Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 5 Jul 2026:
- Most powerful swell: Sunday 5 Jul, 4PM (local time) - 2.5ft (0.8m), 4s period, SW swell with 21 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 0.8m 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 1.1m 5s period and expected on Saturday (Jul 11) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Sun 5th Jul) | 2.5ft (0.8m) 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 have a look at what Cable Bay (Porth Trecastell) has got cookin’ for us. Gotta be straight with you – this one’s a tough stretch.
We’re staring at a long, flat spell to kick things off. There’s nothing worth paddling out for from now through to Sunday the 20th of July. That’s a brutal two-week gap with no surf to speak of. The odd little bump shows up, but with swell heights scraping in at 0.7 ft and periods barely hitting 4 seconds, it’s just wind chop with no power. The combined wave energy is pitiful, barely reaching double digits (max 21), which is weak as dishwater.
There’s a faint glimmer right at the very end. On the morning of Tuesday the 14th of July, we see a tiny pulse of 0.3 ft from the SW, but it’s riding on an 18-second period – very long period groundswell. That gives it a little bit of life, with the energy hitting 12. Wind is light from the NW, so it’s cross-shore with just small ripples. The water temp is about average for the time of year, nothing unusual there. Honestly though, with a break like Cable Bay, which is an exposed SW-facing spot, this is just a whisper of a wave. It’s inconsistent… rarely breaks in any meaningful way.
The crowd profile says it gets busy sometimes, but with this kind of flatness, you’ll have the place to yourself. It’s not a standout – in fact, it’s the only flash of anything all fortnight. For a spot that’s fairly consistent in general, this is an unusually blank run. Forecasts can change, but right now, I’d hang the board up for a couple weeks. On the 19th and 20th of July, there’s a bit of onshore wind and some rain, but still no swell to speak of.
Rusty, signing out.
Short Range ForecastMostly dry. Very mild (max 19°C on Tue afternoon, min 15°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 24°C on Fri morning, min 18°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
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) | WSW 4 | SW 4 | SW 4 | NW 4 | SW 3 | SSW 4 | NW 4 | WNW 4 | S 12 | SSW 3 | — | — | S 11 | WNW 3 | — | S 10 | NNW 3 | N 5 | N 5 | NNW 5 | NNW 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 13 | 21 | 17 | 4 | 4 | 13 | 8 | 2 | 3 | 1 | 0 | 0 | 3 | 1 | 0 | 2 | 0 | 0 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | on | cross-on | on | cross-on | cross-on | on | on | glassy | cross-off | cross-off | off | off | cross-off | cross-off | cross-off | cross-off | 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 | 8:04AM0.60m | 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 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 18 | 18 | 17 | 18 | 17 | 18 | 19 | 19 | 20 | 21 | 21 | 23 | 23 | 20 | 24 | 24 | 19 | 19 | 21 | 20 |
Feels °C | 14 | 16 | 16 | 15 | 16 | 16 | 15 | 16 | 17 | 19 | 20 | 20 | 21 | 21 | 18 | 23 | 22 | 17 | 15 | 18 | 18 |
Swell 1 Height (m) Direction Period (s) | NW 4 | — | — | NW 4 | WNW 3 | SSW 4 | NW 4 | WNW 4 | S 12 | — | — | — | — | WNW 3 | — | S 10 | — | — | — | — | NNW 4 |
| kJ | 2 | — | — | 4 | 1 | 13 | 8 | 1 | 3 | — | — | — | — | 1 | — | 2 | — | — | — | — | 3 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | SW 4 | — | — | — | — | — | S 11 | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | 4 | — | — | — | — | — | 3 | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WSW 4 | SW 4 | SW 4 | SW 4 | SW 3 | WNW 3 | — | SSW 4 | SSW 3 | SSW 3 | — | — | — | — | — | — | NNW 3 | N 5 | N 5 | NNW 5 | — |
| kJ | 13 | 21 | 17 | 4 | 4 | 1 | — | 2 | 2 | 1 | — | — | — | — | — | — | 4 | 27 | 55 | 24 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 187 | 299 | 294 | 302 | 261 | 261 | 261 | 350 | 246 | 246 | 246 | 259 | 246 | 318 | 233 | 178 | 172 | 181 | 180 | 322 | 258 |
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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