Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 11 Sep 2026:
- Most powerful swell: Saturday 12 Sep, 10AM (local time) - 7ft (2.1m), 7s period, SW swell with 391 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 2.1m 7s and forecast to arrive on Saturday (Sep 12) at 10AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Wednesday (Sep 16) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Sat 12th Sep) | 7ft (2.1m) 7s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what the next couple of weeks are serving up for us.
Straight up, we’ve got a long, quiet stretch ahead. It’s going to be a real waiting game. There’s no surf on offer at all for the first week and a half, from Friday morning right through to late on Saturday the 19th of September. That's over a week of flat, unrideable conditions. You can leave the boards in the shed.
Looking through the doldrums, we finally get a little flicker of life on Sunday the 20th of September. Cable Bay (Porth Trecastell) is our only real option, and it’s for the morning. It’s not going to set the world on fire, but it’s the best we’ve got in this window. You’ll find some small, clean waves around 4ft from the SSW, with a short period of 5 seconds, so it’ll be a bit weak and soft. The combined swell energy is weak (87). What makes it worth a look is the clean conditions—cross-offshore wind early on, and the water’s a touch warmer than normal at 62°F. It’s a fairly consistent spot though, so you might get a couple of fun ones if you’re keen for a paddle.
Beyond that Sunday, it’s right back to flatness and tiny, useless dribble for the rest of the 16-day window. Honestly, for a stretch this long with so little to offer, this is a pretty normal blank run for the area. The forecasts can change, but right now, there’s not much to get excited about.
Rusty
Short Range ForecastLight rain (total 8mm), mostly falling on Sat morning. Very mild (max 17°C on Sat afternoon, min 14°C on Fri afternoon). Mainly strong winds. | Days 4-6 Weather SummaryHeavy rain (total 35mm), heaviest during Mon night. Very mild (max 17°C on Mon morning, min 12°C on Tue night). Mainly fresh winds. | ||||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | |||||||||||||||
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 6 | SW 6 | SSW 4 | SW 7 | SW 7 | SW 6 | SSW 6 | SW 6 | SSW 4 | SW 5 | SSW 6 | SSW 6 | SSW 6 | SW 5 | SW 5 | S 11 | W 4 | WSW 5 | WSW 6 | SW 6 | SW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 34 | 19 | 29 | 391 | 352 | 108 | 26 | 18 | 11 | 62 | 171 | 309 | 39 | 13 | 1 | 2 | 5 | 57 | 129 | 106 | 54 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | on | on | on | cross-off | on | cross-on | cross-on | on | on | cross | cross | cross-off | cross | on | on | cross-on | cross-on | cross-on |
High Tide | 10:06AM4.03m | 10:17PM4.51m | 10:42AM4.11m | 10:54PM4.52m | 11:16AM4.11m | 11:30PM4.39m | 11:50AM4.02m | 00:07AM4.16m | 12:24PM3.85m | 00:44AM3.84m | 1:00PM3.60m | 1:24AM3.48m | 1:40PM3.31m | 2:09AM3.11m | |||||||
Low Tide | 4:43PM-0.03m | 5:10AM-0.34m | 5:22PM-0.06m | 5:48AM-0.24m | 5:59PM0.01m | 6:23AM-0.01m | 6:35PM0.19m | 6:58AM0.30m | 7:12PM0.44m | 7:33AM0.66m | 7:49PM0.75m | 8:09AM1.03m | 8:30PM1.08m | ||||||||
 |  |  |  | | |  | |  |  | |  | | | | | | | | | | |
 | 6:43 | — | — | 6:45 | — | — | 6:47 | — | — | 6:48 | — | — | 6:50 | — | — | 6:52 | — | — | 6:54 | — | — |
 | — | 7:44 | — | — | 7:42 | — | — | 7:38 | — | — | 7:37 | — | — | 7:35 | — | — | 7:31 | — | — | 7:30 | — |
mm | — | — | 1 | 4 | — | 3 | — | — | — | 11 | — | 21 | — | — | — | — | — | 3 | — | — | — |
Temp °C | 15 | 15 | 15 | 16 | 17 | 17 | 15 | 16 | 17 | 17 | 17 | 17 | 14 | 16 | 15 | 13 | 15 | 15 | 14 | 15 | 14 |
Feels °C | 12 | 12 | 8 | 10 | 14 | 16 | 15 | 15 | 15 | 15 | 13 | 12 | 10 | 13 | 11 | 9 | 10 | 9 | 8 | 10 | 8 |
Swell 1 Height (m) Direction Period (s) | SW 6 | SW 6 | — | — | — | SW 6 | SSW 6 | SW 6 | — | — | — | — | SSW 6 | WNW 4 | SW 5 | SW 6 | NNW 5 | — | — | SW 6 | SW 7 |
| kJ | 34 | 19 | — | — | — | 108 | 26 | 18 | — | — | — | — | 39 | 12 | 1 | 2 | 27 | — | — | 106 | 54 |
Swell 2 Height (m) Direction Period (s) | — | N 4 | — | — | — | — | NNW 4 | N 4 | — | — | — | — | — | SW 5 | — | S 11 | SW 5 | — | — | — | — |
| kJ | — | 3 | — | — | — | — | 2 | 3 | — | — | — | — | — | 13 | — | 2 | 1 | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 6 | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NW 4 | WNW 4 | SSW 4 | SW 7 | SW 7 | — | — | — | SSW 4 | SW 5 | SSW 6 | SSW 6 | WNW 3 | — | NW 5 | NNW 6 | W 4 | WSW 5 | WSW 6 | NW 4 | NW 5 |
| kJ | 17 | 5 | 29 | 391 | 352 | — | — | — | 11 | 62 | 171 | 309 | 5 | — | 119 | 115 | 5 | 57 | 129 | 12 | 42 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 173 | 44 | 261 | 261 | 244 | 96 | 173 | 173 | 179 | 256 | 287 | 272 | 185 | 1525 | 185 | 187 | 506 | 773 | 541 | 541 | 173 |
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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