Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 23 Jul 2026:
- Most powerful swell: Sunday 26 Jul, 10AM (local time) - 3.5ft (1.0m), 5s period, WNW swell with 44 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 1.0m 5s and forecast to arrive on Sunday (Jul 26) at 10AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Monday (Jul 27) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Sun 26th Jul) | 3.5ft (1.0m) 5s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's brewing for the next couple of weeks at Cable Bay.
Well, I gotta be straight with you – it's a tough start. The opening days are looking pretty grim for a paddle. We’ve got a solid week of flat to tiny, sloppy conditions. The wind is mostly on it or cross, and any swell that shows up is just wind chop with no energy. The combined energy barely registers, often in the single digits. You’re better off checking the reports or polishing your board for the first week, because the wait is on.
The first sign of life doesn't arrive until Sunday, August 2nd. We see a jump in swell, with a 5ft to 6ft cross-shore swell from the WNW, but the energy is still moderate (around 281). It's a bit of a messy, cross-choppy affair, so it's not one to get too excited about. The water is sitting a touch warmer than normal for the time of year, which is a nice little bonus.
Now, here’s where it gets interesting. The real standout is shaping up for Monday, August 3rd. The morning brings a proper pulse of southwest groundswell, hitting 10ft with a period of 8 seconds. The combined energy is a hefty 957, so you know there's serious power behind it. The wind is forecast to be light offshore from the NE, promising clean, groomed faces. For the experienced surfer, this is the one to circle on the calendar. Just be aware, at this size it's strictly for the experts – the big dogs are out to play. The bay will be handling some serious water.
The afternoon of the 3rd settles down a bit with an 8ft swell, still clean with a cross-offshore breeze. The energy is still strong (610), but the forecast is a bit more marginal. After that, the swell fades quickly through the rest of the week into tiny, clean but flat conditions.
So, there you have it. A long wait for one proper window of juice. Keep your eyes on that Monday morning, August 3rd.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Sat morning. Very mild (max 17°C on Fri afternoon, min 13°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Tue afternoon. Very mild (max 18°C on Tue morning, min 13°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
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 | SW 3 | W 4 | WSW 5 | WSW 4 | WNW 5 | NW 4 | NW 4 | SW 5 | W 3 | SW 4 | SSW 4 | SW 4 | — | SW 3 | SSW 3 | — |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 3 | 3 | 3 | 19 | 39 | 17 | 44 | 14 | 22 | 1 | 1 | 14 | 9 | 3 | 0 | 2 | 1 | 0 |
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 | cross-on | cross-on | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | glassy | cross | off |
High Tide | 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 | — | — | — | — | — | — | 1 | — | 2 | — | — | — | — | — | — | — | 3 | — | — | — | — |
Temp °C | 15 | 16 | 15 | 15 | 17 | 16 | 15 | 17 | 17 | 16 | 17 | 16 | 14 | 16 | 16 | 18 | 18 | 18 | 19 | 20 | 17 |
Feels °C | 11 | 12 | 13 | 13 | 15 | 14 | 12 | 15 | 15 | 12 | 14 | 12 | 11 | 12 | 13 | 15 | 18 | 18 | 19 | 19 | 16 |
Swell 1 Height (m) Direction Period (s) | — | — | N 5 | N 4 | NNW 4 | — | S 12 | S 12 | — | SW 5 | SW 5 | SSW 5 | SW 5 | N 4 | — | — | — | — | — | — | — |
| kJ | — | — | 10 | 6 | 1 | — | 3 | 3 | — | 8 | 10 | 3 | 1 | 3 | — | — | — | — | — | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | S 13 | S 13 | — | — | — | — | — | — | — | — | W 3 | — | — | — | — | — | — | — |
| kJ | — | — | — | 3 | 3 | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | N 6 | N 5 | — | — | — | SW 3 | W 4 | WSW 5 | WSW 4 | WNW 5 | NW 4 | NW 4 | NW 4 | SW 2 | SW 4 | SSW 4 | SW 4 | — | SW 3 | SSW 3 | — |
| kJ | 62 | 47 | — | — | — | 3 | 19 | 39 | 17 | 44 | 14 | 22 | 14 | 1 | 14 | 9 | 3 | — | 2 | 1 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 277 | 1028 | 256 | 420 | 1075 | 850 | 381 | 381 | 244 | 399 | 187 | 172 | 256 | 261 | 256 | 256 | 256 | 256 | 261 | 333 | 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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