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Surf Forecasts:
Trearddur Bay (Holy Island) surfForecast / Wales – Anglesy / UK
48hr Weather and Surf, issued 5 pm Tuesday 30 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
10.0° C
(Which is slightly warmer than usual)How big are the waves at Trearddur Bay (Holy Island) today?
The current surf forecast for Trearddur Bay (Holy Island) at 12AM is: 0.1m 15s primary swell from a Southwest direction (forecast issued at 05:00pm December 30). The wind direction is predicted to be offshore.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (31 Dec) | - | - |
| Afternoon (31 Dec) | - | - |
| Evening (31 Dec) | 0.5ft (0.1m) | 15s |
Table - waves today at Trearddur Bay (Holy Island). (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Tuesday 30 | Wednesday 31 | Thursday 01 | Friday 02 | |||||||||||||||||||||
| 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) (?) | 4 | 16 | 15 | 15 | 14 | - | 13 | 2 | 3 | 4 | 4 | 5 | 5 | 6 | 6 | 10 | 9 | 9 | 14 | 13 | 13 | 8 | 13 | 8 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 0 | 10 | 8 | 8 | 4 | 0 | 4 | 1 | 8 | 19 | 28 | 52 | 99 | 204 | 295 | 4 | 3 | 3 | 4 | 7 | 7 | 3 | 3 | 3 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | off | off | off | glass | glass | cross | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | cross | cross- off | cross | cross | cross- off | cross- off | cross- off | cross | cross- off | cross- off | cross- off |
High Tide / height (m) | 6:22PM 5.06 | 7:08AM 4.92 | 7:31PM 5.20 | 8:08AM 5.13 | 8:33PM 5.33 | 9:03AM 5.41 | ||||||||||||||||||
Low Tide / height (m) | 12:08PM 1.83 | 12:44AM 1.48 | 1:15PM 1.61 | 1:46AM 1.40 | 2:16PM 1.36 | 2:42AM 1.22 | ||||||||||||||||||
Tuesday 30 | Wednesday 31 | Thursday 01 | Friday 02 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | - | 8:33 | - | - | - | - | - | - | - | 8:33 | - | - | - | - | - | - | - | 8:33 | - |
| Sunset | 4:07 | - | - | - | - | - | - | - | 4:08 | - | - | - | - | - | - | - | 4:09 | - | - | - | - | - | - | - |
 |  |  | | | |  | | | | |  | | |  | | | |  | | | | |  | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | - | - | - | 1 | 1 | 1 | 3 | 1 | - |
| Temp. °C | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 8 | 7 | 7 | 6 | 6 | 6 | 4 | 4 | 4 | 5 |
| Feels °C (?) | 0 | 0 | 1 | 2 | 3 | 2 | 2 | 0 | -1 | -2 | -2 | -4 | -4 | -4 | -2 | -3 | -4 | -5 | -4 | -4 | -6 | -6 | -6 | -5 |
- 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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