Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 21 Sep 2026:
- Most powerful swell: Sunday 27 Sep, 4AM (local time) - 7ft (2.1m), 7s period, SW swell with 374 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 Sunday (Sep 27) at 4AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Wednesday (Sep 23) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4AM (Sun 27th Sep) | 7ft (2.1m) 7s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
Short Range ForecastLight rain (total 2mm), mostly falling on Tue night. Very mild (max 19°C on Tue night, min 12°C on Wed night). Winds increasing (light winds from the ENE on Wed night, fresh winds from the S by Thu morning). | Days 5-7 Weather SummaryLight rain (total 8mm), mostly falling on Thu night. Very mild (max 15°C on Thu afternoon, min 10°C on Fri night). Winds increasing (calm on Fri afternoon, strong winds from the SSW by Sun morning). | |||||||||||||||||||
Mon 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | Friday 25 | Saturday 26 | Sunday 27 | ||||||||||||||
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 4 | SSW 4 | SSW 4 | SSW 3 | SW 4 | SW 15 | SW 12 | N 4 | S 4 | SSW 5 | SSW 5 | SW 4 | SSW 4 | SW 12 | SW 3 | SW 4 | SW 6 | SW 6 | SSW 6 | SSW 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 7 | 11 | 5 | 6 | 12 | 8 | 6 | 0 | 19 | 90 | 37 | 9 | 2 | 6 | 2 | 36 | 352 | 223 | 319 | 134 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross-off | cross-off | cross-off | cross-on | cross-on | cross-on | cross-off | glassy | glassy | cross-on | on | on | cross-on | on | on |
High Tide | 7:09PM3.00m | 7:45AM2.94m | 7:57PM3.28m | 8:24AM3.18m | 8:32PM3.56m | 8:55AM3.43m | 9:01PM3.83m | 9:23AM3.66m | 9:29PM4.06m | 9:50AM3.87m | 9:58PM4.25m | 10:18AM4.03m | 10:29PM4.36m | |||||||
Low Tide | 1:44AM1.28m | 1:57PM1.28m | 2:29AM0.97m | 2:38PM0.99m | 3:05AM0.65m | 3:14PM0.70m | 3:39AM0.35m | 3:48PM0.45m | 4:12AM0.11m | 4:23PM0.24m | 4:46AM-0.05m | 4:58PM0.11m | ||||||||
 |  |  | |  | |  | | | |  |  | | | | | | |  | | |
 | — | — | 7:01 | — | — | 7:03 | — | — | 7:05 | — | — | 7:07 | — | — | 7:09 | — | — | 7:11 | — | — |
 | 7:20 | — | — | 7:17 | — | — | 7:15 | — | — | 7:13 | — | — | 7:09 | — | — | 7:07 | — | — | 7:05 | — |
mm | — | — | — | — | 2 | — | — | — | — | — | 1 | 2 | — | 2 | — | — | 1 | 2 | 2 | 7 |
Temp °C | 17 | 17 | 17 | 18 | 19 | 13 | 13 | 13 | 14 | 15 | 15 | 12 | 12 | 12 | 13 | 14 | 15 | 15 | 15 | 16 |
Feels °C | 16 | 16 | 16 | 17 | 16 | 9 | 9 | 11 | 8 | 10 | 11 | 10 | 12 | 10 | 10 | 9 | 10 | 8 | 9 | 10 |
Swell 1 Height (m) Direction Period (s) | S 13 | — | — | S 12 | SW 17 | SW 4 | SW 12 | N 4 | — | — | — | SW 4 | SSW 4 | SW 9 | — | SW 14 | — | — | — | SW 13 |
| kJ | 3 | — | — | 3 | 12 | 1 | 6 | 6 | — | — | — | 9 | 2 | 3 | — | 8 | — | — | — | 7 |
Swell 2 Height (m) Direction Period (s) | S 13 | — | — | W 6 | SW 12 | SW 15 | S 12 | — | — | — | — | NW 3 | — | — | — | — | — | — | — | — |
| kJ | 3 | — | — | 1 | 6 | 8 | 3 | — | — | — | — | 3 | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | SW 12 | — | — | — | — | — | — | — | SW 12 | — | — | — | — | — | — |
| kJ | — | — | — | — | — | 6 | — | — | — | — | — | — | — | 6 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 4 | SSW 4 | SSW 4 | SSW 3 | SW 4 | NNW 5 | NNW 5 | — | S 4 | SSW 5 | SSW 5 | NW 3 | — | SW 4 | SW 3 | SW 4 | SW 6 | SW 6 | SSW 6 | SSW 7 |
| kJ | 7 | 11 | 5 | 6 | 6 | 32 | 33 | — | 19 | 90 | 37 | 4 | — | 1 | 2 | 36 | 352 | 223 | 319 | 134 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 256 | 256 | 178 | 185 | 173 | 185 | 185 | 158 | 179 | 246 | 269 | 173 | 173 | 172 | 172 | 173 | 105 | 256 | 256 | 248 |
Best forecast wave conditions in Anglesy | ||||||||||||||||||||
Best forecast wave conditions in United Kingdom | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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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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