Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 5 Jul 2026:
- Most powerful swell: Sunday 5 Jul, 4PM (local time) - 2.5ft (0.7m), 4s period, SW swell with 16 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 0.7m 4s and forecast to arrive on Sunday (Jul 05) at 4PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 6s period and expected on Saturday (Jul 11) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Sun 5th Jul) | 2.5ft (0.7m) 4s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
Updates in hr min s Forecast update imminent
Alright folks, Rusty here. Let's take a look at what's happening with the surf over the next couple of weeks. I've got the charts up for the region, and well, it's a bit of a quiet story I'm afraid.
We're looking at a long, flat spell for the most part. The first hint of anything rideable is a tiny, weak 2ft SW swell on Sunday the 5th, but with an onshore breeze and only weak wave energy (27), it's going to be pretty poor. The water temperature is sitting at 61°, which is a touch warmer than normal for this time of year. For the next several days, it’s the same story: tiny swells, onshore or cross-off winds, and the "poor surf conditions" tag keeps popping up. We see a few days with absolutely no swell height and zero energy, particularly from Wednesday the 8th through to the end of the period on Monday the 20th.
Now, if you look closely, there are a few moments where the wind turns offshore. On Thursday afternoon the 9th, we get a NE 9 mph wind and a clean looking surface with a tiny 0.7ft WNW swell, but the energy is only 1, which is basically nothing. That kind of setup is more interesting for a kite surfer than a paddle surfer really.
Later on, from Monday the 13th through Thursday the 16th, we have consistent offshore winds from the NE, with long-period groundswell showing up from the SW (periods of 14 to 18 seconds). But the wave heights are only 0.3ft to 0.3ft. That’s the kind of long-period groundswell that, if there was any size, would be better at points and reefs, but at a spot like Cable Bay (Porth Trecastell) which is exposed to the SW, it’s just not going to break with that tiny height. The overall combined energy for these days is also very weak, ranging from 7 to 12.
Honestly, the whole 16-day window looks like a write-off for surf. There are no standouts to get excited about. It's a flat run for the area, which happens.
Rusty
Short Range ForecastMostly dry. Very mild (max 19°C on Tue afternoon, min 15°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 5mm), mostly falling on Fri night. Warm (max 23°C on Thu morning, min 13°C on Fri night). Winds increasing (calm on Wed night, fresh winds from the NNW by Fri night). | ||||||||||||||||||||
Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | |||||||||||||||
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 6 | SW 4 | SW 4 | WSW 4 | SW 5 | SW 4 | NW 4 | NW 4 | S 12 | — | — | — | S 11 | WNW 3 | NE 3 | NNW 4 | N 4 | NNW 6 | NW 7 | NNW 5 | N 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 21 | 16 | 14 | 5 | 6 | 9 | 8 | 2 | 3 | 0 | 0 | 0 | 3 | 1 | 0 | 0 | 0 | 0 | 7 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | on | on | cross-on | on | on | cross-on | on | on | cross-off | cross-off | off | off | cross-off | cross-off | cross-off | cross-off | cross | cross-off |
High Tide | 1:25PM3.28m | 1:39AM3.69m | 2:08PM3.22m | 2:23AM3.59m | 2:59PM3.16m | 3:15AM3.47m | 4:00PM3.13m | 4:19AM3.39m | 5:08PM3.17m | 5:31AM3.38m | 6:16PM3.29m | 6:42AM3.46m | 7:20PM3.49m | ||||||||
Low Tide | 8:10PM0.86m | 8:45AM0.69m | 8:52PM1.00m | 9:30AM0.79m | 9:42PM1.13m | 10:22AM0.89m | 10:42PM1.21m | 11:26AM0.95m | 11:55PM1.20m | 12:38PM0.92m | 1:12AM1.03m | 1:49PM0.78m | 2:21AM0.73m | ||||||||
 | |  | | | |  | |  | | | | | | | |  |  | |  |  | |
 | 4:58 | — | — | 4:58 | — | — | 4:58 | — | — | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:03 | — | — |
 | — | — | 9:45 | — | — | 9:45 | — | — | 9:45 | — | — | 9:44 | — | — | 9:43 | — | — | 9:43 | — | — | 9:42 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 4 | 5 | 8 | 7 |
Temp °C | 17 | 18 | 17 | 17 | 18 | 17 | 18 | 19 | 19 | 20 | 21 | 20 | 23 | 23 | 19 | 21 | 20 | 15 | 13 | 12 | 12 |
Feels °C | 15 | 17 | 15 | 15 | 15 | 16 | 15 | 16 | 17 | 21 | 21 | 21 | 22 | 21 | 17 | 21 | 17 | 10 | 8 | 6 | 5 |
Swell 1 Height (m) Direction Period (s) | NW 4 | — | — | NW 4 | WNW 3 | SW 4 | NW 4 | NW 4 | S 12 | — | — | — | S 11 | WNW 3 | — | NNW 4 | — | NNW 6 | NW 7 | — | — |
| kJ | 4 | — | — | 2 | 1 | 9 | 8 | 2 | 3 | — | — | — | 3 | 1 | — | 6 | — | 97 | 7 | — | — |
Swell 2 Height (m) Direction Period (s) | NW 4 | — | — | — | — | — | SW 4 | — | S 12 | — | — | — | — | — | — | — | — | — | W 4 | — | — |
| kJ | 2 | — | — | — | — | — | 4 | — | 3 | — | — | — | — | — | — | — | — | — | 1 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 6 | SW 4 | SW 4 | WSW 4 | SW 5 | WNW 3 | — | SSW 4 | SW 3 | — | — | — | — | — | NE 3 | — | N 4 | — | N 5 | NNW 5 | N 6 |
| kJ | 21 | 16 | 14 | 5 | 6 | 1 | — | 2 | 3 | — | — | — | — | — | 2 | — | 14 | — | 92 | 102 | 247 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 185 | 299 | 294 | 261 | 244 | 261 | 261 | 352 | 256 | 246 | 256 | 246 | 246 | 352 | 242 | 172 | 541 | 574 | 574 | 574 | 325 |
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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