Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 2 Aug 2026:
- Most powerful swell: Thursday 6 Aug, 7AM (local time) - 7ft (2.1m), 6s period, W swell with 322 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 6s and forecast to arrive on Thursday (Aug 06) at 7AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Monday (Aug 03) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7AM (Thu 6th Aug) | 7ft (2.1m) 6s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright, I'm not gonna sugarcoat it – the next couple of weeks are looking dead quiet for Cable Bay (Porth Trecastell). There's pretty much no rideable surf on the cards until we're well into the second week. It's one of those stretches where you might as well wax the board and leave it in the car, 'cause you won't be needing it.
The first little blip of energy shows up on Wednesday, August 5th. A fresh south-westerly breeze kicks up a lumpy 3ft onshore mess in the morning, with the combined energy at a weak 170. It's not surfable. The water is a touch warmer than usual for this time of year, but that's small comfort.
There's a bit more oomph on Thursday, August 6th, with a 6ft swell out of the west, but the wind is howling from the WNW at 19 mph, turning the ocean into a lumpy, cross-onshore disaster. The combined energy hits 224, but it's ugly, ugly energy. You'd be better off on a kite than a paddle board.
We then go into another long, flat gap. Nothing of note until we get to Wednesday, August 12th. A little bump of 3ft from the SSW appears, but the period is a short 4 seconds, and the wind is blowing straight onshore. That's a no-go.
The best we can hope for, and I say 'hope' loosely, is Saturday, August 15th. It's not a stand-out by any stretch, but it's the least bad. A 4ft south-west swell with a 5-second period, and the wind goes a light, cross-shore 9 mph from the north-west. It'll be a bit wobbly with some cross-chop, but for a local paddle on a log, it might just be doable. The combined energy is a paltry 53, so don't expect any power.
After that, Sunday, August 16th sees a bit more size, 5ft to 5ft, but the wind is back on it from the south-west and west, making it a messy, blown-out affair. It's a tough run, lads. It tends not to stay this flat forever, but for now, the forecasts are what they are.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Mon night. Warm (max 21°C on Mon morning, min 14°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Wed night. Very mild (max 19°C on Tue afternoon, min 13°C on Wed night). Winds decreasing (fresh winds from the W on Wed night, light winds from the W by Thu night). | |||||||||||||||||||
Sat 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | ||||||||||||||
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 5 | SW 4 | SSW 4 | SW 9 | W 10 | SW 9 | WSW 8 | SW 8 | S 4 | SSW 5 | SSW 6 | SSW 7 | SSW 5 | SW 7 | W 6 | W 5 | NW 4 | SW 5 | SW 5 | SW 4 |
Wave Graph  | ||||||||||||||||||||
 kJ | 3 | 4 | 1 | 3 | 3 | 3 | 7 | 11 | 18 | 33 | 148 | 93 | 71 | 262 | 224 | 69 | 17 | 10 | 6 | 5 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-off | cross-off | off | cross-on | cross-off | cross | cross-on | cross-on | cross-on | on | on | cross-on | cross-on | on | cross | cross-on | on | cross-on |
High Tide | 00:00AM4.10m | 12:20PM3.64m | 00:32AM4.05m | 12:54PM3.59m | 1:07AM3.94m | 1:32PM3.51m | 1:48AM3.77m | 2:18PM3.37m | 2:39AM3.55m | 3:15PM3.22m | 3:44AM3.33m | 4:28PM3.12m | ||||||||
Low Tide | 6:28PM0.40m | 6:57AM0.24m | 7:04PM0.48m | 7:33AM0.34m | 7:41PM0.62m | 8:12AM0.50m | 8:22PM0.79m | 8:55AM0.70m | 9:10PM0.99m | 9:47AM0.92m | 10:11PM1.16m | 10:55AM1.10m | 11:32PM1.22m | |||||||
 |  |  | | |  | |  | | | | | | | | | | |  | | |
 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:41 | — | — | 5:43 | — | — |
 | — | 9:13 | — | — | 9:12 | — | — | 9:09 | — | — | 9:07 | — | — | 9:06 | — | — | 9:04 | — | — | 9:01 |
mm | — | — | — | — | — | — | — | 2 | — | — | — | — | — | 1 | — | — | — | — | 1 | — |
Temp °C | 16 | 15 | 17 | 17 | 17 | 21 | 20 | 17 | 19 | 19 | 18 | 17 | 18 | 16 | 14 | 16 | 17 | 15 | 18 | 17 |
Feels °C | 13 | 13 | 15 | 14 | 15 | 19 | 17 | 16 | 16 | 16 | 15 | 11 | 13 | 11 | 9 | 12 | 14 | 12 | 13 | 15 |
Swell 1 Height (m) Direction Period (s) | NW 4 | — | SSW 4 | — | SW 8 | NE 5 | NNE 4 | N 4 | SW 8 | — | — | SSW 7 | SW 13 | S 13 | — | S 12 | SSW 6 | SW 5 | NW 4 | SW 4 |
| kJ | 2 | — | 1 | — | 3 | 6 | 2 | 2 | 10 | — | — | 93 | 7 | 3 | — | 3 | 12 | 10 | 3 | 4 |
Swell 2 Height (m) Direction Period (s) | W 9 | — | — | SW 9 | W 10 | SW 9 | WSW 8 | SW 8 | NNE 4 | — | — | — | — | — | — | SW 12 | SW 12 | NNW 4 | — | SW 12 |
| kJ | 2 | — | — | 3 | 2 | 3 | 7 | 11 | 2 | — | — | — | — | — | — | 6 | 6 | 4 | — | 5 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | S 4 | — | — | — | — | — | — | — | — | — | — | SW 12 | S 12 | — |
| kJ | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | 6 | 3 | — |
Wind waves Height (m) Direction Period (s) | SW 5 | SW 4 | — | — | NNE 4 | — | NNW 3 | — | S 4 | SSW 5 | SSW 6 | SW 7 | SSW 5 | SW 7 | W 6 | W 5 | NW 4 | WNW 4 | SW 5 | NW 3 |
| kJ | 3 | 4 | — | — | 13 | — | 1 | — | 18 | 33 | 148 | 77 | 71 | 262 | 224 | 69 | 17 | 7 | 6 | 5 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 363 | 256 | 256 | 256 | 158 | 179 | 185 | 158 | 272 | 284 | 118 | 277 | 277 | 541 | 329 | 506 | 186 | 316 | 282 | 282 |
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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