Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 19 Jul 2026:
- Most powerful swell: Saturday 25 Jul, 10PM (local time) - 2.5ft (0.7m), 4s period, SW swell with 17 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 Saturday (Jul 25) at 10PM. Winds are predicted to be 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 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Sat 25th Jul) | 2.5ft (0.7m) 4s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s be straight with you—this next batch of days is a tough one for Cable Bay (Porth Trecastell). We’re looking at a long, dry spell with basically nothing to get excited about.
Right from Sunday the 19th of July, we’ve got a tiny 0.3ft south swell with a long 11-second period, but the energy is weak as dishwater at just (2). The wind is a cross-off, so it’s clean, but there’s just no power to push a wave. That’s your lot for the first week. From Monday the 20th right through to the end of the month, the data shows a massive gap of zero swell. Day after day it’s flat, with the combined energy reading 0. It’s a proper blank run, and for this area, that’s not unusual—it can go quiet, but it tends not to stay poor for long.
We finally see a little pulse on the 26th of July. Sunday morning brings a 3ft SW swell with a short 4-second period, energy at (27) and a fresh cross-onshore wind at 19 mph. That’s lumpy, choppy, and unrideable. The afternoon bumps up to 3ft from the SSW, but with a 5-second period and a moderate cross-onshore, it’s still a mess. Not for us.
The real standout, and I mean the *only* one worth mentioning, comes on Friday the 31st of July. The afternoon session shows a 4ft SW swell with a very short 4-second period, but the energy jumps to (45) and the wind is a light offshore breeze from the ENE at 6 mph. That’s clean. The morning is also offshore but with a tiny 2ft W swell. The afternoon is the best on offer—clean, small, and with that offshore wind. For a beginner, that 4ft is fine, but it’s not a big day. Still, compared to the rest of this forecast, it’s the only window where you might get a fun little wave.
The water temp is about average for the time of year, nothing unusual to report.
So, keep your eyes on the 31st of July afternoon. Everything else is a write-off. Forecasts can change, but right now, it’s just a waiting game.
Rusty.
Short Range ForecastMostly dry. Very mild (max 18°C on Sun afternoon, min 13°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 18°C on Fri afternoon, min 11°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | |||||||||||||||
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) | S 11 | S 10 | S 10 | N 5 | NNW 5 | N 5 | N 5 | N 4 | N 6 | NNW 6 | N 6 | N 6 | NNW 5 | NNW 5 | NNW 5 | S 13 | S 13 | — | S 12 | S 12 | SW 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 3 | 0 | 3 | 3 | 17 |
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-on | cross-on | on | cross-on | on | on |
High Tide | 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 | 6:08AM2.98m | 6:44PM3.01m | 7:16AM2.99m | 7:44PM3.13m | ||||||||
Low Tide | 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 | 1:01PM1.37m | 1:39AM1.32m | 2:06PM1.28m | 2:38AM1.14m | |||||||
 |  |  | | |  | | | | | | | | | | | | |  | |  | |
 | 5:13 | — | — | 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 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 |
Temp °C | 16 | 18 | 15 | 14 | 15 | 16 | 17 | 18 | 15 | 15 | 17 | 15 | 14 | 17 | 16 | 16 | 18 | 17 | 15 | 16 | 17 |
Feels °C | 13 | 15 | 13 | 11 | 11 | 14 | 14 | 15 | 13 | 11 | 13 | 12 | 11 | 14 | 15 | 13 | 17 | 16 | 12 | 12 | 14 |
Swell 1 Height (m) Direction Period (s) | S 11 | S 10 | S 10 | — | — | — | — | — | — | — | — | — | — | NNW 5 | NNW 5 | N 4 | N 4 | — | S 12 | W 3 | SW 5 |
| kJ | 2 | 2 | 2 | — | — | — | — | — | — | — | — | — | — | 18 | 7 | 3 | 1 | — | 3 | 1 | 17 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 13 | — | — | — | S 12 | S 11 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | — | — | — | 3 | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 13 | — | — | S 12 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | — | — | 3 | — |
Wind waves Height (m) Direction Period (s) | N 5 | NNW 4 | N 4 | N 5 | NNW 5 | N 5 | N 5 | N 4 | N 6 | NNW 6 | N 6 | N 6 | NNW 5 | — | — | — | — | — | WNW 3 | — | — |
| kJ | 15 | 9 | 7 | 25 | 27 | 43 | 25 | 15 | 109 | 150 | 80 | 75 | 33 | — | — | — | — | — | 1 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 284 | 284 | 272 | 284 | 357 | 272 | 308 | 352 | 53 | 53 | 590 | 53 | 284 | 516 | 272 | 277 | 1083 | 256 | 261 | 591 | 381 |
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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