- Forecast
- Maps
- Live
- Weather State
- Spot Information
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 12 pm Thursday 28 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
12.2° C
(Which is slightly warmer than usual)Trearddur Bay (Holy Island) surf forecast from 28 May 2026:
- Best quality surf: Monday 1 Jun, 7PM (local time) - 4.5ft (1.3m), 5s period, SSW swell with cross-offshore winds.
- Most powerful swell: Wednesday 3 Jun, 1PM (local time) - 7ft (2.2m), 6s period, SW swell with 396 kJ wave energy.
- Next surfable swell (1★+): Monday 1 Jun, 7PM (local time) - 4.5ft (1.3m), 5s period with SSW swell.
Best Forecast Surf Conditions for Trearddur Bay (Holy Island) this week:
The surf forecast for Trearddur Bay (Holy Island) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Jun 01) at 7PM. The primary swell is predicted to be 1.3m and 5s period with a secondary swell of 0.1m and 14s. Another secondary swell of 0.1m and 14s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Trearddur Bay (Holy Island) in the next 16 days are 2.2m 6s and forecast to arrive on Wednesday (Jun 03) at 1PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.1m 4s period and expected on Thursday (May 28) at 4PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7PM (Mon 1st Jun) | 4.5ft (1.3m) 5s |
| Best Surf | 7PM (Mon 1st Jun) | 4.5ft (1.3m) 5s |
| Most Powerful | 1PM (Wed 3rd Jun) | 7ft (2.2m) 6s |
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 ForecastMostly dry. Very mild (max 18°C on Thu morning, min 12°C on Thu night). Mainly fresh winds. | Days 4-6 Weather SummaryModerate rain (total 10mm), heaviest on Mon night. Very mild (max 14°C on Sun morning, min 12°C on Sun night). Mainly fresh winds. | ||||||||||||||||||||
Thursday 28 | Friday 29 | Saturday 30 | Sunday 31 | Monday 1 | Tuesday 2 | Wednesday 3 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
S 4 | SSW 4 | SSW 5 | SW 5 | SW 5 | SSW 5 | SSW 4 | SSW 4 | SSW 5 | SW 5 | SW 12 | SW 6 | SSW 6 | SSW 5 | SW 6 | SW 6 | SW 7 | SSW 6 | SW 6 | SW 8 | SW 7 | |
9 | 10 | 80 | 33 | 23 | 45 | 15 | 22 | 46 | 29 | 23 | 31 | 31 | 62 | 77 | 58 | 121 | 107 | 263 | 392 | 189 | |
Wind (km/h) | |||||||||||||||||||||
cross-on | on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-on | cross | cross-on | cross-on | |
High Tide | 9:44PM4.93m | 10:01AM4.96m | 10:20PM5.05m | 10:38AM4.98m | 10:54PM5.16m | 11:13AM5.00m | 11:28PM5.23m | 11:48AM4.99m | 00:02AM5.27m | 12:24PM4.95m | 00:38AM5.25m | 1:01PM4.86m | 1:14AM5.18m | ||||||||
Low Tide | 3:28PM1.30m | 3:46AM1.44m | 4:06PM1.27m | 4:25AM1.34m | 4:42PM1.25m | 5:01AM1.27m | 5:16PM1.26m | 5:37AM1.23m | 5:51PM1.30m | 6:13AM1.23m | 6:26PM1.37m | 6:50AM1.27m | 7:02PM1.48m | ||||||||
 | |  |  | | | | | | | |  |  |  |  | | | |  | |  | |
 | 5:01 | — | — | 5:00 | — | — | 4:58 | — | — | 4:58 | — | — | 4:58 | — | — | 4:56 | — | — | 4:56 | — | — |
 | — | — | 9:30 | — | — | 9:30 | — | — | 9:31 | — | — | 9:34 | — | — | 9:35 | — | — | 9:36 | — | — | 9:37 |
— | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 7 | — | — | — | 5 | — | 5 | |
Temp °C | 18 | 14 | 14 | 14 | 15 | 13 | 13 | 14 | 13 | 14 | 14 | 14 | 13 | 14 | 13 | 13 | 14 | 14 | 13 | 13 | 12 |
16 | 11 | 8 | 10 | 11 | 9 | 8 | 9 | 8 | 10 | 9 | 11 | 10 | 10 | 11 | 9 | 12 | 13 | 7 | 5 | 4 | |
Swell 1 Height (m) Direction Period (s) | NE 5 | NE 4 | SW 16 | SW 15 | SW 15 | SW 15 | SW 16 | SW 14 | SW 14 | SW 12 | SW 12 | SW 6 | WNW 3 | SW 14 | SW 14 | NW 4 | SW 13 | SSW 6 | — | WNW 5 | SW 11 |
 kJ | 4 | 1 | 10 | 9 | 8 | 9 | 10 | 8 | 32 | 23 | 23 | 31 | 1 | 8 | 8 | 4 | 7 | 107 | — | 33 | 43 |
Swell 2 Height (m) Direction Period (s) | — | SW 16 | — | — | — | SW 11 | SW 11 | SW 11 | SW 14 | SW 15 | SW 15 | SW 12 | SW 11 | SW 14 | W 10 | SW 13 | — | SW 13 | — | — | — |
| kJ | — | 10 | — | — | — | 5 | 5 | 4 | 33 | 9 | 9 | 23 | 5 | 8 | 2 | 7 | — | 7 | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | SW 15 | W 9 | SW 8 | SW 8 | — | — | — | SW 14 | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | 9 | 2 | 3 | 2 | — | — | — | 8 | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | S 4 | SSW 4 | SSW 5 | SW 5 | SW 5 | SSW 5 | SSW 4 | SSW 4 | SSW 5 | SW 5 | SW 4 | WNW 3 | SSW 6 | SSW 5 | SW 6 | SW 6 | SW 7 | SSE 4 | SW 6 | SW 8 | SW 7 |
| kJ | 9 | 10 | 80 | 33 | 23 | 45 | 15 | 22 | 46 | 29 | 19 | 2 | 31 | 62 | 77 | 58 | 121 | 20 | 263 | 392 | 189 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 381 | 589 | 284 | 347 | 305 | 179 | 210 | 292 | 114 | 51 | 348 | 98 | 249 | 234 | 249 | 179 | 55 | 249 | 275 | 246 | 276 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
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.
Nearest