Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 8 Aug 2026:
- Most powerful swell: Saturday 8 Aug, 10PM (local time) - 2ft (0.6m), 4s 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 0.6m 4s and forecast to arrive on Saturday (Aug 08) at 10PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Friday (Aug 14) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Sat 8th Aug) | 2ft (0.6m) 4s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright, let’s get into it.
Right off the bat, I’ve gotta be straight with you – it’s a rough stretch ahead for Cable Bay (Porth Trecastell). The next ten days or so are looking mostly flat or blown out. We’ve got a real long wait until anything worth paddling out for shows up.
The first real glimmer of something happens on the morning of Monday the 18th of August. We’ll see a 6ft swell rolling in from the WSW, with a period of 6 seconds. The wind is coming from the NNW at 12 mph, which is a clean cross-offshore breeze. The combined energy of all swells directed here is moderate at 168. That’s the best we’re going to get for a while, but with that short period, it’s going to be a bit fat and weak. Still, it’s clean, and after so many days of nothing, you’ll take it.
The only other spot that catches my eye is the afternoon of Saturday the 22nd of August. We’ve got a 6ft NW swell with a 6-second period, and the wind is from the NNW at 16 mph, so it’s a clean cross-offshore breeze again. The combined energy is 215, which is moderate. The wave comment says “marginal surf forecast or questionable tide conditions,” so it’s a gamble, but it’s the only other shot in the whole 16-day window.
Honestly, for most of the next two weeks, the swell is tiny, or the wind is howling onshore. That period from the 8th to the 17th of August is a total write-off. The 18th and the 22nd are your only real bets, and even then, the swell has a short period, so don’t expect any heavy pits. It’s more of a “get wet and have a few grovelly rides” kind of deal.
Keep an eye on the forecasts, though. It’s been a quiet spell, but as we all know, things can change fast.
Rusty.
Short Range ForecastMostly dry. Very mild (max 18°C on Sun afternoon, min 14°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 28°C on Wed afternoon, min 16°C on Mon 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 | SW 12 | SSW 3 | S 8 | SSW 6 | SW 7 | SW 6 | SW 6 | S 11 | S 4 | SSW 4 | SW 12 | SW 10 | SW 10 | NW 3 | NW 3 | NW 3 | SW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 7 | 9 | 11 | 3 | 6 | 1 | 1 | 3 | 2 | 2 | 1 | 3 | 7 | 6 | 5 | 4 | 4 | 2 | 4 | 3 | 2 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | glassy | on | cross-off | cross-off | cross-off | off | on | cross-on | cross-off | cross-on | on | cross-on | on | cross | cross-off | cross | cross | cross-off |
High Tide | 5:06AM3.20m | 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 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 17 | 16 | 17 | 18 | 16 | 16 | 17 | 18 | 22 | 24 | 23 | 24 | 28 | 22 | 20 | 22 | 20 | 15 | 18 | 17 |
Feels °C | 12 | 13 | 13 | 16 | 16 | 15 | 13 | 14 | 15 | 19 | 21 | 21 | 21 | 25 | 20 | 19 | 21 | 20 | 12 | 15 | 15 |
Swell 1 Height (m) Direction Period (s) | SW 11 | S 11 | SW 7 | SW 3 | SW 6 | SSW 3 | SW 4 | SSW 6 | SW 7 | SW 6 | SW 6 | SW 6 | SW 12 | SSW 4 | SW 9 | SSW 3 | SW 8 | SW 6 | SSW 5 | WNW 3 | SW 6 |
| kJ | 5 | 2 | 2 | 2 | 1 | 1 | 1 | 3 | 2 | 2 | 1 | 1 | 5 | 6 | 3 | 1 | 3 | 2 | 3 | 2 | 1 |
Swell 2 Height (m) Direction Period (s) | — | — | S 11 | SW 6 | — | SW 6 | SW 6 | SW 8 | — | — | — | — | S 12 | SW 10 | SW 12 | SW 8 | — | S 11 | — | SSW 5 | — |
| kJ | — | — | 2 | 2 | — | 1 | 1 | 3 | — | — | — | — | 3 | 4 | 5 | 3 | — | 2 | — | 2 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | S 12 | SW 12 | — | S 8 | — | — | — | — | S 11 | — | S 12 | — | SW 10 | SW 10 | — | S 11 | N 3 | SW 6 |
| kJ | — | — | — | 3 | 6 | — | 1 | — | — | — | — | 3 | — | 3 | — | 4 | 4 | — | 2 | 1 | 2 |
Wind waves Height (m) Direction Period (s) | SSW 4 | SSW 4 | SW 4 | — | — | — | N 3 | N 3 | NE 2 | — | — | — | S 4 | — | SSW 3 | — | WNW 3 | NW 3 | NW 3 | NW 3 | — |
| kJ | 7 | 9 | 11 | — | — | — | 1 | 1 | 1 | — | — | — | 7 | — | 3 | — | 1 | 2 | 4 | 3 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 256 | 261 | 256 | 261 | 333 | 261 | 261 | 295 | 256 | 277 | 316 | 158 | 227 | 179 | 150 | 172 | 277 | 172 | 185 | 597 | 178 |
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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