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Surf Forecasts:
Cable Bay (Porth Trecastell) surfForecast / Wales – Anglesy / UK
48hr Weather and Surf, issued 11 pm Tuesday 16 Dec 2025 GMTForecast 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 1.0°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 1AM is: 1.5m 5s primary swell from a South-southwest direction and 0.2m 16s secondary swell from a West-southwest direction (forecast issued at 11:00pm December 16). The wind direction is predicted to be cross-onshore.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Dec) | 11ft (3.5m) | 8s |
| Afternoon (17 Dec) | 11ft (3.5m) | 9s |
| Evening (17 Dec) | 8ft (2.4m) | 9s |
Table - waves today at Cable Bay (Porth Trecastell). (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Wednesday 17 | Thursday 18 | Friday 19 | ||||||||||||||||||||||
| 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |  |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 8 | 4 | 6 | 7 | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 6 | 8 | 7 | 8 | 8 | 8 | 8 | 7 | 7 | 7 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 45 | 49 | 286 | 997 | 1608 | 2095 | 1900 | 1716 | 864 | 727 | 635 | 461 | 397 | 516 | 260 | 769 | 763 | 1178 | 1427 | 1268 | 966 | 720 | 541 | 398 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | on | on | on | on | on | cross- on | cross- on | cross- on | cross- on | on | on | on | on | on | on | on | on |
High Tide / height (m) | 7:02PM 3.33 | 7:28AM 3.42 | 7:45PM 3.42 | 8:06AM 3.56 | 8:25PM 3.50 | 8:42AM 3.67 | ||||||||||||||||||
Low Tide / height (m) | 1:50AM 0.88 | 2:13PM 0.86 | 2:30AM 0.79 | 2:52PM 0.70 | 3:07AM 0.70 | 3:30PM 0.58 | ||||||||||||||||||
Wednesday 17 | Thursday 18 | Friday 19 | ||||||||||||||||||||||
| Sunrise | - | - | - | - | 8:26 | - | - | - | - | - | - | - | 8:27 | - | - | - | - | - | - | - | 8:27 | - | - | - |
| Sunset | - | - | - | - | - | - | 4:00 | - | - | - | - | - | - | - | 4:00 | - | - | - | - | - | - | - | 4:00 | - |
 | |  |  |  | | |  | | |  | |  | | | |  | | | |  | | | | |
Rain (mm) | - | - | - | 1 | 5 | 4 | 1 | 10 | 5 | 1 | 1 | - | - | 1 | 1 | 3 | - | - | - | - | - | - | - | - |
| Temp. °C | 9 | 9 | 9 | 10 | 9 | 10 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 9 | 9 | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 10 | 10 |
| Feels °C (?) | 3 | 1 | -1 | -2 | -2 | -1 | 2 | 6 | 9 | 4 | 3 | 6 | 4 | 2 | 3 | -1 | -1 | -1 | -1 | -2 | -1 | -1 | 1 | 2 |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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