Surf Forecasts:
Costellos surf forecast from 14 Sep 2026:
- Best quality surf: Sunday 20 Sep, 8PM (local time) - 5ft (1.6m), 8s period, E swell with glassy winds.
- Most powerful swell: Sunday 20 Sep, 8PM (local time) - 5ft (1.6m), 8s period, E swell with 316 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 8PM (local time) - 2ft (0.6m), 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 Monday (Sep 14) at 8PM. The primary swell is predicted to be 0.6m and 8s period with a secondary swell of 0.3m and 3s. 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 1.6m 8s and forecast to arrive on Sunday (Sep 20) at 8PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Wednesday (Sep 16) at 5AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Mon 14th Sep) | 2ft (0.6m) 8s |
| Best Surf | 8PM (Sun 20th Sep) | 5ft (1.6m) 8s |
| Most Powerful | 8PM (Sun 20th Sep) | 5ft (1.6m) 8s |
Table - best surf conditions forecast for Costellos over the next 16 days.
The Lowdown
Alright, Rusty here with the real talk. The next couple of weeks at Costellos are pretty grim for the most part. We’re lookin’ at a long flat spell before a single, solid window shows up.
From the 14th of September all the way through the 23rd, it’s a wasteland. Tiny, weak waves – 0.6ft to 2ft – with next to no energy (combined energy barely breaking 50). The wind is mostly onshore or cross-on, making everything messy and small. That’s a solid week and a half of poor conditions. Don’t bother paddling out.
The first little bump shows up on Sunday the 20th. Morning brings 6ft from the ENE, but with a short period of 6 seconds and a messy cross-shore wind, it’s lumpy. Energy jumps to 263 (moderate), but it’s not pretty. Afternoon cleans up a bit with a light onshore wind, still 5ft, but it’s only "marginal." A kite surfer might like that wind and bump, but for a paddle surfer? Hard pass.
That small, messy energy lingers for a couple of days – 4ft to 5ft through the 21st to 23rd – but wind stays bad and energy is moderate at best.
Now, here’s the one and only standout, and it’s a long-range bet. On Thursday the 24th of September, the swell finally shows up. Morning is still a write-off with strong cross-winds, but the afternoon is the real deal. We’ve got a solid 8ft of swell from the ESE, with a period of 9 seconds. That’s a proper groundswell. The combined energy hits 948, which is strong. And the wind? It goes clean cross-offshore out of the NW. That is the recipe for clean, powerful waves at Costellos. This is an exposed reef that loves a SE swell, so the direction is perfect. Water temp is around 63°, which is normal for this time of year.
This reef is inconsistent, but when it’s on, it’s on. 8ft is big – experienced surfers only. It’s going to be powerful. Crowds are "often" here, and with clean, punchy swell like that, the line-up will be packed. The quality is there, the wind is perfect – this is your one window if you can wait. After that, the swell backs right off into tiny, weak waves through to the end of the month. So, one shot, and that’s it.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Wed afternoon, min 11°C on Tue morning). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 52mm), heaviest during Sat night. Warm (max 22°C on Fri afternoon, min 13°C on Sat morning). Wind will be generally light. | ||||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | |||||||||||||||
