Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 23 Jul 2026:
- Best quality surf: Sunday 26 Jul, 10AM (local time) - 3ft (0.9m), 4s period, WNW swell with cross-offshore winds.
- Most powerful swell: Saturday 25 Jul, 4PM (local time) - 3ft (0.9m), 5s period, WSW swell with 37 kJ wave energy.
- Next surfable swell (1★+): Sunday 26 Jul, 10AM (local time) - 3ft (0.9m), 4s period with WNW swell.
Best Forecast Surf Conditions for Cable Bay (Porth Trecastell) this week:
The surf forecast for Cable Bay (Porth Trecastell) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Jul 26) at 10AM. The primary swell is predicted to be 0.9m and 4s period with a secondary swell of 0.5m and 6s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Cable Bay (Porth Trecastell) in the next 16 days are 0.9m 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 1.1m 6s period and expected on Thursday (Jul 23) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10AM (Sun 26th Jul) | 3ft (0.9m) 4s |
| Best Surf | 10AM (Sun 26th Jul) | 3ft (0.9m) 4s |
| Most Powerful | 4PM (Sat 25th Jul) | 3ft (0.9m) 5s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s be straight with you – the outlook for Cable Bay (Porth Trecastell) over this 16-day stretch is about as flat as a millpond for the vast majority of it. We’ve got a long, long gap of nothing worth paddling out for. For the first ten days or so, it’s a real struggle, with wave heights barely scraping above 1 foot and the combined swell energy sitting in the weak zone (mostly single and low double digits). The wind is often onshore or cross-onshore, making a mess of things. It’s a grim start.
Finally, we see a little pulse around Sunday the 2nd of August, with a summary swell height hitting 4 feet from the NW. The combined energy gets into the moderate range at 112, but it’s still blowing a moderate cross-onshore breeze, so expect choppy, lumpy conditions. That’s not your standout session, trust me. The real highlight, and it’s a slim one, comes on Monday the 3rd of August. We’ve got a small 1.3 foot swell from the SW, but here’s the kicker – the wind swings around to a light NNW, giving us a clean, cross-off breeze. For a break that’s exposed to a SW optimum, a clean window like this is a rare treat. The combined swell energy is weak at 21, so it’ll be small and gutless, but if you’re desperate for a glide on a log, the morning of the 3rd is your only real shot. The water temp is about average for the time of year, so no surprise there. For the rest of the window, it’s a write-off. Stay tuned, forecasts can change, but right now, it’s a waiting game.
Short Range ForecastLight rain (total 3mm), mostly falling on Sat afternoon. Very mild (max 17°C on Wed night, min 13°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Sat night. Very mild (max 18°C on Tue afternoon, min 14°C on Mon morning). Winds increasing (light winds from the WNW on Sun night, fresh winds from the SSW by Tue morning). | ||||||||||||||||||||
Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | |||||||||||||||
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 6 | N 5 | N 5 | S 13 | S 13 | S 13 | W 4 | WSW 5 | WSW 4 | WNW 4 | NW 4 | NW 4 | WNW 4 | WNW 3 | SSW 4 | SSW 4 | SSW 4 | SW 4 | SW 4 | SSW 3 | SW 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 3 | 3 | 4 | 20 | 37 | 16 | 35 | 22 | 9 | 5 | 1 | 10 | 12 | 10 | 14 | 3 | 2 | 4 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | cross-on | on | on | on | on | cross-on | cross-off | cross | cross | cross-on | on | cross-on | cross-on | cross-on | cross-on | on | on | cross |
High Tide | 4:56AM3.09m | 5:37PM2.97m | 6:08AM2.98m | 6:44PM3.01m | 7:16AM2.99m | 7:44PM3.13m | 8:13AM3.09m | 8:35PM3.31m | 9:01AM3.24m | 9:19PM3.52m | 9:41AM3.38m | 9:56PM3.72m | 10:17AM3.50m | 10:30PM3.90m | |||||||
Low Tide | 11:45AM1.31m | 00:23AM1.40m | 1:01PM1.37m | 1:39AM1.32m | 2:06PM1.28m | 2:38AM1.14m | 2:56PM1.10m | 3:23AM0.93m | 3:37PM0.90m | 4:03AM0.71m | 4:13PM0.71m | 4:39AM0.51m | 4:47PM0.55m | ||||||||
 |  |  | | | |  |  |  | | | | | | | | |  | | | | |
 | 5:18 | — | — | 5:20 | — | — | 5:22 | — | — | 5:24 | — | — | 5:24 | — | — | 5:26 | — | — | 5:28 | — | — |
 | — | — | 9:28 | — | — | 9:25 | — | — | 9:24 | — | — | 9:22 | — | — | 9:22 | — | — | 9:20 | — | — | 9:17 |
mm | — | — | — | — | — | — | — | 3 | 6 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 17 | 15 | 14 | 17 | 16 | 15 | 15 | 15 | 16 | 16 | 16 | 15 | 17 | 16 | 17 | 18 | 17 | 19 | 20 | 18 |
Feels °C | 12 | 14 | 13 | 13 | 15 | 14 | 12 | 12 | 15 | 13 | 13 | 16 | 12 | 13 | 12 | 13 | 14 | 15 | 18 | 18 | 17 |
Swell 1 Height (m) Direction Period (s) | — | — | N 5 | N 4 | N 4 | — | S 12 | S 12 | S 11 | SW 6 | SW 6 | SW 6 | NNW 4 | N 4 | — | — | — | — | — | — | SW 4 |
| kJ | — | — | 18 | 6 | 1 | — | 3 | 3 | 2 | 15 | 8 | 5 | 6 | 3 | — | — | — | — | — | — | 4 |
Swell 2 Height (m) Direction Period (s) | — | — | — | S 13 | S 13 | S 13 | S 12 | — | — | — | — | — | SW 6 | WNW 3 | — | — | — | — | — | — | — |
| kJ | — | — | — | 3 | 3 | 3 | 3 | — | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | N 6 | N 5 | NNE 2 | — | — | WSW 3 | W 4 | WSW 5 | WSW 4 | WNW 4 | NW 4 | NW 4 | WNW 4 | SW 6 | SSW 4 | SSW 4 | SSW 4 | SW 4 | SW 4 | SSW 3 | — |
| kJ | 77 | 47 | 1 | — | — | 4 | 20 | 37 | 16 | 35 | 22 | 9 | 5 | 1 | 10 | 12 | 10 | 14 | 3 | 2 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 277 | 569 | 256 | 1078 | 1075 | 393 | 381 | 381 | 244 | 0 | 181 | 172 | 256 | 258 | 256 | 256 | 261 | 256 | 258 | 258 | 256 |
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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