Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 29 Jul 2026:
- Most powerful swell: Wednesday 29 Jul, 7PM (local time) - 4ft (1.2m), 5s period, SSW swell with 61 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 1.2m 5s and forecast to arrive on Wednesday (Jul 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 0.6m 4s period and expected on Monday (Aug 03) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Wed 29th Jul) | 4ft (1.2m) 5s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s take a look at what’s on the cards for Cable Bay.
Right off the bat, I’ve got to be straight with you – this is a tough one. The next 16 days are looking like a proper write-off for any decent waves. We’re staring down the barrel of a long, dry spell with no real surf to speak of. The whole period is a gap, basically. From the 29th of July all the way through to the 13th of August, there’s nothing that’s going to get you excited.
The main issue is a total lack of swell energy. The combined energy of all swells directed here barely ever gets past a measly 28 (22-28), and most of the time it’s down in the single digits. That’s weak, flat-bank stuff. The swell heights are tiny, mostly between 0.3 ft and 3 ft, and the periods are short, choppy junk, mostly 3 to 5 seconds. There’s no grunt behind it.
The wind is a mixed bag of cross-on and onshore for the first week, which would just mess up what little bump there is. By the 2nd of August, we get some clean offshore breezes from the NE, but with the swell dropping to 0.3 ft, it’s just a flat, glassy lake. Even later on, when we get some longer-period swell (11-13 seconds) around the 7th of August, the heights are still a pathetic 0.3 ft, so it’s completely unrideable. The water is about average for this time of year, but that’s small comfort.
Honestly, there’s no standout, no best day, no recommendation to make. It’s a blank run that’s pretty normal for the area when the patterns lock in like this. Keep the board in the car, check the forecast, and hope things change. It tends not to stay this poor for too long.
Rusty.
Short Range ForecastMostly dry. Very mild (max 19°C on Wed afternoon, min 13°C on Thu night). Winds decreasing (fresh winds from the SSW on Wed afternoon, calm by Thu night). | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Mon night. Very mild (max 18°C on Sun afternoon, min 13°C on Sat morning). Winds increasing (calm on Sun morning, fresh winds from the NE by Mon afternoon). | ||||||||||||||||||||
Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | |||||||||||||||
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 4 | SSW 4 | SW 5 | WNW 4 | NW 4 | SW 4 | W 4 | SW 3 | SW 5 | W 4 | NW 3 | SW 4 | SSW 4 | W 8 | SW 10 | WSW 9 | SW 9 | SW 8 | SW 8 | SW 7 | SSW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 22 | 24 | 27 | 9 | 3 | 3 | 7 | 4 | 17 | 9 | 3 | 5 | 3 | 1 | 4 | 8 | 3 | 11 | 9 | 9 | 5 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross-on | on | glassy | cross-on | on | cross | cross-on | cross-on | cross-on | glassy | cross-off | off | cross-off | off | cross-off | cross-off | off | off |
High Tide | 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 | 1:32PM3.51m | 1:48AM3.77m | |||||||
Low Tide | 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 | 8:12AM0.50m | 8:22PM0.79m | ||||||||
 | |  |  | |  | | | | | |  | |  |  | |  | | |  |  | |
 | 5:28 | — | — | 5:30 | — | — | 5:31 | — | — | 5:33 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — |
 | — | — | 9:17 | — | — | 9:16 | — | — | 9:15 | — | — | 9:13 | — | — | 9:12 | — | — | 9:09 | — | — | 9:07 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | 1 | 5 | 5 | 9 | 6 |
Temp °C | 18 | 19 | 17 | 15 | 16 | 17 | 14 | 15 | 17 | 14 | 15 | 15 | 17 | 18 | 14 | 14 | 14 | 16 | 13 | 13 | 13 |
Feels °C | 14 | 15 | 17 | 12 | 14 | 15 | 11 | 11 | 14 | 11 | 13 | 12 | 15 | 15 | 12 | 11 | 10 | 10 | 9 | 10 | 9 |
Swell 1 Height (m) Direction Period (s) | — | — | SW 5 | SW 5 | NW 4 | SW 4 | NW 4 | WNW 3 | SW 5 | SW 4 | NW 3 | — | SSW 4 | SW 4 | SW 8 | SW 9 | SW 9 | SW 8 | NNW 4 | SW 7 | SSW 7 |
| kJ | — | — | 27 | 6 | 3 | 3 | 5 | 1 | 17 | 3 | 3 | — | 2 | 1 | 3 | 3 | 3 | 11 | 3 | 9 | 5 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | SW 5 | — | SW 4 | — | — | — | — | SW 9 | — | W 8 | SW 10 | WSW 9 | — | NNW 4 | SW 8 | — | NNW 3 |
| kJ | — | — | — | — | 3 | — | 3 | — | — | — | — | 3 | — | 1 | 4 | 8 | — | 1 | 9 | — | 1 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | SW 8 | — | — | — | — | — | NE 4 | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 3 | — | — | — | — | — | 1 | — | — |
Wind waves Height (m) Direction Period (s) | SSW 4 | SSW 4 | WNW 3 | WNW 4 | — | — | W 4 | SW 3 | WNW 3 | W 4 | SW 3 | SW 4 | NNW 3 | N 3 | NNE 4 | N 4 | N 4 | N 4 | — | NNE 3 | — |
| kJ | 22 | 24 | 2 | 9 | — | — | 7 | 4 | 1 | 9 | 2 | 5 | 2 | 3 | 10 | 7 | 6 | 6 | — | 1 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 256 | 256 | 256 | 256 | 541 | 579 | 259 | 298 | 580 | 317 | 352 | 363 | 261 | 261 | 308 | 157 | 158 | 158 | 296 | 452 | 587 |
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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