Costellos Surf Break

Lat Long: 42.95° N 70.78° W

Costellos Surf Forecast and Surf Report

Issued: 1 pm 12 Aug 2026 (local time)

Forecast update in  hr  min

Today's Costellos sea temperature is
21.5° C
1.9° 

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


Costellos surf forecast from 12 Aug 2026:

  • Best quality surf: Thursday 13 Aug, 5PM (local time) - 3.5ft (1.0m), 5s period, S swell with offshore winds.
  • Most powerful swell: Sunday 16 Aug, 11PM (local time) - 4.5ft (1.3m), 6s period, S swell with 106 kJ wave energy.
  • Next surfable swell (1★+): Thursday 13 Aug, 5PM (local time) - 3.5ft (1.0m), 5s period with S swell.

Best Forecast Surf Conditions for Costellos this week:

The surf forecast for Costellos over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 13) at 5PM. The primary swell is predicted to be 1.0m and 5s period with a secondary swell of 0.8m and 5s. Another secondary swell of 0.1m and 4s is also forecast. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Costellos in the next 16 days are 1.3m 6s and forecast to arrive on Sunday (Aug 16) at 11PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Thursday (Aug 13) at 11AM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+) 5PM (Thu 13th Aug)3.5ft (1.0m) 5s
Best Surf 5PM (Thu 13th Aug)3.5ft (1.0m) 5s
Most Powerful11PM (Sun 16th Aug)4.5ft (1.3m) 6s

Table - best surf conditions forecast for Costellos over the next 16 days.


The Lowdown

Alright, mate, Rusty here. Let’s have a look at what’s on the cards for the next couple of weeks.

Honestly, it’s a pretty grim stretch ahead. We’ve got a long, quiet run with barely any surf to speak of until the very end of the period. The first few days are a total write-off, with tiny, weak swell and mostly average to poor conditions. There’s a solid gap of over a week with nothing worthwhile. The only real glimmer of light arrives right at the tail end, around Thursday the 27th of August, and even then, it’s not a classic.

Let’s start with the only spot worth mentioning: Costellos (reef). The water is sitting at 71° – that’s a touch warmer than normal for this time of year, so you might not need the thickest wetsuit.

The opening days from Wednesday the 12th right through to nearly the end of the month are all showing poor surf. The swell is tiny, often under 2 ft, coming from the SE with short periods – just a weak, unorganised mess. Combined energy values are mostly in the low double digits (12 to 48), which is very weak. The wind is all over the place, but there’s nothing that makes it worth paddling out. It’s a real desert.

Then, on Thursday the 27th of August, we get a bit of a pulse. The morning shows a bump to 5 ft swell from the ESE with a period of 8 seconds, and combined energy jumps to 344, which is moderate. The wind is a cross-onshore from the NNE at 9 mph, so it’ll be a bit bumpy. The afternoon sees 5 ft swell from the same direction, period still 8 seconds, energy at 299, but the wind goes full onshore from the ESE at 9 mph, which is not your friend. This is the only time in the whole outlook that the swell cracks over 5 ft, but it’s far from ideal. It’s more of a novelty than a standout. The waves will be messy and hard to read, and with the swell being mostly short-period, it won’t have much power. The reef at Costellos should handle it better than a beach, but the onshore wind will kill the quality.

So, to be honest, this is a two-week period best spent doing other things. The only real chance for a wave is that Thursday the 27th, but don’t expect a classic. It’s more of a “if you’re desperate” situation. The rest is dead flat or close to it. For the way it’s looking, I’d say it’s more interesting for kite surfing than paddle surfing on that Thursday, with the onshore wind and some size.

Stay patient, and keep an eye on the forecasts – it can’t stay this poor forever.

Rusty

Short Range Forecast

Mostly dry. Warm (max 27°C on Wed afternoon, min 16°C on Sat morning). Wind will be generally light.

Days 5-7 Weather Summary

Moderate rain (total 19mm), heaviest on Sun afternoon. Warm (max 26°C on Mon afternoon, min 17°C on Sun afternoon). Wind will be generally light.

Wed
12
Thursday
13
Friday
14
Saturday
15
Sunday
16
Monday
17
Tuesday
18
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
1
0
0
0
0
0
0
0
0
0
1
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)
0.1
SE
14
0.4
S
4
0.1
SE
14
1
S
5
0.2
ESE
10
0.3
SE
10
0.3
SE
10
0.5
N
4
0.1
SE
12
0.2
ESE
9
0.1
SE
9
0.1
SE
9
1.1
S
5
1.1
SSE
6
0.6
SSE
5
0.5
SE
7
0.5
SE
8
0.5
SE
8
0.6
SE
8
0.5
SE
6
Wave Graph
Metric surfscale
Energy kJ
8
8
8
51
9
15
14
9
6
8
3
3
52
77
19
27
29
32
41
18
Wind (km/h)
10
SSW
10
WSW
10
WSW
5
W
15
WNW
25
NW
20
NW
10
NW
5
NE
15
S
10
WSW
15
SSW
25
S
10
WNW
5
N
0
SE
10
NNW
5
SSW
20
SSE
10
WSW
Wind State
cross-off
off
cross-off
off
cross-off
cross-off
cross-off
cross-off
cross-on
cross
cross-off
cross-off
cross
cross-off
cross
glassy
cross-off
glassy
cross
cross-off
High Tide
11:38PM3.78m
12:13PM3.52m
00:30AM3.77m
1:01PM3.57m
1:20AM3.68m
1:48PM3.56m
2:09AM3.52m
2:34PM3.49m
2:58AM3.32m
3:20PM3.38m
3:47AM3.10m
4:07PM3.23m
4:39AM2.89m
Low Tide
5:24PM0.31m
6:00AM0.01m
6:17PM0.23m
6:49AM0.03m
7:08PM0.21m
7:35AM0.12m
7:58PM0.25m
8:21AM0.28m
8:47PM0.35m
9:06AM0.47m
9:37PM0.49m
9:52AM0.68m
10:28PM0.64m
cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
part cloud
part cloud
mod rain
rain showers
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:46
5:47
5:48
5:48
5:50
5:50
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:50
7:47
7:46
7:45
7:44
7:43
7:40
 mm
9
10
Temp °C
27
24
25
27
25
22
25
22
20
23
21
24
22
18
24
26
23
23
24
21
Feels °C
26
23
25
27
23
17
20
18
18
20
18
22
19
20
25
27
23
23
21
19
  • 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 
submit an eyeball surf report

Quick surf report for Costellos:

join our community of surf reporters

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.


Information about the Costellos Surf forecast

The above surf forecast table for Costellos provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Costellos can be found by selecting the local surf guide option on the grey menu. Our Costellos surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Costellos) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).

Further information to help with frequently asked questions about our surf forecast for Costellos may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.

Costellos is 5 km (3 miles) from Hampton. If you plan a vacation in New Hampshire, look for hotels and other accommodation in Hampton. Hampton has rooms for a wide range of budgets as well as car hire and transport links.

Nearest locationNearest