Surf Forecasts:
Costellos surf forecast from 5 Sep 2026:
- Best quality surf: Saturday 5 Sep, 8PM (local time) - 2.5ft (0.8m), 7s period, E swell with glassy winds.
- Most powerful swell: Sunday 6 Sep, 8AM (local time) - 4.5ft (1.3m), 7s period, ENE swell with 158 kJ wave energy.
- Next surfable swell (1★+): Saturday 5 Sep, 8PM (local time) - 2.5ft (0.8m), 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 Saturday (Sep 05) at 8PM. The primary swell is predicted to be 0.8m and 7s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Costellos in the next 16 days are 1.3m 7s and forecast to arrive on Sunday (Sep 06) at 8AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 6s period and expected on Thursday (Sep 10) at 2PM.
| Wave Type | Time (EDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Sat 5th Sep) | 2.5ft (0.8m) 7s |
| Best Surf | 8PM (Sat 5th Sep) | 2.5ft (0.8m) 7s |
| Most Powerful | 8AM (Sun 6th Sep) | 4.5ft (1.3m) 7s |
Table - best surf conditions forecast for Costellos over the next 16 days.
The Lowdown
Alright, let’s have a look at what’s on offer for Costellos. To be straight with you, it’s a pretty bleak 16-day run. The first real surfable day to even talk about doesn’t show up until late in the game, so we’re looking at a long, quiet wait.
Starting off, the outlook is a dead loss for the first week and a half. From Saturday the 5th right through to the middle of the month, it’s just a whole lot of nothing. Tiny, weak swell, mostly under 3 ft, with short periods that just don’t have any push. The combined swell energy is a measly 60 or less most days, which is basically flat. The water is sitting at 65°, which is pretty average for this time of year, so no surprises there.
The first little flicker of something happens on Wednesday the 16th of September. That afternoon, the swell jumps up to 5 ft, but it’s a short-period 6 seconds from the NE, and the combined energy is 179. It’s surfable, but it’s only ordinary. The wind is clean, though, so if you’re desperate, you might get a couple.
The real event, and the only standout in this whole stretch, lands on Thursday the 17th of September. That morning, the swell is pushing 8 ft from the ENE, with a period of 8 seconds. The combined energy is a massive 718 (strong wave energy). That’s a lot of water moving. It’s a reef break, so it’ll handle that size, but 8 ft is expert territory. The wind is cross-on, so it’ll be a bit lumpy, but with that much energy, it’ll be a serious session for the crew that knows what they’re doing. The afternoon eases slightly to 8 ft, but still powerful with 648 energy. If you’re not an experienced surfer, give this day a miss.
After that, things drop off quickly. The 18th and 19th see the swell fading back to 5 ft and 3 ft, but the wind turns onshore or stays on it, so it’s pretty ordinary again. By the 20th, it’s back to 3 ft and a fresh onshore breeze, making it a no-go.
So, the call is: wait for Thursday the 17th of September. That’s your one shot at some real power. Everything else is a waiting game.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Sat afternoon. Warm (max 26°C on Mon afternoon, min 13°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Wed afternoon. Warm (max 28°C on Thu afternoon, min 16°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Sat 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | ||||||||||||||
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) | E 7 | E 7 | E 8 | ENE 7 | E 10 | E 10 | E 9 | E 9 | E 9 | E 9 | S 4 | ESE 10 | SE 10 | S 6 | SSE 6 | S 6 | SE 10 | NE 5 | SE 10 | NE 4 |
Wave Graph  | ||||||||||||||||||||
 kJ | 60 | 89 | 58 | 51 | 30 | 29 | 28 | 16 | 15 | 14 | 9 | 10 | 16 | 129 | 68 | 23 | 15 | 25 | 14 | 29 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-off | cross | cross-off | cross-off | cross-off | off | glassy | cross-on | glassy | cross | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross |
High Tide | 6:24PM3.27m | 7:14AM2.88m | 7:32PM3.31m | 8:20AM2.98m | 8:37PM3.40m | 9:20AM3.14m | 9:37PM3.50m | 10:14AM3.30m | 10:32PM3.58m | 11:03AM3.45m | 11:23PM3.62m | 11:49AM3.55m | 00:11AM3.59m | |||||||
Low Tide | 00:59AM0.56m | 1:13PM0.83m | 2:05AM0.49m | 2:20PM0.73m | 3:06AM0.38m | 3:22PM0.58m | 4:01AM0.27m | 4:19PM0.42m | 4:51AM0.20m | 5:11PM0.29m | 5:38AM0.17m | 5:59PM0.21m | ||||||||
 |  |  | |  |  | | | | | |  | | | | | | |  |  | |
 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — |
 | 7:10 | — | — | 7:08 | — | — | 7:07 | — | — | 7:06 | — | — | 7:04 | — | — | 7:01 | — | — | 7:00 | — |
mm | 1 | 1 | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — | 1 | — |
Temp °C | 19 | 17 | 16 | 19 | 18 | 22 | 26 | 24 | 18 | 19 | 18 | 19 | 26 | 23 | 23 | 28 | 25 | 21 | 20 | 18 |
Feels °C | 17 | 18 | 15 | 16 | 17 | 19 | 23 | 20 | 18 | 17 | 17 | 19 | 24 | 20 | 20 | 26 | 24 | 19 | 16 | 14 |
Swell 1 Height (m) Direction Period (s) | E 7 | — | ENE 6 | ENE 7 | ENE 7 | E 10 | E 9 | E 9 | E 9 | E 9 | S 4 | SSE 3 | SE 10 | ESE 10 | SSE 6 | S 6 | SSE 6 | SSE 6 | NE 5 | SSE 6 |
| kJ | 60 | — | 57 | 51 | 30 | 29 | 28 | 16 | 15 | 14 | 6 | 1 | 16 | 10 | 68 | 23 | 15 | 8 | 10 | 4 |
Swell 2 Height (m) Direction Period (s) | N 4 | — | E 8 | E 8 | E 10 | NE 6 | ENE 5 | SE 8 | NNE 3 | SE 9 | E 9 | ESE 10 | E 9 | E 8 | SE 9 | SE 9 | SE 10 | SE 10 | SSE 6 | SE 9 |
| kJ | 1 | — | 58 | 20 | 30 | 10 | 3 | 3 | 1 | 3 | 6 | 10 | 2 | 1 | 14 | 14 | 15 | 15 | 4 | 3 |
Swell 3 Height (m) Direction Period (s) | — | — | — | E 11 | SE 9 | SE 9 | SE 9 | NE 5 | SE 9 | — | SE 10 | E 9 | — | — | — | — | — | — | SE 10 | SE 11 |
| kJ | — | — | — | 2 | 3 | 3 | 3 | 1 | 3 | — | 4 | 6 | — | — | — | — | — | — | 14 | 5 |
Wind waves Height (m) Direction Period (s) | — | E 7 | — | — | NW 2 | — | SW 2 | WNW 2 | WNW 2 | SSE 3 | S 4 | — | SSE 4 | S 6 | SW 4 | WNW 2 | NNW 2 | NE 5 | — | NE 4 |
| kJ | — | 89 | — | — | 1 | — | 1 | 1 | 1 | 3 | 9 | — | 8 | 129 | 4 | 1 | 1 | 25 | — | 29 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 2740 | 5 | 0 | 98 | 0 | 60 | 14 | 96 | 620 | 3535 | 808 | 870 | 1293 | 1691 | 588 | 198 | 133 | 14 | 192 | 186 |
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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