Costellos Surf Break

Lat Long: 42.95° N 70.78° W

Costellos Surf Forecast and Surf Report

Issued: 7 am 27 Aug 2026 (local time)

Forecast update in  hr  min

Today's Costellos sea temperature is
18.8°C
0.2° 

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


Costellos surf forecast from 27 Aug 2026:

  • Best quality surf: Friday 28 Aug, 2AM (local time) - 2.5ft (0.7m), 8s period, SE swell with cross-offshore winds.
  • Most powerful swell: Wednesday 2 Sep, 8PM (local time) - 6ft (1.8m), 7s period, SE swell with 316 kJ wave energy.
  • Next surfable swell (1★+): Friday 28 Aug, 2AM (local time) - 2.5ft (0.7m), 8s period with SE 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 Friday (Aug 28) at 2AM. The primary swell is predicted to be 0.7m and 8s period with a secondary swell of 0.1m and 10s. Another secondary swell of 0.9m and 5s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Costellos in the next 16 days are 1.8m 7s and forecast to arrive on Wednesday (Sep 02) at 8PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 2s period and expected on Sunday (Aug 30) at 11AM.

Wave TypeTime (EDT) & Date Wave Height & Period
Next good surf (1 star+) 2AM (Fri 28th Aug)2.5ft (0.7m) 8s
Best Surf 2AM (Fri 28th Aug)2.5ft (0.7m) 8s
Most Powerful 8PM (Wed 2nd Sep)6ft (1.8m) 7s

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


The Lowdown

Alright, let’s look at what’s cookin’ at Costellos over the next couple of weeks.

Honestly, mate, it’s a total flat spell. The whole 16-day stretch is a bust for any decent surf. You’re lookin’ at a long dry run from late August right through the first half of September.

Thursday the 27th kicks off with a tiny 3ft SE swell, but the cross breeze out of the south is messin’ it up, and the wave energy is only moderate at 111 – but it’s poor quality. The afternoon’s no better: swell bumps to 5ft but the period drops to a lousy 5 seconds, energy falls to 92. Total junk.

Friday the 28th is the closest we get to a highlight, and that’s only because the morning has light offshore winds from the south. Swell’s only 2ft from the SE, period a weak 8 seconds, energy down at 81. It’s clean, but there’s no power. Saturday morning the 29th goes glassy with that same 2ft SE swell, but the energy’s just 57 – barely a ripple.

From Sunday the 30th onward, it’s grim. Swell drops to 1ft and then 1ft, with energy numbers fallin’ into the teens and single digits. We get a few clean moments with offshore or cross-off breezes, but the waves are too small to ride. Even the little bump on Wednesday the 2nd of September – 7ft SE swell with a 6-second period and 329 energy – is totally wrecked by cross-onshore wind and chop. That kind of size with short period is messy, and with the wind, it’s really more of a kite session than a paddle.

The entire second week stays small and poor. No standout days. The best you can hope for is a clean but tiny morning, like Friday the 11th of September, with a 1ft swell and offshore WNW wind at 15 mph. Clean, sure, but you’d be lucky to get a ride.

Water temp is about 66°F, which is normal for this time of year.

Bottom line – leave the boards at home. This is a rare, bleak run for Costellos, and with the break bein’ inconsistent anyway, a long blank stretch like this ain’t too surprising.

Rusty.

Short Range Forecast

Light rain (total 4mm), mostly falling on Fri afternoon. Warm (max 27°C on Thu afternoon, min 15°C on Sat morning). Wind will be generally light.

Days 4-6 Weather Summary

Heavy rain (total 24mm), heaviest during Tue morning. Warm (max 30°C on Sun afternoon, min 16°C on Mon night). Wind will be generally light.

Thursday
27
Friday
28
Saturday
29
Sunday
30
Monday
31
Tuesday
1
Wednesday
2
AM
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
1
1
1
0
1
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)
0.9
SE
8
1.4
SE
5
0.7
SE
8
0.6
SE
8
0.6
SE
8
0.7
SE
8
0.6
SE
8
0.6
SE
8
0.5
SE
8
0.4
SE
7
0.3
SE
8
0.6
SSE
5
0.3
SE
8
0.3
SE
8
0.3
SE
8
0.3
SE
8
0.3
SE
8
0.3
SE
10
1.1
SE
5
2
SE
6
1.6
ESE
7
Wave Graph
Metric surfscale
Energy kJ
105
90
74
55
54
63
49
37
32
15
11
21
11
11
10
10
10
14
47
311
250
Wind (km/h)
15
S
20
SSE
15
SSW
10
S
5
W
15
N
5
ENE
15
SSE
10
WSW
10
SW
10
W
10
W
10
NE
15
NE
10
NE
15
ENE
15
ENE
10
ENE
10
E
15
SE
15
SE
Wind State
cross
cross
cross-off
cross-off
off
cross
glassy
cross-on
cross-off
cross-off
off
off
cross-on
cross-on
cross-on
on
on
on
on
cross-on
cross-on
High Tide
11:24AM3.04m
11:35PM3.29m
12:01PM3.16m
00:15AM3.32m
12:38PM3.27m
00:55AM3.32m
1:16PM3.34m
1:36AM3.28m
1:55PM3.38m
2:20AM3.20m
2:38PM3.39m
3:07AM3.10m
3:25PM3.36m
4:00AM2.99m
Low Tide
5:24PM0.69m
5:52AM0.49m
6:05PM0.58m
6:28AM0.45m
6:45PM0.50m
7:05AM0.45m
7:27PM0.45m
7:43AM0.49m
8:11PM0.43m
8:24AM0.55m
8:58PM0.45m
9:09AM0.64m
9:49PM0.49m
part cloud
part cloud
part cloud
part cloud
thunderstorm
clear
clear
clear
clear
clear
part cloud
cloud
light rain
part cloud
mod rain
heavy rain
light rain
rain showers
light rain
light rain
mod rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:01
6:01
6:03
6:03
6:05
6:07
6:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:27
7:24
7:22
7:22
7:20
7:17
7:15
 mm
4
2
8
11
2
1
2
1
6
Temp °C
25
27
25
26
26
25
18
21
19
26
30
27
20
18
16
16
16
17
17
18
18
Feels °C
24
25
22
28
28
25
17
18
17
23
28
25
21
18
15
14
14
16
17
17
17
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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.

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