Surf Forecasts:
Costellos surf forecast from 6 Aug 2026:
- Best quality surf: Thursday 6 Aug, 11PM (local time) - 2.5ft (0.8m), 5s period, S swell with cross-offshore winds.
- Most powerful swell: Saturday 8 Aug, 11PM (local time) - 2.5ft (0.8m), 6s period, SSE swell with 42 kJ wave energy.
- Next surfable swell (1★+): Thursday 6 Aug, 11PM (local time) - 2.5ft (0.8m), 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 06) at 11PM. The primary swell is predicted to be 0.8m and 5s period with a secondary swell of 0.5m and 5s. Another secondary swell of 0.2m and 8s 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 0.8m 6s and forecast to arrive on Saturday (Aug 08) at 11PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Thursday (Aug 13) at 2AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Thu 6th Aug) | 2.5ft (0.8m) 5s |
| Best Surf | 11PM (Thu 6th Aug) | 2.5ft (0.8m) 5s |
| Most Powerful | 11PM (Sat 8th Aug) | 2.5ft (0.8m) 6s |
Table - best surf conditions forecast for Costellos over the next 16 days.
The Lowdown
Alright, let’s put this in feet and miles. The story’s the same, just the numbers change.
We’re at Costellos, a reef break that’s inconsistent, and it’s been quiet as a mouse. Kicking off Thursday the 6th of August, we’ve got waves barely 1 ft from the SSE with a short period of 6 seconds. Combined energy is weak at 20. Glassy conditions on Friday the 7th, but the swell drops to 1 ft with energy at 15. It’s a wasteland. Poor conditions stretch all the way through to the 13th of August, with energy staying below 34. The water temp is about normal for this time of year.
Then, on Friday the 14th of August morning, there’s a little pulse: swell hits 4 ft from the SE, with offshore wind from the W at 12 mph. Energy climbs to 86 – still weak, but it’s the best we’ll see. The wave report calls it “surfable but ordinary,” and that’s the truth. You’ll get a few, but nothing to write home about. After that morning, it’s back to poor, tiny conditions through to the 21st of August, with onshore breezes and energy under 70.
So the only real highlight is that morning on the 14th. Swell direction (SE) is a decent match for what Costellos likes, and with clean offshore wind, it’s the one window worth a look. Everything else is a zero. The spot’s inconsistent, so a long dry spell like this isn’t out of the ordinary. The rest of the 16 days? Not much doing. Keep your board in the car for that one morning, but don’t hold your breath.
Rusty.
Short Range ForecastModerate rain (total 11mm), heaviest on Fri night. Warm (max 33°C on Sat afternoon, min 23°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 9mm), mostly falling on Mon night. Warm (max 33°C on Sun afternoon, min 21°C on Mon night). Wind will be generally light. | ||||||||||||||||||
Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||
Wave Height (m) Direction Period (s) | SSE 5 | SSE 6 | SSE 8 | SSE 5 | SE 7 | SE 7 | SE 8 | SE 8 | SE 8 | SSE 6 | S 5 | SSE 7 | SE 10 | SE 10 | SSE 4 | SSE 4 | S 5 | SSE 6 | SSE 6 |
Wave Graph  | |||||||||||||||||||
 kJ | 13 | 15 | 6 | 20 | 8 | 14 | 10 | 10 | 9 | 25 | 5 | 5 | 4 | 4 | 11 | 9 | 13 | 6 | 11 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | glassy | cross-on | off | cross-off | cross-off | cross-off | off | off | cross | cross-on | cross-on | glassy | off | off | cross-off |
High Tide | 5:14AM2.87m | 5:36PM3.23m | 6:17AM2.83m | 6:38PM3.28m | 7:23AM2.86m | 7:43PM3.37m | 8:30AM2.95m | 8:47PM3.49m | 9:32AM3.10m | 9:47PM3.62m | 10:29AM3.26m | 10:44PM3.73m | |||||||
Low Tide | 11:05PM0.67m | 11:15AM0.81m | 00:06AM0.64m | 12:16PM0.84m | 1:11AM0.58m | 1:21PM0.81m | 2:17AM0.46m | 2:27PM0.72m | 3:19AM0.32m | 3:30PM0.59m | 4:16AM0.18m | 4:29PM0.44m | |||||||
 |  |  |  | |  |  | | | | | |  | | |  | | | | |
 | — | 5:37 | — | — | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — |
 | 7:59 | — | 7:58 | — | — | 7:57 | — | — | 7:54 | — | — | 7:53 | — | — | 7:52 | — | — | 7:51 | — |
mm | — | — | 1 | 1 | — | — | 9 | — | — | — | — | — | — | — | — | 9 | — | — | — |
Temp °C | 29 | 29 | 30 | 30 | 30 | 31 | 23 | 29 | 33 | 28 | 30 | 33 | 30 | 24 | 26 | 23 | 27 | 32 | 28 |
Feels °C | 29 | 31 | 32 | 33 | 34 | 33 | 22 | 31 | 33 | 29 | 29 | 30 | 31 | 23 | 25 | 24 | 27 | 30 | 28 |
Swell 1 Height (m) Direction Period (s) | SSE 5 | SSE 6 | SSE 6 | SSE 5 | SSE 5 | SE 7 | SSE 5 | SE 8 | SE 8 | SSE 6 | S 5 | SSE 7 | SE 5 | SE 10 | SE 10 | SE 10 | S 5 | SSE 6 | SSE 6 |
| kJ | 13 | 15 | 4 | 20 | 5 | 14 | 4 | 10 | 9 | 25 | 4 | 5 | 1 | 4 | 4 | 4 | 13 | 6 | 11 |
Swell 2 Height (m) Direction Period (s) | SE 6 | SE 8 | SSE 8 | SE 8 | SE 7 | E 9 | SE 8 | SSE 4 | E 9 | E 8 | SSE 7 | SE 7 | SE 7 | SE 7 | E 8 | E 8 | SE 9 | SE 9 | SE 9 |
| kJ | 10 | 3 | 6 | 2 | 8 | 1 | 10 | 4 | 2 | 1 | 5 | 2 | 2 | 2 | 1 | 1 | 3 | 3 | 3 |
Swell 3 Height (m) Direction Period (s) | SE 8 | E 9 | E 9 | E 10 | E 9 | — | E 8 | E 9 | — | — | E 8 | E 9 | SE 10 | E 8 | — | — | E 8 | E 8 | E 9 |
| kJ | 3 | 2 | 2 | 2 | 2 | — | 1 | 1 | — | — | 1 | 2 | 4 | 1 | — | — | 1 | 1 | 2 |
Wind waves Height (m) Direction Period (s) | WSW 2 | — | SSE 3 | WSW 3 | — | SE 2 | — | S 5 | SSE 3 | — | — | WNW 2 | — | SSE 5 | SSE 4 | SSE 4 | — | — | NNW 2 |
| kJ | 1 | — | 4 | 1 | — | 1 | — | 7 | 2 | — | — | 1 | — | 2 | 11 | 9 | — | — | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 618 | 391 | 503 | 203 | 395 | 391 | 199 | 391 | 391 | 171 | 182 | 391 | 186 | 247 | 625 | 203 | 425 | 395 | 163 |
Best forecast wave conditions in New Hampshire | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
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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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