Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 24 Jul 2026:
- Most powerful swell: Sunday 26 Jul, 10AM (local time) - 5ft (1.5m), 5s period, WNW swell with 117 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 1.5m 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 0.5m 4s period and expected on Thursday (Jul 30) at 4PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Sun 26th Jul) | 5ft (1.5m) 5s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright, Rusty here again. Let's break down the same outlook in the old school numbers.
It's looking pretty bleak, mates. A whole lot of flat, choppy days ahead. The first chance of anything even worth looking at doesn't come until the 1st of August, and that's a real maybe.
The main break we're watching is Cable Bay (Porth Trecastell). It's exposed to a SW swell, so it needs that direction to work. The water's at 62°F, which is a touch warmer than usual for the season.
For the first week, from Friday the 24th of July, it's a total write-off. Tiny swells and onshore winds. On the 26th, we see a 5 ft swell from the WNW, but it's short period and cross-onshore, so it's just a choppy mess. Combined energy is (117), but it's not going to be clean.
The 1st of August morning has a 2 ft swell from the SW with an 8-second period and a combined energy of (70). It's described as "marginal," so maybe, just maybe, with light winds, you could get a tiny little wave. The 2nd of August morning is clean with a light offshore wind, but the swell is only 1 ft, so it's essentially flat.
The only real bump in energy is on the 5th of August. Wednesday morning shows a 5 ft swell from the SSW with a combined energy of (170), and it backs off to 4 ft in the afternoon with a combined energy of (237). That's the biggest swell of the whole 16 days. But the period is a short 6 seconds, and the winds are cross-on. That's windswell, not a proper groundswell, so it's going to be lumpy and messy. It's a setup that looks more interesting for kiting than paddle surfing. That 5 ft is also too big for beginners.
So, the pick of a bad bunch? The 5th of August, but it's a long way off and the quality is poor. The 1st of August is a long shot. Keep your expectations low.
Rusty out.
Short Range ForecastLight rain (total 2mm), mostly falling on Sat night. Very mild (max 17°C on Fri afternoon, min 14°C on Fri morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 20°C on Wed afternoon, min 14°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 | S 13 | W 4 | SW 4 | WSW 4 | WNW 5 | WNW 5 | NW 4 | NW 4 | SSW 4 | SSW 5 | SSW 5 | SSW 5 | SW 5 | SW 4 | SSW 3 | SW 4 | SSW 4 | SW 4 | NE 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3 | 3 | 3 | 14 | 29 | 13 | 117 | 44 | 28 | 15 | 18 | 75 | 48 | 44 | 26 | 4 | 4 | 9 | 1 | 1 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | on | on | cross-on | cross-on | cross-on | cross | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-off | glassy | cross | cross-on |
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 | 16 | 16 | 17 | 17 | 15 | 17 | 16 | 18 | 19 | 18 | 17 | 20 | 18 | 21 | 23 | 20 |
Feels °C | 13 | 15 | 14 | 12 | 15 | 15 | 12 | 12 | 13 | 10 | 12 | 13 | 15 | 15 | 16 | 16 | 18 | 15 | 20 | 21 | 20 |
Swell 1 Height (m) Direction Period (s) | N 4 | NW 3 | — | S 12 | NW 4 | S 11 | — | SW 6 | SW 6 | NW 4 | N 4 | — | — | — | SW 5 | — | — | SW 4 | NNW 4 | SW 4 | NE 4 |
| kJ | 3 | 2 | — | 3 | 5 | 2 | — | 15 | 5 | 15 | 1 | — | — | — | 17 | — | — | 9 | 1 | 1 | 4 |
Swell 2 Height (m) Direction Period (s) | S 13 | S 13 | S 13 | — | S 12 | — | — | — | — | — | — | — | — | — | — | — | — | — | SSW 4 | SW 4 | N 4 |
| kJ | 3 | 3 | 3 | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | SW 3 | W 4 | SW 4 | WSW 4 | WNW 5 | WNW 5 | NW 4 | SSW 5 | SSW 4 | SSW 5 | SSW 5 | SSW 5 | SW 5 | SW 4 | SSW 3 | — | — | N 4 | — |
| kJ | — | — | 2 | 14 | 29 | 13 | 117 | 44 | 28 | 3 | 18 | 75 | 48 | 44 | 26 | 4 | 4 | — | — | 7 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 420 | 1525 | 261 | 1098 | 381 | 244 | 596 | 521 | 185 | 256 | 261 | 261 | 307 | 244 | 256 | 256 | 258 | 258 | 258 | 258 | 96 |
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