Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 24 Jul 2026:
- Most powerful swell: Sunday 26 Jul, 10AM (local time) - 4.5ft (1.3m), 5s period, WNW swell with 80 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 1.3m 5s and forecast to arrive on Sunday (Jul 26) at 10AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 5s period and expected on Friday (Jul 31) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Sun 26th Jul) | 4.5ft (1.3m) 5s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright, let's get into it. I've got to be straight with you.
Alright, look. I've been staring at the charts for Cable Bay (Porth Trecastrell) and, to be honest, it's a grim picture for the next couple of weeks. We're looking at a long, dry spell with barely a ripple. From now until the end of July, it's practically flat. The combined wave energy is sitting at zero or in single digits for days on end. You’ll see a little bump of 2ft on Saturday the 25th of July, but it's a short-period windswell of just 4 seconds and the wind is straight onshore. That's a washing machine, not a surf.
The water is a touch warmer than normal for this time of year at 62°, but that's small comfort when there's nothing to ride. This is a real bummer of a start.
We finally see a pulse of energy rolling in on Friday the 7th of August. The swell jumps to 7ft out of the SSW, with a period of 7 seconds and a combined energy of 394 – that's a solid kick of moderate to strong energy. The wind is light onshore, so it's going to be a bit lumpy, but at least there's something to paddle for. This is a bigger swell, over 8ft, so it's really only for the experienced crew. It's not a standout, but it's the best we've got.
Saturday the 8th of August holds that energy with a 6ft swell from the SW, also 7 seconds, and the combined energy is still a respectable 352. The wind stays light from the SW, so again, it's not perfectly clean, but it's rideable. The swell drops to 6ft in the afternoon.
So, if you're desperate, mark your calendar for that first weekend of August. It's a long way off, so don't hold your breath, but it's the only window where we might see a wave. Otherwise, the boards are staying in the shed. This is one of those stretches where the forecast can change, but right now, it’s a tough spell for the North Wales coast.
Rusty
Short Range ForecastLight rain (total 2mm), mostly falling on Sat night. Very mild (max 17°C on Fri afternoon, min 14°C on Sun night). Winds increasing (light winds from the WSW on Fri afternoon, fresh winds from the WNW by Sun morning). | Days 4-6 Weather SummaryMostly dry. Warm (max 20°C on Wed afternoon, min 15°C on Mon morning). Winds decreasing (fresh winds from the SSW on Tue morning, calm by Wed night). | ||||||||||||||||||||
Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | |||||||||||||||
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) | S 13 | S 13 | SW 3 | SW 4 | SW 5 | WSW 5 | WNW 5 | WNW 5 | NW 5 | NW 5 | SSW 3 | SSW 5 | SSW 4 | SSW 4 | SW 5 | SW 4 | SSW 4 | SW 4 | — | — | N 3 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3 | 3 | 3 | 15 | 53 | 27 | 80 | 66 | 43 | 22 | 8 | 48 | 22 | 39 | 26 | 4 | 1 | 1 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | on | on | cross-on | cross-on | cross | cross | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross | cross-on | cross-on | off |
High Tide | 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 | 10:49AM3.58m | 11:01PM4.02m | ||||||||
Low Tide | 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 | 5:13AM0.35m | 5:20PM0.43m | ||||||||
 | |  |  | |  | |  |  | | |  | | | | | | | | | | |
 | 5:20 | — | — | 5:22 | — | — | 5:24 | — | — | 5:24 | — | — | 5:26 | — | — | 5:28 | — | — | 5:30 | — | — |
 | — | — | 9:25 | — | — | 9:24 | — | — | 9:22 | — | — | 9:22 | — | — | 9:20 | — | — | 9:17 | — | — | 9:16 |
mm | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 17 | 16 | 16 | 17 | 17 | 16 | 17 | 17 | 15 | 17 | 16 | 18 | 18 | 17 | 19 | 20 | 18 | 19 | 19 | 17 |
Feels °C | 13 | 15 | 14 | 12 | 16 | 16 | 10 | 12 | 13 | 12 | 12 | 13 | 14 | 14 | 15 | 18 | 18 | 19 | 18 | 18 | 16 |
Swell 1 Height (m) Direction Period (s) | N 4 | NNW 4 | SW 3 | NW 4 | S 12 | S 11 | SW 5 | — | SW 6 | — | NNW 4 | — | — | — | — | SW 4 | SSW 4 | SW 4 | — | — | — |
| kJ | 3 | 1 | 3 | 5 | 3 | 2 | 18 | — | 5 | — | 2 | — | — | — | — | 4 | 1 | 1 | — | — | — |
Swell 2 Height (m) Direction Period (s) | S 13 | S 13 | — | S 12 | — | — | — | — | — | — | WNW 4 | — | — | — | — | — | — | — | — | — | — |
| kJ | 3 | 3 | — | 3 | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | WNW 3 | — | SW 4 | SW 5 | WSW 5 | WNW 5 | WNW 5 | NW 5 | NW 5 | SSW 3 | SSW 5 | SSW 4 | SSW 4 | SW 5 | — | — | — | — | — | N 3 |
| kJ | — | 1 | — | 15 | 53 | 27 | 80 | 66 | 43 | 22 | 8 | 48 | 22 | 39 | 26 | — | — | — | — | — | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1525 | 1078 | 261 | 381 | 381 | 261 | 574 | 181 | 185 | 256 | 261 | 261 | 256 | 261 | 256 | 294 | 258 | 285 | 285 | 287 | 296 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Cable Bay (Porth Trecastell) surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest