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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 Wednesday 20 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
11.2° C
(Which is slightly warmer than usual)How big are the waves at Cable Bay (Porth Trecastell) today?
The current surf forecast for Cable Bay (Porth Trecastell) at 8AM is: 1.8m 8s primary swell from a Southwest direction (forecast issued at 12:00am May 20). The wind direction is predicted to be onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 May) | 5.5ft (1.7m) | 8s |
| Afternoon (20 May) | 5.5ft (1.7m) | 6s |
| Evening (20 May) | 5ft (1.5m) | 6s |
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 5mm), mostly falling on Wed night. Very mild (max 17°C on Thu night, min 11°C on Tue night). Winds decreasing (strong winds from the SSW on Tue night, light winds from the SSE by Thu night). | ||||||||||||||||||||||||
Wednesday 20 | Thursday 21 | Friday 22 | ||||||||||||||||||||||
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 |    |    |    | |||||||||||||||||||||
SW 8 | SW 8 | SW 9 | SW 8 | SW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 7 | SSW 7 | SSW 4 | SSW 5 | SSW 5 | SSW 6 | SSW 6 | SSW 5 | SSW 5 | |
672 | 532 | 460 | 392 | 223 | 222 | 187 | 170 | 190 | 208 | 223 | 200 | 158 | 119 | 109 | 78 | 70 | 37 | 59 | 71 | 77 | 68 | 50 | 42 | |
Wind (km/h) | ||||||||||||||||||||||||
on | on | on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | |
High Tide | 11:57PM4.21m | 12:31PM3.85m | 00:50AM4.04m | 1:31PM3.54m | 1:49AM3.84m | 2:41PM3.27m | ||||||||||||||||||
Low Tide | 7:05AM-0.01m | 7:26PM0.43m | 8:01AM0.17m | 8:20PM0.68m | 9:00AM0.39m | 9:18PM0.91m | ||||||||||||||||||
 |  |  |  | | | |  |  |  |  | | | | | | | | | | | | | | |
 | — | 5:11 | — | — | — | — | — | — | — | 5:09 | — | — | — | — | — | — | — | 5:09 | — | — | — | — | — | — |
 | — | — | — | — | — | — | 9:16 | — | — | — | — | — | — | — | 9:19 | — | — | — | — | — | — | — | 9:20 | — |
1 | — | — | — | — | — | — | — | — | 2 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 11 | 11 | 11 | 12 | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 13 | 14 | 15 | 15 | 17 | 17 | 16 | 15 | 14 | 15 | 15 | 15 | 15 |
4 | 5 | 5 | 6 | 7 | 7 | 7 | 7 | 7 | 6 | 7 | 8 | 9 | 10 | 11 | 15 | 14 | 11 | 12 | 10 | 12 | 11 | 12 | 12 | |
Swell 1 Height (m) Direction Period (s) | WSW 16 | — | — | — | — | SW 13 | WSW 13 | SW 13 | — | WSW 10 | — | — | — | — | S 15 | SSW 7 | S 15 | SW 15 | WSW 9 | SW 9 | SW 13 | SW 10 | SW 10 | SW 10 |
 kJ | 26 | — | — | — | — | 26 | 16 | 7 | — | 19 | — | — | — | — | 4 | 78 | 4 | 8 | 9 | 14 | 7 | 16 | 16 | 17 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 15 | S 15 | W 15 | SW 14 | SW 15 | SW 8 | SW 8 | SW 8 | SW 8 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | 4 | 4 | 8 | 8 | 2 | 9 | 9 | 2 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 8 | SW 8 | SW 9 | SW 8 | SW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | — | SSW 7 | SSW 4 | SSW 5 | SSW 5 | SSW 6 | SSW 6 | SSW 5 | SSW 5 |
| kJ | 672 | 532 | 460 | 392 | 223 | 222 | 187 | 170 | 190 | 208 | 223 | 200 | 158 | 119 | 109 | — | 70 | 37 | 59 | 71 | 77 | 68 | 50 | 42 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 256 | 256 | 256 | 319 | 381 | 244 | 244 | 89 | 105 | 198 | 198 | 179 | 179 | 181 | 118 | 118 | 118 | 49 | 49 | 179 | 44 | 44 | 73 | 118 |
Best forecast wave conditions in Anglesy | ||||||||||||||||||||||||
Best forecast wave conditions in United Kingdom | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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