Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 9 Aug 2026:
- Most powerful swell: Monday 10 Aug, 10AM (local time) - 1.5ft (0.4m), 6s period, SW swell with 8 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 0.4m 6s and forecast to arrive on Monday (Aug 10) at 10AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Saturday (Aug 15) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Mon 10th Aug) | 1.5ft (0.4m) 6s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright, let’s break this down in feet and miles. For Cable Bay (Porth Trecastell), it’s a grim outlook. We’re looking at a massive dry spell with nothing decent on the cards.
From Sunday the 9th of August all the way through to late on Sunday the 23rd of August, the surf is virtually non-existent. The swell is tiny, the wind is all over the place, and the combined energy is pathetic, mostly between 1 and 16 (weak). You’ll be staring at a flat ocean for nearly two weeks.
The only faint glimmer of hope comes on Monday the 24th of August. The morning brings a 4ft swell from the SW with a 6-second period, but the wind is a light offshore breeze from the NE, keeping things clean. The combined energy hits 116 (moderate), and by the afternoon it’s 131 (moderate) with the wind dropping to a slight offshore from the NE. It’s the only surfable slot in the whole forecast.
The water is sitting at 63°, which is a touch warmer than usual for the time of year.
For nearly the entire period, the conditions are so poor that this spot looks more interesting for kite surfing than paddle surfing. The Monday the 24th is just about rideable, but it’s nothing to write home about. This kind of blank run is pretty normal for the area, so don’t be too shocked. Forecasts can always change, but right now, it’s a long, flat wait.
Rusty.
Short Range ForecastMostly dry. Warm (max 22°C on Tue morning, min 13°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 25°C on Wed afternoon, min 13°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | |||||||||||||||
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 12 | SW 12 | SSW 4 | SW 6 | SW 6 | SSW 6 | SSW 6 | SW 6 | S 11 | SW 12 | SW 12 | SW 10 | SW 8 | SW 10 | SW 7 | SW 5 | SSW 5 | SW 6 | SW 7 | SW 6 | N 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 4 | 6 | 7 | 8 | 5 | 4 | 4 | 1 | 2 | 5 | 6 | 4 | 3 | 4 | 2 | 3 | 2 | 1 | 2 | 2 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-off | cross-off | cross-off | off | cross-on | on | cross | cross-on | cross-on | cross-on | glassy | cross-off | glassy | cross-on | cross | cross-off | cross-off | cross-off | off |
High Tide | 7:10PM3.38m | 7:48AM3.43m | 8:14PM3.71m | 8:49AM3.66m | 9:07PM4.05m | 9:40AM3.86m | 9:54PM4.35m | 10:25AM4.00m | 10:38PM4.54m | 11:07AM4.05m | 11:19PM4.59m | 11:46AM4.02m | 00:00AM4.50m | ||||||||
Low Tide | 1:38PM0.97m | 2:14AM0.73m | 2:42PM0.68m | 3:13AM0.33m | 3:34PM0.38m | 4:04AM-0.04m | 4:20PM0.13m | 4:50AM-0.29m | 5:04PM-0.02m | 5:34AM-0.40m | 5:45PM-0.06m | 6:15AM-0.35m | 6:25PM0.02m | ||||||||
 | |  |  | | | | |  | | | | | | |  | | | | |  | |
 | 5:47 | — | — | 5:48 | — | — | 5:50 | — | — | 5:52 | — | — | 5:52 | — | — | 5:54 | — | — | 5:56 | — | — |
 | — | 8:58 | — | — | 8:57 | — | — | 8:54 | — | — | 8:52 | — | — | 8:50 | — | — | 8:47 | — | — | 8:45 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 18 | 15 | 15 | 16 | 17 | 22 | 22 | 21 | 23 | 25 | 24 | 24 | 25 | 22 | 20 | 21 | 16 | 16 | 17 | 15 |
Feels °C | 15 | 16 | 13 | 13 | 13 | 15 | 18 | 19 | 20 | 19 | 22 | 23 | 23 | 23 | 22 | 21 | 20 | 13 | 12 | 13 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 6 | — | SSW 4 | SW 6 | SW 6 | SSW 6 | SSW 6 | SW 6 | SSW 4 | SW 12 | SSW 3 | SW 4 | SW 8 | SW 8 | SW 7 | SW 5 | SSW 5 | SW 6 | SW 7 | SW 6 | — |
| kJ | 2 | — | 7 | 8 | 5 | 4 | 4 | 1 | 1 | 5 | 2 | 1 | 3 | 3 | 2 | 3 | 2 | 1 | 2 | 2 | — |
Swell 2 Height (m) Direction Period (s) | S 12 | SW 12 | — | WNW 3 | — | — | — | NE 4 | SW 6 | SW 6 | SW 12 | SW 10 | SW 5 | SW 10 | — | — | — | — | — | — | — |
| kJ | 3 | 6 | — | 1 | — | — | — | 1 | 1 | 1 | 6 | 4 | 1 | 4 | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | S 10 | — | — | — | — | S 11 | W 10 | S 6 | SW 5 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | 2 | — | — | — | — | 2 | 2 | 1 | 1 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 3 | SW 3 | NNW 3 | N 4 | NNW 4 | — | — | — | — | SSW 3 | — | — | — | — | — | — | — | N 5 | NNW 6 | NNW 6 | N 6 |
| kJ | 4 | 2 | 1 | 4 | 3 | — | — | — | — | 3 | — | — | — | — | — | — | — | 27 | 135 | 91 | 103 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 287 | 541 | 261 | 261 | 285 | 256 | 296 | 316 | 158 | 227 | 176 | 172 | 158 | 258 | 172 | 185 | 329 | 319 | 324 | 446 | 356 |
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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