Nantasket Beach surf break

Nantasket Beach surfForecast / Massachusetts / USA

information circle48hr Weather and Surf, issued 1 pm Monday 18 May 2026 EDT
Forecast update in hr  min  s Forecast update imminent
Nantasket Beach surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Nantasket Beach sea temperature is
10.8° C
(Which is 1.0°C warmer than normal for this time of year)

How big are the waves at Nantasket Beach today?

The current surf forecast for Nantasket Beach at 5PM is: 0.2m 8s primary swell from a East-southeast direction and 0.1m 4s secondary swell from a Northeast direction, 0.4m 4s secondary swell from a East-southeast direction (forecast issued at 01:00pm May 18). The wind direction is predicted to be cross-shore.

Time (EDT) & DateWave HeightWave Period
Morning (18 May)0.5ft (0.2m)8s
Afternoon (18 May)0.5ft (0.2m)8s
Evening (18 May)1.5ft (0.5m)4s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Light rain (total 2mm), mostly falling on Tue night. Warm (max 34°C on Tue afternoon, min 11°C on Thu morning). Wind will be generally light.

Mon
18
Tuesday
19
Wednesday
20
Thu
21
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)
0.2
ESE
8
0.2
ESE
8
0.2
ESE
8
0.5
SE
4
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
10
0.2
ESE
9
0.6
S
5
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
Wave Graph
Metric surfscale
Energy kJ
6
6
6
6
8
8
8
8
7
9
9
15
8
8
8
8
8
8
8
8
8
8
8
8
Wind (km/h)
15
ESE
20
SE
20
SSE
15
SSW
15
SW
15
SW
15
SW
20
SW
20
SW
20
WSW
20
WSW
15
SSW
15
SW
15
SW
15
SW
20
WSW
20
W
25
WNW
25
WNW
20
WNW
20
WNW
20
NNW
20
NNW
20
NNW
on
cross-on
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
off
cross-off
cross-off
cross-off
cross-off
cross-off
off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
High Tide
1:08PM3.00m
1:17AM3.48m
2:03PM2.96m
2:13AM3.39m
2:59PM2.89m
3:10AM3.25m
Low Tide
7:03PM-0.02m
7:47AM-0.42m
7:58PM0.05m
8:42AM-0.32m
8:55PM0.13m
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
cloud
thunderstorm
clear
clear
clear
clear
clear
part cloud
rain showers
part cloud
clear
clear
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:18
5:16
5:16
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:00
8:00
8:01
8:02
1
1
Temp °C
19
21
24
23
21
21
21
23
30
34
33
26
24
23
23
25
31
32
29
23
19
15
12
11
15
17
22
21
20
20
20
22
28
31
31
26
23
23
22
24
29
29
26
20
15
10
7
5
Swell 1
Height (m)
Direction
Period (s)
0.2
ESE
8
0.2
ESE
8
0.2
ESE
8
0.2
ESE
8
0.4
SE
4
0.3
SE
4
0.1
SE
4
0.2
ESE
9
0.2
ESE
9
0.2
ESE
10
0.2
ESE
9
0.2
ESE
9
0.4
SSE
4
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
Energy kJ
6
6
6
6
5
3
1
8
7
9
9
8
7
8
8
8
8
8
8
8
8
8
8
8
Swell 2
Height (m)
Direction
Period (s)
0.1
NE
4
0.1
NE
4
0.2
ESE
9
0.2
ESE
9
0.2
ESE
9
0.1
SE
4
0.1
SE
4
0.1
SE
6
0.1
E
16
0.2
ESE
9
0.1
SE
4
0.1
SE
4
0.1
E
12
0.1
E
12
0.1
E
12
0.1
S
5
0.1
SE
5
0.1
SE
5
0.1
E
14
0.1
E
14
0.1
E
15
Energy kJ
1
1
8
8
8
1
1
1
5
8
1
1
3
3
3
1
1
1
4
4
4
Swell 3
Height (m)
Direction
Period (s)
0.1
E
13
0.1
NE
4
0.1
NE
4
0.1
E
13
0.1
E
13
0.1
S
5
0.1
E
16
0.1
E
16
0.1
E
12
0.1
E
12
0.1
E
12
0.1
E
12
0.1
E
12
Energy kJ
4
1
1
3
3
1
5
5
3
3
3
3
3
Wind waves
Height (m)
Direction
Period (s)
0.4
ENE
3
0.5
E
3
0.4
ESE
4
0.5
SE
4
0.2
SSW
2
0.3
SW
2
0.3
SW
2
0.3
SW
2
0.3
SSW
2
0.3
SW
2
0.4
SSW
4
0.6
S
5
0.3
SW
3
0.3
SW
2
0.3
SW
2
0.4
SW
2
0.3
WSW
2
0.3
W
2
0.5
WNW
3
0.4
WNW
3
0.4
NW
3
0.4
NW
3
0.6
N
3
0.6
N
4
Energy kJ
4
6
5
6
1
1
1
1
1
1
6
15
1
1
1
2
1
1
5
5
2
2
8
10
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
1
1
1
1
1
1
1
Distance (km)
117
523
523
131
64
64
64
72
332
64
64
12
55
55
55
336
336
131
108
100
117
133
98
118
Best forecast wave conditions in Massachusetts
Rating
(10 max)
2
1
1
1
Best forecast wave conditions in United States
Rating
(10 max)
3
2
1
1
3
4
4
4
1
1
2
2
2
2
2
2
2
1
2
2
1
3
3
Header Global
Rating
(10 max)
5
5
4
4
4
4
4
4
5
4
5
5
5
4
5
5
4
5
5
4
4
5
5
4
  • 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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