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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 11 pm Saturday 21 Mar 2026 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
8.8° 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 7AM is: 0.2m 9s primary swell from a South-southwest direction and 0.2m 3s secondary swell from a West-southwest direction (forecast issued at 11:00pm March 21). The wind direction is predicted to be glassy.
| Time (GMT) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (22 Mar) | 0.5ft (0.2m) | 9s |
| Afternoon (22 Mar) | 1.5ft (0.4m) | 4s |
| Evening (22 Mar) | 0.5ft (0.2m) | 9s |
Table - waves today at Trearddur Bay (Holy Island). (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Sunday 22 | Monday 23 | Tuesday 24 | ||||||||||||||||||||||
| 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) (?) | 9 | 8 | 9 | 9 | 9 | 4 | 4 | 9 | 9 | 11 | 10 | 10 | 10 | 9 | 9 | 4 | 5 | 6 | 6 | 7 | 7 | 7 | 7 | 7 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 7 | 7 | 7 | 8 | 7 | 7 | 6 | 8 | 8 | 12 | 10 | 10 | 24 | 23 | 47 | 21 | 62 | 200 | 406 | 540 | 596 | 444 | 293 | 143 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | on | glass | cross- on | cross- on | cross | cross- off | cross- off | cross- off | cross- off | off | cross | cross- on | cross- on | cross- on | cross- on | on | on | on | on | cross- on | cross- on | cross- on |
High Tide / height (m) | 11:56PM 5.60 | 12:16PM 5.80 | 12:36AM 5.48 | 1:00PM 5.56 | 1:20AM 5.25 | 1:52PM 5.21 | ||||||||||||||||||
Low Tide / height (m) | 6:04AM 0.55 | 6:27PM 0.63 | 6:47AM 0.75 | 7:11PM 0.97 | 7:36AM 1.06 | |||||||||||||||||||
Sunday 22 | Monday 23 | Tuesday 24 | ||||||||||||||||||||||
| Sunrise | - | - | - | - | 6:16 | - | - | - | - | - | - | - | 6:15 | - | - | - | - | - | - | - | 6:11 | - | - | - |
| Sunset | - | - | - | - | - | - | - | 6:34 | - | - | - | - | - | - | - | 6:36 | - | - | - | - | - | - | - | 6:37 |
 | | |  |  | | | | | | |  |  | | | | | | | |  | |  | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | 2 | 1 | - |
| Temp. °C | 10 | 9 | 9 | 8 | 8 | 9 | 9 | 8 | 8 | 7 | 7 | 6 | 6 | 6 | 7 | 7 | 8 | 9 | 9 | 10 | 10 | 9 | 10 | 8 |
| Feels °C (?) | 6 | 5 | 6 | 6 | 5 | 5 | 5 | 2 | 2 | 2 | 3 | 3 | 3 | 1 | 0 | -1 | -1 | 0 | -1 | 1 | 1 | 2 | 2 | -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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