Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 23 Aug 2026:
- Most powerful swell: Saturday 29 Aug, 10PM (local time) - 7.5ft (2.3m), 7s period, SW swell with 458 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 2.3m 7s and forecast to arrive on Saturday (Aug 29) 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 0.7m 4s period and expected on Tuesday (Aug 25) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Sat 29th Aug) | 7.5ft (2.3m) 7s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright folks, let's talk about Cable Bay (Porth Trecastell). I've got to be straight with you, it's looking like a proper bust for the foreseeable. The data is all showing poor surf conditions, so don't get your hopes up. We're looking at a huge gap with nothing worth paddling out for, from right now on the 23rd of August all the way through to the 7th of September. That's a long, dry spell.
The first couple of days, the 23rd and 24th, there's just a tiny 0.3 ft swell from the SW. It's not enough to even ripple the surface, even if it is glassy on Monday morning. Water temp is about what you'd expect for this time of year.
Things try to pick up from the 27th, but it's all a bit of a mess. On Thursday the 27th, the swell gets to 3 ft from the SSW, but it's a short period wind swell of 7-8 seconds and the wind is cross-onshore, making it choppy. The energy is moderate at 110, but the quality is just not there. It stays messy through the end of August; the swell builds but the wind stays onshore or cross-onshore. On the 29th, the swell hits 7 ft from the SW, but with a period of just 6 seconds and a cross-onshore breeze, it's going to be a lumpy, bumpy mess. With that size and wind, it looks more like a kite-surfing session than a paddle one.
September starts the same way. The 3rd of September has another pulse of swell at 7 ft from the SW, but again it's onshore wind and short period, making it choppy and blown out. The energy is moderate to strong at 384, but without clean conditions, it's a write-off. The only thing of note is the morning of the 7th of September, where we get a strong offshore wind from the NE at 25 mph. But the swell is a pathetic 1 ft, so you'd be hunting for a ripple. That offshore will clean it up, but there's simply no wave to ride.
So there you have it: no standout days at all. It's a two-week blank. Cable Bay is fairly consistent, so this is a bad patch, but it won't stay poor forever. Keep watching the forecasts, as they can change.
Rusty.
Short Range ForecastMostly dry. Warm (max 22°C on Tue afternoon, min 12°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 19mm), heaviest on Thu morning. Warm (max 21°C on Wed afternoon, min 14°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | |||||||||||||||
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 14 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 13 | SSW 9 | SW 8 | SW 8 | SSW 7 | SSW 7 | SSW 8 | SSW 6 | SSW 8 | SSW 8 | SSW 8 | WSW 6 | SW 6 | SW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 8 | 7 | 7 | 8 | 7 | 7 | 7 | 7 | 7 | 17 | 16 | 11 | 17 | 110 | 110 | 128 | 120 | 114 | 195 | 315 | 458 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross | glassy | cross | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on |
High Tide | 7:04AM2.82m | 7:32PM3.02m | 8:05AM2.99m | 8:24PM3.28m | 8:49AM3.20m | 9:03PM3.55m | 9:25AM3.40m | 9:35PM3.81m | 9:55AM3.58m | 10:04PM4.02m | 10:23AM3.73m | 10:32PM4.18m | 10:51AM3.84m | 11:00PM4.28m | |||||||
Low Tide | 1:41PM1.46m | 2:17AM1.25m | 2:33PM1.20m | 3:02AM0.96m | 3:12PM0.93m | 3:39AM0.68m | 3:47PM0.67m | 4:13AM0.41m | 4:20PM0.46m | 4:45AM0.20m | 4:53PM0.30m | 5:18AM0.06m | 5:26PM0.21m | ||||||||
 | |  | |  |  | |  |  | | |  |  |  | | | |  | |  | | |
 | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:20 | — | — |
 | — | 8:29 | — | — | 8:27 | — | — | 8:23 | — | — | 8:22 | — | — | 8:20 | — | — | 8:16 | — | — | 8:15 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 5 | 13 | 1 | — | — | — | 3 | 1 | 1 | — |
Temp °C | 15 | 16 | 17 | 19 | 20 | 20 | 21 | 22 | 18 | 20 | 21 | 18 | 19 | 20 | 16 | 17 | 17 | 16 | 16 | 17 | 16 |
Feels °C | 13 | 13 | 15 | 17 | 18 | 16 | 18 | 19 | 14 | 19 | 21 | 17 | 17 | 17 | 14 | 15 | 15 | 14 | 12 | 13 | 11 |
Swell 1 Height (m) Direction Period (s) | N 4 | SW 14 | SW 13 | SW 10 | — | SW 13 | SW 13 | SW 13 | SSW 9 | SW 8 | SW 8 | SSW 4 | SSW 7 | — | SW 8 | SSW 8 | SSW 8 | SSW 8 | — | NW 5 | — |
| kJ | 6 | 7 | 7 | 4 | — | 7 | 7 | 7 | 7 | 17 | 16 | 3 | 17 | — | 24 | 128 | 120 | 114 | — | 5 | — |
Swell 2 Height (m) Direction Period (s) | SW 14 | — | SW 14 | SW 14 | SW 9 | SW 9 | SW 8 | SW 8 | S 13 | — | NNE 4 | SSW 7 | S 12 | — | — | SSW 5 | — | — | — | — | — |
| kJ | 8 | — | 7 | 8 | 3 | 3 | 3 | 3 | 3 | — | 2 | 11 | 3 | — | — | 14 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | SW 14 | — | SW 13 | — | SW 8 | — | — | S 13 | S 4 | NNE 4 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 7 | — | 7 | — | 3 | — | — | 3 | 1 | 1 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | N 4 | — | — | — | E 3 | ENE 5 | NE 5 | ENE 5 | NE 5 | — | — | — | SSW 8 | SSW 6 | — | — | WNW 4 | WSW 6 | SW 6 | SW 7 |
| kJ | — | 1 | — | — | — | 5 | 15 | 14 | 19 | 8 | — | — | — | 110 | 110 | — | — | 30 | 195 | 315 | 458 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 158 | 211 | 158 | 256 | 259 | 258 | 286 | 258 | 296 | 297 | 272 | 285 | 258 | 277 | 106 | 106 | 44 | 167 | 282 | 284 | 506 |
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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