AM | 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 9 | ESE 8 | NNE 5 | NE 5 | ENE 6 | ESE 9 | ESE 9 | SSE 4 | ESE 13 | ESE 13 | ESE 7 | E 7 | ESE 7 | ESE 7 | ESE 12 | ESE 12 | SE 8 | SSE 5 | ENE 6 | ENE 8 | E 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 28 | 44 | 44 | 12 | 11 | 8 | 8 | 10 | 17 | 16 | 18 | 24 | 17 | 17 | 13 | 13 | 12 | 29 | 229 | 300 | 270 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross | on | cross-on | cross-off | cross-off | cross-off | cross | cross-on | cross-on | cross-off | cross-on | cross-on | cross-on | on | cross-on | on | cross | on | cross-off |
High Tide | 1:58PM3.48m | 2:28AM3.20m | 2:41PM3.35m | 3:14AM3.01m | 3:26PM3.20m | 4:03AM2.83m | 4:13PM3.04m | 4:55AM2.67m | 5:06PM2.92m | 5:53AM2.57m | 6:04PM2.84m | 6:54AM2.54m | 7:04PM2.82m | ||||||||
Low Tide | 8:17PM0.34m | 8:30AM0.62m | 9:03PM0.48m | 9:13AM0.80m | 9:51PM0.64m | 9:59AM0.97m | 10:42PM0.79m | 10:50AM1.12m | 11:39PM0.91m | 11:47AM1.21m | 00:39AM0.97m | 12:47PM1.23m | 1:37AM0.96m | ||||||||
 | |  | | | | |  | | |  |  | | |  | |  |  | | | | |
 | 6:20 | — | — | 6:22 | — | — | 6:22 | — | — | 6:24 | — | — | 6:24 | — | — | 6:26 | — | — | 6:26 | — | — |
 | — | 6:54 | — | — | 6:52 | — | — | 6:52 | — | — | 6:50 | — | — | 6:47 | — | — | 6:45 | — | — | 6:44 | — |
mm | — | — | — | — | — | — | — | — | — | — | 1 | 5 | — | — | — | — | — | 46 | — | — | — |
Temp °C | 19 | 20 | 18 | 13 | 14 | 14 | 19 | 26 | 25 | 18 | 15 | 18 | 21 | 22 | 20 | 15 | 15 | 15 | 14 | 15 | 16 |
Feels °C | 13 | 14 | 14 | 11 | 11 | 11 | 16 | 24 | 24 | 17 | 14 | 19 | 22 | 21 | 19 | 13 | 13 | 12 | 11 | 14 | 16 |
Swell 1 Height (m) Direction Period (s) | SE 9 | ESE 8 | SE 8 | SE 7 | ENE 6 | ENE 5 | ESE 9 | ESE 9 | SE 4 | ESE 7 | ENE 4 | E 7 | ESE 7 | ESE 7 | ESE 6 | ESE 7 | ESE 7 | SE 8 | SSE 6 | SSE 6 | E 8 |
| kJ | 28 | 44 | 29 | 7 | 11 | 2 | 8 | 8 | 9 | 10 | 8 | 24 | 17 | 17 | 8 | 9 | 9 | 16 | 13 | 3 | 270 |
Swell 2 Height (m) Direction Period (s) | — | SE 6 | E 15 | ESE 9 | SE 7 | ESE 9 | E 4 | SE 13 | ESE 7 | ESE 13 | ESE 7 | ESE 12 | ESE 12 | ESE 12 | ESE 12 | ESE 12 | SE 8 | ENE 4 | ESE 11 | SE 8 | — |
| kJ | — | 10 | 4 | 8 | 7 | 8 | 1 | 7 | 5 | 16 | 18 | 15 | 14 | 14 | 13 | 13 | 11 | 4 | 11 | 3 | — |
Swell 3 Height (m) Direction Period (s) | — | — | E 15 | E 15 | ESE 9 | SE 14 | SE 13 | SE 13 | ESE 13 | SE 9 | ESE 13 | ESE 9 | SE 9 | ESE 9 | ESE 8 | ESE 8 | ESE 11 | ESE 11 | SE 8 | — | — |
| kJ | — | — | 4 | 4 | 8 | 7 | 7 | 7 | 17 | 3 | 16 | 8 | 3 | 8 | 7 | 7 | 12 | 12 | 10 | — | — |
Wind waves Height (m) Direction Period (s) | NW 3 | NW 3 | NNE 5 | NE 5 | — | SSE 3 | SSW 3 | SSE 4 | — | NE 3 | NE 4 | — | — | NE 4 | — | ENE 2 | ENE 3 | SSE 5 | ENE 6 | ENE 8 | — |
| kJ | 4 | 2 | 44 | 12 | — | 3 | 3 | 10 | — | 7 | 5 | — | — | 1 | — | 1 | 2 | 29 | 229 | 300 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 338 | 5 | 38 | 501 | 618 | 618 | 1290 | 1290 | 247 | 126 | 957 | 609 | 247 | 276 | 880 | 917 | 620 | 787 | 186 | 38 | 0 |
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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