Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 4 Jul 2026:
- Most powerful swell: Saturday 4 Jul, 1PM (local time) - 3.5ft (1.1m), 5s period, SW swell with 63 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 1.1m 5s and forecast to arrive on Saturday (Jul 04) at 1PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Friday (Jul 10) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Sat 4th Jul) | 3.5ft (1.1m) 5s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
Updates in hr min s Forecast update imminent
Alright folks, Rusty here. Let's have a proper look at what Cable Bay (Porth Trecastell) has in store for us over the next couple of weeks. To be straight with you, it’s a tough stretch ahead.
Right now, the water is sitting at about 61°, which is a touch warmer than normal for this time of year, so the wetsuit might feel a little more forgiving if you do get in. But honestly, the surf is not playing ball. We kick off Saturday, July 4th, with a messy, onshore SW wind at 19 mph and a weak, short-period 4ft swell that’s just all over the place. The combined energy is a paltry 50, so it’s weak and poor. That continues right through Sunday with smaller, even weaker waves.
Monday the 6th is tiny, barely a ripple, and Tuesday is just as flat with light cross-on winds. We’ve got a real dry spell here. From Wednesday the 8th all the way through to Friday the 17th of July, it’s mostly flat. There are a few moments with a tiny pulse of long-period groundswell (a few seconds over 10-11 seconds), but it’s barely breaking at 0.3ft. While the winds turn offshore and clean on occasion from the 9th, with some glassy conditions on Saturday the 11th, there’s just no push in the water to ride. The combined energy is mostly a 0, 1, or 2 during that entire run. It’s a long, frustrating gap with no real waves to recommend.
The best we see, and I’m using that term loosely, is the very tail end of the outlook. On Saturday, July 18th, we get a tiny pulse from the south with a period of 13 seconds and some clean, cross-offshore NNW wind at 12-16 mph. The swell is only 0.3ft, so it’s barely a ripple on the surface. The combined energy is still a weak 3. It’s the cleanest conditions of the whole outlook, but there’s almost no wave to ride.
To be honest, there isn't a standout day here. The whole two weeks look poor. If you absolutely have to get wet, that Saturday the 18th offers the cleanest conditions, but you’ll be fighting for a ripple on a long-period groundswell, which at a beach setup like Cable Bay might just wall up and close out that tiny amount of energy. It’s not worth getting excited about. This is a proper flat spell for the area.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Sat afternoon, min 16°C on Sat night). Winds decreasing (fresh winds from the SW on Sat morning, light winds from the SSW by Mon night). | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Thu morning, min 16°C on Tue morning). Wind will be generally light. | ||||||||||||||||||||
Saturday 4 | Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | |||||||||||||||
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 5 | SW 5 | WSW 5 | SW 6 | SW 4 | SW 4 | SW 4 | SSW 3 | SW 5 | NW 4 | NW 4 | S 12 | — | — | — | S 11 | — | NE 3 | S 10 | S 5 | NE 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 47 | 58 | 39 | 20 | 12 | 9 | 5 | 6 | 23 | 8 | 4 | 3 | 0 | 0 | 0 | 3 | 0 | 0 | 2 | 1 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | on | on | on | on | on | cross-on | cross-on | on | cross-on | on | cross-on | off | off | off | cross | cross-off | off | cross-off |
High Tide | 12:48PM3.35m | 1:02AM3.78m | 1:25PM3.28m | 1:39AM3.69m | 2:08PM3.22m | 2:23AM3.59m | 2:59PM3.16m | 3:15AM3.47m | 4:00PM3.13m | 4:19AM3.39m | 5:08PM3.17m | 5:31AM3.38m | 6:16PM3.29m | ||||||||
Low Tide | 7:31PM0.73m | 8:04AM0.60m | 8:10PM0.86m | 8:45AM0.69m | 8:52PM1.00m | 9:30AM0.79m | 9:42PM1.13m | 10:22AM0.89m | 10:42PM1.21m | 11:26AM0.95m | 11:55PM1.20m | 12:38PM0.92m | 1:12AM1.03m | ||||||||
 | |  | | | | |  | | | |  | |  | | | | | | | | |
 | 4:56 | — | — | 4:58 | — | — | 4:58 | — | — | 4:58 | — | — | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — |
 | — | — | 9:46 | — | — | 9:45 | — | — | 9:45 | — | — | 9:45 | — | — | 9:44 | — | — | 9:43 | — | — | 9:43 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 21 | 19 | 17 | 19 | 19 | 18 | 19 | 18 | 18 | 20 | 20 | 20 | 21 | 21 | 26 | 26 | 25 | 26 | 27 | 25 |
Feels °C | 14 | 18 | 17 | 16 | 17 | 18 | 16 | 16 | 17 | 16 | 18 | 18 | 20 | 21 | 20 | 26 | 25 | 23 | 24 | 24 | 21 |
Swell 1 Height (m) Direction Period (s) | NW 4 | — | — | NW 4 | WNW 4 | SW 4 | NW 4 | — | SW 5 | NW 4 | NW 4 | S 12 | — | — | — | S 11 | — | NE 3 | S 3 | — | — |
| kJ | 3 | — | — | 4 | 1 | 9 | 2 | — | 23 | 8 | 4 | 3 | — | — | — | 3 | — | 3 | 1 | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | NW 4 | — | — | — | — | — | SW 4 | — | — | — | — | — | — | — | — | S 10 | — | — |
| kJ | — | — | — | 3 | — | — | — | — | — | 5 | — | — | — | — | — | — | — | — | 2 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | S 12 | — | — | — | — | — | — | — | — | S 5 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 3 | — | — | — | — | — | — | — | — | 1 | — |
Wind waves Height (m) Direction Period (s) | SW 5 | SW 5 | WSW 5 | SW 6 | SW 4 | NW 4 | SW 4 | SSW 3 | WNW 4 | — | SSW 4 | SW 3 | — | — | — | — | — | — | NE 4 | NE 4 | NE 5 |
| kJ | 47 | 58 | 39 | 20 | 12 | 4 | 5 | 6 | 5 | — | 2 | 3 | — | — | — | — | — | — | 5 | 29 | 43 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 381 | 412 | 185 | 187 | 299 | 294 | 261 | 258 | 302 | 244 | 244 | 256 | 246 | 246 | 246 | 246 | 258 | 233 | 246 | 258 | 106 |
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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