Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 8 Aug 2026:
- Most powerful swell: Sunday 9 Aug, 7PM (local time) - 1.5ft (0.4m), 6s period, SW swell with 9 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 0.4m 6s and forecast to arrive on Sunday (Aug 09) at 7PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Saturday (Aug 15) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Sun 9th Aug) | 1.5ft (0.4m) 6s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Well, folks, it’s Rusty here, and I’ve gotta be straight with you: the next couple of weeks are looking pretty grim for a paddle. We’re staring down a long stretch of flat, messy, and just plain unsurfable conditions at Cable Bay (Porth Trecastell). There are no good surf options on the table for the entire 16-day window, so if you’re jonesing for a wave, you might want to find another hobby for a bit.
To give you an idea of the drought, from Saturday the 8th right through to Saturday the 22nd, there isn't a single session that gets a thumbs-up from me. That’s a solid two-week gap. The swell is mostly tiny, and when there is a little bump in the water, the wind is all over it, chopping it up or blowing straight onshore. It’s the kind of surf that’ll have you questioning why you even brought your board.
The one bright spot, if you can call it that, is a small pulse of swell arriving on Monday the 17th. It’s not big—around 3ft—with a short period of 4 seconds, so it’s lacking any punch. The wind is offshore (NNW) though, and the energy is a weak 20, so the surface might be glassy. But honestly, with that period, it’s going to be pretty weak and crumbly. Not worth getting excited about.
Then on Saturday the 22nd, things get a bit more serious but not in a good way. We’re looking at a stormy 4ft of swell from the SW, but the wind is howling at 25 mph from the west, making it a complete mess. The energy is a moderate 76, but with that wind, it’s going to be blown-out junk. This is more of a kite-surfing setup than a paddle-surfing one.
One thing to note, the water temp on that first Saturday the 8th is sitting at 63°F, which is a touch warmer than the usual for this time of year. Not a big deal, but worth knowing if you’re in a wetsuit.
So, my honest advice? Save your energy. This is a blank run, and it looks like it’s going to stay that way for a while. Forecasts can always change, but I wouldn’t hold my breath. We’ll just have to wait for a better pulse of energy that lines up with some decent winds.
Stay dry, folks.
Rusty.
Short Range ForecastMostly dry. Very mild (max 18°C on Sun afternoon, min 13°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Thu night. Warm (max 24°C on Wed afternoon, min 17°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | |||||||||||||||
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) | SSW 4 | SSW 4 | SW 4 | S 12 | SSW 6 | S 10 | S 8 | SSW 6 | SSW 6 | SW 6 | SW 6 | S 11 | SW 12 | SSW 4 | SSW 4 | SW 3 | SW 11 | SW 4 | SW 4 | SSW 5 | SW 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 8 | 9 | 6 | 3 | 6 | 2 | 1 | 3 | 4 | 1 | 1 | 2 | 6 | 6 | 3 | 4 | 5 | 2 | 5 | 2 | 1 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | on | on | cross-off | cross-off | cross-off | off | cross-on | cross-on | cross | cross-on | cross-on | cross-on | on | cross-on | cross | cross-on | cross-on | cross-off |
High Tide | 5:53PM3.16m | 6:34AM3.25m | 7:10PM3.38m | 7:48AM3.43m | 8:14PM3.71m | 8:49AM3.66m | 9:07PM4.05m | 9:40AM3.86m | 9:54PM4.35m | 10:25AM4.00m | 10:38PM4.54m | 11:07AM4.05m | 11:19PM4.59m | ||||||||
Low Tide | 12:19PM1.13m | 1:01AM1.07m | 1:38PM0.97m | 2:14AM0.73m | 2:42PM0.68m | 3:13AM0.33m | 3:34PM0.38m | 4:04AM-0.04m | 4:20PM0.13m | 4:50AM-0.29m | 5:04PM-0.02m | 5:34AM-0.40m | 5:45PM-0.06m | ||||||||
 |  |  | | | | | |  | | | | | | | | |  |  | | | |
 | 5:45 | — | — | 5:47 | — | — | 5:48 | — | — | 5:50 | — | — | 5:52 | — | — | 5:52 | — | — | 5:54 | — | — |
 | — | — | 9:00 | — | 8:58 | — | — | 8:57 | — | — | 8:54 | — | — | 8:52 | — | — | 8:50 | — | — | 8:47 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — |
Temp °C | 16 | 17 | 16 | 17 | 18 | 17 | 15 | 17 | 17 | 22 | 23 | 22 | 23 | 24 | 23 | 22 | 22 | 19 | 19 | 20 | 16 |
Feels °C | 12 | 13 | 13 | 16 | 16 | 16 | 13 | 14 | 14 | 19 | 20 | 21 | 19 | 21 | 21 | 20 | 21 | 19 | 19 | 20 | 13 |
Swell 1 Height (m) Direction Period (s) | SW 11 | S 11 | SW 7 | SW 3 | SSW 6 | SW 3 | SW 4 | SSW 6 | SSW 6 | SW 6 | SW 6 | SSW 4 | SW 12 | SW 12 | SW 9 | SW 8 | SW 8 | SW 4 | SW 4 | SSW 5 | SW 5 |
| kJ | 5 | 2 | 2 | 2 | 3 | 2 | 1 | 3 | 4 | 1 | 1 | 2 | 6 | 6 | 3 | 3 | 3 | 2 | 5 | 2 | 1 |
Swell 2 Height (m) Direction Period (s) | — | — | S 11 | SW 6 | — | SW 6 | SW 6 | SW 8 | — | — | — | SW 6 | S 6 | — | SW 5 | SW 10 | SW 11 | SW 6 | — | — | — |
| kJ | — | — | 2 | 2 | — | 1 | 1 | 2 | — | — | — | 1 | 1 | — | 1 | 4 | 4 | 2 | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | S 11 | S 12 | SW 12 | S 10 | S 8 | — | — | — | — | S 11 | S 6 | SW 12 | SW 5 | — | SW 11 | SW 8 | — | — | — |
| kJ | — | — | 2 | 3 | 6 | 2 | 1 | — | — | — | — | 2 | 1 | 5 | 1 | — | 5 | 2 | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 4 | SSW 4 | SW 4 | — | — | NNW 2 | NNW 3 | NNW 4 | — | SSE 3 | — | — | SSW 3 | SSW 4 | SSW 4 | SW 3 | SSW 3 | — | NW 3 | N 3 | N 3 |
| kJ | 8 | 9 | 6 | — | — | 1 | 2 | 3 | — | 1 | — | — | 4 | 6 | 3 | 2 | 1 | — | 2 | 1 | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 256 | 261 | 256 | 259 | 261 | 261 | 261 | 285 | 256 | 277 | 316 | 176 | 227 | 179 | 150 | 173 | 264 | 172 | 185 | 506 | 187 |
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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