Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 15 Jul 2026:
- Most powerful swell: Wednesday 15 Jul, 4PM (local time) - 0.5ft (0.1m), 16s period, SW swell with 10 kJ wave energy.
Best Forecast Surf Conditions for Cable Bay (Porth Trecastell) this week:
The most powerful waves expected at Cable Bay (Porth Trecastell) in the next 16 days are 0.1m 16s and forecast to arrive on Wednesday (Jul 15) at 4PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 6s period and expected on Wednesday (Jul 22) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Wed 15th Jul) | 0.5ft (0.1m) 16s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s cookin’ for Cable Bay (Porth Trecastell) over the next couple of weeks.
Straight up, this is a rough outlook. We’re looking at a long, long stretch of flat, weak, or just plain poor surf. The first couple of days are a tease with tiny 0.3ft swells, but for the most part, the ocean is taking a nap. From Wednesday the 15th right through to the end of Wednesday the 23rd July, there’s basically nothing worth paddling out for. Wave energy is in the basement, mostly under 15 or even zero for long spells. The wind is often cross-off or cross-off, but when there’s no swell, it doesn’t matter.
The one tiny glimmer of hope is in the very last couple of days of the window. On Thursday morning the 30th of July, we finally see a pulse of energy. The swell bumps up to 4ft from the W, with a short period of 4 seconds, and the combined energy hits 78. It’s not gonna be pretty; that short period will be a bit of a mess, and with a SW wind at 12 mph blowing onshore, it’ll be choppy. This is really only for the dedicated, and even then, it’s a poor session. The water temp is a very warm 63°F for the first mention, which is “much warmer than normal” for the time of year—a proper tropical anomaly.
There are no standout days here. If you’re desperate, the Thursday morning on the 30th is the only time the swell gets above knee-high, but it’s a short-period, onshore wind slop. Honestly, for a spot that’s exposed to SW, this is a grim run. The wind is often decent, but the swell just isn’t there. This looks more like a kiteboarder’s situation than a surfer’s.
Rusty, signing off.
Short Range ForecastMostly dry. Warm (max 23°C on Wed morning, min 12°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 18°C on Sun afternoon, min 13°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | |||||||||||||||
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) | SW 16 | SW 16 | S 16 | SW 6 | SW 14 | SSW 7 | SSW 6 | SSW 6 | SW 12 | S 11 | S 11 | S 11 | S 11 | S 10 | N 5 | NNW 5 | NNW 5 | N 6 | NNW 5 | NNW 4 | N 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 10 | 10 | 7 | 1 | 8 | 8 | 4 | 6 | 6 | 2 | 2 | 2 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | glassy | cross-off | cross-off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 10:35AM4.00m | 10:51PM4.43m | 11:24AM3.99m | 11:39PM4.50m | 12:11PM3.90m | 00:25AM4.44m | 12:58PM3.76m | 1:12AM4.25m | 1:45PM3.57m | 2:00AM3.97m | 2:34PM3.37m | 2:51AM3.65m | 3:28PM3.18m | 3:49AM3.33m | |||||||
Low Tide | 5:21PM0.05m | 5:52AM-0.33m | 6:06PM0.03m | 6:39AM-0.31m | 6:51PM0.12m | 7:25AM-0.16m | 7:35PM0.30m | 8:10AM0.10m | 8:19PM0.55m | 8:56AM0.43m | 9:06PM0.83m | 9:44AM0.78m | 9:59PM1.11m | ||||||||
 | |  |  |  |  | | | | | | | | | | | | | | | | |
 | 5:07 | — | — | 5:09 | — | — | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — | 5:15 | — | — | 5:16 | — | — |
 | — | — | 9:37 | — | — | 9:37 | — | — | 9:36 | — | — | 9:34 | — | — | 9:32 | — | — | 9:31 | — | — | 9:30 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 23 | 23 | 23 | 22 | 20 | 21 | 21 | 18 | 16 | 17 | 16 | 17 | 18 | 16 | 15 | 17 | 16 | 18 | 19 | 17 |
Feels °C | 24 | 23 | 20 | 21 | 19 | 17 | 17 | 16 | 16 | 12 | 14 | 14 | 13 | 14 | 13 | 11 | 14 | 14 | 15 | 16 | 15 |
Swell 1 Height (m) Direction Period (s) | NE 4 | SW 6 | SSW 6 | SW 6 | SW 6 | SSW 7 | SSW 6 | SSW 6 | SW 6 | SW 6 | S 5 | S 11 | S 11 | S 10 | — | — | — | — | NNW 5 | — | — |
| kJ | 3 | 2 | 4 | 1 | 1 | 5 | 4 | 4 | 1 | 1 | 1 | 2 | 2 | 2 | — | — | — | — | 20 | — | — |
Swell 2 Height (m) Direction Period (s) | S 6 | SW 16 | SW 13 | — | SW 14 | SW 12 | S 12 | SW 12 | SW 12 | S 11 | S 11 | S 5 | — | — | — | — | — | — | — | — | — |
| kJ | 1 | 10 | 7 | — | 8 | 6 | 3 | 6 | 6 | 2 | 2 | 1 | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | SW 16 | S 13 | S 16 | SE 4 | S 7 | SW 14 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 10 | 3 | 5 | 1 | 1 | 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | NE 4 | NE 4 | — | NE 3 | NNE 3 | N 4 | NNW 3 | N 4 | NNW 5 | NNW 5 | N 6 | NNW 5 | NNW 4 | N 5 | NNW 5 | NNW 5 | N 6 | — | NNW 4 | N 4 |
| kJ | — | 4 | 6 | — | 5 | 3 | 7 | 4 | 4 | 43 | 56 | 77 | 18 | 14 | 22 | 45 | 33 | 77 | — | 7 | 7 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 322 | 178 | 221 | 317 | 211 | 260 | 329 | 1280 | 272 | 284 | 284 | 270 | 284 | 284 | 272 | 284 | 387 | 260 | 300 | 301 | 272 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
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Information about the Cable Bay (Porth Trecastell) Surf forecast
The above surf forecast table for Cable Bay (Porth Trecastell) provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Cable Bay (Porth Trecastell) can be found by selecting the local surf guide option on the grey menu. Our Cable Bay (Porth Trecastell) 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 (Cable Bay (Porth Trecastell)) 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 Cable Bay (Porth Trecastell) 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.
Are you planning a holiday in Anglesy? If you are looking for accommodation near Cable Bay, camping, hotels and holiday cottages in Anglesy, consider staying in Anglesey which is 4 km (2 miles) away. Other places in and around Anglesy where you can find information about places to rent, and car hire include Holyhead which is 14 km (9 miles) away, Bangor, Porthmadog and Llandudno.
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