Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 6 Sep 2026:
- Most powerful swell: Monday 7 Sep, 10PM (local time) - 8ft (2.4m), 6s period, SW swell with 461 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 2.4m 6s and forecast to arrive on Monday (Sep 07) at 10PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Wednesday (Sep 09) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Mon 7th Sep) | 8ft (2.4m) 6s |
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's cookin' for us.
Right, straight up, it's a bit of a grim start to the run. The next week or so is looking pretty rough for Cable Bay (Porth Trecastell). We've got a long stretch of messy, onshore slop with hardly a window for a decent paddle. The wind is just a constant problem – cross-onshore or onshore, often howling from the south or west, just tearing up what little swell there is. For the first several days, the score is a flat zero; it's just poor, lumpy conditions. There's a bit of energy in the water around the 8th (Tuesday) with the combined energy hitting a moderate 309, but with a 25 mph cross-onshore wind, it'll be a washing machine – more of a kite-surfing setup than a surfers' paradise. We see some moderate swell again on the 12th (Saturday) with energy reading 272 and 342, but again, it's all cross-onshore.
Things get a little more interesting as we look into the second week. Monday the 14th of September shows some signs of life. We’ve got a clean-ish morning with a gentle cross-shore breeze from the northwest and a 6 ft swell rolling in from the SSW. The combined energy is a solid 258 (moderate). It's not perfect, still a bit of cross-chop in there, but it's the first real chance to get a few. It’s still a bit raw, but it's something.
Then, on Sunday the 20th of September, we might actually have a bit of a standout. The morning is looking promising with light airs and a cross-shore breeze from the southeast. Swell is a clean 6 ft from the southwest, and that combined energy is a strong 548. That’s proper energy in the water, and with light wind, it could set up really nicely for an exposed spot like this. The only thing is, it's far out, so you gotta take that promise with a pinch of salt for now. The following Monday the 21st drops right off again, so if that Sunday window holds, you’ll want to be on it.
So, the pick of the bunch? Honestly, you're best off waiting. The 20th of September morning is the one that's got my attention. That 6 ft SW groundswell with near-calm conditions could be magic for the high tide bank.
Rusty
Short Range ForecastModerate rain (total 12mm), heaviest on Mon night. Warm (max 20°C on Sun afternoon, min 12°C on Mon night). Winds increasing (light winds from the WSW on Sun night, strong winds from the SW by Mon night). | Days 4-6 Weather SummarySome drizzle, heaviest during Thu night. Very mild (max 17°C on Thu night, min 14°C on Wed morning). Winds decreasing (fresh winds from the WNW on Wed morning, calm by Fri afternoon). | ||||||||||||||||||||
Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | |||||||||||||||
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 5 | SSW 6 | SSW 6 | SW 14 | SW 5 | SW 7 | WSW 6 | W 6 | WNW 6 | NW 6 | SW 6 | SW 7 | SSW 5 | SW 6 | SW 6 | NW 4 | SW 6 | SW 6 | SSW 6 | SW 7 | SW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 97 | 156 | 123 | 33 | 49 | 434 | 309 | 232 | 290 | 228 | 13 | 8 | 105 | 69 | 65 | 28 | 18 | 9 | 272 | 342 | 73 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | on | cross-on | on | cross-on | cross-on | cross-on | cross | cross-on | on | cross-on | cross-on | on | cross-on | cross-on | cross | cross-on | cross-on | cross-on |
High Tide | 5:48PM3.13m | 6:46AM3.12m | 7:12PM3.41m | 7:58AM3.37m | 8:11PM3.77m | 8:48AM3.63m | 8:58PM4.11m | 9:29AM3.86m | 9:39PM4.37m | 10:06AM4.03m | 10:17PM4.51m | 10:42AM4.11m | 10:54PM4.52m | ||||||||
Low Tide | 12:11PM1.26m | 00:57AM0.99m | 1:29PM1.03m | 2:07AM0.62m | 2:30PM0.70m | 3:02AM0.22m | 3:19PM0.38m | 3:49AM-0.10m | 4:02PM0.12m | 4:31AM-0.30m | 4:43PM-0.03m | 5:10AM-0.34m | 5:22PM-0.06m | ||||||||
 |  |  | |  |  | | | | |  | | | |  | | | | | | | |
 | 6:35 | — | — | 6:35 | — | — | 6:37 | — | — | 6:39 | — | — | 6:41 | — | — | 6:43 | — | — | 6:45 | — | — |
 | — | 7:55 | — | — | 7:53 | — | — | 7:52 | — | — | 7:49 | — | — | 7:46 | — | — | 7:44 | — | — | 7:42 | — |
mm | 1 | — | — | — | — | 10 | — | 1 | — | — | — | — | — | — | 1 | — | — | — | 1 | — | — |
Temp °C | 18 | 20 | 17 | 15 | 16 | 15 | 14 | 15 | 14 | 14 | 15 | 16 | 16 | 16 | 17 | 15 | 16 | 16 | 17 | 18 | 15 |
Feels °C | 11 | 14 | 14 | 11 | 11 | 7 | 7 | 8 | 6 | 7 | 10 | 14 | 11 | 12 | 14 | 13 | 15 | 15 | 12 | 13 | 10 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 13 | SW 12 | SW 14 | SW 13 | — | — | — | — | SW 6 | NNW 6 | NNW 5 | — | — | — | SW 6 | NW 4 | SW 6 | — | — | SW 7 |
| kJ | 7 | 6 | 6 | 33 | 27 | — | — | — | — | 21 | 55 | 8 | — | — | — | 26 | 11 | 9 | — | — | 73 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | WNW 4 | — | — | — | — | — | SW 6 | SW 7 | — | — | — | — | SW 6 | NNW 4 | — | — | NW 4 |
| kJ | — | — | — | — | 1 | — | — | — | — | — | 11 | 8 | — | — | — | — | 18 | 2 | — | — | 19 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | SSW 3 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 5 | SSW 6 | SSW 6 | WSW 4 | SW 5 | SW 7 | WSW 6 | W 6 | WNW 6 | NW 6 | W 4 | WNW 3 | SSW 5 | SW 6 | SW 6 | NW 4 | NW 4 | — | SSW 6 | SW 7 | NW 4 |
| kJ | 97 | 156 | 123 | 23 | 49 | 434 | 309 | 232 | 290 | 228 | 13 | 2 | 105 | 69 | 65 | 28 | 4 | — | 272 | 342 | 21 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 231 | 341 | 212 | 44 | 319 | 283 | 506 | 541 | 541 | 272 | 297 | 256 | 262 | 287 | 299 | 44 | 150 | 179 | 261 | 256 | 44 |
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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