Plum Island surf break

Plum Island surfForecast / Massachusetts / USA

information circle48hr Weather and Surf, issued 1 pm Thursday 21 May 2026 EDT
Forecast update in hr  min  s Forecast update imminent
Plum Island surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Plum Island sea temperature is
11.1° C
(Which is 1.2°C warmer than normal for this time of year)

How big are the waves at Plum Island today?

The current surf forecast for Plum Island at 8PM is: 0.3m 9s primary swell from a Southeast direction and 0.4m 4s secondary swell from a Northeast direction (forecast issued at 01:00pm May 21). The wind direction is predicted to be glassy.

Time (EDT) & DateWave HeightWave Period
Morning (21 May)1.5ft (0.4m)9s
Afternoon (21 May)2ft (0.6m)5s
Evening (21 May)1ft (0.3m)9s

Table - waves today at Plum Island. (Swell directed towards the surf break)


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Mostly dry. Very mild (max 15°C on Thu afternoon, min 11°C on Thu night). Wind will be generally light.

Thu
21
Friday
22
Saturday
23
Sun
24
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
2 AM
5 AM
8 AM
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)
0.4
SE
9
0.6
NE
5
0.3
SE
9
0.3
SE
9
0.3
SE
9
0.3
SE
9
0.3
SE
9
0.3
SE
9
0.3
SE
9
0.3
SE
9
0.3
SE
10
0.3
SE
10
0.3
SE
10
0.3
SE
10
0.3
SE
10
0.3
SE
10
0.3
SE
10
0.3
SE
10
0.3
SE
10
0.3
SE
10
0.3
SE
9
0.3
SE
9
0.2
SSE
7
0.3
SE
7
Wave Graph
Metric surfscale
Energy kJ
28
20
12
12
12
13
13
13
13
14
15
15
15
15
15
15
15
14
14
14
14
14
5
8
Wind (km/h)
10
ENE
10
ESE
5
ESE
5
S
5
NW
20
NNE
15
NNE
10
NNE
10
E
15
ESE
20
SSE
15
S
10
SSW
5
W
5
NNW
5
N
10
ENE
10
ESE
10
SSE
10
SSE
10
SSE
5
SSE
5
SE
15
ESE
on
on
glassy
glassy
glassy
cross-on
cross
cross-on
on
on
cross-on
cross
cross-off
glassy
glassy
glassy
cross-on
cross-on
cross
cross-on
cross
cross-on
glassy
cross-on
High Tide
4:21PM2.42m
4:37AM2.73m
5:24PM2.38m
5:40AM2.57m
6:29PM2.36m
6:48AM2.43m
Low Tide
10:41AM-0.17m
10:58PM0.24m
11:43AM-0.06m
00:05AM0.28m
12:44PM0.03m
1:12AM0.28m
part cloud
part cloud
cloud
cloud
cloud
part cloud
clear
clear
clear
clear
part cloud
cloud
part cloud
part cloud
cloud
cloud
cloud
cloud
cloud
cloud
cloud
cloud
cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:13
5:13
5:11
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:04
8:05
8:06
8:07
Temp °C
14
15
15
15
14
11
11
11
12
13
12
13
14
13
13
13
14
14
13
13
13
12
11
11
11
12
12
12
12
6
6
7
7
8
6
8
10
10
10
10
10
10
9
9
9
9
9
7
Swell 1
Height (m)
Direction
Period (s)
0.4
SE
9
0.6
NE
5
0.5
NE
5
0.4
NE
4
0.3
SE
9
0.3
SE
9
0.3
SE
9
0.3
SE
9
0.3
SE
9
0.3
SE
9
0.3
SE
10
0.3
SE
10
0.3
SE
10
0.3
SSE
3
0.3
SE
10
0.3
SE
10
0.3
SE
10
0.3
SE
10
0.3
SE
10
0.3
SE
10
0.3
SE
9
0.3
SE
9
0.2
SSE
7
0.3
SE
7
Energy kJ
28
20
12
5
12
13
13
13
13
14
15
15
15
2
15
15
15
14
14
14
14
14
5
8
Swell 2
Height (m)
Direction
Period (s)
0.1
E
14
0.3
SE
9
0.3
SE
9
0.3
SE
9
0.2
ENE
4
0.1
SE
6
0.1
SE
5
0.1
SE
5
0.1
S
5
0.1
E
13
0.3
NE
4
0.3
SE
10
0.2
SSE
3
0.1
E
13
0.1
E
12
0.1
SE
9
0.1
SE
9
Energy kJ
4
12
12
12
1
1
1
1
1
3
2
15
1
3
3
3
3
Swell 3
Height (m)
Direction
Period (s)
0.1
E
15
0.1
E
14
0.1
SE
6
0.1
SE
6
0.1
SE
6
0.1
SE
13
0.1
E
13
0.1
E
13
0.1
SE
13
0.1
SE
13
0.1
SE
13
0.1
SE
13
0.1
SE
13
0.1
E
13
0.1
E
13
0.1
E
13
0.1
E
13
0.1
E
13
0.1
SE
12
0.1
E
12
0.1
E
12
Energy kJ
4
4
1
1
1
7
3
3
7
7
7
7
7
4
4
4
3
3
6
3
3
Wind waves
Height (m)
Direction
Period (s)
0.6
NE
4
0.1
SE
6
0.2
ENE
4
0.5
NE
3
0.6
NE
4
0.5
NE
4
0.4
NE
4
0.3
SSE
2
0.4
SSE
3
0.2
ESE
2
0.2
ESE
2
0.2
ESE
2
Energy kJ
16
1
1
4
8
7
5
1
3
1
1
1
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
1
1
2
1
1
1
1
2
2
1
1
1
1
1
1
3
4
Distance (km)
14
170
319
239
316
324
627
627
895
935
2736
2736
941
833
800
772
772
1276
1276
182
169
772
665
550
Best forecast wave conditions in Massachusetts
Rating
(10 max)
Best forecast wave conditions in United States
Rating
(10 max)
1
2
1
1
1
2
2
2
2
2
1
1
2
3
3
2
2
1
1
1
2
2
3
4
Header Global
Rating
(10 max)
5
5
5
4
5
7
7
7
6
6
6
5
6
7
8
8
7
6
5
5
5
5
6
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

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