Surf Forecasts:
Costellos surf forecast from 25 Jul 2026:
- Best quality surf: Friday 31 Jul, 5AM (local time) - 5.5ft (1.7m), 7s period, ENE swell with offshore winds.
- Most powerful swell: Thursday 30 Jul, 5PM (local time) - 8ft (2.4m), 8s period, ENE swell with 640 kJ wave energy.
- Next surfable swell (1★+): Saturday 25 Jul, 5AM (local time) - 2.5ft (0.7m), 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 Saturday (Jul 25) at 5AM. The primary swell is predicted to be 0.7m and 8s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Costellos in the next 16 days are 2.4m 8s and forecast to arrive on Thursday (Jul 30) at 5PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 4s period and expected on Saturday (Jul 25) at 2AM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Sat 25th Jul) | 2.5ft (0.7m) 8s |
| Best Surf | 5AM (Fri 31st Jul) | 5.5ft (1.7m) 7s |
| Most Powerful | 5PM (Thu 30th Jul) | 8ft (2.4m) 8s |
Table - best surf conditions forecast for Costellos over the next 16 days.
The Lowdown
Alright, folks, Rusty here. We're only looking at one break for the next couple weeks, and that's Costellos. It's a reef, and it's an inconsistent spot, so when it's quiet, it's real quiet. And that's exactly what we've got.
The first few days, from July 25th through the 29th, it's barely a ripple. We're talking waves around 2ft to 3ft, and the wind is never on our side. Saturday the 25th has a cross-onshore breeze making a mess of it. Sunday through Tuesday the wind is either onshore or cross-onshore, and the wave energy is very weak, barely registering. It's small, choppy, and not worth getting wet for.
The first real pulse of energy hits on Thursday, July 30th. The swell jumps to 8ft from the E, with a short period of 7 seconds—so it's lumpy, wind-driven swell. The wind is a moderate cross-shore at 15 mph, creating a real cross-chop. The wave energy hits moderate levels, but the conditions are "marginal." This is not a day for beginners. With that wind and short period, it looks more like a kiteboarding day than a surfing day.
Friday, July 31st, we get a little window. The swell drops to 4ft from the ENE in the morning, and the wind turns light and cross-offshore from the NW. That's clean. The wave energy is weak, but the conditions are clean. Saturday, August 1st, the swell drops right back to 1ft. It's a false alarm.
The first week of August is a total bust. From the 1st to the 8th, we're seeing mostly tiny waves. There's a glimmer on Monday, August 3rd, with a 2ft swell and a gentle offshore wind, but it's just too small. Tuesday, August 4th, has a morning of flat, glassy conditions, but again, only 2ft. The wave energy is in the single digits. It's a real dry spell.
The best on offer in this whole outlook is the afternoon of Friday, July 31st, and it's a stretch. The swell is a tiny 3ft from the ENE with a 6-second period, so it's short and weak, but the wind goes cross-offshore and light, making it clean. The wave energy is only 118. For an inconsistent spot like this, that's about as good as it gets. Any other day, the swell is too small, or the wind is blowing the wrong way.
