks) /
Surf Forecasts:
Green Harbor surfForecast / Massachusetts / USA
48hr Weather and Surf, issued 1 am Thursday 21 May 2026 EDTForecast 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
12.5° C
(Which is 2.2°C warmer than normal for this time of year)How big are the waves at Green Harbor today?
The current surf forecast for Green Harbor at 7AM is: 0.2m 9s primary swell from a East-southeast direction and 0.1m 14s secondary swell from a East direction (forecast issued at 01:00am May 21). An open ocean swell of 0.5m 3s is not directed at the surf break. The wind direction is predicted to be offshore.
| Time (EDT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 May) | 0.5ft (0.2m) | 9s |
| Afternoon (21 May) | 2.5ft (0.8m) | 5s |
| Evening (21 May) | 2ft (0.6m) | 5s |
Table - waves today at Green Harbor. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastMostly dry. Very mild (max 13°C on Thu morning, min 11°C on Thu morning). Wind will be generally light. | ||||||||||||||||||||||||
Thursday 21 | Friday 22 | Saturday 23 | ||||||||||||||||||||||
2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | |
Swell Height Map |    |    |    | |||||||||||||||||||||
ESE 9 | ESE 9 | ESE 9 | ESE 9 | NE 5 | NE 5 | NE 5 | NE 5 | NE 4 | E 14 | E 11 | E 13 | E 13 | NE 4 | NE 4 | NE 4 | E 13 | E 13 | E 14 | E 13 | E 13 | E 10 | E 10 | E 12 | |
8 | 8 | 8 | 8 | 34 | 25 | 21 | 11 | 5 | 4 | 3 | 3 | 3 | 7 | 4 | 3 | 4 | 4 | 4 | 3 | 3 | 2 | 2 | 3 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-off | cross-off | off | off | cross-off | cross-off | cross-on | on | cross | off | off | off | off | cross-off | cross | cross-on | on | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | |
High Tide | 3:19AM3.38m | 4:01PM2.88m | 4:19AM3.24m | 5:02PM2.85m | 5:21AM3.09m | 6:04PM2.85m | ||||||||||||||||||
Low Tide | 9:45AM-0.26m | 10:00PM0.14m | 10:43AM-0.14m | 11:03PM0.20m | 11:42AM-0.02m | |||||||||||||||||||
 | |  | | | | | |  | |  | |  | | | | | | | | | | | | |
 | — | 5:16 | — | — | — | — | — | — | — | 5:15 | — | — | — | — | — | — | — | 5:15 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 8:01 | — | — | — | — | — | — | — | 8:01 | — | — | — | — | — | — | — | 8:02 | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 20 | 18 | 13 | 11 | 11 | 11 | 12 | 13 | 12 | 11 | 11 | 11 | 11 | 12 | 12 | 12 | 11 | 11 | 12 | 13 | 13 | 12 | 11 | 12 |
17 | 14 | 9 | 7 | 7 | 8 | 8 | 10 | 10 | 6 | 6 | 6 | 7 | 8 | 7 | 7 | 8 | 8 | 9 | 8 | 8 | 8 | 7 | 8 | |
Swell 1 Height (m) Direction Period (s) | ESE 9 | ESE 9 | ESE 9 | ESE 9 | NE 5 | NE 5 | NE 5 | NE 5 | NE 4 | SE 9 | SE 9 | E 10 | E 10 | NE 4 | NE 4 | NE 4 | ENE 4 | ENE 4 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 |
 kJ | 8 | 8 | 8 | 8 | 34 | 25 | 21 | 11 | 5 | 3 | 3 | 2 | 2 | 7 | 4 | 3 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 |
Swell 2 Height (m) Direction Period (s) | E 14 | E 14 | E 14 | E 14 | E 9 | E 9 | E 9 | E 9 | E 4 | E 11 | E 11 | E 13 | E 13 | E 10 | E 10 | E 10 | E 10 | E 10 | E 14 | E 13 | E 13 | E 10 | — | E 12 |
| kJ | 4 | 4 | 4 | 4 | 7 | 7 | 7 | 7 | 1 | 2 | 2 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 4 | 3 | 3 | 2 | — | 3 |
Swell 3 Height (m) Direction Period (s) | — | E 12 | SE 6 | E 15 | E 15 | E 15 | E 15 | S 6 | SE 9 | E 14 | — | E 13 | E 13 | E 13 | E 13 | E 13 | E 13 | E 13 | E 13 | E 13 | — | — | E 10 | — |
| kJ | — | 3 | 1 | 4 | 4 | 4 | 4 | 1 | 3 | 4 | — | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 3 | — | — | 2 | — |
Wind waves Height (m) Direction Period (s) | NW 4 | N 3 | NNE 3 | NE 4 | — | — | — | — | — | NE 5 | NE 3 | NE 4 | NE 4 | — | — | — | — | — | — | ENE 2 | — | — | ESE 2 | ESE 2 |
| kJ | 3 | 3 | 6 | 19 | — | — | — | — | — | 7 | 7 | 9 | 10 | — | — | — | — | — | — | 1 | — | — | 1 | 1 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 85 | 102 | 109 | 106 | 106 | 275 | 524 | 647 | 275 | 649 | 649 | 802 | 818 | 810 | 822 | 822 | 718 | 718 | 832 | 834 | 718 | 528 | 1198 | 501 |
Best forecast wave conditions in Massachusetts | ||||||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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Live Wind Speed (km/h)
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Ocean Swells (m)- Wind Speed (km/h)
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