Surf Forecasts:
Costellos surf forecast from 31 Jul 2026:
- Best quality surf: Monday 3 Aug, 11PM (local time) - 4.5ft (1.4m), 6s period, SSE swell with cross-offshore winds.
- Most powerful swell: Monday 3 Aug, 11PM (local time) - 4.5ft (1.4m), 6s period, SSE swell with 160 kJ wave energy.
- Next surfable swell (1★+): Friday 31 Jul, 11AM (local time) - 2ft (0.6m), 10s 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 Friday (Jul 31) at 11AM. The primary swell is predicted to be 0.6m and 10s period with a secondary swell of 0.6m and 6s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Costellos in the next 16 days are 1.4m 6s and forecast to arrive on Monday (Aug 03) at 11PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Saturday (Aug 01) at 2AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Fri 31st Jul) | 2ft (0.6m) 10s |
| Best Surf | 11PM (Mon 3rd Aug) | 4.5ft (1.4m) 6s |
| Most Powerful | 11PM (Mon 3rd Aug) | 4.5ft (1.4m) 6s |
Table - best surf conditions forecast for Costellos over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s take a look at what’s cooking for the region. It’s a pretty quiet picture for the next two weeks, so don’t get your hopes up for anything firing. We’re looking at a long stretch of small, underwhelming surf with a few fleeting moments that are barely worth a mention.
The first half of the forecast is a total write-off. From Friday, July 31st right through to Thursday, August 6th, we’ve got tiny waves and most of the time the wind is a mess. There’s a few windows of glassy conditions, like Friday morning and Wednesday morning, but the swell is just too small to get excited about – we’re looking at 1ft to 2ft at best. The combined energy is weak, barely scratching into double digits (90 on Friday morning, dropping to as low as 15). The water is a bit colder than normal for this time of year, sitting at 64°F.
The only real standout, and I mean the only one that might get you out of bed, is Thursday afternoon, August 6th. The swell bumps up to 4ft from the SSE, and the combined energy finally climbs into three digits (144). The wind is light and cross-offshore, keeping it clean. The period is a short 5 seconds though, so it’s not going to be holding any real shape – it’s more of a choppy, lumpy line-up. This is the best on offer, but it’s barely passable.
After that, it’s back to the same old story. The rest of the run into mid-August is a long, drawn-out drought of tiny waves and onshore or cross-shore breezes. There’s a little bump of 4ft on Sunday afternoon, August 9th, but it’s cross-onshore and messy. Energy is still weak (89). The wave heights drop to 0.7ft or 1ft from the 14th onwards, with periods creeping up to 9-10 seconds but no size to push them. It’s a flat spell, plain and simple.
For a spot like Costellos, which is an inconsistent reef break that needs a proper SE swell, this is a tough run. The optimum swell direction is SE, and we get a bit of that, but it’s never enough. If you’re a beginner, stay home – the swell is tiny, not dangerous, but not worth the drive. For the experts, there’s nothing to get excited about either. The whole setup looks more like a dead zone than a surf zone this fortnight.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Sun afternoon, min 18°C on Fri morning). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 27mm), heaviest during Mon night. Warm (max 27°C on Mon afternoon, min 20°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | |||||||||||||||
