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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
16 Day Weather and Surf, issued 6 pm Sunday 17 May 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
10.9° C
(Which is normal for this time of year)Best Forecast Surf Conditions for Trearddur Bay (Holy Island) this week:
The most powerful waves expected at Trearddur Bay (Holy Island) in the next 16 days are 2.5m 8s and forecast to arrive on Tuesday (May 19) at 10PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Sunday (May 24) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Tue 19th May) | 8ft (2.5m) 8s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastModerate rain (total 14mm), heaviest on Mon night. Very mild (max 12°C on Mon night, min 9°C on Sun afternoon). Winds increasing (light winds from the WSW on Mon morning, strong winds from the SSW by Tue afternoon). | Days 5-7 Weather SummarySome drizzle, heaviest during Wed night. Very mild (max 18°C on Thu night, min 12°C on Wed afternoon). Winds decreasing (fresh winds from the SSW on Wed afternoon, light winds from the WSW by Sat morning). | ||||||||||||||||||||
Sun 17 | Monday 18 | Tuesday 19 | Wednesday 20 | Thursday 21 | Friday 22 | Saturday 23 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
SW 4 | SW 6 | SW 6 | SSW 6 | SSW 5 | SSW 7 | SSW 7 | SW 8 | SW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 7 | SSW 5 | SSW 6 | SSW 6 | SW 6 | SW 6 | SSW 7 | SSW 7 | |
39 | 86 | 42 | 37 | 84 | 237 | 450 | 681 | 255 | 268 | 218 | 241 | 154 | 57 | 57 | 51 | 26 | 10 | 7 | 7 | 5 | |
Wind (km/h) | |||||||||||||||||||||
on | on | on | cross-on | cross | cross-on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-off | off | off | |
High Tide | 11:36PM5.65m | 12:02PM5.69m | 00:23AM5.65m | 12:54PM5.57m | 1:14AM5.57m | 1:49PM5.35m | 2:07AM5.42m | 2:48PM5.08m | 3:05AM5.23m | 3:51PM4.82m | 4:08AM5.03m | 5:00PM4.63m | 5:18AM4.88m | ||||||||
Low Tide | 5:21PM0.55m | 5:47AM0.50m | 6:09PM0.66m | 6:37AM0.52m | 6:58PM0.86m | 7:31AM0.65m | 7:51PM1.14m | 8:28AM0.85m | 8:47PM1.43m | 9:29AM1.08m | 9:48PM1.70m | 10:36AM1.28m | 10:57PM1.88m | 11:47AM1.40m | |||||||
 |  |  |  | | | | | |  |  | | |  | | | | | |  | | |
 | — | — | 5:15 | — | — | 5:13 | — | — | 5:11 | — | — | 5:09 | — | — | 5:09 | — | — | 5:07 | — | — | 5:05 |
 | — | 9:13 | — | — | 9:15 | — | — | 9:16 | — | — | 9:17 | — | — | 9:20 | — | — | 9:21 | — | — | 9:22 | 9:23 |
2 | 2 | — | — | 9 | — | — | 1 | — | — | 1 | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 10 | 10 | 9 | 11 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 13 | 16 | 18 | 15 | 16 | 16 | 16 | 18 | 17 | 21 |
3 | 4 | 6 | 6 | 6 | 5 | 3 | 3 | 6 | 5 | 6 | 7 | 12 | 14 | 12 | 13 | 13 | 16 | 16 | 14 | 22 | |
Swell 1 Height (m) Direction Period (s) | NNW 4 | — | SW 6 | — | SW 5 | — | — | — | SW 14 | — | — | SW 15 | — | SSW 7 | SW 10 | SW 12 | SSW 6 | SW 6 | SW 6 | SSW 7 | NNW 5 |
 kJ | 2 | — | 42 | — | 40 | — | — | — | 52 | — | — | 9 | — | 57 | 17 | 24 | 26 | 10 | 6 | 5 | 17 |
Swell 2 Height (m) Direction Period (s) | SW 12 | — | NW 4 | — | — | — | — | — | — | — | — | — | — | SW 15 | WSW 13 | WSW 8 | SW 10 | SW 10 | SW 9 | SW 8 | SSW 7 |
| kJ | 6 | — | 2 | — | — | — | — | — | — | — | — | — | — | 8 | 17 | 6 | 4 | 4 | 3 | 3 | 5 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 13 | SW 14 | SW 13 | SW 14 | SW 8 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 7 | 7 | 7 | 7 | 3 |
Wind waves Height (m) Direction Period (s) | SW 4 | SW 6 | NW 4 | SSW 6 | SSW 5 | SSW 7 | SSW 7 | SW 8 | SW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | — | SSW 5 | SSW 6 | — | — | — | NNE 3 | NE 4 |
| kJ | 39 | 86 | 3 | 37 | 84 | 237 | 450 | 681 | 255 | 268 | 218 | 241 | 154 | — | 57 | 51 | — | — | — | 1 | 4 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 235 | 235 | 51 | 249 | 315 | 249 | 281 | 251 | 376 | 234 | 114 | 189 | 186 | 59 | 186 | 51 | 51 | 51 | 51 | 179 | 163 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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 16 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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