Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 11 Jul 2026:
- Most powerful swell: Tuesday 14 Jul, 1PM (local time) - 0.5ft (0.1m), 18s period, SW swell with 12 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 0.1m 18s and forecast to arrive on Tuesday (Jul 14) at 1PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Sunday (Jul 12) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Tue 14th Jul) | 0.5ft (0.1m) 18s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
Right then, let’s have a look at what’s on offer for the next couple of weeks, mate. I’m not gonna lie, the outlook for Cable Bay (Porth Trecastell) is a bit of a quiet one overall. We’ve got a long stretch of very small, pretty much unsurfable conditions to start, so don’t be in a rush to grab your board.
The first week and a half is dominated by tiny, weak pulses. The water temp is a touch warmer than normal for this time of year, sitting at 61°, but that’s about the only highlight. The swell energy is rock bottom, with values barely creeping into double digits. We’re talking 0.3ft to 0.6ft slop from various directions, mostly from the SE and S, with short periods. Even when the wind is offshore and clean, there’s just not enough water moving to push a wave. The conditions are described as poor throughout, with scores of 0. It’s flat out, plain and simple.
There’s a bit of a glimmer right at the tail end of the window. On Sunday the 26th of July, we finally see a pulse of swell. The morning brings a 5ft swell from the WNW with a period of 6 seconds, and the combined energy jumps to 136 (moderate energy). The wind is offshore from the NE at 15 mph, which will keep the surface clean. That’s the best energy we see in the whole 16 days, but it’s only scoring a 1 out of 10. The surf will be surfable, but don’t expect anything special. The afternoon sees that swell drop to 3ft and the energy falls back to 58 (weak energy). The wind stays offshore from the NNE but is a bit lighter.
So, the honest truth is there’s only one day that even registers, and it’s not a standout by any stretch. There’s a massive gap of 14 days from the start of the forecast until we see any real swell. If you’re desperate for a paddle, Sunday the 26th of July is your only real shot, but it’s a gamble. The winds are good, but the swell is short-period and not very clean. It’s a tough run for the area.
Rusty.
Short Range ForecastMostly dry. Warm (max 24°C on Sat afternoon, min 14°C on Sun night). Winds increasing (light winds from the NE on Sat afternoon, fresh winds from the ENE by Mon night). | Days 5-7 Weather SummaryMostly dry. Warm (max 29°C on Wed afternoon, min 19°C on Tue night). Winds decreasing (fresh winds from the ENE on Tue night, calm by Thu night). | ||||||||||||||||||||
Sat 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | N 4 | NNW 4 | NE 5 | NE 4 | NE 5 | SE 4 | S 19 | S 15 | S 18 | SW 18 | SW 14 | SW 16 | SW 16 | SSW 7 | SSW 6 | SW 14 | SW 7 | SW 6 | SW 6 | SW 6 | SW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 0 | 0 | 1 | 7 | 4 | 6 | 12 | 7 | 10 | 10 | 7 | 4 | 8 | 12 | 10 | 10 | 10 | 9 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | off | off | off | off | off | off | off | off | cross-off | off | off | cross-off | cross-off | cross-off | cross | glassy | cross | on | on |
High Tide | 7:20PM3.49m | 7:48AM3.62m | 8:18PM3.75m | 8:48AM3.79m | 9:12PM4.02m | 9:43AM3.93m | 10:03PM4.26m | 10:35AM4.00m | 10:51PM4.43m | 11:24AM3.99m | 11:39PM4.50m | 12:11PM3.90m | 00:25AM4.44m | 12:58PM3.76m | |||||||
Low Tide | 2:21AM0.73m | 2:51PM0.57m | 3:21AM0.38m | 3:45PM0.34m | 4:14AM0.05m | 4:35PM0.16m | 5:04AM-0.20m | 5:21PM0.05m | 5:52AM-0.33m | 6:06PM0.03m | 6:39AM-0.31m | 6:51PM0.12m | 7:25AM-0.16m | ||||||||
 |  |  | |  | | | | | | |  | | | | | | |  |  | | |
 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — | 5:11 | — | — | 5:11 |
 | — | 9:42 | — | — | 9:40 | — | — | 9:39 | — | — | 9:38 | — | — | 9:37 | — | — | 9:37 | — | — | 9:36 | 9:34 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 5 | 1 | — |
Temp °C | 24 | 23 | 23 | 24 | 22 | 20 | 21 | 19 | 21 | 24 | 24 | 25 | 29 | 27 | 25 | 26 | 24 | 21 | 19 | 18 | 18 |
Feels °C | 24 | 20 | 19 | 19 | 18 | 14 | 15 | 13 | 17 | 20 | 19 | 23 | 25 | 23 | 24 | 23 | 21 | 20 | 19 | 19 | 17 |
Swell 1 Height (m) Direction Period (s) | — | NNW 4 | NNW 4 | — | — | SE 4 | S 19 | S 15 | S 18 | S 8 | SW 7 | — | SW 7 | NE 5 | NE 5 | SSW 6 | NE 4 | SW 6 | SW 6 | SW 6 | SW 6 |
| kJ | — | 16 | 3 | — | — | 1 | 7 | 4 | 6 | 1 | 2 | — | 2 | 13 | 8 | 3 | 5 | 10 | 10 | 10 | 9 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | SW 18 | SW 14 | S 6 | SE 4 | SSW 7 | SSW 6 | SW 14 | SW 7 | NNE 4 | NE 4 | — | N 3 |
| kJ | — | — | — | — | — | — | — | — | — | 12 | 7 | 1 | 1 | 4 | 4 | 8 | 12 | 2 | 1 | — | 1 |
Swell 3 Height (m) Direction Period (s) | — | — | NE 5 | — | — | — | S 15 | — | — | — | SW 14 | SW 16 | SW 16 | SW 13 | — | SW 8 | SW 12 | S 12 | SW 12 | SW 12 | SW 11 |
| kJ | — | — | 1 | — | — | — | 4 | — | — | — | 7 | 10 | 10 | 7 | — | 2 | 6 | 3 | 6 | 6 | 5 |
Wind waves Height (m) Direction Period (s) | N 4 | ENE 4 | NE 5 | NE 4 | NE 5 | NE 4 | NE 4 | NE 4 | NE 4 | NNE 4 | NE 6 | NE 5 | NE 5 | SE 4 | — | NNE 4 | — | — | — | — | — |
| kJ | 15 | 6 | 21 | 34 | 41 | 32 | 46 | 17 | 20 | 33 | 61 | 14 | 19 | 7 | — | 4 | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 264 | 258 | 297 | 211 | 306 | 420 | 284 | 294 | 178 | 211 | 295 | 300 | 211 | 296 | 178 | 342 | 221 | 329 | 329 | 329 | 604 |
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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