Surf Forecasts:
Costellos surf forecast from 3 Aug 2026:
- Best quality surf: Monday 3 Aug, 8PM (local time) - 5.5ft (1.7m), 8s period, SSE swell with cross-offshore winds.
- Most powerful swell: Monday 3 Aug, 5PM (local time) - 6ft (1.8m), 8s period, SSE swell with 358 kJ wave energy.
- Next surfable swell (1★+): Monday 3 Aug, 8PM (local time) - 5.5ft (1.7m), 8s period with SSE 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 Monday (Aug 03) at 8PM. The primary swell is predicted to be 1.7m and 8s period. 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 8s and forecast to arrive on Monday (Aug 03) at 5PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Monday (Aug 03) at 8PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Mon 3rd Aug) | 5.5ft (1.7m) 8s |
| Best Surf | 8PM (Mon 3rd Aug) | 5.5ft (1.7m) 8s |
| Most Powerful | 5PM (Mon 3rd Aug) | 6ft (1.8m) 8s |
Table - best surf conditions forecast for Costellos over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s be straight with you – this is a tough stretch for surf. The next 16 days are looking pretty flat, so don’t get your hopes up for any real waves.
The only spot on the radar is Costellos, a reef break that’s pretty inconsistent and needs a decent swell from the southeast to get going. The problem is, the swell energy just isn’t there. Starting Monday the 3rd of August, we’ve got a weak, short-period SSE swell pushing in at about 3 ft, but the wind is messy and the combined energy is a weak 61. Tuesday the 4th sees a tiny 2 ft SSE swell with clean offshore wind, but the energy is only 39 – barely a ripple. The rest of the week is more of the same: small, weak, and inconsistent. By Saturday the 8th, we’re down to 1 ft of glassy, near-flat surf (energy 17).
The water temp is about average for this time of year, nothing unusual.
The truth is, there’s no standout period. The whole 16-day window is a write-off. The swell never gets above 6 ft, and even that poor 6 ft on Monday afternoon is a wind-affected, cross-off mess.
If you’re desperate, the cleanest conditions will be on the morning of Tuesday the 4th or Saturday the 8th, with light offshore or glassy wind, but you’ll be scratching for a knee-high wave. This sort of dry spell is normal for the area; it doesn’t stay poor forever, but for now, the boards are staying in the car.
Rusty.
Short Range ForecastHeavy rain (total 38mm), heaviest during Mon afternoon. Warm (max 31°C on Tue afternoon, min 18°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 5mm), mostly falling on Wed night. Warm (max 34°C on Fri afternoon, min 22°C on Wed night). Wind will be generally light. | ||||||||||||||||||
Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | ||||||||||||||
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 4 | SSE 5 | SSE 8 | SSE 8 | SSE 8 | SSE 7 | SE 7 | SE 7 | SE 7 | SE 5 | SSE 6 | SE 6 | S 6 | S 6 | S 5 | SE 8 | SE 8 | SE 8 | SE 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 26 | 58 | 358 | 128 | 39 | 43 | 22 | 23 | 22 | 42 | 25 | 9 | 62 | 25 | 13 | 9 | 16 | 16 | 10 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | off | off | off | cross-off | cross | cross | glassy | cross-off | cross | cross-off | cross-off | cross-off | off | glassy | cross-on | off |
High Tide | 2:43AM3.13m | 3:08PM3.18m | 3:28AM3.04m | 3:51PM3.20m | 4:18AM2.95m | 4:41PM3.21m | 5:14AM2.87m | 5:36PM3.23m | 6:17AM2.83m | 6:38PM3.28m | 7:23AM2.86m | 7:43PM3.37m | |||||||
Low Tide | 8:36PM0.67m | 8:54AM0.61m | 9:21PM0.67m | 9:35AM0.68m | 10:10PM0.67m | 10:22AM0.75m | 11:05PM0.67m | 11:15AM0.81m | 00:06AM0.64m | 12:16PM0.84m | 1:11AM0.58m | 1:21PM0.81m | 2:17AM0.46m | ||||||
 |  |  |  |  | |  |  |  | | | | | | | | | | | |
 | — | 5:35 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:41 | — | — |
 | 8:02 | — | 8:01 | — | — | 8:00 | — | — | 7:59 | — | — | 7:58 | — | — | 7:57 | — | — | 7:54 | — |
mm | 2 | 9 | 17 | 5 | — | — | — | — | 5 | 3 | — | — | — | — | — | 2 | — | — | — |
Temp °C | 25 | 22 | 23 | 21 | 27 | 31 | 28 | 25 | 23 | 22 | 28 | 32 | 29 | 31 | 34 | 30 | 27 | 28 | 27 |
Feels °C | 24 | 24 | 22 | 22 | 24 | 28 | 27 | 23 | 25 | 24 | 29 | 32 | 30 | 33 | 33 | 30 | 30 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | SE 7 | SE 9 | — | SSE 8 | SSE 8 | SSE 7 | SSE 5 | SE 7 | SE 7 | SE 5 | SSE 6 | SE 6 | SSE 6 | S 6 | SE 8 | SSE 5 | SE 8 | SE 8 | SSE 4 |
| kJ | 7 | 3 | — | 128 | 39 | 43 | 20 | 23 | 22 | 42 | 25 | 9 | 43 | 25 | 9 | 9 | 16 | 16 | 8 |
Swell 2 Height (m) Direction Period (s) | ESE 9 | — | — | — | — | — | SE 7 | E 10 | E 9 | E 9 | E 9 | SSE 8 | E 10 | SE 8 | E 9 | SE 8 | — | E 8 | SE 8 |
| kJ | 7 | — | — | — | — | — | 22 | 2 | 2 | 2 | 2 | 6 | 2 | 3 | 2 | 9 | — | 1 | 9 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | E 10 | — | — | — | — | E 9 | — | E 9 | — | E 8 | E 8 | — | E 8 |
| kJ | — | — | — | — | — | — | 2 | — | — | — | — | 2 | — | 2 | — | 1 | 1 | — | 1 |
Wind waves Height (m) Direction Period (s) | SSE 4 | SSE 5 | SSE 8 | W 3 | SW 3 | SSW 3 | WSW 3 | — | SSE 2 | — | — | SE 3 | S 6 | W 3 | S 5 | — | — | SE 2 | S 4 |
| kJ | 26 | 58 | 358 | 1 | 2 | 7 | 2 | — | 1 | — | — | 2 | 62 | 1 | 13 | — | — | 1 | 10 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 1257 | 1728 | 386 | 0 | 38 | 5 | 168 | 198 | 198 | 198 | 38 | 198 | 0 | 391 | 38 | 391 | 182 | 503 | 391 |
Best forecast wave conditions in New Hampshire | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
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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.
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