Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 11 Sep 2026:
- Most powerful swell: Saturday 12 Sep, 4PM (local time) - 7ft (2.2m), 7s period, SW swell with 447 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 Saturday (Sep 12) 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 1.4m 5s period and expected on Wednesday (Sep 16) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Sat 12th Sep) | 7ft (2.2m) 7s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright, let me tell you, it's been a bit of a quiet one here at Cable Bay (Porth Trecastell). Honestly, looking at the whole 16-day window, there's really nothing good on offer until the very end. The first couple of weeks are a write-off. You've got onshore winds, mostly from the southwest, and messy, lumpy conditions with very little clean swell. There's a big gap of no fun until we get to the tail end.
Water temp is sitting at about 63°, which is a touch warmer than normal for now, so at least it won't be a shock to the system when you finally get in.
Now, the one and only standout is on September 23rd (Wednesday). The morning session looks like the best bet. We’re looking at a solid 10ft swell from the southwest, with a period of 8 seconds. The combined wave energy is strong at 1308, so there's plenty of power. The wind is light and cross-onshore, which should keep things relatively clean for the size. This is a big swell though, over 8ft, so this is strictly for the experts only – beginners, stay on the beach for this one. It's going to be big, powerful, and the sets will be thumping in. It’s a long way out, so keep an eye on the charts, but this is the only window that looks promising.
The afternoon of the 23rd drops to 8ft, but it gets a marginal call due to tides. The rest of the window after that goes tiny again, with no real quality to speak of.
It's been a tough stretch, but that one day on the 23rd might just be worth the wait. Keep your fingers crossed the forecast holds.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Thu afternoon. Very mild (max 18°C on Sat night, min 14°C on Thu night). Winds decreasing (fresh winds from the SSW on Thu afternoon, light winds from the WNW by Fri afternoon). | Days 5-7 Weather SummaryLight rain (total 9mm), mostly falling on Mon morning. Very mild (max 17°C on Sun afternoon, min 14°C on Tue night). Winds increasing (light winds from the SSW on Sun afternoon, fresh winds from the NW by Tue night). | |||||||||||||||||||
Thu 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | ||||||||||||||
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 | SW 7 | SW 6 | SW 6 | SSW 4 | SW 6 | SW 7 | SW 7 | SSW 6 | SSW 6 | SSW 4 | SW 5 | SSW 6 | SSW 6 | SW 6 | WNW 4 | SW 6 | SSW 6 | S 6 | NW 4 |
Wave Graph  | ||||||||||||||||||||
 kJ | 458 | 103 | 43 | 19 | 25 | 348 | 447 | 127 | 26 | 14 | 20 | 60 | 160 | 166 | 44 | 35 | 5 | 5 | 1 | 8 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross | cross-on | cross-on | on | on | on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross-off | cross | cross-on |
High Tide | 9:39PM4.37m | 10:06AM4.03m | 10:17PM4.51m | 10:42AM4.11m | 10:54PM4.52m | 11:16AM4.11m | 11:30PM4.39m | 11:50AM4.02m | 00:07AM4.16m | 12:24PM3.85m | 00:44AM3.84m | 1:00PM3.60m | 1:24AM3.48m | |||||||
Low Tide | 4:02PM0.12m | 4:31AM-0.30m | 4:43PM-0.03m | 5:10AM-0.34m | 5:22PM-0.06m | 5:48AM-0.24m | 5:59PM0.01m | 6:23AM-0.01m | 6:35PM0.19m | 6:58AM0.30m | 7:12PM0.44m | 7:33AM0.66m | 7:49PM0.75m | |||||||
 |  |  |  |  | |  | | | | | | | |  | | | | |  | |
 | — | — | 6:43 | — | — | 6:45 | — | — | 6:47 | — | — | 6:48 | — | — | 6:50 | — | — | 6:52 | — | — |
 | 7:46 | — | — | 7:44 | — | — | 7:42 | — | — | 7:38 | — | — | 7:37 | — | — | 7:35 | — | — | 7:31 | — |
mm | 3 | — | — | — | 1 | 3 | — | — | — | — | — | 4 | — | — | 3 | 1 | 1 | — | — | 6 |
Temp °C | 17 | 17 | 14 | 14 | 15 | 16 | 17 | 18 | 17 | 17 | 17 | 17 | 17 | 17 | 16 | 16 | 15 | 14 | 15 | 14 |
Feels °C | 12 | 13 | 11 | 12 | 9 | 10 | 14 | 18 | 16 | 15 | 16 | 15 | 13 | 13 | 14 | 13 | 10 | 8 | 10 | 9 |
Swell 1 Height (m) Direction Period (s) | — | SW 7 | SW 6 | SW 6 | — | — | — | SW 7 | SSW 6 | SSW 6 | — | — | — | SW 12 | SW 6 | SW 6 | SW 6 | SSW 6 | SW 5 | SW 6 |
| kJ | — | 103 | 43 | 19 | — | — | — | 127 | 26 | 14 | — | — | — | 6 | 44 | 15 | 5 | 4 | 1 | 1 |
Swell 2 Height (m) Direction Period (s) | — | — | — | NNW 4 | — | — | — | — | NW 4 | NNW 4 | — | — | — | — | — | — | S 11 | SW 11 | S 6 | — |
| kJ | — | — | — | 3 | — | — | — | — | 5 | 3 | — | — | — | — | — | — | 2 | 5 | 1 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 7 | WNW 4 | NW 4 | WNW 3 | SSW 4 | SW 6 | SW 7 | NW 4 | — | — | SSW 4 | SW 5 | SSW 6 | SSW 6 | WNW 4 | WNW 4 | NW 5 | NW 5 | NW 5 | NW 4 |
| kJ | 458 | 8 | 14 | 2 | 25 | 348 | 447 | 3 | — | — | 20 | 60 | 160 | 166 | 11 | 35 | 73 | 115 | 42 | 8 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 106 | 167 | 172 | 173 | 293 | 261 | 244 | 96 | 187 | 244 | 256 | 256 | 261 | 179 | 302 | 541 | 173 | 319 | 173 | 187 |
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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