Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 31 Jul 2026:
- Most powerful swell: Wednesday 5 Aug, 7PM (local time) - 1.5ft (0.5m), 6s period, SSW swell with 22 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 0.5m 6s and forecast to arrive on Wednesday (Aug 05) at 7PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 5s period and expected on Monday (Aug 03) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Wed 5th Aug) | 1.5ft (0.5m) 6s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Gather 'round, me hearties. Rusty here. Let's have a look at what's in store for Cable Bay (Porth Trecastell).
First up, I gotta level with you: right now, and for the next couple of weeks, it's dead flat. We're looking at a proper drought. The pattern through the end of July and well into August is all poor surf conditions with next to no energy. The first bit of hope doesn't show until the back end of the forecast period.
That first small flutter of swell arrives on Sunday morning, August the 9th. It's a tiny 2 ft from the SW, but the period is a promising 7 seconds. The combined wave energy is weak at 23, but what's got my attention is the wind. It's glassy. If you're itching for a paddle, that's your window. The water temperature is about average for the time of year, so no oddities there.
Monday morning, August the 10th, is also worth a mention for a dawny. The swell drops to a tiny 0.7 ft from the SSW, but we’ve got a light easterly breeze keeping the surface clean. It's perfect for a longboard or a foiler.
That's about it. The gap from now until those dates is over a week of nada. There is one interesting blip toward the very end. On Saturday morning, August the 15th, there is no swell at all, just a moderate cross-shore from the NW at 12 mph. The setup is a beach, and with that wind and zero waves, it's looking far more like a wind sport spot than a paddler's paradise.
So, to sum it up: the only standouts in this 16-day outlook are the glassy 2 ft on Sunday the 9th and the clean, tiny morning on Monday the 10th. It's a tough run, but it tends not to stay this flat for long.
Rusty.
Short Range ForecastMostly dry. Very mild (max 19°C on Sun afternoon, min 13°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Tue night. Warm (max 22°C on Mon afternoon, min 16°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | |||||||||||||||
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) | W 4 | SW 3 | SSW 5 | SW 5 | SW 5 | SW 3 | SSW 4 | W 9 | SW 10 | SW 9 | WSW 9 | SW 8 | SW 8 | SW 7 | SW 7 | SW 7 | SSW 6 | SSW 6 | SW 6 | SW 6 | SSW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 7 | 4 | 15 | 7 | 4 | 3 | 1 | 2 | 4 | 3 | 7 | 11 | 10 | 9 | 8 | 11 | 16 | 20 | 9 | 9 | 6 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross | cross-on | on | cross-on | cross-off | cross | off | glassy | cross-off | cross-off | on | on | off | cross-off | cross-off | cross-off | cross-on | cross-off | cross-off |
High Tide | 11:19AM3.63m | 11:31PM4.09m | 11:49AM3.65m | 00:00AM4.10m | 12:20PM3.64m | 00:32AM4.05m | 12:54PM3.59m | 1:07AM3.94m | 1:32PM3.51m | 1:48AM3.77m | 2:18PM3.37m | 2:39AM3.55m | 3:15PM3.22m | 3:44AM3.33m | |||||||
Low Tide | 5:48AM0.25m | 5:54PM0.38m | 6:22AM0.21m | 6:28PM0.40m | 6:57AM0.24m | 7:04PM0.48m | 7:33AM0.34m | 7:41PM0.62m | 8:12AM0.50m | 8:22PM0.79m | 8:55AM0.70m | 9:10PM0.99m | 9:47AM0.92m | 10:11PM1.16m | |||||||
 | |  | |  |  | |  |  | | | | | |  | | | | | | | |
 | 5:31 | — | — | 5:33 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:41 | — | — |
 | — | — | 9:15 | — | — | 9:13 | — | — | 9:12 | — | — | 9:09 | — | — | 9:07 | — | — | 9:06 | — | — | 9:04 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — |
Temp °C | 14 | 17 | 17 | 13 | 15 | 15 | 18 | 19 | 17 | 20 | 22 | 17 | 17 | 18 | 17 | 18 | 18 | 16 | 17 | 17 | 15 |
Feels °C | 10 | 13 | 13 | 10 | 12 | 13 | 17 | 18 | 14 | 18 | 19 | 15 | 16 | 17 | 16 | 17 | 16 | 15 | 16 | 15 | 14 |
Swell 1 Height (m) Direction Period (s) | SW 4 | WNW 3 | SSW 5 | SW 5 | NW 3 | — | SSW 4 | — | SW 8 | NNE 4 | WSW 9 | N 5 | NE 5 | NE 4 | NE 4 | SW 7 | SSW 6 | SSW 6 | N 5 | N 5 | NE 5 |
| kJ | 3 | 1 | 15 | 6 | 3 | — | 1 | — | 3 | 2 | 7 | 14 | 8 | 5 | 4 | 11 | 16 | 20 | 12 | 7 | 6 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | W 9 | — | — | W 9 | SW 10 | SW 9 | — | SW 8 | SW 8 | SW 7 | SW 7 | NE 5 | NE 5 | SW 13 | SW 6 | SW 6 | SSW 6 |
| kJ | — | — | — | — | 2 | — | — | 2 | 4 | 3 | — | 11 | 10 | 9 | 8 | 6 | 6 | 7 | 9 | 9 | 6 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | W 9 | — | — | — | — | — | — | NE 5 | NE 5 | — | — | S 13 | W 13 | S 13 | S 12 | NNW 3 |
| kJ | — | — | — | — | — | 2 | — | — | — | — | — | — | 1 | 1 | — | — | 3 | 3 | 3 | 3 | 1 |
Wind waves Height (m) Direction Period (s) | W 4 | SW 3 | WNW 3 | NW 4 | SW 5 | SW 3 | — | — | NE 3 | — | NE 4 | ENE 5 | — | — | — | — | — | N 5 | — | — | — |
| kJ | 7 | 4 | 2 | 7 | 4 | 3 | — | — | 2 | — | 3 | 14 | — | — | — | — | — | 18 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 302 | 579 | 287 | 352 | 363 | 256 | 256 | 259 | 178 | 150 | 297 | 158 | 233 | 180 | 96 | 96 | 173 | 158 | 356 | 586 | 316 |
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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