Surf Forecasts:
Cable Bay (Porth Trecastell) surf forecast from 11 Oct 2026:
- Best quality surf: Monday 12 Oct, 7AM (local time) - 6ft (1.8m), 7s period, SSW swell with cross-offshore winds.
- Most powerful swell: Thursday 15 Oct, 4AM (local time) - 10ft (3.0m), 8s period, SSW swell with 1,236 kJ wave energy.
- Next surfable swell (1★+): Monday 12 Oct, 7AM (local time) - 6ft (1.8m), 7s period with SSW 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 Monday (Oct 12) at 7AM. The primary swell is predicted to be 1.8m and 7s period with a secondary swell of 0.1m and 13s. Another secondary swell of 0.1m and 14s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Cable Bay (Porth Trecastell) in the next 16 days are 3.0m 8s and forecast to arrive on Thursday (Oct 15) at 4AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Saturday (Oct 17) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Mon 12th Oct) | 6ft (1.8m) 7s |
| Best Surf | 7AM (Mon 12th Oct) | 6ft (1.8m) 7s |
| Most Powerful | 4AM (Thu 15th Oct) | 10ft (3.0m) 8s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
Short Range ForecastModerate rain (total 10mm), heaviest on Tue morning. Very mild (max 17°C on Mon night, min 11°C on Sat night). Winds increasing (calm on Sun morning, strong winds from the S by Mon night). | Days 5-7 Weather SummaryModerate rain (total 18mm), heaviest on Thu morning. Very mild (max 16°C on Wed night, min 11°C on Thu morning). Winds increasing (light winds from the SW on Tue night, strong winds from the SSW by Wed afternoon). | |||||||||||||||||||
Sat 10 | Sunday 11 | Monday 12 | Tuesday 13 | Wednesday 14 | Thursday 15 | Friday 16 | ||||||||||||||
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) | NW 6 | SW 5 | SW 6 | S 3 | S 6 | SSW 7 | SSW 5 | SSW 7 | SW 7 | SW 6 | SW 8 | SW 6 | SSW 7 | SSW 8 | SSW 8 | SW 7 | SW 7 | WNW 5 | WNW 5 | SW 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 209 | 10 | 5 | 4 | 127 | 261 | 95 | 459 | 277 | 184 | 119 | 222 | 709 | 1014 | 800 | 235 | 54 | 56 | 59 | 11 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | glassy | cross-on | cross | cross | cross-on | cross-on | on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross-off | off |
High Tide | 9:53PM4.31m | 10:14AM4.10m | 10:28PM4.28m | 10:46AM4.11m | 11:03PM4.16m | 11:19AM4.04m | 11:38PM3.96m | 11:52AM3.88m | 00:14AM3.70m | 12:27PM3.66m | 00:52AM3.39m | 1:06PM3.39m | 1:35AM3.06m | |||||||
Low Tide | 4:21PM0.08m | 4:44AM-0.11m | 4:59PM0.05m | 5:19AM0.01m | 5:34PM0.11m | 5:53AM0.22m | 6:09PM0.26m | 6:27AM0.48m | 6:45PM0.47m | 7:01AM0.77m | 7:22PM0.74m | 7:37AM1.06m | 8:04PM1.03m | |||||||
 |  |  | | |  | |  | | |  |  | | |  | | | | | | |
 | — | — | 7:35 | — | — | 7:37 | — | — | 7:39 | — | — | 7:41 | — | — | 7:43 | — | — | 7:45 | — | — |
 | 6:34 | — | — | 6:31 | — | — | 6:30 | — | — | 6:28 | — | — | 6:24 | — | — | 6:22 | — | — | 6:21 | — |
mm | 1 | — | — | — | — | 1 | — | 4 | 4 | — | — | — | — | — | 14 | 4 | — | — | — | — |
Temp °C | 13 | 12 | 12 | 13 | 14 | 16 | 16 | 17 | 15 | 15 | 14 | 14 | 15 | 16 | 15 | 13 | 12 | 11 | 12 | 12 |
Feels °C | 6 | 6 | 11 | 8 | 10 | 13 | 11 | 11 | 9 | 10 | 10 | 8 | 7 | 8 | 8 | 8 | 5 | 6 | 8 | 10 |
Swell 1 Height (m) Direction Period (s) | SW 6 | SW 5 | N 5 | NNW 4 | — | SW 13 | SW 12 | — | SW 7 | — | NW 4 | — | — | — | — | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 |
| kJ | 18 | 10 | 12 | 2 | — | 7 | 35 | — | 277 | — | 8 | — | — | — | — | 235 | 54 | 38 | 35 | 11 |
Swell 2 Height (m) Direction Period (s) | — | — | SW 6 | SSW 6 | — | — | — | — | — | — | — | — | — | — | — | WSW 14 | WSW 12 | SW 12 | SW 12 | SW 11 |
| kJ | — | — | 5 | 3 | — | — | — | — | — | — | — | — | — | — | — | 18 | 15 | 6 | 6 | 5 |
Swell 3 Height (m) Direction Period (s) | — | — | WNW 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NW 6 | NW 6 | — | S 3 | S 6 | SSW 7 | SSW 5 | SSW 7 | — | SW 6 | SW 8 | SW 6 | SSW 7 | SSW 8 | SSW 8 | — | WNW 4 | WNW 5 | WNW 5 | NW 5 |
| kJ | 209 | 101 | — | 4 | 127 | 261 | 95 | 459 | — | 184 | 119 | 222 | 709 | 1014 | 800 | — | 28 | 56 | 59 | 90 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 495 | 187 | 158 | 260 | 277 | 49 | 226 | 279 | 328 | 283 | 40 | 226 | 427 | 248 | 106 | 106 | 167 | 173 | 173 | 5 |
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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