Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 5 Aug 2026:
- Most powerful swell: Wednesday 5 Aug, 1PM (local time) - 5ft (1.6m), 6s period, WSW swell with 161 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 1.6m 6s and forecast to arrive on Wednesday (Aug 05) at 1PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 6s period and expected on Thursday (Aug 06) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Wed 5th Aug) | 5ft (1.6m) 6s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright, let’s get this straight. I’ve had a look at the charts for the next couple of weeks, and honestly, it’s a pretty grim picture for Cable Bay (Porth Trecastell). There’s no good surf on the horizon for the entire 16-day window. The first real pulse of energy we see is around the 4th, but it’s a weak, short-period wind swell from the SSW and the wind is howling cross-onshore. That’s a mess. The water is a touch warmer than normal for this time of year, about 62°F, which is a small consolation, but it won’t make the waves any better.
The pattern stays locked in this poor state for nearly two weeks. We get a bit more size on the 5th with a 5ft W swell, but again, the wind is fresh and cross-onshore, making it lumpy and uninviting. There’s a brief moment on the 10th where the wind turns light and cross-offshore, but the swell has collapsed to a dribble of 2ft. It’s clean, but there is nothing to ride. From the 11th through the 13th, it goes completely flat. A proper blank run.
Things get a little more interesting way out there, around the 14th. That’s over a week from now, so take this with a grain of salt, but there’s a more solid swell showing up. The 14th morning has a 4ft SSW swell and light offshore winds, which is the only time in the whole run that looks like it might offer an actual wave. The energy is still modest, but the conditions are clean. The afternoon bumps up to 5ft, but the wind goes cross-shore, and we lose the quality.
The 15th has similar size, but the wind is back to cross-onshore, so it’s going to be messy. The last glimmer of hope is on the morning of the 16th, but it’s small and the wind is onshore. After that, it just fades back into nothing.
So, if you’re desperate, the morning of the 14th is your only real shot, and even that is a gamble being so far out. It’s one of those times where the beach breaks will be junk, and it might honestly be more interesting for the kite surfers than us paddle surfers for most of this stretch. The longer period swells we see are too small to do anything with. It’s a waiting game. Forecasts can change, so don’t give up, but don’t hold your breath either.
Rusty
Short Range ForecastLight rain (total 2mm), mostly falling on Wed afternoon. Very mild (max 19°C on Tue afternoon, min 13°C on Wed night). Winds decreasing (fresh winds from the W on Wed morning, calm by Thu night). | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Sun night. Very mild (max 18°C on Sun morning, min 13°C on Sun night). Wind will be generally light. | |||||||||||||||||||
Tue 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | ||||||||||||||
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) | SSW 5 | SSW 5 | W 5 | WSW 5 | WNW 5 | NW 6 | WSW 4 | SW 4 | NW 4 | S 12 | SW 4 | SSW 4 | SSW 4 | SW 5 | SW 4 | SW 7 | W 3 | NW 4 | NW 4 | SW 6 |
Wave Graph  | ||||||||||||||||||||
 kJ | 64 | 49 | 117 | 113 | 133 | 86 | 9 | 9 | 6 | 3 | 18 | 16 | 21 | 34 | 5 | 7 | 6 | 9 | 5 | 1 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross | on | on | cross-on | cross-on | on | cross-on | on | cross-on | cross | cross-off | cross-off | off |
High Tide | 1:48AM3.77m | 2:18PM3.37m | 2:39AM3.55m | 3:15PM3.22m | 3:44AM3.33m | 4:28PM3.12m | 5:06AM3.20m | 5:53PM3.16m | 6:34AM3.25m | 7:10PM3.38m | 7:48AM3.43m | 8:14PM3.71m | ||||||||
Low Tide | 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 | 1:38PM0.97m | 2:14AM0.73m | 2:42PM0.68m | 3:13AM0.33m | |||||||
 |  | |  | |  | |  | | | | | | |  | |  | | | | |
 | — | — | 5:39 | — | — | 5:41 | — | — | 5:43 | — | — | 5:45 | — | — | 5:47 | — | — | 5:48 | — | — |
 | — | 9:07 | — | — | 9:06 | — | — | 9:04 | — | — | 9:01 | — | — | 9:00 | — | 8:58 | — | — | 8:57 | — |
mm | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — |
Temp °C | 19 | 17 | 16 | 16 | 15 | 14 | 15 | 16 | 16 | 17 | 15 | 16 | 17 | 16 | 18 | 18 | 17 | 15 | 16 | 15 |
Feels °C | 16 | 14 | 10 | 11 | 9 | 10 | 12 | 14 | 13 | 14 | 12 | 12 | 13 | 13 | 16 | 15 | 17 | 12 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | — | SSW 5 | — | S 13 | SW 6 | SW 6 | N 5 | SW 4 | NW 4 | WNW 3 | SW 12 | SW 11 | S 11 | SW 5 | SW 4 | SW 7 | SW 6 | — | NW 4 | SW 6 |
| kJ | — | 49 | — | 3 | 19 | 9 | 13 | 9 | 3 | 1 | 5 | 5 | 2 | 34 | 5 | 7 | 2 | — | 5 | 1 |
Swell 2 Height (m) Direction Period (s) | — | SW 7 | — | — | SW 13 | S 13 | S 12 | N 4 | SW 4 | S 12 | — | — | — | SW 8 | SW 7 | NW 3 | — | SW 6 | SSW 6 | — |
| kJ | — | 12 | — | — | 7 | 3 | 3 | 1 | 5 | 3 | — | — | — | 2 | 2 | 2 | — | 1 | 3 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | SW 12 | SW 12 | SW 12 | SW 6 | — | — | S 13 | — | S 12 | SW 12 | — | — | S 12 | — |
| kJ | — | — | — | — | — | — | 6 | 6 | 6 | 1 | — | — | 3 | — | 3 | 6 | — | — | 3 | — |
Wind waves Height (m) Direction Period (s) | SSW 5 | WNW 4 | W 5 | WSW 5 | WNW 5 | NW 6 | WSW 4 | — | — | SW 2 | SW 4 | SSW 4 | SSW 4 | — | NW 3 | — | W 3 | NW 4 | — | — |
| kJ | 64 | 11 | 117 | 113 | 133 | 86 | 9 | — | — | 2 | 18 | 16 | 21 | — | 3 | — | 6 | 9 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 277 | 96 | 504 | 480 | 368 | 283 | 272 | 282 | 282 | 244 | 256 | 256 | 256 | 260 | 333 | 302 | 319 | 287 | 393 | 256 |
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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