Green Harbor surfForecast / Massachusetts / USA

information circle48hr Weather and Surf, issued 1 am Thursday 21 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
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) & DateWave HeightWave 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 Forecast

Mostly 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
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
Wave
Height (m)
Direction
Period (s)
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.8
NE
5
0.7
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
0.5
NE
4
0.4
NE
4
0.4
NE
4
0.1
E
13
0.1
E
13
0.1
E
14
0.1
E
13
0.1
E
13
0.1
E
10
0.1
E
10
0.1
E
12
Wave Graph
Metric surfscale
Energy kJ
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)
15
NNW
20
N
20
NE
15
ENE
15
E
10
ESE
10
SSE
10
SW
10
NW
20
NE
20
NE
20
NE
15
ENE
10
ESE
15
SE
10
SSE
5
SW
5
NNE
10
ENE
15
E
15
E
15
E
15
ESE
15
ESE
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
cloud
cloud
cloud
cloud
cloud
cloud
cloud
cloud
part cloud
part cloud
clear
clear
part cloud
part cloud
clear
part cloud
cloud
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>
8:01
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)
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.8
NE
5
0.7
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
0.5
NE
4
0.4
NE
4
0.4
NE
4
0.2
ENE
4
0.2
ENE
4
0.1
E
10
0.1
E
10
0.1
E
10
0.1
E
10
0.1
E
10
0.1
E
10
Energy 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)
0.1
E
14
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
0.2
E
4
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
14
0.1
E
13
0.1
E
13
0.1
E
10
0.1
E
12
Energy 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)
0.1
E
12
0.1
SE
6
0.1
E
15
0.1
E
15
0.1
E
15
0.1
E
15
0.1
S
6
0.1
SE
9
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
10
Energy 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)
0.4
NW
4
0.4
N
3
0.5
NNE
3
0.7
NE
4
0.4
NE
5
0.6
NE
3
0.6
NE
4
0.6
NE
4
0.2
ENE
2
0.2
ESE
2
0.2
ESE
2
Energy kJ
3
3
6
19
7
7
9
10
1
1
1
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
1
1
1
1
1
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
Rating
(10 max)
Best forecast wave conditions in United States
Rating
(10 max)
1
3
3
3
3
1
1
2
2
2
2
2
3
1
1
2
2
2
2
2
1
1
2
2
Header Global
Rating
(10 max)
5
5
5
5
5
5
4
5
7
7
7
6
5
7
5
7
7
8
8
7
6
7
5
5
  • 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

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