
Surf Forecasts:
Costellos surf forecast from 12 Jul 2026:
- Best quality surf: Monday 13 Jul, 11PM (local time) - 4.5ft (1.3m), 6s period, S swell with cross-offshore winds.
- Most powerful swell: Monday 13 Jul, 8PM (local time) - 5ft (1.6m), 6s period, S swell with 171 kJ wave energy.
- Next surfable swell (1★+): Monday 13 Jul, 11PM (local time) - 4.5ft (1.3m), 6s 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 Monday (Jul 13) at 11PM. The primary swell is predicted to be 1.3m and 6s period with a secondary swell of 0.2m and 10s. Another secondary swell of 0.1m 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 1.6m 6s and forecast to arrive on Monday (Jul 13) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Tuesday (Jul 14) at 2AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Mon 13th Jul) | 4.5ft (1.3m) 6s |
| Best Surf | 11PM (Mon 13th Jul) | 4.5ft (1.3m) 6s |
| Most Powerful | 8PM (Mon 13th Jul) | 5ft (1.6m) 6s |
Table - best surf conditions forecast for Costellos over the next 16 days.
G’day surfers, Rusty here. We’ve got a sixteen-day window on the cards and, well, it’s a pretty bleak stretch for the most part. There’s hardly any surf to get excited about for the first eleven days, with only tiny, weak waves on offer. The real kicker is the lack of any decent swell energy, and most of the time the conditions just aren't coming together. We’re in for a long wait, so don’t bother paddling out until the very tail end of the forecast.
Right now, starting from Sunday the 12th of July, it’s flat and messy at Costellos – just 1.0 ft of weak SE swell with a period of 10 seconds, but a cross-on wind from the SSE at 12 mph makes it choppy and hopeless. The water temp is 67°, which is a touch warmer than average for this time of year. Through the whole of the first week and into the next, we’re looking at a string of days with swell heights barely scratching 1.0 ft to 2 ft, with combined wave energy values sitting in the teens and twenties – that’s a combined energy of about 20 to 30 (weak). It’s all just a whole lot of nothing. There are a few afternoons with offshore wind, like Tuesday the 14th of July afternoon with a clean 2 ft from the S, but the swell is too small to bother with.
Now, around Monday the 20th of July, there’s a spike in size – we see 7 ft on the Monday afternoon from the SSE, with the combined energy jumping to 297 (moderate). But don’t get your hopes up. The period is short at 6 seconds, it’s cross-on shore, and the whole thing looks like a crumbly, messy mess. That kind of size with that wind and period is more of a kiter’s playground than a surfer’s dream. It’s punchy but poor quality.
The best we can find in this entire outlook falls right at the end. On Thursday the 23rd of July afternoon, things finally clean up. We get 2 ft of swell from the ESE, with a 7-second period, and a clean offshore wind from the WNW at 9 mph. The combined wave energy is still modest at 78 (weak), but the conditions are described as “surfable waves but very ordinary conditions” with a score of 1. It’s not a standout by any stretch, but it’s the only window where you could potentially get a few clean little waves to yourself. This run continues through Friday the 24th and Saturday morning the 25th of July, with similar 2 ft to 2 ft swells from the E and clean cross-off winds. Crowds are ‘often’ at Costellos, so expect a few others waiting for the same crumbs.
