Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 27 Aug 2026:
- Most powerful swell: Thursday 3 Sep, 7AM (local time) - 7ft (2.1m), 7s period, SW swell with 428 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 2.1m 7s and forecast to arrive on Thursday (Sep 03) at 7AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Saturday (Aug 29) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7AM (Thu 3rd Sep) | 7ft (2.1m) 7s |
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 on the table for the next couple of weeks.
Right off the bat, I've got to be straight with you – it's a quiet stretch ahead. Conditions are pretty tough for the foreseeable future, with a run of poor surf that's going to test the patience. The water temperature at Cable Bay (Porth Trecastell) is sitting at 64°F, which is a touch warmer than normal for this time of year, so you won't be needing a thick winter suit just yet.
The first solid window of opportunity doesn't show up until Saturday, September 5th, on the morning. That's a week away, so we've got a long gap of flat and messy days to get through before that. Even then, it's marginal. The swell bumps up to 6ft from the SW with a period of just 7 seconds, and the combined wave energy is moderate at 674. The wind is a gentle cross-onshore breeze, so it's going to be fairly choppy. It's a *maybe* session, not a guarantee.
No other day in the entire 16-day window gives a better look. The swell direction is SW, which is exactly what Cable Bay wants to see – it's an exposed spot that loves that direction. But the wind never really plays ball, and the short period means the waves won't have much punch or shape. It's a beach and reef setup, so with the combination of moderate swell, poor quality, and onshore wind, this might be more interesting for the kite surfers than those of us on a paddle board.
The rest of the run is a write-off. There are a few mornings with offshore winds, like on August 27th and September 6th, but the swell is barely a ripple – 0.3ft to 2ft – so you're not going anywhere. The crowds are listed as "sometimes" at Cable Bay, but honestly, with this forecast, you won't be fighting for a peak.
In short, wait for the 5th of September, keep your expectations low, and hope the forecasts change. That's the only one on the cards. Stay patient.
Rusty.
Short Range ForecastHeavy rain (total 21mm), heaviest during Thu afternoon. Very mild (max 17°C on Thu morning, min 15°C on Sat morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 7mm), mostly falling on Sun afternoon. Very mild (max 17°C on Sun morning, min 13°C on Tue night). Mainly fresh winds. | ||||||||||||||||||||
Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | |||||||||||||||
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) | SSW 7 | SSW 7 | SSW 7 | SW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 8 | SW 8 | SW 8 | SSW 7 | SW 8 | SW 8 | SSW 7 | W 5 | SW 6 | SW 6 | SW 5 | SW 16 | SSW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 6 | 4 | 4 | 10 | 22 | 54 | 62 | 68 | 126 | 57 | 32 | 78 | 93 | 62 | 46 | 77 | 29 | 8 | 7 | 10 | 170 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | glassy | cross-on | on | cross-on | cross-on | cross | cross-on | cross-on | cross-on | on | on | cross-on | cross-on | cross-on | on | cross-on | cross | cross-on | cross-on | cross-on |
High Tide | 10:04PM4.02m | 10:23AM3.73m | 10:32PM4.18m | 10:51AM3.84m | 11:00PM4.28m | 11:19AM3.92m | 11:30PM4.30m | 11:49AM3.93m | 00:03AM4.23m | 12:23PM3.87m | 00:40AM4.07m | 1:01PM3.73m | 1:22AM3.82m | ||||||||
Low Tide | 4:20PM0.46m | 4:45AM0.20m | 4:53PM0.30m | 5:18AM0.06m | 5:26PM0.21m | 5:52AM0.00m | 6:01PM0.20m | 6:27AM0.05m | 6:37PM0.27m | 7:03AM0.19m | 7:16PM0.42m | 7:43AM0.43m | 7:59PM0.63m | ||||||||
 |  |  | |  |  | |  |  | | | | | | | | |  |  | | | |
 | 6:16 | — | — | 6:18 | — | — | 6:20 | — | — | 6:22 | — | — | 6:24 | — | — | 6:26 | — | — | 6:28 | — | — |
 | — | 8:20 | — | — | 8:16 | — | — | 8:15 | — | — | 8:13 | — | — | 8:09 | — | — | 8:07 | — | — | 8:06 | — |
mm | 3 | 7 | — | 1 | 1 | 2 | 7 | — | — | 1 | 3 | — | — | — | 1 | — | 2 | — | — | — | 17 |
Temp °C | 17 | 17 | 16 | 17 | 17 | 16 | 17 | 17 | 15 | 17 | 16 | 15 | 15 | 16 | 16 | 16 | 17 | 16 | 13 | 15 | 17 |
Feels °C | 15 | 18 | 17 | 17 | 16 | 14 | 16 | 15 | 13 | 13 | 12 | 13 | 11 | 13 | 12 | 11 | 14 | 13 | 11 | 10 | 12 |
Swell 1 Height (m) Direction Period (s) | SSW 7 | NE 4 | SSW 7 | SW 6 | SSW 6 | — | SSW 6 | SSW 6 | SSW 8 | SW 8 | SW 8 | SSW 7 | SW 8 | SW 8 | SSW 7 | — | SW 6 | SW 6 | N 5 | NNW 4 | — |
| kJ | 5 | 5 | 4 | 10 | 22 | — | 62 | 68 | 126 | 57 | 32 | 78 | 93 | 62 | 46 | — | 29 | 8 | 12 | 4 | — |
Swell 2 Height (m) Direction Period (s) | SW 12 | SSW 7 | NNE 4 | N 3 | S 11 | S 11 | — | — | NNW 4 | — | — | — | — | NW 4 | — | — | — | — | SW 5 | SW 16 | — |
| kJ | 6 | 4 | 2 | 1 | 3 | 2 | — | — | 10 | — | — | — | — | 19 | — | — | — | — | 7 | 10 | — |
Swell 3 Height (m) Direction Period (s) | — | S 12 | S 12 | S 12 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 3 | — | — |
| kJ | — | 3 | 3 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — |
Wind waves Height (m) Direction Period (s) | ENE 5 | — | — | S 4 | — | SSW 6 | SE 3 | SW 6 | — | SSW 3 | SSW 4 | — | WNW 4 | WNW 4 | WNW 4 | W 5 | NW 5 | NNW 4 | — | SSW 3 | SSW 6 |
| kJ | 16 | — | — | 8 | — | 54 | 7 | 56 | — | 6 | 14 | — | 34 | 22 | 17 | 77 | 22 | 24 | — | 5 | 170 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 258 | 211 | 272 | 277 | 277 | 277 | 166 | 44 | 44 | 284 | 294 | 44 | 167 | 44 | 319 | 381 | 506 | 279 | 185 | 256 | 279 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Cable Bay (Porth Trecastell) surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest