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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 12 pm Wednesday 08 Apr 2026 BSTForecast 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
9.2° C
(Which is 1.1°C warmer than normal for this time of year)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 (Apr 13) at 10PM. The primary swell is predicted to be 1.3m and 9s period with a secondary swell of 0.7m and 4s. 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 3.5m 9s and forecast to arrive on Saturday (Apr 11) at 4PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 5s period and expected on Tuesday (Apr 14) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Mon 13th Apr) | 4.5ft (1.3m) 9s |
| Best Surf | 10PM (Mon 13th Apr) | 4.5ft (1.3m) 9s |
| Most Powerful | 4PM (Sat 11th Apr) | 11ft (3.5m) 9s |
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 Light rain (total 6mm), mostly falling on Fri night. Very mild (max 13°C on Wed morning, min 5°C on Fri night). Winds increasing (light winds from the SW on Thu night, near gales from the S by Fri night). | Days 3-6 Weather Summary Moderate rain (total 19mm), heaviest on Mon afternoon. Mild temperatures (max 9°C on Sat night, min 6°C on Mon night). Winds decreasing (near gales from the SSW on Sat night, calm by Mon night). | ||||||||||||||||||||
Wednesday 08 | Thursday 09 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | |||||||||||||||
| 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) (?) | 6 | 8 | 8 | 6 | 5 | 6 | 6 | 6 | 8 | 8 | 9 | 8 | 7 | 8 | 6 | 7 | 9 | 9 | 9 | 9 | 8 |
Wave (?)Graph  | |||||||||||||||||||||
 kJ (?) | 15 | 18 | 15 | 108 | 78 | 101 | 19 | 161 | 1595 | 1048 | 2080 | 1027 | 131 | 173 | 171 | 912 | 664 | 207 | 115 | 81 | 46 |
Wind (km/h) | |||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | on | cross- on | on | on | cross | on | cross- on | on | cross- off | cross- off | cross- off | off |
High Tide / height (m) | 1:47PM 3.06 | 2:04AM 3.06 | 2:42PM 2.77 | 3:15AM 2.84 | 4:27PM 2.59 | 5:12AM 2.80 | 6:18PM 2.67 | ||||||||||||||
Low Tide / height (m) | 8:31PM 1.34 | 9:06AM 1.34 | 9:26PM 1.56 | 10:17AM 1.53 | 10:45PM 1.66 | 11:50AM 1.51 | 12:15AM 1.58 | ||||||||||||||
Wednesday 08 | Thursday 09 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | |||||||||||||||
| Sunrise | 6:35 | - | - | 6:33 | - | - | 6:31 | - | - | 6:28 | - | - | 6:26 | - | - | 6:24 | - | - | 6:22 | - | - |
| Sunset | - | 8:04 | - | - | 8:06 | - | - | 8:07 | - | - | 8:09 | - | - | 8:10 | - | - | 8:13 | - | - | 8:15 | - |
 |  |  |  | | |  | |  | |  | | | | | |  | | | |  | |
Rain (mm) | - | - | - | 1 | - | - | - | - | 5 | - | 1 | 6 | 2 | 1 | - | 1 | 6 | 2 | - | - | - |
| Temp. °C | 13 | 13 | 12 | 10 | 8 | 7 | 7 | 6 | 8 | 8 | 8 | 9 | 8 | 9 | 9 | 8 | 7 | 7 | 8 | 9 | 9 |
| Feels °C (?) | 12 | 12 | 9 | 4 | 0 | -1 | -1 | -3 | -4 | -3 | -3 | -3 | -1 | 2 | 4 | 0 | 1 | 5 | 0 | 3 | 6 |
- 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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