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Cable Bay (Porth Trecastell) Surf Forecast
/ Wales – Anglesy (10 surf breaks) /
Surf Forecasts:
Cable Bay (Porth Trecastell) surfForecast / Wales – Anglesy / UK
12 Day Weather and Surf, issued 12 pm Monday 15 Sep 2025 BST
Best Forecast Surf Conditions for Cable Bay (Porth Trecastell) this week:
The surf forecast for Cable Bay (Porth Trecastell) over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Sep 19) at 1PM. The primary swell is predicted to be 1.2m and 7s period with a secondary swell of 0.5m and 8s. 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 12 days are 3.5m 10s and forecast to arrive on Sunday (Sep 21) at 1AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 7s period and expected on Sunday (Sep 21) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1PM (Fri 19th Sep) | 4ft (1.2m) 7s |
| Best Surf | 7AM (Sun 21st Sep) | 6ft (1.8m) 8s |
| Most Powerful | 1AM (Sun 21st Sep) | 11ft (3.5m) 10s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 12 days.
Short Range Forecast Heavy rain (total 32mm), heaviest during Tue night. Very mild (max 17°C on Wed morning, min 12°C on Mon night). Winds decreasing (near gales from the WSW on Mon morning, light winds from the SW by Tue afternoon). | Days 3-6 Weather Summary Heavy rain (total 46mm), heaviest during Sat night. Very mild (max 17°C on Thu morning, min 12°C on Sat night). Winds decreasing (strong winds from the SSW on Thu morning, calm by Fri afternoon). | ||||||||||||||||||||
Monday 15 | Tuesday 16 | Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | |||||||||||||||
| AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Rating (10 max) | |||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | |||||||||||||||||||||
| Period(s) (?) | 8 | 7 | 7 | 6 | 5 | 5 | 8 | 8 | 7 | 7 | 8 | 7 | 7 | 7 | 7 | 6 | 7 | 10 | 8 | 5 | 7 |
Wave (?)Graph  | |||||||||||||||||||||
| Energy (?) | 2106 | 1131 | 711 | 264 | 107 | 86 | 913 | 735 | 253 | 603 | 883 | 595 | 170 | 81 | 38 | 181 | 302 | 2196 | 150 | 63 | 19 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | cross- on | cross- on | cross- on | on | on | on | cross- on | cross- on | cross- on | on | cross- on | cross- off | cross- off | on | on | cross- on | cross | cross- off | cross- off |
High Tide / height (m) | 4:01PM 3.11 | 5:15AM 2.95 | 5:51PM 3.10 | 7:04AM 3.04 | 7:18PM 3.33 | 8:09AM 3.25 | 8:14PM 3.62 | 8:51AM 3.46 | 8:54PM 3.88 | 9:23AM 3.65 | 9:29PM 4.09 | 9:53AM 3.81 | 10:01PM 4.22 | ||||||||
Low Tide / height (m) | 10:32AM 1.24 | 11:20PM 1.09 | 12:02PM 1.31 | 12:51AM 0.98 | 1:23PM 1.13 | 2:02AM 0.70 | 2:22PM 0.85 | 2:54AM 0.40 | 3:09PM 0.58 | 3:37AM 0.16 | 3:49PM 0.37 | 4:15AM 0.02 | 4:25PM 0.23 | ||||||||
Monday 15 | Tuesday 16 | Wednesday 17 | Thursday 18 | Friday 19 | Saturday 20 | Sunday 21 | |||||||||||||||
| Sunrise | 6:50 | - | - | 6:52 | - | - | 6:54 | - | - | 6:54 | - | - | 6:56 | - | - | 6:58 | - | - | 7:01 | - | - |
| Sunset | - | 7:35 | - | - | 7:31 | - | - | 7:30 | - | - | 7:27 | - | - | 7:24 | - | - | 7:22 | - | - | 7:20 | - |
 |  |  |  | |  | | |  | |  |  | | | |  | | | | | | |
Rain (mm) | 3 | 1 | - | - | - | 25 | 2 | - | 1 | - | - | 5 | 4 | 5 | 11 | 7 | - | 14 | 4 | 1 | 5 |
| Temp. °C | 14 | 15 | 14 | 14 | 16 | 15 | 17 | 16 | 16 | 17 | 17 | 17 | 15 | 13 | 17 | 16 | 15 | 14 | 13 | 12 | 11 |
| Feels °C (?) | 3 | 6 | 5 | 8 | 12 | 10 | 11 | 10 | 13 | 10 | 11 | 11 | 14 | 13 | 13 | 12 | 9 | 8 | 9 | 6 | 5 |
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Wales - Anglesy
The wind is still cross-on at Cable Bay (Porth Trecastell) (near gales from the WSW at Valley RAF Airport 4 km from Cable Bay (Porth Trecastell)). A 2.9m swell from the WSW
1 h 42 min ago
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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 12 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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