Plum Island Surf Break

Lat Long: 42.80° N 70.81° W

Plum Island 48 hour detailed Surf Forecast

Issued: 1 am 21 Sep 2026 (local time)

Forecast update in  hr  min

Today's Plum Island sea temperature is
17.1°C
0.5° 

Plum Island surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


How big are the waves at Plum Island today (21 Sep):

  • Morning surf: Morning surf (21 Sep, local time) - 2.5ft (0.8m), 4s period with NNE swell.
  • Afternoon surf: Afternoon surf (21 Sep, local time) - 2.5ft (0.8m), 4s period with NE swell.
  • Evening surf: Evening surf (21 Sep, local time) - 1.5ft (0.4m), 9s period with SE swell.

The current surf forecast for Plum Island at 5AM is: 0.4m 8s primary swell from a East-southeast direction and 0.4m 4s secondary swell from a Southeast direction, 0.4m 3s secondary swell from a North-northeast direction (forecast issued at 01:00am September 21). The wind direction is predicted to be cross-shore.

Time (EDT) & DateWave HeightWave Period
Morning (21 Sep)2.5ft (0.8m)4s
Afternoon (21 Sep)2.5ft (0.8m)4s
Evening (21 Sep)1.5ft (0.4m)9s

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


Short Range Forecast

Mostly dry. Very mild (max 16°C on Mon afternoon, min 11°C on Wed night). Winds increasing (light winds from the ESE on Mon night, fresh winds from the NE by Wed morning).

Monday
21
Tuesday
22
Wednesday
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 Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.6
SE
4
0.4
ESE
8
0.8
NNE
4
0.8
NE
4
0.4
SE
8
0.9
ENE
5
0.4
SE
9
0.7
E
5
1
ENE
4
1.3
ENE
5
1.4
ENE
6
1.5
ENE
6
1.5
ENE
6
1.4
ENE
6
1.1
ENE
6
1
ENE
6
1.4
E
7
1.6
E
6
1.7
E
7
1.9
E
7
2.1
E
7
2.2
E
8
2.2
E
8
2.2
ESE
9
Wave Graph
Metric surfscale
Energy kJ
14
27
17
20
21
35
22
26
38
86
119
151
183
153
95
65
168
157
248
337
461
594
682
708
Wind (km/h)
10
N
20
NNE
20
NNE
20
NE
15
ENE
10
ESE
5
ESE
25
NE
20
NE
25
NE
25
NE
25
NE
25
NE
20
ENE
15
ENE
20
ENE
25
NE
25
NE
30
NE
35
NE
30
ENE
25
ENE
20
ENE
20
ENE
Wind State
cross
cross
cross
cross-on
cross-on
on
on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
High Tide
8:18AM1.96m
8:32PM2.26m
9:12AM2.06m
9:25PM2.34m
9:57AM2.18m
10:11PM2.42m
Low Tide
2:55AM0.39m
3:08PM0.58m
3:45AM0.34m
3:57PM0.49m
4:30AM0.27m
4:42PM0.37m
light rain
light rain
cloud
clear
clear
clear
part cloud
part cloud
cloud
cloud
cloud
cloud
part cloud
part cloud
cloud
part cloud
part cloud
clear
part cloud
part cloud
part cloud
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:28
6:28
6:31
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:43
6:40
6:38
 mm
4
1
Temp °C
14
12
12
14
15
16
16
15
13
12
12
12
12
12
13
13
13
12
13
12
12
12
12
13
Feels °C
13
8
9
10
12
14
15
10
8
7
7
6
6
7
9
8
8
7
7
5
6
7
7
9
  • 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
How to use the Wavefinder 

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 Plum Island 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.


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