Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 14 Nov 2026:
- Best quality surf: Wednesday 18 Nov, 9PM (local time) - 8ft (2.4m), 16s period, SW swell with glassy winds.
- Most powerful swell: Wednesday 18 Nov, 9PM (local time) - 8ft (2.4m), 16s period, SW swell with 2,938 kJ wave energy.
- Next surfable swell (1★+): Wednesday 18 Nov, 9PM (local time) - 8ft (2.4m), 16s period with SW 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 Wednesday (Nov 18) at 9PM. The primary swell is predicted to be 2.4m and 16s period with a secondary swell of 1.8m and 10s. Another secondary swell of 0.9m and 16s is also forecast. 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 2.4m 16s and forecast to arrive on Wednesday (Nov 18) at 9PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 7s period and expected on Sunday (Nov 15) at 9PM.
| Wave Type | Time (GMT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Wed 18th Nov) | 8ft (2.4m) 16s |
| Best Surf | 9PM (Wed 18th Nov) | 8ft (2.4m) 16s |
| Most Powerful | 9PM (Wed 18th Nov) | 8ft (2.4m) 16s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
Short Range ForecastHeavy rain (total 21mm), heaviest during Mon night. Very mild (max 12°C on Mon night, min 5°C on Mon night). Winds decreasing (strong winds from the NNW on Sun afternoon, light winds from the WNW by Mon morning). | Days 5-7 Weather SummaryHeavy rain (total 22mm), heaviest during Wed morning. Very mild (max 11°C on Wed morning, min 7°C on Fri morning). Wind will be generally light. | |||||||||||||||||||
Sat 14 | Sunday 15 | Monday 16 | Tuesday 17 | Wednesday 18 | Thursday 19 | Friday 20 | ||||||||||||||
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 | SSW 7 | SSW 7 | SW 7 | SW 9 | SSW 9 | SSE 6 | SW 6 | SW 9 | SW 11 | SW 10 | SW 10 | SW 16 | SW 14 | SSW 10 | SW 10 | SW 15 | SSW 10 | SW 10 |
Wave Graph  | ||||||||||||||||||||
 kJ | 272 | 473 | 237 | 111 | 27 | 70 | 54 | 239 | 366 | 790 | 726 | 652 | 580 | 1869 | 382 | 296 | 211 | 227 | 185 | 139 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-off | cross-off | cross | cross-on | cross-off | on | on | cross-on | on | on | glassy | on | cross-off | cross-off | cross-off | cross | on |
High Tide | 00:14AM3.09m | 12:31PM3.31m | 1:04AM2.87m | 1:27PM3.13m | 2:17AM2.71m | 2:41PM3.03m | 3:50AM2.70m | 3:59PM3.05m | 4:59AM2.84m | 4:59PM3.17m | 5:47AM3.06m | 5:48PM3.36m | ||||||||
Low Tide | 6:47PM0.91m | 6:57AM1.17m | 7:35PM1.10m | 7:44AM1.34m | 8:30PM1.24m | 8:40AM1.47m | 9:33PM1.29m | 9:46AM1.51m | 10:39PM1.22m | 10:57AM1.44m | 11:40PM1.04m | 12:00PM1.25m | 00:33AM0.80m | |||||||
 |  |  | | |  | |  |  |  |  | | |  | | | | | | | |
 | — | — | 7:41 | — | — | 7:43 | — | — | 7:45 | — | — | 7:47 | — | — | 7:48 | — | — | 7:50 | — | — |
 | 4:23 | — | — | 4:22 | — | — | 4:21 | — | — | 4:20 | — | — | 4:17 | — | — | 4:16 | — | — | 4:15 | — |
mm | — | — | 4 | 1 | — | — | — | 14 | 2 | 1 | 3 | 4 | 3 | 4 | 3 | — | 3 | 1 | 10 | 11 |
Temp °C | 11 | 10 | 10 | 10 | 7 | 7 | 7 | 12 | 11 | 10 | 10 | 11 | 11 | 11 | 11 | 10 | 8 | 8 | 9 | 12 |
Feels °C | 2 | 1 | 6 | 1 | -3 | 1 | 3 | 3 | 2 | 4 | 4 | 7 | 6 | 10 | 9 | 6 | 4 | 4 | 5 | 5 |
Swell 1 Height (m) Direction Period (s) | — | WSW 11 | SW 7 | SSW 7 | SW 7 | SW 9 | SSW 9 | WSW 8 | NE 5 | — | SW 11 | SW 10 | SW 16 | SW 10 | SW 9 | SSW 10 | SW 10 | SSW 10 | SSW 10 | SW 10 |
| kJ | — | 12 | 139 | 111 | 27 | 70 | 54 | 7 | 1 | — | 726 | 652 | 437 | 546 | 353 | 296 | 211 | 161 | 185 | 139 |
Swell 2 Height (m) Direction Period (s) | — | — | W 11 | — | SW 12 | W 4 | NW 4 | — | E 6 | — | — | SW 16 | — | SW 16 | SW 14 | NE 6 | NNE 6 | SW 15 | SW 14 | NNE 5 |
| kJ | — | — | 2 | — | 6 | 9 | 8 | — | 1 | — | — | 169 | — | 492 | 382 | 37 | 3 | 227 | 103 | 8 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | SW 14 | — | — | NE 5 | SW 13 | — | SE 5 | SE 5 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 49 | — | — | 7 | 163 | — | 1 | 1 | — |
Wind waves Height (m) Direction Period (s) | SSW 6 | SSW 7 | SSW 7 | NNW 4 | NNW 7 | NNW 5 | — | SSE 6 | SW 6 | SW 9 | WNW 4 | — | SW 10 | SW 16 | — | — | ENE 6 | ENE 5 | NE 5 | — |
| kJ | 272 | 473 | 237 | 52 | 545 | 32 | — | 239 | 366 | 790 | 6 | — | 580 | 1869 | — | — | 55 | 61 | 43 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 296 | 262 | 49 | 187 | 212 | 173 | 166 | 511 | 287 | 261 | 243 | 96 | 106 | 0 | 10 | 5 | 0 | 5 | 49 | 296 |
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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