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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
48hr Weather and Surf, issued 5 am Saturday 21 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
8.9° C
(Which is 1.2°C warmer than normal for this time of year)How big are the waves at Cable Bay (Porth Trecastell) today?
The current surf forecast for Cable Bay (Porth Trecastell) at 10AM is: 0.2m 10s primary swell from a South-southwest direction and 0.1m 14s secondary swell from a Southwest direction (forecast issued at 05:00am March 21). The wind direction is predicted to be glassy.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Mar) | 0.5ft (0.2m) | 10s |
| Afternoon (21 Mar) | 0.5ft (0.2m) | 9s |
| Evening (21 Mar) | 0.5ft (0.2m) | 9s |
Table - waves today at Cable Bay (Porth Trecastell). (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Saturday 21 | Sunday 22 | Monday 23 | Tue 24 | |||||||||||||||||||||
| 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 14 | 14 | 10 | 9 | 9 | 9 | 9 | 8 | 9 | 9 | 9 | 10 | 12 | 9 | 9 | 11 | 10 | 10 | 10 | 9 | 9 | 4 | 4 | 5 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 4 | 8 | 10 | 9 | 8 | 8 | 7 | 7 | 7 | 8 | 7 | 4 | 6 | 8 | 8 | 12 | 10 | 10 | 24 | 23 | 21 | 14 | 44 | 110 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | glass | glass | glass | cross | cross- on | glass | cross- on | cross- on | cross- on | on | glass | glass | cross- on | cross- off | off | off | off | cross- off | cross- on | cross- on | on | cross- on | cross- on | on |
High Tide / height (m) | 10:26AM 4.51 | 10:47PM 4.20 | 11:05AM 4.37 | 11:26PM 4.08 | 11:48AM 4.11 | |||||||||||||||||||
Low Tide / height (m) | 5:24PM -0.15 | 5:39AM 0.04 | 6:05PM 0.08 | 6:23AM 0.22 | 6:49PM 0.41 | |||||||||||||||||||
Saturday 21 | Sunday 22 | Monday 23 | Tue 24 | |||||||||||||||||||||
| Sunrise | - | - | 6:18 | - | - | - | - | - | - | - | 6:16 | - | - | - | - | - | - | - | 6:13 | - | - | - | - | - |
| Sunset | - | - | - | - | - | 6:31 | - | - | - | - | - | - | - | 6:34 | - | - | - | - | - | - | - | 6:35 | - | - |
 | |  | | | | | | |  |  | | |  |  | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 10 | 10 | 9 | 11 | 11 | 10 | 10 | 9 | 9 | 8 | 8 | 8 | 9 | 9 | 8 | 7 | 6 | 6 | 6 | 7 | 7 | 8 | 8 | 9 |
| Feels °C (?) | 8 | 8 | 7 | 9 | 8 | 9 | 7 | 5 | 6 | 5 | 6 | 6 | 6 | 5 | 4 | 3 | 3 | 3 | 3 | 2 | 0 | 1 | 1 | 1 |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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