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Surf Forecasts:
Trearddur Bay (Holy Island) surfForecast / Wales – Anglesy / UK
48hr Weather and Surf, issued 5 pm Monday 15 Dec 2025 GMTForecast update in hr min s Forecast update imminent
Trearddur Bay (Holy Island) surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Trearddur Bay (Holy Island) 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 Trearddur Bay (Holy Island) today?
The current surf forecast for Trearddur Bay (Holy Island) at 11PM is: 0.8m 8s primary swell from a South-southwest direction and 0.1m 14s secondary swell from a Southwest direction (forecast issued at 05:00pm December 15). The wind direction is predicted to be cross-shore.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (15 Dec) | - | - |
| Afternoon (15 Dec) | 3.5ft (1.1m) | 9s |
| Evening (15 Dec) | 2.5ft (0.8m) | 8s |
Table - waves today at Trearddur Bay (Holy Island). (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Monday 15 | Tuesday 16 | Wednesday 17 | Thursday 18 | |||||||||||||||||||||
| 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 | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 4 | 5 | 7 | 8 | 8 | 9 | 9 | 10 | 10 | 10 | 9 | 9 | 9 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 182 | 126 | 88 | 86 | 58 | 56 | 40 | 39 | 28 | 22 | 45 | 28 | 157 | 672 | 1569 | 1862 | 2247 | 2898 | 1563 | 1007 | 708 | 460 | 398 | 368 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | cross | cross | cross | cross | cross- on | on | on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | on | on | on | on | cross- on | cross- on |
High Tide / height (m) | 7:25PM 4.77 | 7:56AM 4.76 | 8:14PM 4.85 | 8:37AM 4.94 | 8:55PM 4.94 | 9:14AM 5.11 | ||||||||||||||||||
Low Tide / height (m) | 1:08PM 2.14 | 1:39AM 1.81 | 1:58PM 1.99 | 2:22AM 1.72 | 2:42PM 1.83 | 3:01AM 1.64 | ||||||||||||||||||
Monday 15 | Tuesday 16 | Wednesday 17 | Thursday 18 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | 8:26 | - | - | - | - | - | - | - | 8:27 | - | - | - | - | - | - | - | 8:27 | - |
| Sunset | 4:00 | - | - | - | - | - | - | - | 4:00 | - | - | - | - | - | - | - | 4:00 | - | - | - | - | - | - | - |
 |  | | | |  |  |  | |  | | | | |  | | |  |  | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 2 | 3 | 2 | 7 | 5 | - | - | - | - | - |
| Temp. °C | 10 | 9 | 9 | 9 | 9 | 8 | 8 | 9 | 9 | 9 | 9 | 9 | 9 | 10 | 9 | 10 | 10 | 11 | 11 | 11 | 10 | 10 | 10 | 10 |
| Feels °C (?) | 6 | 5 | 5 | 5 | 5 | 3 | 4 | 5 | 5 | 4 | 3 | 1 | -1 | -2 | -4 | -1 | -1 | 3 | 7 | 9 | 7 | 6 | 5 | 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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