Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 17 Jul 2026:
- Most powerful swell: Friday 24 Jul, 7AM (local time) - 2.5ft (0.8m), 4s period, WNW swell with 20 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 Friday (Jul 24) at 7AM. Winds are predicted to be cross-onshore 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 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7AM (Fri 24th Jul) | 2.5ft (0.8m) 4s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright, Rusty here. Let's get into it, my fellow wave hunters. The forecast for Cable Bay (Porth Trecastell) is a bit of a drought, so let's be honest about what we're looking at.
Honestly, looking at the next 16 days, it’s slim pickings. We’ve got a real flat spell coming up. From now, right through the end of July and into the very start of August, there’s just nothing doing. The energy is almost non-existent, with the combined swell energy barely registering. We’re talking a solid 10 days or more of flat, clean but flat water. It’s one of those stretches where you’re better off swimming or just enjoying the beach.
The first real sign of life, and I mean a tiny whisper, shows up on the morning of Thursday the 23rd of July. A tiny 1ft swell from the west with a short, weak period of 3 seconds. The combined energy is a mere 2 (weak energy). It’s a cross-shore breeze, so it’ll be clean, but it’s not even worth waxing the board for. The swell is just too small and weak to push any decent shape.
We get a bit more movement on Friday the 24th of July. The morning brings a 2.6ft swell from the WNW, with a period of 5 seconds. The combined energy jumps to 33 (weak energy), but it’s not enough to get excited about. The problem is the wind is a moderate cross-onshore, so the surface will be a bit choppy and messy. That afternoon, the wind swings onshore from the SW, making it worse.
The best we can hope for in this whole outlook is the morning of Saturday the 25th of July. We’ll see a 2.6ft swell from the NW, period of 5 seconds, and combined energy of 39 (weak energy). The wind is a moderate cross-shore from the NW, which is about as good as it gets for this period. It won’t be glassy, but it’ll be ridable for the beginners on a longboard. It’s definitely not a standout, but it’s the most surfable wave on offer.
After that, it’s back to the doldrums. The rest of the month and into August shows nothing but flat, clean conditions. The water temperature is about average for this time of year, nothing unusual to report here.
So, for the die-hards, Saturday the 25th of July morning is your only real window, and even then, keep your expectations low. The rest of the 16-day window is a write-off for surf. It’s a good time to clean the wax off your deck.
Short Range ForecastMostly dry. Warm (max 20°C on Thu night, min 12°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 17°C on Tue afternoon, min 12°C on Tue night). Winds increasing (light winds from the N on Tue night, fresh winds from the NNW by Wed morning). | ||||||||||||||||||||
Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | |||||||||||||||
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 6 | SSW 6 | SW 12 | S 13 | S 11 | S 11 | S 11 | S 10 | S 10 | N 5 | NNW 5 | N 4 | NNW 5 | NNW 5 | N 6 | NNW 6 | NNW 6 | N 6 | NNW 5 | W 3 | WNW 3 |
Wave Graph  | |||||||||||||||||||||
 kJ | 4 | 6 | 6 | 5 | 2 | 2 | 2 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 4 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | on |
High Tide | 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 | 4:30PM3.04m | 4:56AM3.09m | 5:37PM2.97m | ||||||||
Low Tide | 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 | 10:38AM1.10m | 11:03PM1.32m | 11:45AM1.31m | 00:23AM1.40m | |||||||
 | |  |  | | | | | | | | | | |  | | | | | | | |
 | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — | 5:15 | — | — | 5:16 | — | — | 5:18 | — | — | 5:18 | — | — |
 | — | — | 9:36 | — | — | 9:34 | — | — | 9:32 | — | — | 9:31 | — | — | 9:30 | — | — | 9:29 | — | — | 9:28 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 20 | 20 | 18 | 14 | 17 | 17 | 17 | 18 | 16 | 14 | 15 | 16 | 14 | 17 | 15 | 14 | 17 | 15 | 15 | 18 | 17 |
Feels °C | 15 | 16 | 15 | 9 | 13 | 14 | 13 | 15 | 14 | 11 | 12 | 14 | 11 | 14 | 14 | 9 | 12 | 11 | 12 | 16 | 15 |
Swell 1 Height (m) Direction Period (s) | SSW 6 | SSW 6 | SW 6 | SW 6 | SW 6 | N 5 | S 11 | S 10 | S 10 | — | — | — | — | NNW 5 | — | — | — | — | — | N 5 | WSW 3 |
| kJ | 4 | 4 | 1 | 1 | 1 | 18 | 2 | 2 | 2 | — | — | — | — | 13 | — | — | — | — | — | 7 | 1 |
Swell 2 Height (m) Direction Period (s) | S 12 | SW 12 | SW 12 | SW 11 | S 11 | S 11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 3 | 6 | 6 | 5 | 2 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | S 13 | — | S 5 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | 3 | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 4 | N 4 | N 4 | NNW 6 | NNW 6 | — | NNW 4 | NNW 4 | N 4 | N 5 | NNW 5 | N 4 | NNW 5 | N 5 | N 6 | NNW 6 | NNW 6 | N 6 | NNW 5 | W 3 | WNW 3 |
| kJ | 4 | 6 | 11 | 92 | 112 | — | 5 | 4 | 6 | 23 | 17 | 17 | 25 | 11 | 86 | 126 | 52 | 64 | 30 | 2 | 4 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 329 | 596 | 319 | 284 | 284 | 270 | 284 | 302 | 272 | 284 | 325 | 272 | 300 | 995 | 53 | 886 | 925 | 53 | 272 | 282 | 295 |
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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