Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 26 Aug 2026:
- Most powerful swell: Saturday 29 Aug, 7PM (local time) - 6.5ft (2.0m), 8s period, SSW swell with 429 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 2.0m 8s and forecast to arrive on Saturday (Aug 29) 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 0.8m 4s period and expected on Friday (Aug 28) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Sat 29th Aug) | 6.5ft (2.0m) 8s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Right, folks. Rusty here. Let’s have a look at what’s cooking for Cable Bay (Porth Trecastell) over the next couple of weeks.
Gotta be straight with you – it’s a tough start. The whole first week is a write-off. We’re looking at a solid gap of about seven days with nothing worth paddling out for. The swell is tiny, the wind is messy, and most of the time the surf is just poor. Not a single wave worth chasing from Wednesday the 26th of August right through to the end of the month. There’s a bit of bump around Friday the 28th, but it’s all cross-on and weak.
Now, we finally get a little glimmer on Tuesday the 1st of September. The swell picks up to 5 ft from the SW, and the combined energy ramps up to 178 (moderate). But the wind is cross-on from the south at 12 mph, so it’s choppy and ordinary. You’d be scratching for a scrap, but it’s not the day to get excited.
The real standout, if you can call it that, is Friday the 4th of September. The morning shows a 4 ft SW swell with a clean, cross-off wind from the NNW at 6 mph. The combined energy is low at 74, but for the first time in over a week, the conditions are actually clean. The wave state is clean, and the wind is light. It’s not big, it’s not powerful, but it’s the best we’ve got. The break is fairly consistent, but it’s exposed to the SW, and that’s where the swell is coming from. Crowds are possible here (“sometimes”), so keep an eye out.
After that, it drops off again. Sunday the 6th of September morning is glassy but flat, with a tiny 0.3 ft SW swell. Not worth a look. Then Monday the 7th of September brings a massive 10 ft SW swell with a combined energy of 1254 (very strong), but it’s a near gale cross-on from the south at 31 mph. That’s blown out, dangerous, and for experts only if they’re mad. The rest of the second week is a mix of onshore wind and small, weak swell.
So, bottom line: the best on offer is the morning of Friday the 4th of September. It’s clean, small, and surfable. Everything else is either flat, blown out, or both. The water temp is about average for the time of year.
Rusty.
Short Range ForecastHeavy rain (total 39mm), heaviest during Thu afternoon. Warm (max 23°C on Wed afternoon, min 16°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 22mm), heaviest during Fri night. Very mild (max 18°C on Sat morning, min 14°C on Sat night). Winds decreasing (strong winds from the S on Sat morning, light winds from the WNW by Sun night). | ||||||||||||||||||||
Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | |||||||||||||||
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) | SW 8 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | SW 8 | SSW 7 | SW 7 | SSW 6 | SSW 6 | SSW 7 | SSW 9 | SW 9 | SW 8 | SSW 7 | WNW 5 | SW 4 | SW 6 | SW 7 | SW 7 | SSW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 17 | 12 | 5 | 6 | 4 | 16 | 77 | 96 | 114 | 218 | 222 | 362 | 110 | 64 | 36 | 35 | 34 | 164 | 158 | 67 | 29 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | cross-off | off | on | cross-on | on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross | cross-on | on | cross-on | cross-on | on | on |
High Tide | 9:25AM3.40m | 9:35PM3.81m | 9:55AM3.58m | 10:04PM4.02m | 10:23AM3.73m | 10:32PM4.18m | 10:51AM3.84m | 11:00PM4.28m | 11:19AM3.92m | 11:30PM4.30m | 11:49AM3.93m | 00:03AM4.23m | 12:23PM3.87m | 00:40AM4.07m | |||||||
Low Tide | 3:47PM0.67m | 4:13AM0.41m | 4:20PM0.46m | 4:45AM0.20m | 4:53PM0.30m | 5:18AM0.06m | 5:26PM0.21m | 5:52AM0.00m | 6:01PM0.20m | 6:27AM0.05m | 6:37PM0.27m | 7:03AM0.19m | 7:16PM0.42m | ||||||||
 |  |  |  |  |  |  | |  | | | | | | | | | |  | | | |
 | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:20 | — | — | 6:22 | — | — | 6:24 | — | — | 6:26 | — | — |
 | — | 8:22 | — | — | 8:20 | — | — | 8:16 | — | — | 8:15 | — | — | 8:13 | — | — | 8:09 | — | — | 8:07 | — |
mm | — | — | — | 1 | 17 | 19 | 2 | — | 5 | 5 | 2 | — | 4 | 3 | 2 | — | 1 | — | — | — | 2 |
Temp °C | 20 | 23 | 21 | 20 | 17 | 16 | 17 | 17 | 17 | 18 | 17 | 16 | 16 | 17 | 15 | 15 | 17 | 17 | 16 | 17 | 17 |
Feels °C | 19 | 23 | 20 | 20 | 16 | 13 | 17 | 16 | 14 | 14 | 13 | 12 | 13 | 14 | 14 | 10 | 14 | 14 | 13 | 12 | 15 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | SW 8 | SSW 7 | N 4 | — | — | — | SSW 9 | SW 9 | SW 8 | SSW 7 | SW 7 | — | — | SW 7 | SW 7 | SSW 7 |
| kJ | 17 | 12 | 5 | 5 | 4 | 16 | 77 | 10 | — | — | — | 362 | 110 | 64 | 36 | 23 | — | — | 158 | 67 | 29 |
Swell 2 Height (m) Direction Period (s) | SSE 4 | NE 5 | — | — | S 12 | S 3 | — | — | — | — | — | — | WNW 4 | WNW 4 | — | SW 10 | — | — | — | NW 4 | NNW 5 |
| kJ | 2 | 3 | — | — | 3 | 1 | — | — | — | — | — | — | 6 | 1 | — | 4 | — | — | — | 11 | 4 |
Swell 3 Height (m) Direction Period (s) | S 13 | — | S 12 | SW 12 | — | — | — | — | — | — | — | — | NNW 4 | NNW 4 | — | — | — | — | — | — | — |
| kJ | 3 | — | 3 | 6 | — | — | — | — | — | — | — | — | 4 | 2 | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | ENE 5 | — | NNE 3 | NE 5 | NE 3 | N 4 | NNW 5 | SW 7 | SSW 6 | SSW 6 | SSW 7 | N 4 | — | — | — | WNW 5 | SW 4 | SW 6 | WNW 4 | — | — |
| kJ | 9 | — | 1 | 6 | 4 | 9 | 27 | 96 | 114 | 218 | 222 | 8 | — | — | — | 35 | 34 | 164 | 20 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 246 | 313 | 285 | 258 | 258 | 109 | 212 | 44 | 282 | 325 | 106 | 106 | 49 | 283 | 173 | 397 | 338 | 44 | 261 | 261 | 286 |
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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