Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 28 Jul 2026:
- Most powerful swell: Tuesday 28 Jul, 7PM (local time) - 4.5ft (1.4m), 6s period, SW swell with 110 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 7PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Tuesday (Aug 04) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (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
Hey, it’s Rusty. Let’s talk about the surf for the next couple of weeks. I’m not gonna sugarcoat it, it’s looking pretty flat. There’s a big gap at the start with no real surf to speak of.
The only break we’ve got on the list is Cable Bay (Porth Trecastell). From Tuesday the 28th of July, it’s poor. The waves are tiny, and the wind is all over the place, mostly cross-onshore or onshore, making it choppy and lumpy. The combined energy is weak, barely getting into double digits, like 67 on the Tuesday morning. That’s a no-go.
As we get into the second week, things change. Around Sunday the 2nd of August, the wind goes light offshore or cross-off, and the water gets clean. But the swell is basically nothing at 0.7 feet. The combined energy is a measly 3. It’s clean, but it’s a pond. That clean, flat pattern hangs around for a few days, with some offshore winds on Monday the 3rd and Tuesday the 4th, but the ocean just doesn’t have any power.
The best chance, and I mean the best of a bad situation, looks like from the 6th of August onward. The wind stays light cross-off or offshore, which is a big positive. The swell has a little more life with a period of 12 to 13 seconds, which is a long-period groundswell. For a point break like Cable Bay, that’s the right kind of swell, but the height is still only 0.3 feet. The combined energy is still low, like 7 on the 7th of August.
Even on the 12th of August, the last day in the forecast, the swell is only 2 feet with an 8-second period. The wind is offshore and clean, but the energy is still weak at 37. It’s just not enough.
So, there’s no standout wave. The cleanest window is from the 6th of August onward, but it’s tiny. For this area, a flat run like this is pretty normal. The forecasts can change, but for now, it’s a waiting game.
Rusty.
Short Range ForecastSome drizzle, heaviest during Wed afternoon. Very mild (max 18°C on Mon night, min 14°C on Wed night). Winds decreasing (fresh winds from the SSW on Tue afternoon, calm by Thu afternoon). | Days 4-6 Weather SummaryMostly dry. Very mild (max 18°C on Sun afternoon, min 13°C on Thu night). Winds decreasing (fresh winds from the SW on Fri afternoon, calm by Sat night). | ||||||||||||||||||||
Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | |||||||||||||||
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) | SSW 5 | SSW 5 | SW 5 | SSW 4 | SSW 4 | SSW 5 | WNW 4 | SW 5 | SW 4 | W 4 | SW 4 | SW 5 | W 4 | NW 4 | SW 4 | SSW 4 | NW 4 | — | SW 8 | SW 8 | SW 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 67 | 87 | 60 | 29 | 21 | 14 | 16 | 9 | 3 | 10 | 23 | 25 | 16 | 8 | 4 | 2 | 2 | 0 | 3 | 3 | 3 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross | on | on | on | cross-on | cross-on | on | cross-on | off | cross-off | off | off | off | cross-off |
High Tide | 9:41AM3.38m | 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 | 4:03AM0.71m | 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 | |||||||
 | |  |  |  | |  | |  | | | | | | | | | | | |  | |
 | 5:26 | — | — | 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 | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 18 | 18 | 17 | 18 | 18 | 15 | 15 | 16 | 16 | 14 | 16 | 17 | 14 | 16 | 15 | 17 | 18 | 15 | 21 | 20 | 21 |
Feels °C | 14 | 14 | 14 | 14 | 15 | 15 | 11 | 12 | 14 | 10 | 12 | 13 | 10 | 12 | 12 | 14 | 15 | 11 | 19 | 15 | 18 |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | — | SSW 5 | SW 5 | NW 4 | SW 5 | — | WNW 4 | SW 5 | SW 5 | NW 4 | SW 4 | NNW 4 | NNW 4 | — | SW 8 | SW 8 | SW 8 |
| kJ | — | — | — | — | — | 14 | 6 | 7 | 1 | — | 1 | 25 | 8 | 8 | 4 | 6 | 3 | — | 3 | 3 | 3 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | SW 5 | N 4 | — | — | — | — | SW 5 | — | SSW 4 | — | — | SW 8 | — | — |
| kJ | — | — | — | — | — | — | — | 9 | 2 | — | — | — | — | 3 | — | 2 | — | — | 3 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 8 | — | SW 4 | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | 1 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 5 | SSW 5 | SW 5 | SSW 4 | SSW 4 | — | WNW 4 | SW 5 | SW 4 | W 4 | SW 4 | WNW 3 | W 4 | — | NNW 2 | WNW 3 | NW 4 | — | — | NNE 3 | NNE 3 |
| kJ | 67 | 87 | 60 | 29 | 21 | — | 16 | 5 | 3 | 10 | 23 | 2 | 16 | — | 1 | 1 | 2 | — | — | 3 | 6 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 261 | 261 | 256 | 333 | 302 | 256 | 590 | 580 | 261 | 351 | 582 | 302 | 596 | 412 | 256 | 286 | 302 | 256 | 295 | 295 | 233 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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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