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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 Sunday 17 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
11.1° C
(Which is 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 6PM is: 1.1m 5s primary swell from a Southwest direction and 0.1m 12s secondary swell from a West direction (forecast issued at 12:00pm May 17). The wind direction is predicted to be onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 May) | 3ft (0.9m) | 4s |
| Afternoon (17 May) | 3.5ft (1.0m) | 4s |
| Evening (17 May) | 3.5ft (1.1m) | 5s |
Table - waves today at Cable Bay (Porth Trecastell). (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastModerate rain (total 18mm), heaviest on Mon night. Very mild (max 12°C on Tue morning, min 9°C on Sun morning). Winds increasing (light winds from the SSW on Sun night, strong winds from the SSW by Tue afternoon). | ||||||||||||||||||||||||
Sun 17 | Monday 18 | Tuesday 19 | Wed 20 | |||||||||||||||||||||
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 |    |    |    |    | ||||||||||||||||||||
W 4 | SW 4 | SW 4 | SW 5 | SW 5 | SW 5 | SW 6 | SW 6 | SW 6 | SW 6 | SW 6 | SSW 3 | SSW 4 | SSW 5 | S 6 | SSW 7 | SSW 7 | SSW 6 | SSW 7 | SW 7 | SW 8 | SW 8 | SW 8 | SW 8 | |
33 | 20 | 45 | 60 | 68 | 56 | 49 | 45 | 30 | 18 | 18 | 8 | 17 | 38 | 127 | 240 | 223 | 297 | 603 | 761 | 782 | 616 | 682 | 560 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-on | on | on | on | on | cross-on | on | on | on | on | on | cross-on | cross | cross | cross | cross-on | cross-on | cross-on | on | on | on | on | on | on | |
High Tide | 10:02AM4.30m | 10:24PM4.29m | 10:49AM4.27m | 11:09PM4.30m | 11:39AM4.11m | 11:57PM4.21m | ||||||||||||||||||
Low Tide | 5:00PM-0.03m | 5:24AM-0.11m | 5:47PM0.04m | 6:14AM-0.11m | 6:36PM0.21m | |||||||||||||||||||
 |  | |  |  |  |  | | | | | | | | |  | | | | | | |  | | |
 | 5:16 | — | — | — | — | — | 5:15 | — | — | — | — | — | — | — | 5:13 | — | — | — | — | — | — | — | 5:11 | — |
 | — | — | — | 9:13 | — | — | — | — | — | — | — | 9:14 | — | — | — | — | — | — | — | 9:15 | — | — | — | 9:16 |
1 | — | 1 | — | — | 2 | — | 1 | — | — | — | — | — | 1 | 2 | 5 | 1 | — | — | — | 2 | 1 | 1 | — | |
Temp °C | 9 | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 10 | 10 | 11 | 11 | 10 | 10 | 10 | 11 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 11 |
4 | 4 | 4 | 4 | 4 | 5 | 7 | 7 | 7 | 6 | 7 | 6 | 6 | 5 | 5 | 6 | 7 | 6 | 3 | 4 | 4 | 5 | 5 | 6 | |
Swell 1 Height (m) Direction Period (s) | — | WNW 4 | NNW 4 | — | — | — | SW 6 | SW 6 | SW 6 | — | — | — | SSW 6 | SW 5 | SW 6 | — | — | — | — | — | — | — | — | — |
 kJ | — | 7 | 2 | — | — | — | 49 | 45 | 29 | — | — | — | 4 | 18 | 52 | — | — | — | — | — | — | — | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | W 12 | — | — | — | WNW 4 | WNW 4 | WNW 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 3 | — | — | — | 3 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | W 4 | SW 4 | SW 4 | SW 5 | SW 5 | SW 5 | NW 4 | — | SW 6 | SW 6 | SW 6 | SSW 3 | SSW 4 | SSW 5 | S 6 | SSW 7 | SSW 7 | SSW 6 | SSW 7 | SW 7 | SW 8 | SW 8 | SW 8 | SW 8 |
| kJ | 33 | 20 | 45 | 60 | 68 | 56 | 3 | — | 30 | 18 | 18 | 8 | 17 | 38 | 127 | 240 | 223 | 297 | 603 | 761 | 782 | 616 | 682 | 560 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 277 | 261 | 244 | 256 | 244 | 244 | 44 | 44 | 44 | 44 | 259 | 259 | 259 | 285 | 285 | 285 | 259 | 333 | 302 | 277 | 277 | 256 | 316 | 261 |
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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