Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 15 Jul 2026:
- Most powerful swell: Wednesday 15 Jul, 10AM (local time) - 0.5ft (0.1m), 16s period, SW swell with 10 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 0.1m 16s and forecast to arrive on Wednesday (Jul 15) at 10AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 6s period and expected on Saturday (Jul 18) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Wed 15th Jul) | 0.5ft (0.1m) 16s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's on the cards for Cable Bay.
Right off the bat, I gotta be straight with you – this is a tough stretch. We're looking at a long, quiet spell that runs from now all the way through to the 25th of July. For over a week and a half, there's barely a ripple to get excited about. The swell is tiny, mostly around 0.3ft to 0.7ft, and while the wind is often offshore and clean, you just can't do much with nothing. It's a real bummer, and a lot of those days are a total write-off for any proper surfing.
The water is sitting at a very warm 62°, which is a solid 4° warmer than usual for this time of year – that's a notable anomaly, so you won't be needing a thick wetsuit.
Now, things start to look a little more interesting towards the end of the month. On the 26th of July, we finally see a pulse of energy, with a 2ft swell from the SW and a combined energy of just 16, which is still weak. The wind is clean offshore in the morning, but it swings cross-onshore in the afternoon with rain showers, so the window is tight.
The only real standout, and I mean the only one in this whole 16-day outlook, is the morning of the 27th of July. The swell picks up to 3ft from the SSW, with a period of only 6 seconds – that's short-period windswell, not the cleanest stuff. The combined energy hits 74, which is still weak. The downside is that the wind is a moderate cross-onshore, making it choppy. After that, it gets a bit bigger on the 28th and 29th, hitting 4ft, but the wind stays onshore and lumpy, and the period is even shorter at 4-6 seconds. For a spot like Cable Bay (Porth Trecastell), which is exposed to the SW, that onshore wind just kills the quality. Honestly, with that wind and chop, a beach setup like this might be more interesting for the kite surfers than us paddle guys.
So, to wrap it up: there's a long, painful gap with no real surf until the very end of the month. The 27th of July morning is your best shot, but it's not going to be pretty with that wind and short period. Don't hold your breath.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Wed morning, min 18°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 18°C on Fri night, min 13°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | |||||||||||||||
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 16 | SW 16 | S 16 | SW 14 | SW 14 | SSW 7 | SSW 6 | SSW 6 | SW 12 | S 11 | S 11 | S 11 | S 11 | NNW 3 | N 3 | N 5 | N 5 | NNW 6 | N 5 | NNW 4 | NNE 3 |
Wave Graph  | |||||||||||||||||||||
 kJ | 10 | 10 | 7 | 8 | 8 | 8 | 4 | 6 | 6 | 2 | 2 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | cross-off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross | cross-off | cross-off |
High Tide | 10:35AM4.00m | 10:51PM4.43m | 11:24AM3.99m | 11:39PM4.50m | 12:11PM3.90m | 00:25AM4.44m | 12:58PM3.76m | 1:12AM4.25m | 1:45PM3.57m | 2:00AM3.97m | 2:34PM3.37m | 2:51AM3.65m | 3:28PM3.18m | 3:49AM3.33m | |||||||
Low Tide | 5:04AM-0.20m | 5:21PM0.05m | 5:52AM-0.33m | 6:06PM0.03m | 6:39AM-0.31m | 6:51PM0.12m | 7:25AM-0.16m | 7:35PM0.30m | 8:10AM0.10m | 8:19PM0.55m | 8:56AM0.43m | 9:06PM0.83m | 9:44AM0.78m | 9:59PM1.11m | |||||||
 | |  |  | |  | | | | | | | | | | | | | | | | |
 | 5:07 | — | — | 5:09 | — | — | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — | 5:15 | — | — | 5:16 | — | — |
 | — | — | 9:37 | — | — | 9:37 | — | — | 9:36 | — | — | 9:34 | — | — | 9:32 | — | — | 9:31 | — | — | 9:30 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 23 | 23 | 23 | 23 | 20 | 22 | 21 | 18 | 16 | 16 | 18 | 18 | 18 | 16 | 15 | 17 | 17 | 19 | 20 | 18 |
Feels °C | 22 | 19 | 20 | 21 | 19 | 17 | 19 | 16 | 17 | 12 | 12 | 16 | 15 | 15 | 13 | 12 | 14 | 16 | 16 | 18 | 16 |
Swell 1 Height (m) Direction Period (s) | S 6 | SW 6 | SSW 6 | N 3 | SW 6 | SSW 7 | SSW 6 | SSW 6 | SW 6 | SW 6 | SW 6 | NNW 6 | NNW 4 | — | — | — | — | — | N 5 | — | — |
| kJ | 1 | 2 | 4 | 1 | 1 | 5 | 4 | 4 | 1 | 1 | 1 | 56 | 3 | — | — | — | — | — | 12 | — | — |
Swell 2 Height (m) Direction Period (s) | SW 16 | SW 16 | SW 13 | SW 6 | SW 14 | SW 12 | S 12 | SW 12 | SW 12 | S 11 | S 11 | S 11 | S 11 | — | — | — | — | — | — | — | — |
| kJ | 10 | 10 | 7 | 1 | 8 | 6 | 3 | 6 | 6 | 2 | 2 | 2 | 2 | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | S 13 | S 13 | S 16 | SW 14 | SW 7 | SW 14 | — | — | — | — | — | S 5 | — | — | — | — | — | — | — | — | — |
| kJ | 3 | 3 | 5 | 8 | 2 | 8 | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NE 4 | NE 4 | NNE 4 | — | NNE 3 | NNE 3 | N 4 | NNW 3 | N 3 | NNW 6 | N 6 | — | — | NNW 3 | N 3 | N 5 | N 5 | NNW 6 | — | NNW 4 | NNE 3 |
| kJ | 6 | 8 | 8 | — | 3 | 3 | 7 | 4 | 4 | 50 | 73 | — | — | 2 | 3 | 25 | 25 | 52 | — | 3 | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 322 | 260 | 329 | 211 | 211 | 260 | 329 | 1280 | 272 | 284 | 284 | 269 | 284 | 302 | 270 | 284 | 387 | 272 | 294 | 317 | 260 |
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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