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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
16 Day Weather and Surf, issued 11 pm Wednesday 25 Mar 2026 GMTForecast update in hr min s Forecast update imminent
Cable Bay (Porth Trecastell) surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Cable Bay (Porth Trecastell) sea temperature is
9.1° C
(Which is 1.3°C warmer than normal for this time of year)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 2.2m 7s and forecast to arrive on Sunday (Mar 29) at 4PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Thursday (Mar 26) at 3AM.
| Wave Type | Time (GMT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Sun 29th Mar) | 7ft (2.2m) 7s |
Table - best surf conditions forecast for Cable Bay (Porth Trecastell) over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range Forecast Moderate rain (total 12mm), heaviest on Thu night. Mild temperatures (max 9°C on Thu night, min 5°C on Fri night). Mainly fresh winds. | Days 3-6 Weather Summary Light rain (total 2mm), mostly falling on Sun morning. Very mild (max 12°C on Mon night, min 7°C on Sat night). Winds decreasing (strong winds from the SW on Sun morning, light winds from the WSW by Tue afternoon). | |||||||||||||||||||||
Thursday 26 | Friday 27 | Saturday 28 | Sunday 29 | Monday 30 | Tuesday 31 | Wed 01 | ||||||||||||||||
| Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | ||
Rating (10 max) | ||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||
| Period(s) (?) | 7 | 4 | 3 | 5 | 6 | 6 | 5 | 6 | 6 | 4 | 5 | 7 | 7 | 5 | 4 | 4 | 4 | 4 | 4 | 6 | 5 | |
Wave (?)Graph  | ||||||||||||||||||||||
 kJ (?) | 391 | 9 | 4 | 53 | 69 | 35 | 84 | 282 | 1 | 7 | 106 | 411 | 132 | 39 | 28 | 32 | 16 | 9 | 11 | 23 | 4 | |
Wind (km/h) | ||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross | cross | on | on | on | cross | cross | cross | cross | cross- on | on | on | cross- on | cross- on | cross- on | cross- on | on | cross- on | cross- on | cross | cross- off | |
High Tide / height (m) | 2:07AM 3.26 | 3:07PM 3.00 | 3:46AM 3.11 | 5:08PM 2.95 | 5:30AM 3.24 | 6:35PM 3.14 | 6:41AM 3.52 | 7:27PM 3.38 | 7:29AM 3.81 | 8:04PM 3.61 | 8:08AM 4.04 | 8:36PM 3.80 | 8:43AM 4.19 | |||||||||
Low Tide / height (m) | 9:30AM 1.03 | 10:10PM 1.32 | 11:03AM 1.04 | 11:39PM 1.25 | 12:25PM 0.80 | 12:50AM 0.99 | 1:26PM 0.48 | 1:43AM 0.68 | 2:14PM 0.20 | 2:28AM 0.42 | 2:55PM 0.01 | 3:08AM 0.24 | 3:32PM -0.07 | |||||||||
Thursday 26 | Friday 27 | Saturday 28 | Sunday 29 | Monday 30 | Tuesday 31 | Wed 01 | ||||||||||||||||
| Sunrise | - | 6:07 | - | - | 6:05 | - | - | 6:01 | - | - | 6:00 | - | - | 5:56 | - | - | 5:54 | - | - | 5:52 | - | |
| Sunset | - | - | 6:40 | - | - | 6:43 | - | - | 6:44 | - | - | 6:45 | - | - | 6:47 | - | - | 6:50 | - | - | 6:52 | |
 |  |  |  |  |  |  | | | | | | | | |  | |  | | | | ||
Rain (mm) | 1 | - | - | 4 | 6 | 1 | - | - | - | - | 1 | 1 | - | - | - | - | - | - | - | - | - | |
| Temp. °C | 7 | 6 | 7 | 9 | 9 | 8 | 7 | 6 | 8 | 7 | 7 | 9 | 10 | 9 | 11 | 12 | 10 | 11 | 12 | 9 | 8 | |
| Feels °C (?) | -2 | 1 | 2 | 4 | 5 | 4 | 0 | -3 | 2 | 2 | -2 | 2 | 4 | 3 | 8 | 8 | 6 | 8 | 7 | 5 | 3 | |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
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 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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