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Trearddur Bay (Holy Island) Surf Forecast
/ Wales – Anglesy (10 surf breaks) /
Trearddur Bay (Holy Island) surfForecast / Wales – Anglesy / UK
12 Day Weather and Surf, issued 12 am Monday 23 Jun 2025 BST
Best Forecast Surf Conditions for Trearddur Bay (Holy Island) this week:
The surf forecast for Trearddur Bay (Holy Island) over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Jun 29) at 4AM. The primary swell is predicted to be 1.0m and 6s period with a secondary swell of 0.1m and 13s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Trearddur Bay (Holy Island) in the next 12 days are 2.4m 7s and forecast to arrive on Friday (Jun 27) at 7PM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Sun 29th Jun) | 3.5ft (1.0m) 6s |
| Best Surf | 10AM (Sun 29th Jun) | 6.5ft (2.0m) 6s |
| Most Powerful | 7PM (Fri 27th Jun) | 8ft (2.4m) 7s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 12 days.
Monday 23 | Tuesday 24 | Wednesday 25 | Thursday 26 | Friday 27 | Saturday 28 | Sunday 29 | Monday 30 | Tuesday 01 | Wednesday 02 | Thursday 03 | Fri 04 | |||||||||||||||||||||||||
| Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | |
Rating (10 max) | ||||||||||||||||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  |  |  |  |  |  | |||||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||||||||||||||
| Period(s) (?) | 6 | 5 | 7 | 6 | 6 | 6 | 6 | 6 | 4 | 5 | 5 | 4 | 7 | 7 | 7 | 7 | 6 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 4 | 7 | 6 | 6 | 4 | 4 | 5 | 7 | 7 |
Wave (?)Graph  | ||||||||||||||||||||||||||||||||||||
| Energy (?) | 160 | 131 | 95 | 77 | 209 | 155 | 99 | 25 | 30 | 86 | 47 | 42 | 370 | 412 | 508 | 364 | 85 | 122 | 67 | 303 | 229 | 250 | 32 | 16 | 22 | 8 | 11 | 9 | 23 | 11 | 9 | 15 | 15 | 83 | 214 | 189 |
Wind (km/h) | ||||||||||||||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | cross- on | cross- on | on | on | on | cross- on | cross- on | cross- on | cross- on | cross- on | cross- on | on | cross- on | on | on | cross- on | on | on | glass | cross- on | cross- on | cross- on | cross- on | on | on | on | cross- on | cross- on | cross- on | cross- on | on | on | glass | glass | cross- off |
High Tide / height (m) | 9:00AM 5.19 | 9:34PM 5.17 | 9:58AM 5.31 | 10:26PM 5.36 | 10:53AM 5.39 | 11:15PM 5.51 | 11:44AM 5.41 | 12:03AM 5.60 | 12:33PM 5.35 | 12:49AM 5.61 | 1:21PM 5.23 | 1:35AM 5.52 | 2:07PM 5.06 | 2:19AM 5.36 | 2:52PM 4.85 | 3:03AM 5.14 | 3:37PM 4.65 | 3:48AM 4.90 | 4:25PM 4.46 | 4:37AM 4.67 | 5:19PM 4.33 | 5:34AM 4.48 | 6:21PM 4.28 | |||||||||||||
Low Tide / height (m) | 2:45AM 1.27 | 3:13PM 1.06 | 3:42AM 1.04 | 4:06PM 0.98 | 4:36AM 0.84 | 4:57PM 0.94 | 5:27AM 0.69 | 5:45PM 0.94 | 6:17AM 0.63 | 6:32PM 1.00 | 7:06AM 0.68 | 7:18PM 1.13 | 7:53AM 0.81 | 8:03PM 1.30 | 8:40AM 1.01 | 8:47PM 1.51 | 9:26AM 1.26 | 9:33PM 1.73 | 10:15AM 1.50 | 10:23PM 1.94 | 11:07AM 1.73 | 11:20PM 2.12 | 12:06PM 1.89 | |||||||||||||
Monday 23 | Tuesday 24 | Wednesday 25 | Thursday 26 | Friday 27 | Saturday 28 | Sunday 29 | Monday 30 | Tuesday 01 | Wednesday 02 | Thursday 03 | Fri 04 | |||||||||||||||||||||||||
