Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 1 Aug 2026:
- Most powerful swell: Tuesday 4 Aug, 10PM (local time) - 3.5ft (1.1m), 6s period, SSW swell with 74 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 1.1m 6s and forecast to arrive on Tuesday (Aug 04) at 10PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s 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 | 10PM (Tue 4th Aug) | 3.5ft (1.1m) 6s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Right then, folks. Rusty here. Let’s have a look at what’s on offer for Cable Bay (Porth Trecastell).
Honestly, I’ve got to be straight with you – the next 16 days are a real struggle for this spot. We’re looking at a long, dry spell with hardly any waves to speak of. The forecast is pretty much a write-off for any decent paddling, so if you’re desperate for a surf, you might want to find something else to do for a while.
The first hint of anything that isn't completely flat doesn't come around until Monday the 10th of August. That morning, we finally see a tiny bit of energy, with a weak 2ft of swell from the SW, but the combined energy is still only 70 – that's weak. The wind is a cross-offshore from the NNW, which keeps the surface clean, and the forecast just calls it "surfable waves but very ordinary conditions." It’s a slight improvement, but it’s nothing to get excited about.
After that, it’s right back to the doldrums. The rest of the second week is a mess of onshore winds and tiny, non-existent swell. There’s no standout session, no hidden gem. The best you can say is that the water temperature is a touch warmer than normal for this time of year, sitting at 62°, but that’s small comfort.
So, the bottom line: there’s nothing here worth getting the wetsuit on for. The entire 16-day window is a bust. The only good news is that blank runs like this are pretty normal for the area, and the forecasts can change, so don’t lose all hope.
Rusty.
Short Range ForecastMostly dry. Very mild (max 19°C on Sun afternoon, min 13°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Mon night. Warm (max 20°C on Mon afternoon, min 14°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Fri 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | ||||||||||||||
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 3 | SW 5 | SW 5 | SW 5 | SW 4 | SSW 4 | SW 9 | SW 10 | SW 9 | WSW 8 | SW 8 | SW 8 | SW 8 | SSW 6 | SSW 6 | SSW 7 | SSW 7 | SW 7 | SW 6 | SSW 6 |
Wave Graph  | ||||||||||||||||||||
 kJ | 4 | 25 | 7 | 3 | 4 | 3 | 3 | 4 | 3 | 7 | 11 | 10 | 9 | 68 | 51 | 38 | 32 | 22 | 10 | 6 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | on | cross-on | glassy | cross-off | off | glassy | cross | glassy | cross-off | on | cross-on | on | cross-on | cross-off | cross-off | cross-off | off |
High Tide | 11:31PM4.09m | 11:49AM3.65m | 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 | |||||||
Low Tide | 5:54PM0.38m | 6:22AM0.21m | 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 | |||||||
 |  | | |  |  |  |  | | |  |  | |  | | | | | | | |
 | — | — | 5:33 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:41 | — | — |
 | — | 9:15 | — | — | 9:13 | — | — | 9:12 | — | — | 9:09 | — | — | 9:07 | — | — | 9:06 | — | — | 9:04 |
mm | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | 1 | — | — | — | — | — | — |
Temp °C | 17 | 17 | 14 | 15 | 15 | 18 | 19 | 17 | 19 | 20 | 18 | 17 | 18 | 19 | 18 | 17 | 15 | 15 | 17 | 15 |
Feels °C | 13 | 15 | 11 | 12 | 12 | 16 | 17 | 15 | 18 | 18 | 17 | 16 | 16 | 18 | 16 | 16 | 15 | 13 | 14 | 13 |
Swell 1 Height (m) Direction Period (s) | WNW 3 | SW 5 | SW 5 | NW 3 | — | SSW 4 | — | SW 8 | NE 5 | NNE 4 | SW 8 | SW 8 | SW 8 | — | SSW 6 | SSW 7 | SSW 7 | SW 7 | SW 6 | SSW 6 |
| kJ | 1 | 25 | 6 | 2 | — | 1 | — | 3 | 3 | 2 | 11 | 10 | 9 | — | 51 | 38 | 32 | 22 | 10 | 4 |
Swell 2 Height (m) Direction Period (s) | — | — | — | W 9 | — | SW 8 | SW 9 | SW 10 | SW 9 | WSW 8 | NNE 4 | NNE 4 | NE 4 | — | — | — | S 13 | — | N 4 | SW 12 |
| kJ | — | — | — | 2 | — | 3 | 3 | 4 | 3 | 7 | 2 | 2 | 1 | — | — | — | 3 | — | 2 | 6 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SE 4 | — | — | — | — | — | — | S 13 | — | — | S 12 | SW 12 |
| kJ | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | 3 | — | — | 3 | 6 |
Wind waves Height (m) Direction Period (s) | SW 3 | WNW 3 | NW 4 | SW 5 | SW 4 | — | — | NE 3 | — | — | — | — | S 2 | SSW 6 | — | — | N 3 | NW 4 | WNW 3 | N 4 |
| kJ | 4 | 4 | 7 | 3 | 4 | — | — | 5 | — | — | — | — | 1 | 68 | — | — | 1 | 12 | 2 | 2 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 541 | 302 | 352 | 352 | 287 | 256 | 256 | 158 | 150 | 185 | 172 | 283 | 44 | 279 | 262 | 44 | 172 | 176 | 345 | 316 |
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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