Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 2 Aug 2026:
- Best quality surf: Friday 7 Aug, 10PM (local time) - 4ft (1.2m), 5s period, SW swell with glassy winds.
- Most powerful swell: Thursday 6 Aug, 1AM (local time) - 7.5ft (2.3m), 6s period, W swell with 399 kJ wave energy.
- Next surfable swell (1★+): Friday 7 Aug, 10PM (local time) - 4ft (1.2m), 5s period with SW swell.
Best Forecast Surf Conditions for Cable Bay (Porth Trecastell) this week:
The surf forecast for Cable Bay (Porth Trecastell) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 07) at 10PM. The primary swell is predicted to be 1.2m and 5s period with a secondary swell of 0.1m and 12s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Cable Bay (Porth Trecastell) in the next 16 days are 2.3m 6s and forecast to arrive on Thursday (Aug 06) at 1AM. 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 Thursday (Aug 06) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Fri 7th Aug) | 4ft (1.2m) 5s |
| Best Surf | 10PM (Fri 7th Aug) | 4ft (1.2m) 5s |
| Most Powerful | 1AM (Thu 6th Aug) | 7.5ft (2.3m) 6s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright, let's have a look at what the next couple of weeks has in store for us here.
Honestly, for Cable Bay, we're looking at a pretty flat spell for a good long while. From the start of the outlook, it's a big ol' gap. We're talking nearly two weeks of next to nothing. The first real sign of life doesn't show up until Saturday the 15th of August, and even then, it's just a whisper. The whole window is a tough one for us.
Let's start with the little window of hope. On the morning of Saturday the 15th, we finally see something paddleable. There will be a weak, short-period swell pushing in at about 3 ft from the west, but it's pretty gutless with a combined energy of only 67. The saving grace is the wind, which is light from the NNW, making for a clean, glassy surface. It's the only time in the whole forecast that even gets a sniff of a recommendation. The water temperature is running about 62°, which is a touch warmer than normal for this time of year, so that's a small bonus for the dawn patrol.
That Saturday morning is the standout, but only because everything else is so poor. The following days drift back into mediocrity with onshore winds and useless swell. For the morning of Monday the 17th, there is a slight bump from the NW at 4 ft, but the wind is a light cross-onshore, making for a messy, marginal session. It's not worth getting excited about.
With nearly all the swell being weak and the wind being rubbish for the vast majority of the forecast, it's one of those periods where you just have to be ready to jump on that tiny window on Saturday the 15th. It's not a classic, but it's the only show in town.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Wed morning. Warm (max 22°C on Mon morning, min 15°C on Tue night). Winds increasing (calm on Mon night, fresh winds from the SSW by Tue afternoon). | Days 5-7 Weather SummaryLight rain (total 8mm), mostly falling on Fri night. Very mild (max 17°C on Wed afternoon, min 13°C on Wed night). Winds decreasing (fresh winds from the W on Wed night, calm by Fri night). | |||||||||||||||||||
Sun 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | ||||||||||||||
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 9 | W 10 | SW 9 | SW 8 | SW 8 | SSW 4 | SSW 5 | SSW 6 | SW 7 | SW 7 | W 6 | SW 6 | SW 6 | SSW 5 | WSW 5 | SSW 4 | SW 6 | SW 5 | SW 6 | SW 5 |
Wave Graph  | ||||||||||||||||||||
 kJ | 3 | 3 | 3 | 11 | 10 | 24 | 72 | 170 | 168 | 152 | 399 | 38 | 23 | 15 | 14 | 19 | 101 | 34 | 21 | 4 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | cross-on | cross | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | on | on | on | on | cross-on | glassy |
High Tide | 00:32AM4.05m | 12:54PM3.59m | 1:07AM3.94m | 1:32PM3.51m | 1:48AM3.77m | 2:18PM3.37m | 2:39AM3.55m | 3:15PM3.22m | 3:44AM3.33m | 4:28PM3.12m | 5:06AM3.20m | 5:53PM3.16m | ||||||||
Low Tide | 7:04PM0.48m | 7:33AM0.34m | 7:41PM0.62m | 8:12AM0.50m | 8:22PM0.79m | 8:55AM0.70m | 9:10PM0.99m | 9:47AM0.92m | 10:11PM1.16m | 10:55AM1.10m | 11:32PM1.22m | 12:19PM1.13m | 1:01AM1.07m | |||||||
 |  |  | | | | |  |  | | | | |  |  | |  | | |  | |
 | — | — | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:41 | — | — | 5:43 | — | — | 5:45 | — | — |
 | — | 9:12 | — | — | 9:09 | — | — | 9:07 | — | — | 9:06 | — | — | 9:04 | — | — | 9:01 | — | — | 9:00 |
mm | — | — | — | — | — | — | — | — | 2 | 1 | — | — | — | 1 | — | — | 3 | 3 | — | — |
Temp °C | 18 | 17 | 22 | 22 | 19 | 19 | 19 | 17 | 16 | 17 | 15 | 14 | 15 | 16 | 15 | 17 | 16 | 15 | 16 | 15 |
Feels °C | 16 | 13 | 20 | 19 | 18 | 15 | 15 | 13 | 11 | 11 | 8 | 10 | 12 | 14 | 13 | 13 | 16 | 13 | 15 | 15 |
Swell 1 Height (m) Direction Period (s) | — | SW 8 | NE 5 | SW 8 | SW 8 | SW 8 | — | — | — | — | S 13 | SW 6 | NNW 5 | SSW 5 | SW 12 | — | SW 12 | SW 5 | SW 6 | SW 5 |
| kJ | — | 3 | 5 | 11 | 10 | 9 | — | — | — | — | 3 | 38 | 23 | 15 | 6 | — | 5 | 34 | 21 | 4 |
Swell 2 Height (m) Direction Period (s) | SW 9 | W 10 | SW 9 | S 3 | — | NE 4 | — | — | — | — | — | — | WNW 4 | NNW 5 | W 12 | S 12 | — | SW 11 | S 11 | NNW 3 |
| kJ | 3 | 2 | 3 | 1 | — | 1 | — | — | — | — | — | — | 6 | 2 | 3 | 3 | — | 5 | 2 | 1 |
Swell 3 Height (m) Direction Period (s) | — | — | — | NE 4 | — | — | — | — | — | — | — | — | S 12 | SW 12 | — | — | — | — | — | — |
| kJ | — | — | — | 1 | — | — | — | — | — | — | — | — | 3 | 6 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | NE 3 | SSE 4 | — | — | SSW 4 | SSW 5 | SSW 6 | SW 7 | SW 7 | W 6 | NW 6 | SW 6 | WNW 3 | WSW 5 | SSW 4 | SW 6 | WNW 4 | WNW 4 | — |
| kJ | — | 9 | 1 | — | — | 24 | 72 | 170 | 168 | 152 | 399 | 115 | 23 | 1 | 14 | 19 | 101 | 20 | 11 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 259 | 158 | 179 | 185 | 233 | 277 | 272 | 277 | 283 | 282 | 368 | 44 | 272 | 212 | 256 | 256 | 105 | 258 | 45 | 158 |
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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