
Surf Forecasts:
Costellos surf forecast from 28 Jul 2026:
- Best quality surf: Tuesday 28 Jul, 2AM (local time) - 2ft (0.6m), 7s period, E swell with cross-offshore winds.
- Most powerful swell: Thursday 30 Jul, 11AM (local time) - 8ft (2.4m), 7s period, ENE swell with 540 kJ wave energy.
- Next surfable swell (1★+): Tuesday 28 Jul, 2AM (local time) - 2ft (0.6m), 7s period with E 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 Tuesday (Jul 28) at 2AM. The primary swell is predicted to be 0.6m and 7s period with a secondary swell of 0.5m and 8s. Another secondary swell of 0.4m and 3s 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 2.4m 7s and forecast to arrive on Thursday (Jul 30) at 11AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Tue 28th Jul) | 2ft (0.6m) 7s |
| Best Surf | 2AM (Tue 28th Jul) | 2ft (0.6m) 7s |
| Most Powerful | 11AM (Thu 30th Jul) | 8ft (2.4m) 7s |
Table - best surf conditions forecast for Costellos over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about the next 16 days. It’s a rough outlook, and I can’t sugarcoat it. We’re looking at a long dry spell with a single, very small window of hope right at the end.
We’re focused on Costellos, a reef break that’s known for being inconsistent. For the first week, from Tuesday the 28th of July through the start of August, it’s all bad news. The wind is mostly a messy cross-on, and the swell is either too small or, like on the 30th of July, when it hits 8ft from the east-northeast, the wind is ruining it. The combined energy hits (592), but with a short 7-second period, it’s just a lumpy, blown-out windswell. That Thursday is a kite surfer’s day, not a paddler’s. The water temperature is about normal for the season.
The middle of the forecast, from the 3rd of August, cleans up nicely with offshore winds, but the swell disappears. We’re talking tiny, knee-high waves at best, 1.0ft to 2ft. The energy readings are in the teens and twenties, basically flat.
The only real standout, and it’s a weak one, comes on Sunday the 9th of August. The early morning at Costellos is glassy with a light breeze, and the swell period stretches out to a very long 10 seconds. The swell is tiny, only 2ft from the east, but the combined energy bumps up to (64), and the report calls it “surfable waves but very ordinary conditions.” For a spot that’s been flat for weeks, that’s the best on offer. That long period groundswell might give you a few clean peelers on the reef, but don’t expect power.
After that, it’s back to small, clean, and flat for the rest of the second week. The 10th and 11th have good offshore winds, but no swell to ride.
So, the one and only highlight is the morning of Sunday the 9th of August. A glassy, long-period swell, even if it’s small. The rest of the 16 days is a washout. If you’re going to paddle out, that’s your best shot.
Rusty.
Short Range ForecastHeavy rain (total 23mm), heaviest during Wed morning. Warm (max 24°C on Tue afternoon, min 17°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Thu night. Warm (max 23°C on Sun morning, min 17°C on Thu night). Wind will be generally light. | ||||||||||||||||||
Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | ||||||||||||||
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) | E 7 | SE 8 | SSE 5 | SSE 5 | SE 6 | ESE 6 | SE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | SE 8 | SE 7 | SE 10 | SE 9 | SE 8 | SE 8 | SE 7 |
Wave Graph | |||||||||||||||||||
33 | 39 | 56 | 50 | 150 | 202 | 97 | 540 | 385 | 265 | 131 | 72 | 35 | 14 | 45 | 37 | 21 | 20 | 18 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross | on | cross-on | glassy | cross-on | cross | glassy |
High Tide | 10:39PM3.18m | 11:16AM2.86m | 11:21PM3.25m | 11:56AM2.94m | 00:02AM3.30m | 12:35PM3.02m | 00:42AM3.30m | 1:13PM3.08m | 1:22AM3.27m | 1:50PM3.12m | 2:02AM3.21m | 2:28PM3.16m | 2:43AM3.13m | ||||||
Low Tide | 5:07AM0.60m | 5:09PM0.87m | 5:47AM0.54m | 5:51PM0.80m | 6:26AM0.49m | 6:32PM0.74m | 7:03AM0.48m | 7:12PM0.70m | 7:39AM0.50m | 7:53PM0.68m | 8:16AM0.55m | 8:36PM0.67m | |||||||
— | 5:28 | — | — | 5:30 | — | — | 5:31 | — | — | 5:31 | — | — | 5:33 | — | — | 5:33 | — | — | |
8:09 | — | 8:08 | — | — | 8:07 | — | — | 8:06 | — | — | 8:05 | — | — | 8:04 | — | — | 8:02 | — | |
mm | — | — | 1 | 3 | 5 | 6 | 3 | 4 | 1 | 1 | — | — | — | — | — | — | — | — | 2 |
Temp °C | 19 | 23 | 24 | 22 | 19 | 19 | 19 | 18 | 17 | 17 | 17 | 19 | 17 | 19 | 19 | 19 | 23 | 23 | 22 |
Feels °C | 17 | 23 | 22 | 19 | 17 | 19 | 18 | 17 | 14 | 15 | 16 | 17 | 18 | 19 | 18 | 20 | 23 | 21 | 23 |
Swell 1 Height (m) Direction Period (s) | E 7 | SE 8 | E 7 | E 7 | — | — | SE 7 | SE 10 | SSE 9 | SE 10 | SE 10 | SE 9 | E 5 | SE 7 | SE 10 | SE 9 | SE 8 | SE 8 | SE 7 |
33 | 39 | 14 | 8 | — | — | 97 | 25 | 54 | 45 | 47 | 41 | 21 | 14 | 45 | 37 | 21 | 20 | 18 | |
Swell 2 Height (m) Direction Period (s) | SE 8 | E 7 | E 9 | E 8 | — | — | — | SSE 7 | — | — | — | — | SE 8 | SE 9 | NE 4 | S 11 | SE 9 | SE 9 | SE 9 |
28 | 24 | 6 | 6 | — | — | — | 27 | — | — | — | — | 35 | 14 | 1 | 2 | 3 | 3 | 13 | |
Swell 3 Height (m) Direction Period (s) | SSE 3 | E 10 | — | — | — | — | — | — | — | — | — | — | — | E 6 | E 5 | — | — | SSE 7 | S 8 |
3 | 7 | — | — | — | — | — | — | — | — | — | — | — | 2 | 2 | — | — | 5 | 1 | |
Wind waves Height (m) Direction Period (s) | S 3 | SSE 3 | SSE 5 | SSE 5 | SE 6 | ESE 6 | ENE 5 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | — | — | — | — | — | — | — |
3 | 3 | 56 | 50 | 150 | 202 | 97 | 540 | 385 | 265 | 131 | 72 | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 493 | 1909 | 384 | 289 | 186 | 44 | 39 | 44 | 168 | 163 | 186 | 5 | 165 | 126 | 38 | 493 | 1290 | 192 |
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.










