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Trearddur Bay (Holy Island) Surf Forecast
/ Wales – Anglesy (10 surf breaks) /
Surf Forecasts:
Trearddur Bay (Holy Island) surfForecast / Wales – Anglesy / UK
48hr Weather and Surf, issued 6 pm Monday 20 Apr 2026 BSTForecast 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
9.9° C
(Which is 1.2°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: 0.1m 15s primary swell from a Southwest direction (forecast issued at 06:00pm April 20). An open ocean swell of 0.2m 3s is not directed at the surf break, a second open ocean swell of 0.3m 3s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (20 Apr) | - | - |
| Afternoon (20 Apr) | 0.5ft (0.1m) | 15s |
| Evening (20 Apr) | 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
Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | |||||||||||||||||||||
| 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 | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 15 | 15 | 15 | 14 | 3 | 3 | 13 | 13 | 13 | 13 | 13 | 13 | 4 | 4 | 5 | 12 | 4 | 12 | 12 | 9 | 9 | 8 | 12 | 5 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 8 | 8 | 8 | 4 | 0 | 0 | 7 | 7 | 7 | 7 | 7 | 3 | 0 | 0 | 2 | 3 | 1 | 3 | 3 | 2 | 2 | 1 | 3 | 2 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off |
High Tide / height (m) | 1:01PM 5.70 | 1:21AM 5.52 | 1:52PM 5.43 | 2:12AM 5.29 | 2:50PM 5.09 | 3:10AM 5.02 | ||||||||||||||||||
Low Tide / height (m) | 7:10PM 0.73 | 7:36AM 0.70 | 7:59PM 1.09 | 8:32AM 0.99 | 8:55PM 1.50 | 9:36AM 1.31 | ||||||||||||||||||
Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | 6:07 | - | - | - | - | - | - | - | 6:03 | - | - | - | - | - | - | - | 6:01 | - | - |
| Sunset | - | 8:25 | - | - | - | - | - | - | - | 8:28 | - | - | - | - | - | - | - | 8:30 | - | - | - | - | - | - |
 | |  | |  |  | | |  | | | | | | | | | |  | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 11 | 10 | 11 | 10 | 8 | 5 | 7 | 11 | 13 | 12 | 9 | 7 | 6 | 6 | 7 | 12 | 14 | 13 | 11 | 9 | 8 | 9 | 10 | 12 |
| Feels °C (?) | 7 | 5 | 7 | 4 | 1 | -2 | 0 | 3 | 5 | 5 | 1 | -1 | -2 | -2 | -1 | 5 | 8 | 7 | 5 | 3 | 2 | 3 | 5 | 9 |
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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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