- Forecast
- Maps
- Live
- Weather State
- Spot Information
Cable Bay (Porth Trecastell) Surf Forecast
/ Wales – Anglesy (10 surf breaks) /
Surf Forecasts:
Cable Bay (Porth Trecastell) surfForecast / Wales – Anglesy / UK
48hr Weather and Surf, issued 6 am Thursday 18 Sep 2025 BST
How big are the waves at Cable Bay (Porth Trecastell) today?
The current surf forecast for Cable Bay (Porth Trecastell) at 8AM is: 1.3m 7s primary swell from a South-southwest direction and 0.4m 4s secondary swell from a Northwest direction (forecast issued at 06:00am September 18). The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 Sep) | 4.5ft (1.3m) | 7s |
| Afternoon (18 Sep) | 7ft (2.1m) | 6s |
| Evening (18 Sep) | 8ft (2.5m) | 7s |
Table - waves today at Cable Bay (Porth Trecastell). (Swell directed towards the surf break)
Thursday 18 | Friday 19 | Saturday 20 | Sun 21 | |||||||||||||||||||||
| 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 7 | 7 | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 7 | 7 | 7 | 9 | 9 | 9 | 8 | 8 | 15 | 14 | 5 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 228 | 168 | 123 | 184 | 508 | 595 | 664 | 637 | 637 | 417 | 233 | 163 | 156 | 84 | 57 | 36 | 49 | 38 | 19 | 18 | 11 | 8 | 8 | 8 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | on | on | on | on | cross- on | cross- on | cross- on | on | on | on | on | cross | off | off | off | off | off | off | off | off | off | cross- off | cross- off |
High Tide / height (m) | 8:09AM 3.25 | 8:14PM 3.62 | 8:51AM 3.46 | 8:54PM 3.88 | 9:23AM 3.65 | 9:29PM 4.09 | ||||||||||||||||||
Low Tide / height (m) | 2:22PM 0.85 | 2:54AM 0.40 | 3:09PM 0.58 | 3:37AM 0.16 | 3:49PM 0.37 | |||||||||||||||||||
Thursday 18 | Friday 19 | Saturday 20 | Sun 21 | |||||||||||||||||||||
| Sunrise | - | 6:54 | - | - | - | - | - | - | - | 6:56 | - | - | - | - | - | - | - | 6:58 | - | - | - | - | - | - |
| Sunset | - | - | - | - | - | 7:27 | - | - | - | - | - | - | - | 7:24 | - | - | - | - | - | - | - | 7:22 | - | - |
 |  |  | | |  |  | |  | | | | | | | | | | | | |  |  | | |
Rain (mm) | - | - | 1 | 1 | 1 | - | - | - | 1 | 2 | 1 | 2 | 3 | 1 | - | 2 | 1 | 2 | 3 | 2 | 2 | 4 | 1 | 2 |
| Temp. °C | 14 | 14 | 15 | 16 | 16 | 17 | 17 | 16 | 16 | 16 | 16 | 16 | 14 | 13 | 13 | 13 | 13 | 13 | 12 | 13 | 14 | 15 | 14 | 14 |
| Feels °C (?) | 11 | 10 | 12 | 11 | 10 | 11 | 11 | 10 | 10 | 12 | 13 | 15 | 13 | 12 | 12 | 13 | 12 | 11 | 9 | 10 | 11 | 14 | 12 | 11 |
- Map Icons:
Break
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
Wind reports 4 km away suggest it is still onshore at Cable Bay (Porth Trecastell) (moderate winds from the SW at Valley RAF Airport). 1.2m 6s windswell from the SW with a 0.5m 6s windswell from the W. 2 swells combining to make bigger set waves.
1 h 31 min ago
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.
Nearest