Green Harbor surfForecast / Massachusetts / USA

information circle48hr Weather and Surf, issued 7 pm Wednesday 20 May 2026 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
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) & DateWave HeightWave 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 Forecast

Some 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
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
0.2
ESE
10
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.6
NE
4
0.6
NE
5
0.6
NE
5
0.5
NE
5
0.4
NE
4
0.1
E
14
0.1
E
11
0.1
E
13
0.1
E
13
0.4
NE
4
0.4
NE
4
0.1
E
13
0.1
E
13
0.1
E
13
0.1
E
13
0.1
E
13
0.1
E
14
Wave Graph
Metric surfscale
Energy kJ
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)
20
WNW
20
W
15
W
15
NNW
10
NNE
15
NNE
15
ENE
15
ESE
10
ESE
15
SSE
10
WSW
5
NW
15
NE
20
NE
15
ENE
15
ENE
10
ESE
15
SE
10
S
5
WSW
5
NNW
5
NE
5
ENE
15
E
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
clear
rain showers
cloud
cloud
cloud
cloud
cloud
cloud
cloud
cloud
cloud
clear
part cloud
clear
part cloud
clear
clear
part cloud
cloud
cloud
cloud
cloud
cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:16
5:15
5:15
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
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)
0.2
ESE
10
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.6
NE
4
0.6
NE
5
0.6
NE
5
0.5
NE
5
0.4
NE
4
0.1
SE
9
0.1
SE
9
0.1
E
10
0.1
E
10
0.4
NE
4
0.4
NE
4
0.2
ENE
4
0.2
ENE
3
0.2
ENE
3
0.1
E
10
0.1
E
10
0.1
E
10
Energy 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)
0.1
E
12
0.1
E
12
0.1
E
12
0.1
E
14
0.1
E
14
0.1
E
14
0.2
E
9
0.2
E
9
0.2
E
9
0.2
E
9
0.1
SE
9
0.1
E
11
0.1
E
11
0.1
E
13
0.1
E
13
0.1
E
10
0.1
E
10
0.1
E
10
0.1
E
10
0.1
E
10
0.1
E
13
Energy 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)
0.1
E
12
0.1
E
15
0.1
E
14
0.2
SSE
6
0.1
E
14
0.1
E
15
0.1
E
15
0.2
S
6
0.1
E
11
0.1
E
14
0.1
E
13
0.1
E
13
0.1
E
13
0.1
E
13
0.1
E
13
0.1
E
13
0.1
E
13
0.1
E
13
0.1
E
13
0.1
E
14
Energy 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)
0.4
NW
4
0.4
NW
4
0.3
NNW
3
0.4
NNE
3
0.5
NE
4
0.3
NE
4
0.4
NE
3
0.4
NE
4
0.4
NE
4
Energy kJ
3
3
2
4
8
3
4
4
4
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
1
1
1
1
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
Rating
(10 max)
1
1
1
Best forecast wave conditions in United States
Rating
(10 max)
1
2
1
1
3
3
2
3
1
2
1
2
2
2
2
2
1
1
2
2
2
2
2
1
Header Global
Rating
(10 max)
5
5
5
5
5
5
4
5
4
4
5
7
8
7
6
5
5
6
7
7
8
8
7
6
  • 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

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.


Nearest locationNearest
Nearest locationNearest
Nearest locationNearest