Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 7 Aug 2026:
- Most powerful swell: Saturday 8 Aug, 1PM (local time) - 2.5ft (0.7m), 4s period, SSW 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 0.7m 4s and forecast to arrive on Saturday (Aug 08) 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 0.4m 3s period and expected on Friday (Aug 14) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Sat 8th Aug) | 2.5ft (0.7m) 4s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let's be real with you. I've looked at the charts for our stretch of coast, and it's a bit of a tough stretch ahead. We’ve got a long, flat spell on the horizon, so don't be in a rush to load up the boards.
The next week and a half is looking pretty grim. There is just no energy in the water. We’re talking knee-high dribble, if you can even call it that. The swell is tiny, and the winds aren't doing us any favors. There will be days where it’s almost completely flat, like the 11th, when the morning is glassy but there's simply nothing to ride. You’re better off checking the tides for a good beach walk than paddling out. This flat spell is going to stretch on for a good ten days, so patience is key. We are seeing water temps near 63°F, which is a touch warmer than normal for this time of year, but that won't help you get a wave.
Then, around the 19th, things start to get interesting. The models are hinting at a pulse of new energy from the southwest, finally. The period is still short, so it won't be world-class, but it's something. The morning of Wednesday the 19th looks like the one to watch. Swell heights are picking up to around 4ft with a 6-second period from the SW. The wind is forecast to be light and offshore from the NNE, which will make the conditions glassy and clean. This will be one of the few times the conditions match up. It won’t be epic, but it's rideable. The wave energy is still only moderate right now at 168, but it’s more than we’ve seen in a long time.
It looks like we get another pulse on the 21st, two days later. The swell is forecast to be a bit bigger, pushing 6ft from the WNW, and the energy is moderate at 221. However, the wind is going to swing around to the onshore WSW, making things messy. So while there’s more size, it’s likely to be a bit of a washing machine out there. This one is probably better for the more experienced heads who don't mind some chop. After that, it fades back down again quickly.
So mark your calendar for the morning of the 19th. It’s your best bet for a clean, if not perfect, wave. The bigger swell on the 21st will have more push, but the onshore wind will make it a grunt. It's not a blockbuster forecast, but after this flat spell, we'll take what we can get.
Rusty, out.
Short Range ForecastMostly dry. Very mild (max 19°C on Sun afternoon, min 14°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 24°C on Tue afternoon, min 15°C on Mon morning). Wind will be generally light. | ||||||||||||||||||||
Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | |||||||||||||||
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 4 | SW 5 | SW 4 | SSW 4 | SW 4 | SW 4 | SW 12 | SW 12 | SW 6 | SW 6 | SSW 6 | SW 7 | SW 6 | SW 6 | S 11 | SW 12 | SSW 4 | SSW 3 | SW 3 | SW 8 | S 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 6 | 6 | 8 | 11 | 7 | 7 | 5 | 6 | 1 | 1 | 3 | 2 | 2 | 1 | 3 | 5 | 4 | 3 | 3 | 3 | 2 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross-on | on | cross-on | on | on | cross | cross | cross | off | glassy | cross-on | cross | cross-on | cross-on | cross-on | on | on | on |
High Tide | 4:28PM3.12m | 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 | ||||||||
Low Tide | 10:55AM1.10m | 11:32PM1.22m | 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 | ||||||||
 | |  |  | | |  | | | | |  | | | | | | | | | | |
 | 5:43 | — | — | 5:45 | — | — | 5:47 | — | — | 5:48 | — | — | 5:50 | — | — | 5:52 | — | — | 5:52 | — | — |
 | — | — | 9:01 | — | — | 9:00 | — | 8:58 | — | — | 8:57 | — | — | 8:54 | — | — | 8:52 | — | — | 8:50 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 17 | 15 | 17 | 17 | 16 | 17 | 19 | 18 | 16 | 18 | 17 | 22 | 24 | 23 | 24 | 24 | 20 | 18 | 20 | 19 |
Feels °C | 14 | 14 | 12 | 14 | 13 | 13 | 16 | 18 | 18 | 13 | 15 | 15 | 20 | 22 | 22 | 20 | 20 | 17 | 19 | 21 | 19 |
Swell 1 Height (m) Direction Period (s) | SW 4 | WNW 3 | SW 12 | SW 11 | S 11 | SW 7 | SW 6 | SW 6 | — | SW 4 | SSW 6 | SW 6 | SW 6 | SW 6 | SW 6 | SW 12 | SSW 4 | SW 9 | SSW 3 | SSW 3 | SW 7 |
| kJ | 4 | 1 | 5 | 5 | 2 | 2 | 2 | 1 | — | 1 | 3 | 1 | 2 | 1 | 1 | 5 | 3 | 3 | 1 | 1 | 2 |
Swell 2 Height (m) Direction Period (s) | NW 3 | S 12 | W 12 | — | — | S 11 | SW 12 | SW 12 | SW 6 | SW 6 | S 8 | SW 7 | — | — | S 11 | S 6 | SW 10 | W 5 | SW 8 | SW 8 | SW 4 |
| kJ | 2 | 3 | 3 | — | — | 2 | 5 | 6 | 1 | 1 | 1 | 2 | — | — | 3 | 1 | 4 | 1 | 3 | 3 | 1 |
Swell 3 Height (m) Direction Period (s) | SW 12 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 6 | — | — | — | — | S 11 |
| kJ | 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | 2 |
Wind waves Height (m) Direction Period (s) | SW 4 | SW 5 | SW 4 | SSW 4 | SW 4 | SW 4 | SW 3 | SSW 3 | — | — | — | — | — | — | — | SSW 3 | — | SSW 3 | SW 3 | WSW 3 | — |
| kJ | 5 | 6 | 8 | 11 | 7 | 7 | 3 | 1 | — | — | — | — | — | — | — | 3 | — | 3 | 2 | 1 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 261 | 261 | 256 | 256 | 256 | 261 | 261 | 261 | 261 | 256 | 285 | 259 | 277 | 316 | 233 | 227 | 302 | 172 | 185 | 302 | 172 |
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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