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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 12 am Friday 17 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
9.3° 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 6AM is: 2.1m 7s primary swell from a South-southwest direction and 0.2m 13s secondary swell from a West-southwest direction (forecast issued at 12:00am April 17). The wind direction is predicted to be cross-onshore.
| Time (BST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Apr) | 7ft (2.1m) | 7s |
| Afternoon (17 Apr) | 6.5ft (2.0m) | 7s |
| Evening (17 Apr) | 7ft (2.2m) | 7s |
Table - waves today at Trearddur Bay (Holy Island). (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Friday 17 | Saturday 18 | Sunday 19 | ||||||||||||||||||||||
| 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 | 4 PM | 7 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |  |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 6 | 6 | 6 | 7 | 7 | 7 | 6 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 16 | 16 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 144 | 172 | 280 | 458 | 431 | 342 | 330 | 424 | 381 | 230 | 149 | 97 | 61 | 42 | 33 | 27 | 20 | 16 | 10 | 9 | 9 | 5 | 5 | 5 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | cross- on | cross- on | cross- on | on | cross- on | on | on | on | on | cross- on | cross | cross | cross | cross | cross- off | off | off | glass | glass | cross- off | cross- off | off |
High Tide / height (m) | 10:39PM 5.43 | 10:52AM 5.75 | 11:16PM 5.60 | 11:32AM 5.86 | 11:55PM 5.68 | 12:15PM 5.85 | ||||||||||||||||||
Low Tide / height (m) | 4:41AM 0.69 | 5:02PM 0.41 | 5:20AM 0.50 | 5:42PM 0.37 | 6:02AM 0.43 | 6:24PM 0.48 | ||||||||||||||||||
Friday 17 | Saturday 18 | Sunday 19 | ||||||||||||||||||||||
| Sunrise | - | - | - | 6:15 | - | - | - | - | - | - | - | 6:13 | - | - | - | - | - | - | - | 6:11 | - | - | - | - |
| Sunset | - | - | - | - | - | - | - | 8:21 | - | - | - | - | - | - | - | 8:22 | - | - | - | - | - | - | - | 8:24 |
 |  | |  |  |  |  | |  |  | | | | | | | | | |  | | | | | |
Rain (mm) | 1 | - | - | 2 | 1 | - | - | - | - | - | - | - | 1 | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 8 | 8 | 8 | 10 | 11 | 10 | 9 | 8 | 8 | 8 | 8 | 9 | 8 |
| Feels °C (?) | 3 | 2 | 1 | 1 | 2 | 2 | 1 | 2 | 1 | 3 | 4 | 3 | 3 | 3 | 5 | 7 | 6 | 6 | 5 | 6 | 6 | 4 | 4 | 4 |
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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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