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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 pm Tuesday 12 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 4PM is: 0.2m 8s primary swell from a South-southwest direction (forecast issued at 12:00pm May 12). An open ocean swell of 0.9m 5s is not directed at the surf break. The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (12 May) | 3ft (0.9m) | 4s |
| Afternoon (12 May) | 3.5ft (1.0m) | 5s |
| Evening (12 May) | 3.5ft (1.0m) | 4s |
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 8mm), mostly falling on Tue night. Very mild (max 12°C on Tue afternoon, min 8°C on Tue night). Winds decreasing (strong winds from the WNW on Tue night, light winds from the N by Thu night). | ||||||||||||||||||||||||
Tue 12 | Wednesday 13 | Thursday 14 | Fri 15 | |||||||||||||||||||||
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 | 4 AM | 7 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
WNW 4 | NW 5 | SSW 8 | S 18 | WNW 4 | WNW 5 | WNW 6 | WNW 7 | NW 7 | NW 6 | SW 7 | SW 7 | SW 7 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | |
37 | 60 | 7 | 12 | 29 | 123 | 351 | 486 | 439 | 287 | 19 | 10 | 10 | 10 | 10 | 10 | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | |
High Tide | 7:00PM3.17m | 7:03AM3.52m | 7:41PM3.46m | 7:48AM3.79m | 8:21PM3.75m | |||||||||||||||||||
Low Tide | 1:04PM0.90m | 1:22AM1.11m | 1:55PM0.61m | 2:15AM0.82m | 2:43PM0.34m | 3:03AM0.52m | ||||||||||||||||||
 |  | | |  |  |  |  | | |  |  | | |  | | | | | | | | | | |
 | 5:24 | — | — | — | — | — | 5:22 | — | — | — | — | — | — | — | 5:20 | — | — | — | — | — | — | — | 5:18 | — |
 | — | — | — | 9:05 | — | — | — | — | — | — | — | 9:06 | — | — | — | — | — | — | — | 9:07 | — | — | — | 9:09 |
— | — | — | — | — | — | 1 | 1 | 1 | — | — | 1 | — | — | — | — | 1 | 1 | 1 | — | — | — | — | 1 | |
Temp °C | 10 | 10 | 11 | 12 | 11 | 9 | 8 | 8 | 9 | 10 | 10 | 10 | 9 | 8 | 8 | 8 | 9 | 10 | 10 | 10 | 9 | 9 | 9 | 8 |
3 | 3 | 6 | 6 | 3 | 0 | -2 | -2 | 0 | 1 | 3 | 3 | 1 | -1 | 0 | 0 | 1 | 2 | 4 | 4 | 5 | 4 | 3 | 2 | |
Swell 1 Height (m) Direction Period (s) | SSW 9 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SSW 8 | SW 6 | SW 7 | SW 7 | SW 7 | SW 7 | SW 7 | SW 8 | SW 7 | SW 7 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 |
 kJ | 7 | 7 | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 18 | 19 | 9 | 8 | 2 | 2 | 2 | 2 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
Swell 2 Height (m) Direction Period (s) | — | — | — | S 18 | SW 18 | SW 18 | SW 18 | SW 17 | SSW 8 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | S 7 | SW 7 | SW 7 | SW 14 | — | — | — |
| kJ | — | — | — | 6 | 12 | 12 | 12 | 12 | 6 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 9 | 1 | 2 | 2 | 8 | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | SW 18 | — | — | — | — | SW 17 | W 16 | — | — | S 8 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | 12 | — | — | — | — | 11 | 5 | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WNW 4 | NW 5 | NW 5 | NW 5 | WNW 4 | WNW 5 | WNW 6 | WNW 7 | NW 7 | NW 6 | NW 6 | NNW 6 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | NNW 7 | NNW 7 | NNW 6 |
| kJ | 37 | 60 | 42 | 31 | 29 | 123 | 351 | 486 | 439 | 287 | 269 | 249 | 363 | 545 | 639 | 374 | 275 | 263 | 212 | 198 | 212 | 339 | 240 | 135 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 290 | 318 | 413 | 282 | 282 | 277 | 290 | 295 | 592 | 886 | 881 | 881 | 605 | 618 | 339 | 339 | 351 | 351 | 329 | 284 | 75 | 180 | 87 | 325 |
Best forecast wave conditions in Anglesy | ||||||||||||||||||||||||
Best forecast wave conditions in United Kingdom | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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Ocean Swells (m)- Wind Speed (km/h)
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