Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 20 Jul 2026:
- Most powerful swell: Saturday 25 Jul, 4PM (local time) - 4ft (1.2m), 5s period, SW swell with 67 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 1.2m 5s and forecast to arrive on Saturday (Jul 25) at 4PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Sunday (Jul 26) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Sat 25th Jul) | 4ft (1.2m) 5s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Hey, Rusty here. Look, I've got to be straight with you – Cable Bay (Porth Trecastell) is looking at a proper flat spell over the next 16 days. The whole run from 20 July right through to 4 August is showing nothing but poor surf conditions, with waves barely registering – a few knee-high ripples at best, maybe 1–2 ft. The combined energy readings are all in the single digits or low teens, weak stuff. We've got a few days of cross-off winds here and there, but without any real swell to speak of, it's just a glassy lake. For a spot that's usually fairly consistent and exposed to SW swell, this is a bummer. The good news is that it tends not to stay this quiet for long – forecasts can change, and we might see something pop up. But for now, leave the boards at home. Rusty.
Short Range ForecastMostly dry. Very mild (max 18°C on Wed afternoon, min 11°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Sat morning. Very mild (max 19°C on Thu afternoon, min 12°C on Sat night). Winds increasing (calm on Thu night, fresh winds from the WSW by Sat morning). | ||||||||||||||||||||
Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | |||||||||||||||
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) | N 5 | NNW 5 | N 6 | NNW 5 | N 5 | N 7 | NNW 6 | NNW 5 | NNW 6 | N 5 | NW 2 | N 4 | S 13 | S 13 | SW 3 | NW 4 | SW 5 | SW 6 | SW 6 | SW 6 | SW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 4 | 3 | 4 | 4 | 67 | 34 | 6 | 1 | 1 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | glassy | cross-on | on | cross-on | on | on | cross-off | cross-off | cross | cross |
High Tide | 2:34PM3.37m | 2:51AM3.65m | 3:28PM3.18m | 3:49AM3.33m | 4:30PM3.04m | 4:56AM3.09m | 5:37PM2.97m | 6:08AM2.98m | 6:44PM3.01m | 7:16AM2.99m | 7:44PM3.13m | 8:13AM3.09m | 8:35PM3.31m | ||||||||
Low Tide | 9:06PM0.83m | 9:44AM0.78m | 9:59PM1.11m | 10:38AM1.10m | 11:03PM1.32m | 11:45AM1.31m | 00:23AM1.40m | 1:01PM1.37m | 1:39AM1.32m | 2:06PM1.28m | 2:38AM1.14m | 2:56PM1.10m | 3:23AM0.93m | ||||||||
 |  |  | | |  | | | | | | | | |  |  |  | | | | | |
 | 5:15 | — | — | 5:16 | — | — | 5:18 | — | — | 5:18 | — | — | 5:20 | — | — | 5:22 | — | — | 5:24 | — | — |
 | — | — | 9:31 | — | — | 9:30 | — | — | 9:29 | — | — | 9:28 | — | — | 9:25 | — | — | 9:24 | — | — | 9:22 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — |
Temp °C | 14 | 16 | 15 | 15 | 15 | 13 | 15 | 18 | 16 | 15 | 19 | 19 | 16 | 17 | 17 | 14 | 16 | 15 | 14 | 15 | 13 |
Feels °C | 11 | 13 | 13 | 12 | 12 | 11 | 11 | 15 | 14 | 13 | 18 | 19 | 13 | 15 | 15 | 9 | 14 | 14 | 9 | 11 | 11 |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | N 5 | N 4 | N 4 | S 13 | WNW 3 | — | NW 4 | S 12 | SW 6 | SW 6 | SW 6 | N 5 |
| kJ | — | — | — | — | — | — | — | — | — | 18 | 6 | 1 | 3 | 1 | — | 3 | 3 | 34 | 6 | 1 | 11 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | S 13 | — | S 12 | — | — | — | — | SW 6 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | — | 3 | — | — | — | — | 1 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | N 5 | NNW 5 | N 6 | NNW 5 | N 5 | N 7 | NNW 6 | NNW 5 | NNW 6 | NNW 5 | NW 2 | — | WNW 3 | — | SW 3 | SW 3 | SW 5 | NW 4 | NNW 6 | NNW 5 | — |
| kJ | 25 | 35 | 77 | 26 | 23 | 176 | 160 | 42 | 50 | 5 | 1 | — | 4 | — | 4 | 4 | 67 | 6 | 170 | 51 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 272 | 284 | 325 | 284 | 260 | 352 | 53 | 272 | 302 | 53 | 277 | 357 | 256 | 1525 | 1189 | 1563 | 574 | 333 | 44 | 185 | 181 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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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