Truth be told, there’s no real standout session here. The only half-decent call is the Thursday afternoon through Saturday morning window (23rd to 25th of July) at Costellos – a reef break that is inconsistent and rarely pumps, but with a clean offshore breeze and tiny but clean waves, it’s the best we’ve got. Swell is from the ESE to E, so small but lined up. For the most part, though? Leave the boards in the car and come back another week.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Mon night. Warm (max 34°C on Tue afternoon, min 19°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 32°C on Wed afternoon, min 15°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Sun 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | SE 10 | SE 10 | SE 10 | SSE 5 | SE 9 | SE 9 | S 5 | SSE 7 | SE 9 | SE 9 | ESE 9 | ESE 9 | SE 15 | SE 15 | SE 14 | SE 14 | SSE 7 | ESE 13 | ESE 13 | ESE 13 | SE 7 |
Wave Graph | |||||||||||||||||||||
15 | 15 | 23 | 109 | 14 | 13 | 15 | 47 | 12 | 12 | 7 | 7 | 9 | 9 | 8 | 8 | 8 | 18 | 17 | 17 | 13 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | cross-off | cross-off | cross-off | off | cross-off | off | cross-off | cross-off | off | cross-off | off | cross-off | cross-on |
High Tide | 9:59PM3.70m | 10:42AM3.25m | 10:56PM3.82m | 11:38AM3.38m | 11:52PM3.89m | 12:32PM3.48m | 00:47AM3.88m | 1:25PM3.52m | 1:40AM3.79m | 2:16PM3.52m | 2:33AM3.64m | 3:07PM3.46m | 3:26AM3.43m | ||||||||
Low Tide | 3:41PM0.55m | 4:30AM0.11m | 4:40PM0.43m | 5:26AM-0.02m | 5:37PM0.33m | 6:19AM-0.08m | 6:32PM0.27m | 7:11AM-0.08m | 7:27PM0.26m | 8:02AM0.00m | 8:21PM0.30m | 8:52AM0.15m | 9:15PM0.40m | 9:41AM0.34m | |||||||
— | — | 5:15 | — | — | 5:16 | — | — | 5:16 | — | — | 5:18 | — | — | 5:18 | — | — | 5:18 | — | — | 5:20 | |
8:22 | — | — | 8:21 | — | — | 8:20 | — | — | 8:20 | — | — | 8:19 | — | — | 8:17 | — | — | 8:17 | — | 8:16 | |
mm | — | — | — | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 24 | 22 | 26 | 28 | 25 | 28 | 34 | 32 | 28 | 32 | 26 | 26 | 27 | 22 | 19 | 22 | 22 | 24 | 25 | 23 | 22 |
Feels °C | 21 | 19 | 25 | 25 | 24 | 27 | 33 | 31 | 27 | 29 | 27 | 21 | 21 | 18 | 14 | 17 | 19 | 19 | 21 | 23 | 21 |
Swell 1 Height (m) Direction Period (s) | SE 10 | SE 10 | SE 10 | SE 9 | SE 9 | SE 9 | S 5 | SSE 7 | SSE 6 | SE 9 | SSE 6 | SSW 3 | NE 3 | SSE 5 | SE 8 | SE 8 | SSE 7 | SE 7 | SE 7 | SE 7 | SE 7 |
15 | 15 | 23 | 14 | 14 | 13 | 15 | 47 | 10 | 12 | 3 | 1 | 2 | 3 | 3 | 3 | 5 | 8 | 8 | 8 | 13 | |
Swell 2 Height (m) Direction Period (s) | E 7 | E 7 | E 7 | — | E 8 | E 7 | SE 9 | ESE 9 | SE 9 | SSE 5 | ESE 9 | ESE 9 | SE 9 | SE 9 | SSE 5 | SE 5 | SE 14 | ESE 13 | ESE 13 | SSE 3 | SE 13 |
4 | 1 | 4 | — | 1 | 1 | 13 | 8 | 12 | 3 | 7 | 7 | 3 | 3 | 2 | 1 | 8 | 18 | 17 | 1 | 7 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | E 7 | — | E 16 | — | E 16 | SSE 5 | SE 15 | SE 15 | SE 14 | SE 14 | SE 5 | — | — | ESE 13 | E 13 |
— | — | — | — | — | — | 1 | — | 5 | — | 5 | 3 | 9 | 9 | 8 | 8 | 1 | — | — | 17 | 3 | |
Wind waves Height (m) Direction Period (s) | SSE 2 | S 3 | S 3 | SSE 5 | S 5 | SSW 5 | WSW 3 | W 3 | ENE 2 | S 3 | — | — | SSE 5 | NNW 2 | NW 3 | NW 2 | NW 3 | WNW 3 | — | — | — |
1 | 3 | 5 | 109 | 54 | 25 | 5 | 5 | 1 | 1 | — | — | 5 | 1 | 1 | 1 | 2 | 1 | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 618 | 620 | 620 | 1049 | 1049 | 642 | 401 | 0 | 182 | 182 | 227 | 1912 | 425 | 247 | 493 | 525 | 493 | 493 | 2883 | 199 | 232 |
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.











