Nantasket Beach Surf Break

Lat Long: 42.31° N 70.88° W

Issued: 7 pm 21 Jun 2026 (local time)

Forecast update in  hr  min

Today's Nantasket Beach sea temperature is
15.9° C

Normal for this time of year

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 (21 Jun):

  • Afternoon surf: Afternoon surf (21 Jun, local time) - 0.5ft (0.1m), 12s period with E swell.
  • Evening surf: Evening surf (21 Jun, local time) - 0.5ft (0.1m), 12s period with E swell.

The current surf forecast for Nantasket Beach at 11PM is: 0.1m 12s primary swell from a East direction (forecast issued at 07:00pm June 21). The wind direction is predicted to be offshore.

Time (EDT) & DateWave HeightWave Period
Morning (21 Jun)--
Afternoon (21 Jun)0.5ft (0.1m)12s
Evening (21 Jun)0.5ft (0.1m)12s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Heavy rain (total 57mm), heaviest during Tue morning. Warm (max 27°C on Wed afternoon, min 16°C on Mon night). Wind will be generally light.

Sun
21
Monday
22
Tuesday
23
Wed
24
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 Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.1
E
12
0.1
E
12
0.1
E
12
0.1
E
12
0.1
E
12
0.1
E
12
0.1
E
11
0.1
E
11
0.1
E
11
0.1
E
11
0.1
E
11
0.4
SE
4
0.6
SSE
4
0.4
SE
4
0.3
SE
5
0.4
SE
5
0.1
E
11
0.4
NNE
3
0.4
N
3
0.4
NNE
3
0.2
ESE
5
0.2
ESE
7
0.3
ESE
7
0.3
ESE
7
Wave Graph
Metric surfscale
Energy kJ
3
3
3
3
3
3
2
2
2
2
2
5
10
4
4
6
2
3
4
4
2
5
9
9
Wind (km/h)
10
N
5
SSW
10
W
10
WNW
10
WSW
5
W
5
SW
10
WSW
5
NE
10
E
10
ESE
10
S
10
SSW
10
S
5
S
25
N
15
NNW
10
NNW
5
WNW
10
W
10
WNW
15
WNW
15
NW
10
WNW
Wind State
cross
glassy
off
off
off
off
cross-off
cross-off
glassy
on
cross-on
cross
cross-off
cross
cross
cross
cross-off
cross-off
cross-off
off
off
cross-off
cross-off
cross-off
High Tide
5:35PM2.87m
5:57AM2.74m
6:30PM2.85m
6:57AM2.61m
7:23PM2.83m
7:58AM2.51m
Low Tide
11:44PM0.28m
12:09PM0.20m
00:46AM0.30m
1:03PM0.33m
1:46AM0.30m
1:56PM0.44m
clear
clear
clear
clear
clear
part cloud
cloud
cloud
cloud
light rain
light rain
cloud
light rain
heavy rain
heavy rain
heavy rain
light rain
rain showers
clear
clear
part cloud
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:07
5:07
5:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:22
8:22
8:22
8:23
 mm
4
3
2
13
18
13
3
1
Temp °C
23
23
21
19
19
20
24
25
19
16
17
18
19
19
19
16
16
16
17
16
16
17
23
26
Feels °C
21
22
20
18
18
19
23
23
19
16
17
19
20
20
21
13
15
15
18
15
15
15
20
23
Swell 1
Height (m)
Direction
Period (s)
0.1
E
9
0.1
E
8
0.1
E
12
0.1
E
12
0.1
S
7
0.1
E
12
0.1
E
11
0.1
E
11
0.1
E
11
0.1
E
11
0.1
E
11
0.1
E
11
0.4
SE
4
0.4
SE
5
0.2
ESE
5
0.2
ESE
5
0.3
NNE
3
0.2
NNE
3
0.2
ESE
5
0.2
NNE
4
0.3
ESE
7
0.3
ESE
7
Energy kJ
1
1
3
3
1
3
2
2
2
2
2
2
5
6
2
2
2
1
2
1
9
9
Swell 2
Height (m)
Direction
Period (s)
0.1
E
12
0.1
E
12
0.1
E
12
0.1
E
11
0.1
E
11
0.1
E
11
0.1
E
8
0.1
E
7
0.1
E
7
0.2
ESE
5
0.2
ESE
5
0.2
NNE
3
0.2
ESE
5
0.2
NNE
4
0.2
NNE
4
Energy kJ
3
3
3
2
2
2
1
1
1
2
2
1
2
1
1
Swell 3
Height (m)
Direction
Period (s)
0.1
E
12
0.1
E
12
0.1
E
11
0.1
E
7
0.1
E
11
0.1
E
11
0.1
E
7
0.1
E
8
0.1
SE
7
0.2
ESE
7
0.1
E
9
0.1
E
9
Energy kJ
3
3
2
1
2
2
1
1
2
5
2
2
Wind waves
Height (m)
Direction
Period (s)
0.3
SE
2
0.4
SE
4
0.6
SSE
4
0.4
SE
4
0.3
SE
5
0.4
NNE
3
0.4
N
3
0.4
NNE
3
0.3
N
3
0.3
NW
2
Energy kJ
1
5
10
4
4
3
4
4
2
1
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
Distance (km)
228
523
98
118
118
660
3302
1838
1838
349
1083
2508
108
67
109
91
90
98
113
117
87
87
108
58
Best forecast wave conditions in Massachusetts
Rating
(10 max)
1
1
1
1
Best forecast wave conditions in United States
Rating
(10 max)
1
2
3
3
3
3
2
2
2
2
2
2
3
3
3
1
1
1
2
3
3
3
3
1
Header Global
Rating
(10 max)
7
6
6
5
7
6
6
5
5
5
5
5
5
5
5
6
7
8
9
7
8
7
8
7
  • 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 

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