Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 10 Nov 2026:
- Best quality surf: Wednesday 11 Nov, 12AM (local time) - 3.5ft (1.0m), 13s period, SW swell with offshore winds.
- Most powerful swell: Tuesday 17 Nov, 12AM (local time) - 6.5ft (2.0m), 12s period, WSW swell with 1,026 kJ wave energy.
- Next surfable swell (1★+): Tuesday 10 Nov, 3PM (local time) - 2.5ft (0.8m), 12s 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 Tuesday (Nov 10) at 3PM. The primary swell is predicted to be 0.8m and 12s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Cable Bay (Porth Trecastell) in the next 16 days are 2.0m 12s and forecast to arrive on Tuesday (Nov 17) at 12AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.3m 6s period and expected on Monday (Nov 16) at 6AM.
| Wave Type | Time (GMT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Tue 10th Nov) | 2.5ft (0.8m) 12s |
| Best Surf | 12AM (Wed 11th Nov) | 3.5ft (1.0m) 13s |
| Most Powerful | 12AM (Tue 17th Nov) | 6.5ft (2.0m) 12s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
Short Range ForecastMostly dry. Mild temperatures (max 9°C on Tue afternoon, min 6°C on Tue morning). Winds increasing (calm on Tue morning, fresh winds from the NNE by Thu morning). | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Sun night. Very mild (max 11°C on Sun night, min 6°C on Sat night). Winds increasing (calm on Fri morning, fresh winds from the SE by Sun night). | ||||||||||||||||||||
Tuesday 10 | Wednesday 11 | Thursday 12 | Friday 13 | Saturday 14 | Sunday 15 | Monday 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) | SW 11 | SW 12 | SW 13 | SW 12 | SW 12 | SW 11 | SSW 10 | SW 10 | SW 10 | SW 9 | SW 9 | SSW 12 | SW 11 | SW 10 | SSW 6 | S 7 | SW 11 | SSW 9 | NW 6 | WSW 6 | WSW 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 130 | 161 | 336 | 248 | 212 | 97 | 71 | 49 | 47 | 21 | 21 | 13 | 29 | 27 | 50 | 34 | 29 | 32 | 386 | 266 | 1026 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | off | off | off | cross-off | off | off | cross-off | off | on | cross-on | cross-on | cross-on | cross | cross | cross-on | cross-off | on | on | on |
High Tide | 9:21AM4.00m | 9:41PM3.88m | 9:55AM3.96m | 10:17PM3.75m | 10:30AM3.85m | 10:54PM3.57m | 11:07AM3.70m | 11:32PM3.34m | 11:46AM3.51m | 00:14AM3.09m | 12:31PM3.31m | 1:04AM2.87m | 1:27PM3.13m | 2:17AM2.71m | |||||||
Low Tide | 4:15PM0.27m | 4:29AM0.44m | 4:50PM0.36m | 5:04AM0.60m | 5:26PM0.51m | 5:39AM0.79m | 6:05PM0.70m | 6:16AM0.98m | 6:47PM0.91m | 6:57AM1.17m | 7:35PM1.10m | 7:44AM1.34m | 8:30PM1.24m | ||||||||
 | |  |  |  |  | | |  | | | | | | | | |  |  |  | | |
 | 7:31 | — | — | 7:33 | — | — | 7:35 | — | — | 7:37 | — | — | 7:39 | — | — | 7:41 | — | — | 7:43 | — | — |
 | — | 4:30 | — | — | 4:29 | — | — | 4:27 | — | — | 4:25 | — | — | 4:23 | — | — | 4:22 | — | — | 4:21 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 8 | 6 | 4 | 11 |
Temp °C | 8 | 9 | 8 | 9 | 9 | 8 | 8 | 8 | 7 | 8 | 8 | 8 | 7 | 7 | 7 | 8 | 8 | 11 | 12 | 12 | 12 |
Feels °C | 6 | 6 | 3 | 4 | 4 | 4 | 1 | 0 | 2 | 5 | 5 | 4 | 2 | 2 | 3 | 4 | 3 | 5 | 5 | 1 | 0 |
Swell 1 Height (m) Direction Period (s) | SW 11 | SW 12 | SW 13 | SW 12 | SW 12 | SW 11 | SSW 10 | SW 10 | SW 10 | SW 9 | SW 9 | SW 8 | SW 11 | SW 10 | SW 10 | SW 10 | SW 11 | SSW 5 | SSW 8 | SSW 9 | SW 12 |
| kJ | 130 | 161 | 336 | 248 | 212 | 97 | 71 | 49 | 47 | 21 | 21 | 11 | 29 | 27 | 16 | 24 | 29 | 20 | 34 | 161 | 469 |
Swell 2 Height (m) Direction Period (s) | — | ENE 5 | — | — | — | — | — | — | NNW 5 | NNW 4 | N 4 | SSW 12 | SSW 8 | — | SW 10 | — | — | SSW 9 | SSW 8 | N 6 | — |
| kJ | — | 2 | — | — | — | — | — | — | 5 | 6 | 3 | 13 | 7 | — | 26 | — | — | 32 | 58 | 27 | — |
Swell 3 Height (m) Direction Period (s) | — | SSE 4 | — | — | — | — | — | — | — | — | S 13 | — | SW 13 | — | — | — | — | — | — | — | — |
| kJ | — | 2 | — | — | — | — | — | — | — | — | 4 | — | 7 | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | ENE 4 | — | ENE 5 | NE 4 | NE 3 | N 3 | N 5 | N 5 | N 5 | NE 4 | — | — | SSW 4 | SSW 4 | SSW 6 | S 7 | S 4 | ENE 4 | NW 6 | WSW 6 | WSW 12 |
| kJ | 2 | — | 15 | 10 | 3 | 3 | 74 | 70 | 37 | 5 | — | — | 10 | 14 | 50 | 34 | 20 | 28 | 386 | 266 | 1026 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 0 | 0 | 0 | 172 | 172 | 48 | 150 | 158 | 150 | 150 | 150 | 157 | 2 | 179 | 283 | 285 | 283 | 306 |
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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