Surf Forecasts:
Costellos surf forecast from 30 Aug 2026:
- Best quality surf: Thursday 3 Sep, 11AM (local time) - 7ft (2.1m), 7s period, SSE swell with offshore winds.
- Most powerful swell: Thursday 3 Sep, 11AM (local time) - 7ft (2.1m), 7s period, SSE swell with 397 kJ wave energy.
- Next surfable swell (1★+): Thursday 3 Sep, 5AM (local time) - 5.5ft (1.7m), 6s 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 Thursday (Sep 03) at 5AM. The primary swell is predicted to be 1.7m and 6s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Costellos in the next 16 days are 2.1m 7s and forecast to arrive on Thursday (Sep 03) at 11AM. 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 3s period and expected on Friday (Sep 04) at 5PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Thu 3rd Sep) | 5.5ft (1.7m) 6s |
| Best Surf | 11AM (Thu 3rd Sep) | 7ft (2.1m) 7s |
| Most Powerful | 11AM (Thu 3rd Sep) | 7ft (2.1m) 7s |
Table - best surf conditions forecast for Costellos over the next 16 days.
The Lowdown
Alright, Rusty here again. Let’s talk about the next couple of weeks, and I'll tell ya, it's pretty slim pickings. There’s a long stretch of flat, gutless conditions, so don’t get too fired up. We’re looking at one main window where it might be worth a paddle, but otherwise, it’s a waiting game.
For Costellos, the water temp is about 66°F, which is normal for this time of year. The first few days are dead. Sunday the 30th and Monday the 31st have nothing but 1ft slop. It's not even worth looking at.
There’s a big gap of a few days with no real surf. The energy is weak, just in the low double digits. Tuesday the 1st of September bumps up to around 4ft but with a poor period and junky conditions. Not good.
Your best bet is Thursday the 3rd of September. The swell pushes to around 5ft from the southeast, and the energy gets into the 100s. By the afternoon, it’s glassy, and while it’s still a bit soft and disorganized, it’s the cleanest it’ll be. That’s your window if you’re desperate for a wave.
After that, it’s back to the flatness. Winds go cross-off and clean things up, but the swell drops back under 3ft. There’s another pulse on Sunday the 6th, about 4ft, but the cross-shore wind chops it up.
The second week stays quiet. Wednesday the 9th has a 4ft southerly swell with light offshore morning winds, making it surfable and clean. But it's nothing to write home about. The rest of the time, it’s tiny, weak slop, mostly under 2ft, and often onshore or messy.
So, the only real standout is that Thursday the 3rd. The size is there, and the wind cleans up. But with that short period, it’s not going to have much grunt. It’s all about grabbing that one session if you can.
Otherwise, it's a lot of nothing. It’s a frustrating flat spell, but these things never last forever. The forecast can change. Keep your board handy. This is Rusty, out.
Short Range ForecastLight rain (total 3mm), mostly falling on Mon night. Warm (max 29°C on Sun afternoon, min 17°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 31mm), heaviest during Wed afternoon. Warm (max 23°C on Thu afternoon, min 16°C on Wed afternoon). Wind will be generally light. | |||||||||||||||||||
Sun 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | ||||||||||||||
PM | 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) | SE 8 | SSE 6 | SE 8 | SE 8 | SSE 4 | SE 8 | SE 8 | SE 12 | SE 11 | SE 10 | SSE 5 | SSE 7 | SE 7 | SE 7 | SE 8 | SE 8 | SE 8 | NNE 5 | NE 5 | E 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 24 | 17 | 11 | 11 | 17 | 10 | 11 | 23 | 75 | 65 | 106 | 397 | 225 | 91 | 116 | 57 | 28 | 51 | 18 | 5 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | on | cross-on | cross-off | cross-on | cross-on | cross-on | cross | cross-on | cross-on | off | glassy | off | cross-off | cross-off | cross-off | cross-on | cross | cross |
High Tide | 1:36AM3.28m | 1:55PM3.38m | 2:20AM3.20m | 2:38PM3.39m | 3:07AM3.10m | 3:25PM3.36m | 4:00AM2.99m | 4:18PM3.32m | 4:59AM2.90m | 5:18PM3.28m | 6:05AM2.85m | 6:24PM3.27m | ||||||||
Low Tide | 7:27PM0.45m | 7:43AM0.49m | 8:11PM0.43m | 8:24AM0.55m | 8:58PM0.45m | 9:09AM0.64m | 9:49PM0.49m | 10:00AM0.74m | 10:47PM0.55m | 10:58AM0.82m | 11:51PM0.58m | 12:03PM0.86m | 00:59AM0.56m | |||||||
 |  |  | |  | |  |  | |  |  | |  |  |  | | | | | | |
 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — |
 | 7:22 | — | — | 7:20 | — | — | 7:17 | — | — | 7:15 | — | — | 7:15 | — | — | 7:13 | — | — | 7:10 | — |
mm | — | — | — | — | 2 | — | 1 | — | — | 8 | 18 | 2 | 3 | — | — | — | — | — | — | — |
Temp °C | 29 | 23 | 20 | 19 | 20 | 17 | 19 | 19 | 19 | 18 | 19 | 19 | 23 | 20 | 22 | 23 | 20 | 19 | 21 | 20 |
Feels °C | 26 | 22 | 19 | 17 | 20 | 18 | 19 | 18 | 18 | 16 | 22 | 21 | 27 | 22 | 20 | 21 | 17 | 15 | 18 | 18 |
Swell 1 Height (m) Direction Period (s) | SE 8 | SSE 6 | SE 8 | SE 8 | SE 8 | SE 8 | SE 8 | SE 10 | SE 11 | SE 10 | SE 10 | SE 7 | SE 7 | SE 7 | SE 8 | SE 8 | SE 8 | SE 8 | NE 5 | E 8 |
| kJ | 24 | 17 | 11 | 11 | 10 | 10 | 11 | 14 | 75 | 65 | 46 | 303 | 225 | 91 | 116 | 57 | 28 | 9 | 18 | 5 |
Swell 2 Height (m) Direction Period (s) | E 5 | SE 7 | — | — | — | — | SE 10 | SE 12 | — | — | — | — | — | — | — | SSE 7 | — | E 9 | ESE 8 | SE 9 |
| kJ | 1 | 8 | — | — | — | — | 4 | 23 | — | — | — | — | — | — | — | 10 | — | 6 | 13 | 3 |
Swell 3 Height (m) Direction Period (s) | E 8 | SE 9 | — | — | — | E 14 | E 13 | — | — | — | — | — | — | — | — | — | — | — | — | NE 5 |
| kJ | 1 | 3 | — | — | — | 4 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Wind waves Height (m) Direction Period (s) | SSW 3 | — | NNE 3 | SE 3 | SSE 4 | SSE 3 | SSE 4 | SE 4 | SSE 4 | SE 5 | SSE 5 | SSE 7 | WNW 3 | WNW 2 | WNW 3 | NW 3 | N 4 | NNE 5 | — | NE 4 |
| kJ | 1 | — | 1 | 2 | 17 | 2 | 5 | 7 | 13 | 30 | 106 | 397 | 1 | 1 | 1 | 6 | 5 | 51 | — | 5 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 2025 | 247 | 620 | 501 | 910 | 910 | 2017 | 501 | 544 | 2017 | 435 | 0 | 0 | 0 | 0 | 0 | 493 | 911 | 3019 | 2570 |
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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