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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 7 pm Wednesday 20 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
11.3° C
(Which is 1.1°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 2AM is: 0.2m 9s primary swell from a East-southeast direction and 0.1m 14s secondary swell from a East direction (forecast issued at 07:00pm May 20). An open ocean swell of 0.3m 3s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (EDT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 May) | 0.5ft (0.2m) | 9s |
| Afternoon (21 May) | 2ft (0.6m) | 4s |
| Evening (21 May) | 1.5ft (0.5m) | 5s |
Table - waves today at Green Harbor. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastSome drizzle, heaviest during Wed night. Warm (max 25°C on Wed night, min 11°C on Thu morning). Wind will be generally light. | ||||||||||||||||||||||||
Wed 20 | Thursday 21 | Friday 22 | Sat 23 | |||||||||||||||||||||
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 | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
ESE 10 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | NE 4 | NE 5 | NE 5 | NE 5 | NE 4 | E 14 | E 11 | E 13 | E 13 | NE 4 | NE 4 | E 13 | E 13 | E 13 | E 13 | E 13 | E 14 | |
9 | 9 | 9 | 8 | 8 | 8 | 8 | 12 | 19 | 21 | 11 | 5 | 4 | 3 | 3 | 3 | 4 | 3 | 3 | 4 | 4 | 4 | 3 | 4 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-on | cross-on | cross-on | cross-off | off | off | cross-off | cross-off | cross-off | cross-on | on | cross | off | off | off | cross-off | cross-off | cross | cross-on | on | glassy | off | cross-off | cross-off | |
High Tide | 3:04PM2.91m | 3:19AM3.38m | 4:01PM2.88m | 4:19AM3.24m | 5:02PM2.85m | 5:21AM3.09m | ||||||||||||||||||
Low Tide | 9:01PM0.08m | 9:45AM-0.26m | 10:00PM0.14m | 10:43AM-0.14m | 11:03PM0.20m | 11:42AM-0.02m | ||||||||||||||||||
 |  |  | | |  | | | | | |  |  | |  | | | | | | | | | | |
 | — | — | — | — | 5:16 | — | — | — | — | — | — | — | 5:15 | — | — | — | — | — | — | — | 5:15 | — | — | — |
 | — | 8:00 | — | — | — | — | — | — | — | 8:01 | — | — | — | — | — | — | — | 8:01 | — | — | — | — | — | 8:02 |
— | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 30 | 25 | 22 | 19 | 17 | 14 | 11 | 11 | 11 | 12 | 12 | 12 | 11 | 11 | 11 | 12 | 12 | 13 | 12 | 12 | 12 | 13 | 14 | 14 |
29 | 23 | 20 | 16 | 14 | 10 | 7 | 7 | 8 | 8 | 9 | 10 | 7 | 5 | 6 | 8 | 8 | 8 | 7 | 8 | 9 | 9 | 10 | 9 | |
Swell 1 Height (m) Direction Period (s) | ESE 10 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | ESE 9 | NE 4 | NE 5 | NE 5 | NE 5 | NE 4 | SE 9 | SE 9 | E 10 | E 10 | NE 4 | NE 4 | ENE 4 | ENE 3 | ENE 3 | E 10 | E 10 | E 10 |
 kJ | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 12 | 19 | 21 | 11 | 5 | 3 | 3 | 2 | 2 | 4 | 3 | 1 | 1 | 1 | 2 | 2 | 2 |
Swell 2 Height (m) Direction Period (s) | E 12 | E 12 | E 12 | E 14 | — | E 14 | E 14 | E 9 | E 9 | E 9 | E 9 | SE 9 | E 11 | E 11 | E 13 | E 13 | E 10 | E 10 | E 10 | E 10 | E 10 | — | — | E 13 |
| kJ | 3 | 3 | 3 | 4 | — | 4 | 4 | 7 | 7 | 7 | 7 | 3 | 2 | 2 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | — | — | 3 |
Swell 3 Height (m) Direction Period (s) | E 12 | — | E 15 | — | E 14 | SSE 6 | E 14 | E 15 | E 15 | — | S 6 | E 11 | E 14 | — | E 13 | E 13 | E 13 | E 13 | E 13 | E 13 | E 13 | E 13 | E 13 | E 14 |
| kJ | 3 | — | 4 | — | 4 | 3 | 4 | 4 | 4 | — | 3 | 2 | 4 | — | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 3 | 4 |
Wind waves Height (m) Direction Period (s) | — | NW 4 | NW 4 | NNW 3 | — | NNE 3 | NE 4 | — | — | — | — | — | NE 4 | NE 3 | NE 4 | NE 4 | — | — | — | — | — | — | — | — |
| kJ | — | 3 | 3 | 2 | — | 4 | 8 | — | — | — | — | — | 3 | 4 | 4 | 4 | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 131 | 57 | 57 | 102 | 96 | 106 | 109 | 106 | 276 | 647 | 276 | 275 | 649 | 656 | 810 | 807 | 810 | 832 | 832 | 832 | 184 | 807 | 858 | 858 |
Best forecast wave conditions in Massachusetts | ||||||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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