The long-range stuff from August 5th to August 9th is just flat. We're looking at waves under 2ft, with some glassy mornings but no energy to push them. It's a tough outlook for Costellos. Keep the board waxed and wait for the next one. Forecasts can always change.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Fri night, min 13°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 80mm), heaviest during Wed afternoon. Warm (max 22°C on Tue night, min 16°C on Mon night). Winds increasing (light winds from the S on Mon night, fresh winds from the NE by Wed night). | ||||||||||||||||||
Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | ||||||||||||||
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 7 | SE 7 | SE 7 | SE 7 | SE 7 | SE 7 | SE 7 | ESE 7 | ESE 7 | ESE 7 | SE 8 | SE 8 | SE 8 | E 8 | E 7 | ENE 4 | E 7 | ENE 8 | ENE 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 27 | 43 | 41 | 48 | 62 | 77 | 79 | 66 | 66 | 64 | 35 | 109 | 21 | 32 | 26 | 31 | 572 | 640 | 495 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-on | cross-on | glassy | on | on | cross-off | on | cross-on | cross-off | cross-on | cross-on | cross | on | cross-on | cross-on | cross | cross | cross |
High Tide | 8:17PM3.00m | 9:01AM2.65m | 9:07PM3.04m | 9:50AM2.70m | 9:54PM3.11m | 10:34AM2.77m | 10:39PM3.18m | 11:16AM2.86m | 11:21PM3.25m | 11:56AM2.94m | 00:02AM3.30m | 12:35PM3.02m | 00:42AM3.30m | ||||||
Low Tide | 2:50AM0.82m | 2:52PM1.08m | 3:39AM0.76m | 3:40PM1.03m | 4:24AM0.68m | 4:26PM0.96m | 5:07AM0.60m | 5:09PM0.87m | 5:47AM0.54m | 5:51PM0.80m | 6:26AM0.49m | 6:32PM0.74m | |||||||
 | | |  | | | | | | |  |  |  | |  |  | | | | |
 | — | 5:26 | — | — | 5:26 | — | — | 5:28 | — | — | 5:28 | — | — | 5:30 | — | — | 5:31 | — | — |
 | 8:13 | — | 8:12 | — | — | 8:10 | — | — | 8:09 | — | — | 8:08 | — | — | 8:07 | — | — | 8:06 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | — | 1 | 17 | 38 | 20 | 3 | 19 |
Temp °C | 23 | 22 | 21 | 19 | 18 | 18 | 17 | 18 | 19 | 18 | 20 | 21 | 22 | 18 | 17 | 17 | 17 | 16 | 17 |
Feels °C | 20 | 20 | 18 | 17 | 16 | 15 | 16 | 16 | 16 | 16 | 19 | 19 | 20 | 18 | 15 | 13 | 16 | 14 | 18 |
Swell 1 Height (m) Direction Period (s) | SSE 4 | SE 7 | SE 7 | SE 7 | SE 7 | SE 7 | SE 7 | ESE 7 | ESE 7 | ESE 7 | SE 8 | ESE 7 | SE 8 | E 8 | E 7 | SE 6 | — | SSE 8 | ENE 8 |
| kJ | 9 | 43 | 41 | 48 | 62 | 77 | 79 | 66 | 66 | 64 | 35 | 15 | 21 | 32 | 26 | 20 | — | 28 | 397 |
Swell 2 Height (m) Direction Period (s) | SE 7 | — | — | E 13 | E 13 | E 12 | — | — | — | — | ESE 7 | E 9 | ESE 6 | SE 8 | SE 7 | SE 9 | — | — | SSE 10 |
| kJ | 27 | — | — | 3 | 3 | 3 | — | — | — | — | 15 | 15 | 12 | 25 | 14 | 14 | — | — | 81 |
Swell 3 Height (m) Direction Period (s) | SSE 6 | — | — | — | — | — | — | — | — | — | ESE 9 | — | E 8 | — | SE 4 | SSE 7 | — | — | — |
| kJ | 4 | — | — | — | — | — | — | — | — | — | 17 | — | 13 | — | 2 | 5 | — | — | — |
Wind waves Height (m) Direction Period (s) | S 4 | — | SSE 3 | — | — | — | — | — | — | — | SSE 2 | SE 8 | SSE 4 | SSE 3 | ENE 3 | ENE 4 | E 7 | ENE 8 | ENE 7 |
| kJ | 7 | — | 1 | — | — | — | — | — | — | — | 1 | 109 | 15 | 1 | 2 | 31 | 572 | 640 | 495 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 38 | 493 | 957 | 0 | 186 | 1608 | 0 | 274 | 227 | 0 | 1742 | 534 | 642 | 386 | 321 | 165 | 44 | 46 | 3 |
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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