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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 12 am Monday 11 May 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
11.3° C
(Which is 1.1°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 4AM is: 0.1m 10s primary swell from a South direction (forecast issued at 12:00am May 11). An open ocean swell of 0.8m 4s is not directed at the surf break. The wind direction is predicted to be cross-shore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (11 May) | 0.5ft (0.1m) | 9s |
| Afternoon (11 May) | 0.5ft (0.1m) | 9s |
| Evening (11 May) | 0.5ft (0.1m) | 8s |
Table - waves today at Cable Bay (Porth Trecastell). (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 6mm), mostly falling on Mon morning. Very mild (max 12°C on Tue afternoon, min 8°C on Mon afternoon). Winds increasing (calm on Mon night, strong winds from the WNW by Tue night). | ||||||||||||||||||||||||
Monday 11 | Tuesday 12 | Wednesday 13 | ||||||||||||||||||||||
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 | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | |
Swell Height Map |    |    |    | |||||||||||||||||||||
NNW 3 | S 10 | SW 9 | SW 9 | W 4 | W 4 | SW 8 | SW 8 | SW 8 | SSW 8 | NW 4 | NW 4 | SSW 8 | SSW 8 | S 18 | WNW 4 | WNW 5 | WNW 6 | WNW 6 | NW 6 | NW 6 | NW 6 | SW 7 | SW 7 | |
0 | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 7 | 16 | 44 | 7 | 7 | 7 | 28 | 108 | 230 | 363 | 396 | 236 | 160 | 18 | 10 | |
Wind (km/h) | ||||||||||||||||||||||||
cross | cross | cross | cross-off | off | cross-off | cross-off | glassy | cross-on | cross-on | cross-on | cross | cross | cross-on | on | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross-off | cross-off | |
High Tide | 5:18AM3.10m | 6:13PM2.91m | 6:16AM3.28m | 7:00PM3.17m | 7:03AM3.52m | 7:41PM3.46m | ||||||||||||||||||
Low Tide | 11:13PM1.47m | 12:04PM1.15m | 00:22AM1.35m | 1:04PM0.90m | 1:22AM1.11m | 1:55PM0.61m | ||||||||||||||||||
 |  |  |  |  | | | | | | | | | | |  | |  |  | | | | | | |
 | — | 5:26 | — | — | — | — | — | — | — | 5:24 | — | — | — | — | — | — | — | 5:22 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 9:02 | — | — | — | — | — | — | — | 9:05 | — | — | — | — | — | — | — | 9:06 | — |
— | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 1 | 1 | 1 | — | — | |
Temp °C | 9 | 9 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 9 | 8 | 10 | 10 | 12 | 12 | 11 | 9 | 9 | 8 | 9 | 10 | 10 | 10 | 9 |
5 | 4 | 3 | 3 | 3 | 3 | 4 | 6 | 4 | 5 | 3 | 4 | 4 | 7 | 7 | 3 | 1 | 0 | -1 | 0 | 2 | 3 | 3 | 0 | |
Swell 1 Height (m) Direction Period (s) | — | S 10 | SW 9 | SW 9 | W 4 | W 4 | SW 8 | N 4 | NNW 4 | N 5 | SSW 9 | SSW 9 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SW 6 | SW 6 | SW 7 | SW 7 |
 kJ | — | 2 | 3 | 3 | 3 | 1 | 3 | 6 | 3 | 4 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 13 | 14 | 18 | 7 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | SW 9 | SW 8 | — | SW 8 | SW 8 | SSW 8 | — | — | — | — | S 18 | SW 18 | SW 18 | SW 18 | SW 17 | SW 17 | SSW 8 | SSW 8 | SW 16 | SW 8 |
| kJ | — | — | — | — | 3 | 3 | — | 3 | 3 | 7 | — | — | — | — | 6 | 12 | 12 | 12 | 12 | 11 | 6 | 6 | 10 | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | NE 4 | — | — | — | — | — | S 18 | — | — | — | — | — | SW 16 | SW 16 | — | SW 16 |
| kJ | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | 6 | — | — | — | — | — | 10 | 10 | — | 10 |
Wind waves Height (m) Direction Period (s) | NNW 3 | NNW 4 | NNW 5 | NNW 6 | N 6 | N 5 | N 5 | — | — | WNW 2 | NW 4 | NW 4 | NW 5 | NW 5 | NW 5 | WNW 4 | WNW 5 | WNW 6 | WNW 6 | NW 6 | NW 6 | NW 6 | NW 6 | NNW 6 |
| kJ | 4 | 18 | 59 | 130 | 62 | 33 | 16 | — | — | 1 | 16 | 44 | 71 | 51 | 38 | 28 | 108 | 230 | 363 | 396 | 236 | 160 | 118 | 280 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 242 | 270 | 317 | 258 | 75 | 284 | 284 | 157 | 221 | 212 | 221 | 294 | 413 | 282 | 286 | 282 | 284 | 292 | 592 | 604 | 928 | 1143 | 869 | 328 |
Best forecast wave conditions in Anglesy | ||||||||||||||||||||||||
Best forecast wave conditions in United Kingdom | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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Live Wind Speed (km/h)
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Ocean Swells (m)- Wind Speed (km/h)
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