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) | SSE 10 | SE 9 | SE 9 | SE 9 | SE 7 | SE 7 | SE 7 | SSE 5 | SSE 5 | SE 9 | SE 8 | SSE 7 | SSE 7 | SSE 7 | SE 6 | SE 6 | SE 7 | SSE 4 | SSE 5 | SSE 5 | SSE 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 64 | 41 | 39 | 39 | 13 | 14 | 12 | 52 | 28 | 27 | 17 | 110 | 64 | 38 | 19 | 9 | 15 | 28 | 26 | 91 | 48 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross | off | on | on | cross-off | cross | cross-on | cross | cross | cross-off | cross-off | on | cross-on | cross-off | glassy | cross-on | cross-off | cross-off | cross-off | cross-off |
High Tide | 1:13PM3.08m | 1:22AM3.27m | 1:50PM3.12m | 2:02AM3.21m | 2:28PM3.16m | 2:43AM3.13m | 3:08PM3.18m | 3:28AM3.04m | 3:51PM3.20m | 4:18AM2.95m | 4:41PM3.21m | 5:14AM2.87m | 5:36PM3.23m | ||||||||
Low Tide | 7:12PM0.70m | 7:39AM0.50m | 7:53PM0.68m | 8:16AM0.55m | 8:36PM0.67m | 8:54AM0.61m | 9:21PM0.67m | 9:35AM0.68m | 10:10PM0.67m | 10:22AM0.75m | 11:05PM0.67m | 11:15AM0.81m | 00:06AM0.64m | ||||||||
 |  |  |  | |  | | | | |  |  | | | | | | | | | | |
 | 5:31 | — | — | 5:33 | — | — | 5:33 | — | — | 5:35 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — |
 | — | 8:05 | — | — | 8:04 | — | — | 8:02 | — | — | 8:01 | — | — | 8:00 | — | — | 7:59 | — | — | 7:58 | — |
mm | — | — | — | — | — | — | — | — | — | — | 4 | 23 | — | — | — | — | — | — | — | 2 | — |
Temp °C | 20 | 23 | 22 | 20 | 21 | 22 | 26 | 27 | 26 | 24 | 27 | 21 | 23 | 24 | 23 | 24 | 26 | 25 | 23 | 24 | 25 |
Feels °C | 22 | 21 | 22 | 20 | 21 | 23 | 26 | 25 | 25 | 26 | 29 | 23 | 24 | 23 | 23 | 26 | 28 | 24 | 25 | 26 | 28 |
Swell 1 Height (m) Direction Period (s) | E 6 | SE 9 | SE 9 | SE 9 | SE 7 | S 4 | SE 7 | — | SE 7 | SSE 4 | SE 4 | SSE 7 | SSE 7 | SSE 7 | SE 6 | SE 6 | SE 7 | SE 8 | SE 8 | SSE 5 | SSE 6 |
| kJ | 26 | 41 | 39 | 39 | 13 | 13 | 12 | — | 8 | 6 | 6 | 110 | 64 | 38 | 19 | 9 | 11 | 3 | 3 | 51 | 48 |
Swell 2 Height (m) Direction Period (s) | SSE 10 | E 6 | SSW 4 | E 6 | SE 8 | SE 7 | SE 9 | — | SE 9 | SE 9 | SE 8 | — | E 9 | — | ENE 4 | SSE 7 | SE 8 | E 9 | E 9 | E 9 | E 11 |
| kJ | 64 | 18 | 4 | 1 | 11 | 14 | 12 | — | 3 | 27 | 17 | — | 2 | — | 7 | 5 | 3 | 2 | 2 | 2 | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | E 6 | E 6 | ENE 3 | ESE 9 | S 8 | — | S 8 | S 9 | — | — | E 9 | — | SE 9 | ENE 4 | — | — | E 11 | — | — |
| kJ | — | — | 3 | 1 | 1 | 8 | 5 | — | 1 | 2 | — | — | 2 | — | 3 | 1 | — | — | 2 | — | — |
Wind waves Height (m) Direction Period (s) | — | S 2 | SSW 4 | NE 3 | — | — | S 4 | SSE 5 | SSE 5 | — | — | — | ENE 4 | NE 4 | NE 4 | — | SE 7 | SSE 4 | SSE 5 | SSE 5 | WSW 3 |
| kJ | — | 1 | 9 | 1 | — | — | 9 | 52 | 28 | — | — | — | 11 | 21 | 9 | — | 15 | 28 | 26 | 91 | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 123 | 5 | 182 | 618 | 38 | 198 | 1290 | 618 | 1728 | 350 | 0 | 92 | 167 | 131 | 192 | 493 | 182 | 367 | 0 | 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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