Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 22 Aug 2026:
- Best quality surf: Thursday 27 Aug, 7PM (local time) - 7ft (2.1m), 6s period, WSW swell with offshore winds.
- Most powerful swell: Thursday 27 Aug, 7PM (local time) - 7ft (2.1m), 6s period, WSW swell with 333 kJ wave energy.
- Next surfable swell (1★+): Thursday 27 Aug, 4PM (local time) - 5.5ft (1.7m), 5s period with WSW swell.
Best Forecast Surf Conditions for Cable Bay (Porth Trecastell) this week:
The surf forecast for Cable Bay (Porth Trecastell) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 27) at 4PM. The primary swell is predicted to be 1.7m and 5s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Cable Bay (Porth Trecastell) in the next 16 days are 2.1m 6s and forecast to arrive on Thursday (Aug 27) at 7PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 5s period and expected on Saturday (Aug 22) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4PM (Thu 27th Aug) | 5.5ft (1.7m) 5s |
| Best Surf | 7PM (Thu 27th Aug) | 7ft (2.1m) 6s |
| Most Powerful | 7PM (Thu 27th Aug) | 7ft (2.1m) 6s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Gotta be straight with you – the next couple of weeks are looking pretty grim for a paddle. We’ve got a long dry spell to get through before anything worth getting wet for shows up.
Looking at the whole window, the pattern is mostly small, weak swell with poor wind. For the first week and a half, from now right through to the end of August and into the first days of September, the surf is basically flat. You’ll be staring at ankle-biters with almost no energy – the combined energy readings are stuck in the single digits and teens for days on end (like 8, 16, 12). It’s clean and glassy on a few mornings, like Monday the 24th, but with only 0.3ft of swell, there’s nothing to ride. There’s a long gap here where you just won’t be surfing.
Things finally try to wake up a bit around Thursday, September 3rd. The standout in this whole sorry outlook is Cable Bay (Porth Trecastell) on that Thursday morning. We’re looking at the biggest swell of the period, a solid 7ft from the SSW. That’s pushing into expert-only territory for size. The combined energy hits a whopping 1277, so there’s serious power behind it. However, it’s coming in with a moderate cross-shore breeze and the period is a long 10 seconds. While that long period will bring better shaped waves, it’s a beach break, so long period swells can close out a bit straight. Honestly, with that much power and cross-chop, this setup looks more interesting for the kite crew than a standard paddle session. It’s a marginal call.
The following Friday, September 4th, offers a slight consolation. Gentle offshore winds from the NE will clean things up, with a more manageable 3ft swell from the SSW. The energy is moderate at 144. It’s surfable, but nothing to write home about after that big, messy Thursday. After that, it drops right back off again into the flat zone.
So, bottom line: there are no good, clean, all-round surf options in the 16-day window. Thursday the 3rd is the only real pulse of size, but conditions spoil it. Keep your gear waxed and ready; forecasts can change, but as it stands, it’s a blank run.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Mon afternoon, min 12°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 30mm), heaviest during Wed afternoon. Warm (max 21°C on Tue afternoon, min 14°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | |||||||||||||||
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 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 9 | SW 13 | SW 13 | SW 13 | SSW 8 | SW 8 | SW 8 | S 4 | SSW 7 | WSW 5 | WSW 5 | SSW 6 | SSW 6 | SW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 8 | 8 | 8 | 8 | 7 | 8 | 8 | 3 | 7 | 7 | 7 | 7 | 17 | 15 | 13 | 50 | 156 | 62 | 35 | 24 | 12 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | off | glassy | cross-off | cross-off | cross-off | off | cross-off | cross-on | glassy | cross-on | cross-on | glassy | cross-off | cross | cross-on | cross-off |
High Tide | 5:38AM2.76m | 6:19PM2.84m | 7:04AM2.82m | 7:32PM3.02m | 8:05AM2.99m | 8:24PM3.28m | 8:49AM3.20m | 9:03PM3.55m | 9:25AM3.40m | 9:35PM3.81m | 9:55AM3.58m | 10:04PM4.02m | 10:23AM3.73m | 10:32PM4.18m | |||||||
Low Tide | 12:20PM1.61m | 1:12AM1.48m | 1:41PM1.46m | 2:17AM1.25m | 2:33PM1.20m | 3:02AM0.96m | 3:12PM0.93m | 3:39AM0.68m | 3:47PM0.67m | 4:13AM0.41m | 4:20PM0.46m | 4:45AM0.20m | 4:53PM0.30m | ||||||||
 | |  | | | |  | |  |  | | |  |  |  | |  | | | | | |
 | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — |
 | — | 8:30 | — | — | 8:29 | — | — | 8:27 | — | — | 8:23 | — | — | 8:22 | — | — | 8:20 | — | — | 8:16 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 19 | 5 | — | 5 | 1 | — | — | — |
Temp °C | 14 | 14 | 14 | 16 | 17 | 18 | 19 | 21 | 19 | 19 | 21 | 19 | 16 | 19 | 17 | 19 | 19 | 16 | 16 | 16 | 16 |
Feels °C | 10 | 9 | 11 | 14 | 14 | 15 | 17 | 19 | 14 | 18 | 18 | 14 | 16 | 19 | 14 | 17 | 20 | 15 | 15 | 15 | 16 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 10 | S 4 | SW 13 | SW 8 | SW 8 | NE 5 | SW 8 | SW 8 | SSW 7 | SSW 7 | NE 4 | SSW 8 | SSW 6 | SSW 6 | SW 6 |
| kJ | 8 | 8 | 8 | 8 | 7 | 7 | 4 | 1 | 7 | 3 | 3 | 16 | 17 | 15 | 11 | 50 | 1 | 7 | 35 | 24 | 10 |
Swell 2 Height (m) Direction Period (s) | — | — | S 12 | SW 14 | — | SW 11 | SW 14 | SW 9 | SW 9 | SW 13 | — | SSW 8 | SSE 4 | — | S 12 | S 12 | — | — | WNW 4 | S 11 | SSW 11 |
| kJ | — | — | 3 | 8 | — | 5 | 8 | 3 | 3 | 7 | — | 7 | 1 | — | 3 | 3 | — | — | 1 | 3 | 12 |
Swell 3 Height (m) Direction Period (s) | — | — | W 12 | — | — | SW 14 | — | NE 4 | — | NE 5 | SW 13 | S 13 | NNE 4 | NE 4 | W 12 | SW 12 | — | — | NNW 5 | — | — |
| kJ | — | — | 3 | — | — | 8 | — | 1 | — | 1 | 7 | 3 | 2 | 1 | 3 | 5 | — | — | 3 | — | — |
Wind waves Height (m) Direction Period (s) | NNW 5 | NNW 5 | N 5 | NNW 4 | NNW 4 | NE 2 | — | — | ENE 3 | ENE 5 | NE 5 | ESE 3 | SE 3 | SSE 2 | S 4 | — | WSW 5 | WSW 5 | — | NNW 2 | WSW 3 |
| kJ | 25 | 24 | 16 | 6 | 3 | 1 | — | — | 4 | 15 | 12 | 2 | 1 | 1 | 13 | — | 156 | 62 | — | 1 | 3 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 180 | 284 | 180 | 272 | 295 | 158 | 256 | 259 | 211 | 286 | 258 | 260 | 260 | 283 | 212 | 179 | 0 | 0 | 44 | 332 | 168 |
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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