
Surf Forecasts:
Costellos surf forecast from 2 Sep 2026:
- Best quality surf: Saturday 5 Sep, 11PM (local time) - 4.5ft (1.4m), 7s period, ENE swell with cross-offshore winds.
- Most powerful swell: Sunday 6 Sep, 2PM (local time) - 5ft (1.6m), 7s period, NE swell with 254 kJ wave energy.
- Next surfable swell (1★+): Thursday 3 Sep, 11AM (local time) - 4ft (1.2m), 5s 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 11AM. The primary swell is predicted to be 1.2m and 5s period with a secondary swell of 0.5m and 9s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Costellos in the next 16 days are 1.6m 7s and forecast to arrive on Sunday (Sep 06) at 2PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Tuesday (Sep 08) at 5PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Thu 3rd Sep) | 4ft (1.2m) 5s |
| Best Surf | 11PM (Sat 5th Sep) | 4.5ft (1.4m) 7s |
| Most Powerful | 2PM (Sun 6th Sep) | 5ft (1.6m) 7s |
Table - best surf conditions forecast for Costellos over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's on the table for the next couple of weeks. Gotta be straight with you – it's a lean stretch for Costellos. We're looking at a long, quiet run with very few windows that are worth paddling out for.
The first real sniff of something half-decent doesn't show up until Thursday morning, September 3rd. We're getting a little 4ft SSE swell rolling in, but the period is short at 5 seconds, so it'll be a bit weak and messy. The big draw here is the wind: a glassy NW breeze. That'll make the surface clean as a whistle, but the wave energy is still pretty low (109). It's a tiny window of hope, but it's a start.
Friday morning, September 4th, is another one to keep an eye on. Swell drops back to 2.6ft from the ESE, but with a light WSW cross-offshore breeze, the conditions should be clean. Wave energy is low (68), but for a quiet period, it's surfable. If you're itching for a paddle, that's your best bet for some clean little lines.
The swell does try to show some muscle for the weekend of the 5th and 6th, with Saturday afternoon seeing 4.9ft and Sunday morning hitting 5.2ft, and the energy jumping up hard (344 and 448). But the wind is a mess – cross and cross-onshore, making it choppy and poor. That's a write-off.
After that, the forecast is a long, slow grind of tiny waves and poor conditions. We're talking days of 0.7ft to 2.3ft slop, with the odd bit of clean wind but no real energy to work with. There's a small window on Tuesday afternoon, September 15th, with 2.6ft ENE swell and a light offshore breeze, making it clean. It's not much, but it's clean.
The stand-out, and this is a real late-bloomer, is the last day. Thursday, September 17th. The afternoon session shows a clean 1.6ft SE swell under a gentle WNW offshore breeze. The wave energy is still modest (74), but the combination of a clean offshore wind (the best kind) and a little bit of shape makes this the closest thing to a winner in the whole outlook. The swell direction is SE, which is a good match for the break's optimum. It's a reef break, and it's inconsistent, so you'll be waiting for sets, but when they come, they'll be clean.
Overall, keep your expectations low. The first week is a write-off apart from a couple of brief, clean windows. The best of a quiet bunch is the Thursday afternoon, September 17th, if you're patient and want a clean, soulful session. No big swells, no magic, just a few clean chances.
Short Range ForecastModerate rain (total 13mm), heaviest on Thu morning. Warm (max 25°C on Fri morning, min 16°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Sat afternoon. Warm (max 24°C on Tue morning, min 13°C on Sat night). Wind will be generally light. | |||||||||||||||||||
Wed 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | ||||||||||||||
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 10 | SE 10 | SSE 5 | SE 5 | ESE 6 | ESE 7 | ESE 7 | ESE 7 | NE 5 | ENE 7 | ENE 7 | NE 7 | ENE 7 | E 10 | ENE 10 | E 10 | E 9 | E 9 | E 9 | S 6 |
Wave Graph | ||||||||||||||||||||
64 | 59 | 70 | 49 | 67 | 51 | 70 | 46 | 41 | 192 | 193 | 251 | 136 | 78 | 75 | 67 | 15 | 13 | 6 | 40 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | glassy | cross-on | cross-off | cross-off | cross | cross-off | cross | cross-on | cross | cross | on | cross-off | cross-on | cross | off | cross-off | cross-off | cross-off |
High Tide | 3:25PM3.36m | 4:00AM2.99m | 4:18PM3.32m | 4:59AM2.90m | 5:18PM3.28m | 6:05AM2.85m | 6:24PM3.27m | 7:14AM2.88m | 7:32PM3.31m | 8:20AM2.98m | 8:37PM3.40m | 9:20AM3.14m | 9:37PM3.50m | |||||||
Low Tide | 9:49PM0.49m | 10:00AM0.74m | 10:47PM0.55m | 10:58AM0.82m | 11:51PM0.58m | 12:03PM0.86m | 00:59AM0.56m | 1:13PM0.83m | 2:05AM0.49m | 2:20PM0.73m | 3:06AM0.38m | 3:22PM0.58m | 4:01AM0.27m | |||||||
— | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | |
7:15 | — | — | 7:15 | — | — | 7:13 | — | — | 7:10 | — | — | 7:08 | — | — | 7:07 | — | — | 7:06 | — | |
mm | — | 3 | 10 | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 18 | 18 | 18 | 23 | 19 | 25 | 24 | 22 | 18 | 18 | 15 | 19 | 18 | 18 | 20 | 23 | 22 | 24 | 27 | 24 |
Feels °C | 16 | 17 | 18 | 24 | 19 | 26 | 24 | 22 | 16 | 16 | 13 | 13 | 13 | 17 | 17 | 20 | 20 | 22 | 23 | 22 |
Swell 1 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 9 | SE 5 | ESE 6 | ESE 7 | ESE 7 | ESE 7 | ESE 7 | ENE 7 | — | ENE 7 | ENE 7 | E 10 | ENE 10 | E 10 | E 9 | E 9 | E 9 | S 6 |
64 | 59 | 39 | 49 | 67 | 51 | 70 | 46 | 31 | 152 | — | 197 | 136 | 78 | 75 | 67 | 15 | 13 | 6 | 40 | |
Swell 2 Height (m) Direction Period (s) | ENE 3 | ENE 4 | — | SE 9 | SE 9 | SE 8 | E 7 | — | SE 8 | — | — | — | SE 9 | ENE 7 | SE 9 | SE 9 | NE 5 | SE 9 | SE 9 | E 8 |
1 | 1 | — | 28 | 19 | 17 | 4 | — | 3 | — | — | — | 3 | 25 | 3 | 3 | 1 | 3 | 3 | 6 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | SE 9 | SE 9 | — | SE 8 | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 3 | — | 3 | — | — | — | |
Wind waves Height (m) Direction Period (s) | ESE 3 | SSE 4 | SSE 5 | — | N 3 | — | SSE 2 | — | NE 5 | ENE 6 | ENE 7 | NE 7 | — | — | — | — | SSW 4 | SSW 4 | SSW 4 | WNW 2 |
2 | 10 | 70 | — | 1 | — | 1 | — | 41 | 192 | 193 | 251 | — | — | — | — | 4 | 7 | 29 | 1 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 896 | 14 | 0 | 38 | 0 | 0 | 276 | 14 | 2758 | 2758 | 5 | 44 | 38 | 0 | 5 | 69 | 96 | 501 | 848 | 118 |
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.