| Sunrise | - | 4:50 | - | - | 4:50 | - | - | 4:50 | - | - | 4:52 | - | - | 4:52 | - | - | 4:52 | - | - | 4:52 | - | - | 4:54 | - | - | 4:54 | - | - | 4:54 | - | - | 4:56 | - | - | 4:56 | - |
| Sunset | - | - | 9:50 | - | - | 9:50 | - | - | 9:50 | - | - | 9:50 | - | - | 9:50 | - | - | 9:50 | - | - | 9:49 | - | - | 9:49 | - | - | 9:49 | - | - | 9:47 | - | - | 9:47 | - | - | 9:46 |
 |  |  |  | | |  | | | | | | |  | | | |  |  | | | | | | | |  | | | | | | | | | | |
Rain (mm) | 1 | - | - | 1 | - | - | - | - | - | 3 | - | - | 3 | 1 | - | - | - | - | - | - | - | - | - | - | 2 | - | 3 | 1 | - | - | 1 | - | - | 3 | - | - |
| Temp. °C | 16 | 14 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 13 | 14 | 15 | 15 | 16 | 16 | 15 | 15 | 14 | 15 | 17 | 17 | 17 | 17 | 15 | 14 | 15 | 14 | 12 | 14 | 15 | 14 | 14 | 13 | 13 | 14 |
| Feels °C (?) | 11 | 9 | 13 | 12 | 11 | 12 | 13 | 13 | 9 | 10 | 7 | 8 | 10 | 8 | 10 | 11 | 13 | 12 | 12 | 13 | 14 | 14 | 12 | 13 | 15 | 9 | 9 | 10 | 9 | 9 | 12 | 13 | 12 | 12 | 12 | 12 |
Short Range Forecast: Light rain (total 2mm), mostly falling on Sun night. Very mild (max 16°C on Sun night, min 12°C on Sun night). Winds decreasing (fresh winds from the W on Sun night, light winds from the S by Tue night). | Days 3-6 Weather Summary Light rain (total 7mm), mostly falling on Wed night. Very mild (max 16°C on Fri afternoon, min 13°C on Thu morning). Winds decreasing (strong winds from the SSW on Fri morning, light winds from the SW by Sat morning). | Days 6-9 Weather Summary Light rain (total 5mm), mostly falling on Tue afternoon. Very mild (max 17°C on Sun afternoon, min 13°C on Tue morning). Winds increasing (calm on Sat night, fresh winds from the SSW by Mon morning). | Long Range Forecast: Light rain (total 5mm), mostly falling on Tue night. Very mild (max 15°C on Wed night, min 11°C on Thu night). Winds decreasing (fresh winds from the WNW on Tue night, calm by Thu night). | |||||||||||||||||||||||||||||||||
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Trearddur Bay (Holy Island) surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Trearddur Bay (Holy Island) Surf forecast
The above surf forecast table for Trearddur Bay (Holy Island) provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Trearddur Bay (Holy Island) can be found by selecting the local surf guide option on the grey menu. Our Trearddur Bay (Holy Island) surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Trearddur Bay (Holy Island)) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Trearddur Bay (Holy Island) may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Are you planning a holiday in Anglesy? If you are looking for accommodation near Trearddur Bay (Holy Island), camping, hotels and holiday cottages in Anglesy, consider staying in Holyhead which is 4 km (2 miles) away. Other places in and around Anglesy where you can find information about places to rent, and car hire include Anglesey which is 7 km (4 miles) away, Bangor, Porthmadog and Llandudno.
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