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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 6 pm Monday 18 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 12AM is: 1.4m 6s primary swell from a South-southwest direction and 0.9m 6s secondary swell from a Southwest direction (forecast issued at 06:00pm May 18). The wind direction is predicted to be cross-shore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (19 May) | - | - |
| Afternoon (19 May) | 2.5ft (0.7m) | 6s |
| Evening (19 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 ForecastModerate rain (total 10mm), heaviest on Mon night. Very mild (max 15°C on Thu morning, min 10°C on Mon night). Winds increasing (moderate winds from the S on Mon afternoon, strong winds from the SSW by Tue night). | ||||||||||||||||||||||||
Mon 18 | Tuesday 19 | Wednesday 20 | Thu 21 | |||||||||||||||||||||
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 | 10 AM | 1 PM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
SSW 6 | SSW 4 | S 5 | S 6 | SSW 6 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SW 8 | SW 8 | SW 8 | SW 8 | SW 7 | SW 6 | SSW 6 | SSW 7 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | |
45 | 22 | 56 | 181 | 260 | 230 | 298 | 335 | 418 | 513 | 620 | 681 | 507 | 401 | 363 | 268 | 230 | 246 | 313 | 238 | 226 | 288 | 241 | 179 | |
Wind (km/h) | ||||||||||||||||||||||||
cross-on | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | on | on | on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | |
High Tide | 11:09PM4.30m | 11:39AM4.11m | 11:57PM4.21m | 12:31PM3.85m | 00:50AM4.04m | |||||||||||||||||||
Low Tide | 5:47PM0.04m | 6:14AM-0.11m | 6:36PM0.21m | 7:05AM-0.01m | 7:26PM0.43m | 8:01AM0.17m | ||||||||||||||||||
 | |  | | |  |  | |  | |  |  | | | |  | | |  | | | | | | |
 | — | — | — | — | 5:13 | — | — | — | — | — | — | — | 5:11 | — | — | — | — | — | — | — | 5:09 | — | — | — |
 | — | 9:14 | — | — | — | — | — | — | — | 9:15 | — | — | — | — | — | — | — | 9:16 | — | — | — | — | — | 9:19 |
— | — | 1 | 3 | 3 | 1 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 11 | 11 | 10 | 11 | 12 | 12 | 12 | 12 | 13 | 12 | 11 | 11 | 11 | 11 | 11 | 12 | 13 | 12 | 12 | 12 | 12 | 12 | 13 | 15 |
6 | 6 | 5 | 4 | 5 | 6 | 6 | 5 | 6 | 4 | 2 | 4 | 5 | 5 | 5 | 6 | 7 | 6 | 7 | 7 | 6 | 6 | 7 | 10 | |
Swell 1 Height (m) Direction Period (s) | — | — | SW 5 | SW 6 | — | — | — | — | — | — | — | — | SW 16 | — | SW 13 | SW 13 | SW 13 | WSW 13 | — | — | — | — | — | — |
 kJ | — | — | 28 | 75 | — | — | — | — | — | — | — | — | 10 | — | 83 | 26 | 26 | 17 | — | — | — | — | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 6 | SSW 4 | S 5 | S 6 | SSW 6 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SW 8 | SW 8 | SW 8 | SW 8 | SW 7 | SW 6 | SSW 6 | SSW 7 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 |
| kJ | 45 | 22 | 56 | 181 | 260 | 230 | 298 | 335 | 418 | 513 | 620 | 681 | 507 | 401 | 363 | 268 | 230 | 246 | 313 | 238 | 226 | 288 | 241 | 179 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 248 | 259 | 259 | 285 | 285 | 259 | 317 | 302 | 279 | 277 | 256 | 256 | 261 | 260 | 261 | 244 | 243 | 243 | 89 | 105 | 226 | 105 | 198 | 179 |
Best forecast wave conditions in Anglesy | ||||||||||||||||||||||||
Best forecast wave conditions in United Kingdom | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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