Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 10 Sep 2026:
- Most powerful swell: Thursday 10 Sep, 4PM (local time) - 7ft (2.2m), 7s period, SSW swell with 437 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 2.2m 7s and forecast to arrive on Thursday (Sep 10) at 4PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 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 | 4PM (Thu 10th Sep) | 7ft (2.2m) 7s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
The Lowdown
We've got a stretch of dud conditions from now until the 24th of September. Onshore winds and short-period SW slop will keep things closed out and bumpy. There's some size on the 24th afternoon, around 7ft, but it's a messy cross-onshore, so don't get too excited.
The light at the end of the tunnel is Friday, September 25th at Cable Bay (Porth Trecastell). The morning is shaping up to be the standout. A clean 7ft SW groundswell with light offshore winds from the E is the full package. The water's about 63°F, a touch warmer than normal. This is the day to clear your schedule. The energy is strong, and the conditions will be glassy. The afternoon wind switches onshore, and the swell drops a bit, but the morning session is going to be special. Crowds are possible, especially with conditions like that, so get out early. This is your window.
Everything else is a washout. Don't waste your time. This is the one.
Rusty
Short Range ForecastLight rain (total 6mm), mostly falling on Thu afternoon. Very mild (max 18°C on Thu night, min 13°C on Fri afternoon). Winds decreasing (strong winds from the SSW on Thu morning, light winds from the SW by Sat night). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Mon night. Very mild (max 18°C on Mon afternoon, min 13°C on Tue night). Winds increasing (calm on Sun afternoon, strong winds from the SSW by Mon night). | ||||||||||||||||||||
Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | |||||||||||||||
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 6 | SSW 7 | SW 7 | SW 7 | SW 6 | SW 5 | SW 7 | SW 7 | SW 6 | SSW 6 | SW 6 | SSW 6 | SSW 4 | SSW 5 | SSW 6 | SW 6 | WNW 4 | SW 6 | SSW 7 | SW 6 | SW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 173 | 437 | 106 | 44 | 20 | 67 | 363 | 332 | 97 | 26 | 9 | 13 | 31 | 77 | 184 | 68 | 25 | 5 | 5 | 2 | 1 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross | cross-on | cross-on | on | on | on | off | cross-off | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-off | cross-off | cross-off | cross |
High Tide | 9:39PM4.37m | 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 | ||||||||
Low Tide | 4:02PM0.12m | 4:31AM-0.30m | 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 | ||||||||
 |  |  |  | | |  | | | | |  | | | |  | | | | | | |
 | 6:41 | — | — | 6:43 | — | — | 6:45 | — | — | 6:47 | — | — | 6:48 | — | — | 6:50 | — | — | 6:52 | — | — |
 | — | 7:46 | — | — | 7:44 | — | — | 7:42 | — | — | 7:38 | — | — | 7:37 | — | — | 7:35 | — | — | 7:31 | — |
mm | — | 2 | 1 | — | — | 1 | 1 | — | 1 | — | — | — | — | — | 2 | — | — | — | — | — | — |
Temp °C | 16 | 17 | 18 | 14 | 14 | 16 | 17 | 17 | 18 | 16 | 16 | 16 | 17 | 18 | 18 | 16 | 16 | 14 | 13 | 14 | 14 |
Feels °C | 8 | 13 | 15 | 11 | 12 | 10 | 13 | 14 | 19 | 15 | 15 | 14 | 14 | 14 | 14 | 12 | 14 | 12 | 8 | 10 | 12 |
Swell 1 Height (m) Direction Period (s) | — | — | SW 7 | SW 7 | SW 6 | — | — | — | SW 6 | SSW 6 | NNW 5 | N 4 | — | SW 12 | — | SW 6 | SW 6 | SW 6 | SSW 7 | SW 6 | SW 6 |
| kJ | — | — | 106 | 44 | 20 | — | — | — | 97 | 26 | 7 | 1 | — | 6 | — | 68 | 16 | 5 | 5 | 2 | 1 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | N 4 | — | — | — | — | — | SW 6 | — | — | — | — | — | — | S 11 | SW 11 | — | SW 6 |
| kJ | — | — | — | — | 3 | — | — | — | — | — | 9 | — | — | — | — | — | — | 2 | 5 | — | 1 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | WNW 3 | — | — | — | — | — | — | — | — | S 6 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | 1 | — |
Wind waves Height (m) Direction Period (s) | SSW 6 | SSW 7 | W 4 | NW 4 | WNW 4 | SW 5 | SW 7 | SW 7 | WNW 4 | NNW 5 | — | SSW 6 | SSW 4 | SSW 5 | SSW 6 | WNW 4 | WNW 4 | NW 5 | NNW 6 | NNW 5 | NNW 5 |
| kJ | 173 | 437 | 7 | 17 | 6 | 67 | 363 | 332 | 15 | 19 | — | 13 | 31 | 77 | 184 | 19 | 25 | 56 | 119 | 78 | 45 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 302 | 471 | 248 | 172 | 44 | 293 | 313 | 96 | 96 | 45 | 173 | 256 | 179 | 261 | 198 | 44 | 1145 | 173 | 217 | 185 | 185 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Cable Bay (Porth Trecastell) surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest