Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 19 Jul 2026:
- Most powerful swell: Saturday 25 Jul, 4PM (local time) - 1.5ft (0.5m), 4s period, NW swell with 7 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 0.5m 4s and forecast to arrive on Saturday (Jul 25) at 4PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Wednesday (Jul 22) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Sat 25th Jul) | 1.5ft (0.5m) 4s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Right, folks, Rusty here. Let's have a look at what's on the table for our little patch of coast.
It's a grim picture, I'm gutted to tell you. We're looking at a solid 16-day window with absolutely nothing worth paddling out for. The first few days are a total write-off, with barely a ripple and nothing but cross-off breezes. We’ve got a dry spell from the 19th all the way through to the 23rd of July with zero swell energy – just a flat, clean lake.
Come Thursday the 23rd, a tiny little 1ft dribble from the WNW shows up with a period of 3 seconds, but it’s crossed-up and offers nothing. The whole situation is poor. The only real bump in the road comes right at the end of the month, on the 30th of July. We see a 4ft swell from the WSW, with a period of 5 seconds. The combined energy is a weak 50 (moderate), but the wind is a cross-onshore, making it choppy and messy. It’s still poor surf. The water is about average for this time of year.
Even the more exposed spots like Cable Bay (Porth Trecastell) – which is an exposed SW spot – can't get a sniff. The swell direction is all wrong, and when we do get a little pulse, the wind is on it or cross-off, ruining any chance of shape. This isn't a spot for the faint-hearted anyway, as it can be a bit inconsistent. The truth is, this blank run is a bit more normal for the area, so don't panic. It tends not to stay this poor for long, and the forecasts can change. I wouldn't even bother looking at the water for the next two weeks, lads. It's a no-go.
Rusty.
Short Range ForecastMostly dry. Very mild (max 19°C on Sun afternoon, min 11°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 19°C on Fri afternoon, min 13°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sun 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | ||||||||||||||
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) | S 10 | N 4 | N 5 | N 5 | N 6 | N 5 | N 5 | N 6 | NNW 6 | NNW 6 | N 6 | N 5 | N 5 | N 4 | S 13 | S 13 | — | S 12 | NW 4 | S 11 |
Wave Graph  | ||||||||||||||||||||
 kJ | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 3 | 0 | 5 | 7 | 2 |
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 | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 2:00AM3.97m | 2:34PM3.37m | 2:51AM3.65m | 3:28PM3.18m | 3:49AM3.33m | 4:30PM3.04m | 4:56AM3.09m | 5:37PM2.97m | 6:08AM2.98m | 6:44PM3.01m | 7:16AM2.99m | 7:44PM3.13m | ||||||||
Low Tide | 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 | 1:01PM1.37m | 1:39AM1.32m | 2:06PM1.28m | 2:38AM1.14m | |||||||
 |  |  | |  | | | | | | | | | | | | | | |  | |
 | — | — | 5:15 | — | — | 5:16 | — | — | 5:18 | — | — | 5:18 | — | — | 5:20 | — | — | 5:22 | — | — |
 | — | 9:32 | — | — | 9:31 | — | — | 9:30 | — | — | 9:29 | — | — | 9:28 | — | — | 9:25 | — | — | 9:24 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 15 | 15 | 15 | 15 | 14 | 16 | 13 | 15 | 18 | 16 | 14 | 17 | 17 | 16 | 19 | 18 | 15 | 16 | 17 |
Feels °C | 16 | 13 | 12 | 11 | 13 | 12 | 13 | 11 | 12 | 15 | 13 | 11 | 14 | 15 | 15 | 18 | 17 | 12 | 13 | 17 |
Swell 1 Height (m) Direction Period (s) | S 10 | — | — | — | — | — | — | — | — | — | — | — | — | N 4 | N 4 | N 3 | — | S 12 | S 12 | WNW 3 |
| kJ | 2 | — | — | — | — | — | — | — | — | — | — | — | — | 6 | 1 | 1 | — | 3 | 3 | 1 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 13 | S 13 | — | — | — | S 11 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 3 | — | — | — | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 4 | N 4 | N 5 | N 5 | N 6 | N 5 | N 5 | N 6 | NNW 6 | NNW 6 | N 6 | N 5 | N 5 | N 3 | — | — | — | WNW 3 | NW 4 | SW 2 |
| kJ | 5 | 6 | 25 | 18 | 64 | 25 | 16 | 139 | 155 | 50 | 98 | 25 | 11 | 1 | — | — | — | 5 | 7 | 1 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 284 | 272 | 284 | 357 | 283 | 317 | 352 | 53 | 53 | 302 | 53 | 260 | 357 | 298 | 261 | 1115 | 420 | 1023 | 596 | 1077 |
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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