Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 28 Jul 2026:
- Most powerful swell: Tuesday 28 Jul, 10PM (local time) - 4.5ft (1.4m), 6s period, SW swell with 128 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 1.4m 6s and forecast to arrive on Tuesday (Jul 28) at 10PM. 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 Tuesday (Aug 04) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Tue 28th Jul) | 4.5ft (1.4m) 6s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Right then, let's have a look at what's on the cards for the next couple of weeks around Cable Bay. Rusty here, and I'll be straight with you—it's a tough stretch ahead. The forecast models are showing a real quiet period, with the first day of proper surf not even appearing on the radar. We're looking at a gap of two weeks with no recommendations worth paddling out for, so don't hold your breath.
The pattern is grim. For the first few days, starting Tuesday the 28th of July, we've got a wind swell that's barely hanging on. The swell is from the SSW, around 5ft to 5ft, but it's getting hammered by a fresh cross-onshore breeze. The period is a short 6 seconds, so it's all wind chop and lumpy lines. The water is a touch warmer than normal at 62°, but that's small comfort. The combined wave energy is moderate at best, around 114 to 129 units, but it's all messy. Honestly, this is a write-off for anyone.
We slide into Wednesday and Thursday with even less. Swell drops to 3ft, still with those short periods and lumpy, choppy conditions. By Friday the 31st, the swell is 2ft to 3ft, and while the wind goes light onshore, the surf is just too weak to do anything with.
The first weekend of August is a flat spell. Sunday the 2nd shows zero swell and glassy conditions—beautiful to look at, but not a wave to be found. The Ocean is reading a book. Then Monday the 3rd brings a tiny 0.3ft swell with a long period of 8 seconds, but it's not enough to break properly.
The only glimmer of hope comes on Tuesday the 4th of August. The swell picks up to 4ft from the SW, with a period of 7 seconds and a gentle onshore breeze. The combined energy jumps to 162 units, which is moderate. But the poor surf quality tag is still there, meaning it's likely to be soft and uneven. If you're desperate, you could have a paddle, but it's not going to be a session to remember.
After that, we're back to small, choppy leftovers for the rest of the week. The 8th of August shows a brief spike of 4ft from the SSW, but it's cross-onshore and messy. The last few days of the forecast are a dribble of 0.3ft to 0.7ft surf. There's simply nothing to get excited about. The best advice I can give is to keep an eye on the weather models, because as consistent as Cable Bay can be, this is a flat spell that will test your patience.
Rusty.
Short Range ForecastMostly dry. Very mild (max 18°C on Wed morning, min 13°C on Thu night). Winds decreasing (fresh winds from the SSW on Tue afternoon, light winds from the SSW by Thu night). | Days 5-7 Weather SummaryMostly dry. Very mild (max 18°C on Sun afternoon, min 13°C on Fri night). Wind will be generally light. | |||||||||||||||||||
Tue 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | ||||||||||||||
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 5 | SW 5 | SSW 4 | SSW 4 | SW 5 | W 4 | NW 4 | SW 4 | WSW 3 | SSW 3 | SW 5 | WNW 4 | NW 3 | SW 4 | SSW 3 | N 3 | SW 10 | SW 9 | SW 8 | SW 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 125 | 72 | 22 | 21 | 17 | 15 | 8 | 3 | 3 | 7 | 21 | 5 | 3 | 3 | 1 | 0 | 4 | 3 | 11 | 10 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | on | cross | cross-on | cross-on | cross-on | on | on | cross | cross-on | on | cross-on | glassy | cross-off | off | cross-off | cross-off | off |
High Tide | 9:56PM3.72m | 10:17AM3.50m | 10:30PM3.90m | 10:49AM3.58m | 11:01PM4.02m | 11:19AM3.63m | 11:31PM4.09m | 11:49AM3.65m | 00:00AM4.10m | 12:20PM3.64m | 00:32AM4.05m | 12:54PM3.59m | 1:07AM3.94m | |||||||
Low Tide | 4:13PM0.71m | 4:39AM0.51m | 4:47PM0.55m | 5:13AM0.35m | 5:20PM0.43m | 5:48AM0.25m | 5:54PM0.38m | 6:22AM0.21m | 6:28PM0.40m | 6:57AM0.24m | 7:04PM0.48m | 7:33AM0.34m | 7:41PM0.62m | |||||||
 |  | | |  |  | | | | | | | | |  | |  | | | | |
 | — | — | 5:28 | — | — | 5:30 | — | — | 5:31 | — | — | 5:33 | — | — | 5:35 | — | — | 5:37 | — | — |
 | — | 9:20 | — | — | 9:17 | — | — | 9:16 | — | — | 9:15 | — | — | 9:13 | — | — | 9:12 | — | — | 9:09 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 17 | 18 | 18 | 16 | 14 | 16 | 16 | 15 | 16 | 16 | 13 | 15 | 15 | 17 | 18 | 16 | 15 | 16 | 14 |
Feels °C | 12 | 14 | 14 | 14 | 15 | 10 | 14 | 14 | 11 | 11 | 15 | 9 | 13 | 12 | 14 | 15 | 14 | 13 | 13 | 13 |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | SW 5 | — | NW 4 | SW 4 | N 4 | WNW 3 | SW 5 | SW 4 | NW 3 | SW 4 | SSW 3 | — | SW 10 | SW 9 | SW 8 | SW 8 |
| kJ | — | — | — | — | 17 | — | 8 | 3 | 1 | 1 | 21 | 2 | 3 | 3 | 1 | — | 4 | 3 | 11 | 10 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | SW 4 | — | NNW 3 | — | — | — | WSW 5 | — | — | — | N 3 | — | N 3 | NNW 3 |
| kJ | — | — | — | — | — | — | 5 | — | 1 | — | — | — | 2 | — | — | — | 1 | — | 1 | 1 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 5 | SW 5 | SSW 4 | SSW 4 | WNW 2 | W 4 | — | — | WSW 3 | SSW 3 | — | WNW 4 | SSW 5 | — | — | N 3 | — | — | — | — |
| kJ | 125 | 72 | 22 | 21 | 1 | 15 | — | — | 3 | 7 | — | 5 | 2 | — | — | 2 | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 261 | 256 | 258 | 256 | 256 | 541 | 580 | 294 | 302 | 286 | 333 | 351 | 363 | 256 | 256 | 295 | 173 | 185 | 317 | 172 |
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