Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 31 Aug 2026:
- Most powerful swell: Thursday 3 Sep, 7PM (local time) - 7ft (2.2m), 7s period, SW swell with 434 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 2.2m 7s and forecast to arrive on Thursday (Sep 03) at 7PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Saturday (Sep 05) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Thu 3rd Sep) | 7ft (2.2m) 7s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright, Rusty here. Let's talk about what's coming down the pipe.
It's a real bummer of a forecast for Cable Bay (Porth Trecastell). We're looking at a solid two-week stretch where there's nothing worth paddling for. The wind is almost always onshore or cross-onshore, and the swell is short-period, choppy junk. The water is sitting at 63.7°, which feels a touch warmer than normal for this time of year, but that's not going to help the waves.
The first real movement comes on September 15th. Tuesday morning shows a big push of 7.9ft swell from the SW, but it's wrapped in a strong breeze and light rain. The combined energy is strong at 640, but that's all onshore energy. That's a lot of water moving, but it's going to be a total mess. That afternoon, it drops to 6.2ft, but the wind is still howling. This setup is honestly more interesting for kite surfing than paddle surfing. The swell is too big and blown out for a good paddle session.
The only potential standout, and I'm using that word loosely, might be the last day of the forecast. On September 13th, Sunday afternoon, we see a 5.9ft swell from the SSW with a combined energy of 231. The wind is light from the SW, which is onshore, but if it stays light, it might be the least messy of a bad bunch. It's still a 5-second period, so it's going to be fat and weak. Don't expect much.
Bottom line: there's nothing to get excited about. It's a long, flat, and windy spell. The only chance for a wave is that last weekend, and even then, it's a gamble. The conditions are poor, and the swell is short and onshore. I'd wait for the next forecast cycle.
Short Range ForecastLight rain (total 8mm), mostly falling on Wed morning. Very mild (max 18°C on Wed night, min 14°C on Mon morning). Winds increasing (light winds from the WSW on Tue night, fresh winds from the SSW by Wed afternoon). | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Thu afternoon. Very mild (max 17°C on Thu morning, min 14°C on Fri morning). Winds decreasing (strong winds from the WSW on Fri morning, light winds from the SSW by Sat afternoon). | ||||||||||||||||||||
Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 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) | WNW 5 | SW 8 | SSW 7 | SW 4 | SSW 5 | SW 5 | SSW 5 | SSW 6 | SW 6 | SW 5 | SSW 6 | SW 7 | WSW 6 | SW 6 | W 6 | NW 6 | WSW 4 | SW 4 | SSW 4 | SSW 5 | SW 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 87 | 50 | 21 | 16 | 61 | 39 | 69 | 179 | 181 | 106 | 319 | 207 | 299 | 223 | 192 | 100 | 14 | 14 | 35 | 66 | 119 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | on | on | cross-on | cross-on | cross-on | on | on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 11:49AM3.93m | 00:03AM4.23m | 12:23PM3.87m | 00:40AM4.07m | 1:01PM3.73m | 1:22AM3.82m | 1:47PM3.51m | 2:14AM3.50m | 2:44PM3.26m | 3:24AM3.18m | 4:06PM3.08m | 5:04AM3.02m | 5:48PM3.13m | ||||||||
Low Tide | 6:37PM0.27m | 7:03AM0.19m | 7:16PM0.42m | 7:43AM0.43m | 7:59PM0.63m | 8:28AM0.72m | 8:50PM0.88m | 9:25AM1.02m | 9:57PM1.11m | 10:40AM1.25m | 11:26PM1.19m | 12:11PM1.26m | 00:57AM0.99m | ||||||||
 |  |  |  |  |  | | |  | | |  | | | | | | | | | | |
 | 6:24 | — | — | 6:26 | — | — | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — | 6:33 | — | — | 6:35 | — | — |
 | — | 8:09 | — | — | 8:07 | — | — | 8:06 | — | — | 8:02 | — | — | 8:00 | — | — | 7:59 | — | — | 7:55 | — |
mm | — | — | — | — | 1 | 2 | 5 | — | — | 1 | 4 | 3 | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 16 | 16 | 15 | 17 | 17 | 17 | 17 | 18 | 17 | 17 | 17 | 16 | 17 | 16 | 14 | 15 | 15 | 15 | 16 | 16 |
Feels °C | 9 | 12 | 13 | 11 | 12 | 16 | 13 | 12 | 16 | 14 | 13 | 12 | 9 | 10 | 10 | 9 | 13 | 13 | 9 | 9 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SW 8 | SSW 7 | — | — | — | SW 16 | SW 16 | SW 15 | — | — | SW 14 | — | SW 14 | SW 14 | SW 6 | NNW 5 | NNW 5 | SW 13 | SW 13 | — |
| kJ | 62 | 50 | 21 | — | — | — | 10 | 10 | 9 | — | — | 8 | — | 8 | 8 | 20 | 23 | 2 | 7 | 6 | — |
Swell 2 Height (m) Direction Period (s) | — | N 5 | NNW 4 | — | — | — | — | — | — | — | — | — | — | — | — | SW 14 | SW 13 | SW 13 | — | — | — |
| kJ | — | 7 | 4 | — | — | — | — | — | — | — | — | — | — | — | — | 7 | 7 | 7 | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 13 | SW 13 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 7 | 7 | — | — | — |
Wind waves Height (m) Direction Period (s) | WNW 5 | WNW 4 | W 3 | SW 4 | SSW 5 | SW 5 | SSW 5 | SSW 6 | SW 6 | SW 5 | SSW 6 | SW 7 | WSW 6 | SW 6 | W 6 | NW 6 | WSW 4 | SW 4 | SSW 4 | SSW 5 | SW 5 |
| kJ | 87 | 23 | 6 | 16 | 61 | 39 | 69 | 179 | 181 | 106 | 319 | 207 | 299 | 223 | 192 | 100 | 14 | 14 | 35 | 66 | 119 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 541 | 44 | 44 | 284 | 302 | 256 | 269 | 298 | 302 | 283 | 287 | 313 | 469 | 541 | 506 | 181 | 44 | 172 | 231 | 295 | 261 |
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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