Costellos surfForecast / New Hampshire / USA

information circle48hr Weather and Surf, issued 1 am Friday 15 May 2026 EDT
Forecast update in hr  min  s Forecast update imminent
Costellos surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Costellos sea temperature is
9.1° C
(Which is normal for this time of year)

How big are the waves at Costellos today?

The current surf forecast for Costellos at 6AM is: 1.6m 7s primary swell from a East-southeast direction and 0.9m 7s secondary swell from a South-southeast direction (forecast issued at 01:00am May 15). The wind direction is predicted to be cross-offshore and the swell rating is 2.

Time (EDT) & DateWave HeightWave Period
Morning (15 May)5.5ft (1.7m)9s
Afternoon (15 May)7ft (2.2m)10s
Evening (15 May)6ft (1.9m)10s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Mostly dry. Warm (max 27°C on Sun afternoon, min 9°C on Fri morning). Wind will be generally light.

Friday
15
Saturday
16
Sunday
17
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)
1
2
1
1
1
2
2
3
3
3
3
2
2
0
1
1
0
1
1
1
1
0
0
0
Swell
Height Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Height MapHeight MapHeight Map
Wave
Height (m)
Direction
Period (s)
1.3
ESE
6
1.5
ESE
7
1.6
ESE
8
1.9
ESE
10
2.2
ESE
10
2.1
ESE
10
2
ESE
10
1.8
ESE
10
1.6
ESE
10
1.5
ESE
10
1.4
ESE
10
1.2
ESE
9
1.1
ESE
9
1
ESE
9
0.9
ESE
9
0.9
ESE
9
0.8
ESE
9
0.7
SE
8
0.6
SE
8
0.5
ESE
8
0.5
SSE
8
0.6
SE
8
0.6
SE
8
0.6
SE
8
Wave Graph
Metric surfscale
Energy kJ
143
192
370
638
892
880
778
637
502
437
351
253
212
161
127
124
90
72
55
39
37
53
41
40
Wind (km/h)
10
NNW
5
NNW
10
N
15
NNE
20
NE
15
NE
10
N
5
W
5
WSW
10
WSW
15
WSW
15
WSW
15
SW
15
SSW
15
SW
25
SW
20
WSW
15
WSW
15
W
20
WNW
20
WNW
15
WNW
15
NNW
10
NW
cross-off
cross-off
cross
cross-on
cross-on
cross-on
cross
glassy
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
off
off
off
off
cross-off
cross-off
cross-off
High Tide
10:25AM3.25m
10:40PM3.71m
11:17AM3.36m
11:31PM3.85m
12:10PM3.43m
Low Tide
4:14AM0.27m
4:25PM0.45m
5:06AM0.07m
5:16PM0.37m
5:58AM-0.07m
6:08PM0.32m
cloud
cloud
cloud
cloud
cloud
cloud
part cloud
cloud
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
cloud
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:20
5:18
5:18
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:59
8:00
8:00
Temp °C
9
9
9
9
9
9
9
10
10
10
12
19
22
24
21
17
17
17
18
24
26
27
24
20
7
7
7
6
5
6
7
9
8
7
9
17
19
20
18
13
14
15
17
20
21
23
21
17
Swell 1
Height (m)
Direction
Period (s)
1.3
ESE
6
1.5
ESE
7
1.6
ESE
8
1.9
ESE
10
2.2
ESE
10
2.1
ESE
10
2
ESE
10
1.8
ESE
10
1.6
ESE
10
1.5
ESE
10
1.4
ESE
10
1.2
ESE
9
1.1
ESE
9
1
ESE
9
0.9
ESE
9
0.9
ESE
9
0.8
ESE
9
0.8
SSE
6
0.7
S
6
0.5
S
6
0.5
SSE
8
0.6
SE
8
0.6
SE
8
0.6
SE
8
Energy kJ
143
192
370
638
892
880
778
637
502
437
351
253
212
161
127
124
90
43
31
18
37
53
41
40
Swell 2
Height (m)
Direction
Period (s)
0.3
E
10
0.9
SSE
7
0.9
SE
10
0.9
SSE
11
0.9
SSE
10
0.9
SSE
10
0.8
SSE
10
0.8
SSE
10
0.9
E
9
0.5
SSE
9
0.5
SSE
9
0.1
SE
11
0.1
SE
11
0.2
SSE
10
0.7
SE
8
0.6
SE
8
0.5
ESE
8
0.4
ESE
8
0.1
E
15
Energy kJ
18
83
151
196
178
182
103
127
133
45
47
5
5
10
72
55
39
26
4
Swell 3
Height (m)
Direction
Period (s)
0.7
SE
8
0.4
SSE
9
0.2
SSE
11
0.2
SSE
11
0.3
SSE
8
0.3
SSE
8
0.4
SSE
8
0.4
SE
8
0.1
SE
10
Energy kJ
63
29
12
12
14
14
26
17
4
Wind waves
Height (m)
Direction
Period (s)
0.2
WSW
2
0.2
SSW
2
0.4
S
3
0.6
S
4
0.8
SSE
5
1.1
S
6
1.1
S
6
0.3
WSW
3
0.1
SW
4
0.7
S
6
0.3
NW
2
0.3
NNW
3
0.3
N
2
Energy kJ
1
1
3
9
27
77
85
2
1
35
1
1
1
Nearest Offshore or Glassy
Rating
(10 max)
1
2
2
3
2
4
3
3
3
3
3
2
2
1
1
1
1
1
1
1
1
1
1
1
Distance (km)
0
0
5
5
39
5
5
0
0
0
0
0
0
8
0
92
14
0
0
0
0
5
38
162
Best forecast wave conditions in New Hampshire
Rating
(10 max)
1
2
2
3
4
3
3
3
3
3
2
2
1
1
1
1
1
1
1
Best forecast wave conditions in United States
Rating
(10 max)
3
3
3
3
3
4
3
3
4
4
3
4
3
1
3
4
3
4
4
4
4
3
4
4
Header Global
Rating
(10 max)
5
6
5
5
5
5
5
5
5
4
5
5
5
5
5
4
4
8
8
9
5
4
4
5
  • 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

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 Costellos 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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