Nantasket Beach Surf Break

Lat Long: 42.31° N 70.88° W

Nantasket Beach 48 hour detailed Surf Forecast

Issued: 7 pm 21 Aug 2026 (local time)

Forecast update in  hr  min

Today's Nantasket Beach sea temperature is
20.9°C
0.7° 

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


How big are the waves at Nantasket Beach today (22 Aug):

  • Morning surf: Morning surf (22 Aug, local time) - 2.5ft (0.8m), 5s period with E swell.
  • Afternoon surf: Afternoon surf (22 Aug, local time) - 3.5ft (1.0m), 6s period with E swell.
  • Evening surf: Evening surf (22 Aug, local time) - 2.5ft (0.8m), 6s period with E swell.

The current surf forecast for Nantasket Beach at 3AM is: 0.4m 8s primary swell from a East direction and 0.2m 4s secondary swell from a East-southeast direction, 0.4m 4s secondary swell from a East-northeast direction (forecast issued at 07:00pm August 21). The wind direction is predicted to be cross-onshore.

Time (EDT) & DateWave HeightWave Period
Morning (22 Aug)2.5ft (0.8m)5s
Afternoon (22 Aug)3.5ft (1.0m)6s
Evening (22 Aug)2.5ft (0.8m)6s

Table - waves today at Nantasket Beach. (Swell directed towards the surf break)


Short Range Forecast

Light rain (total 8mm), mostly falling on Sat morning. Warm (max 27°C on Mon afternoon, min 17°C on Sat morning). Wind will be generally light.

Fri
21
Saturday
22
Sunday
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
Rating
(10 max)
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
Wave
Height (m)
Direction
Period (s)
0.3
E
8
0.6
ENE
4
0.4
E
8
0.4
E
8
0.3
E
8
0.7
E
5
0.9
E
5
1
E
6
0.9
E
6
0.8
E
6
0.7
E
6
0.6
ENE
5
0.6
ENE
5
0.5
ENE
5
0.5
E
5
0.5
E
6
0.5
E
6
0.2
E
12
0.3
ENE
6
Wave Graph
Metric surfscale
Energy kJ
12
12
20
20
13
22
43
66
53
41
29
21
20
14
14
16
17
11
6
Wind (km/h)
15
NE
10
ENE
10
ENE
10
NE
15
NE
20
NE
20
NNE
20
NNE
15
N
15
NNW
10
NW
5
NNW
5
NNE
5
ENE
10
E
5
ESE
0
NW
5
ESE
10
S
Wind State
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross
cross-off
cross-off
cross-off
glassy
cross-on
on
on
glassy
glassy
cross-off
High Tide
6:52PM2.64m
7:41AM2.26m
7:49PM2.62m
8:40AM2.27m
8:46PM2.66m
Low Tide
1:27AM0.45m
1:31PM0.69m
2:27AM0.45m
2:28PM0.67m
cloud
part cloud
cloud
cloud
part cloud
cloud
light rain
light rain
light rain
cloud
part cloud
part cloud
cloud
part cloud
light rain
cloud
thunderstorm
part cloud
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:56
5:58
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:36
7:34
7:32
 mm
2
2
1
1
1
1
Temp °C
19
19
19
19
19
19
17
17
17
17
17
17
17
18
19
22
25
23
21
Feels °C
18
19
19
19
18
18
15
16
16
17
18
18
19
19
20
24
28
26
23
  • 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 Nantasket Beach 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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