Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 4 Jun 2026:
- Best quality surf: Saturday 6 Jun, 1PM (local time) - 4.5ft (1.4m), 9s period, SSW swell with cross-offshore winds.
- Most powerful swell: Thursday 11 Jun, 4PM (local time) - 10ft (3.0m), 8s period, SSW swell with 1,166 kJ wave energy.
- Next surfable swell (1★+): Saturday 6 Jun, 1PM (local time) - 4.5ft (1.4m), 9s 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 Saturday (Jun 06) at 1PM. The primary swell is predicted to be 1.4m and 9s period with a secondary swell of 0.3m and 14s. 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 3.0m 8s and forecast to arrive on Thursday (Jun 11) at 4PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 2s period and expected on Saturday (Jun 06) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1PM (Sat 6th Jun) | 4.5ft (1.4m) 9s |
| Best Surf | 1PM (Sat 6th Jun) | 4.5ft (1.4m) 9s |
| Most Powerful | 4PM (Thu 11th Jun) | 10ft (3.0m) 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 ForecastLight rain (total 6mm), mostly falling on Fri night. Very mild (max 14°C on Thu afternoon, min 10°C on Thu night). Winds increasing (light winds from the N on Sat morning, fresh winds from the SSW by Sun morning). | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Sun night. Very mild (max 14°C on Sun afternoon, min 11°C on Sun night). Winds decreasing (strong winds from the SSW on Sun afternoon, light winds from the WSW by Wed morning). | ||||||||||||||||||||
Thu 4 | Friday 5 | Saturday 6 | Sunday 7 | Monday 8 | Tuesday 9 | Wednesday 10 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | WSW 5 | SW 13 | SW 7 | SSW 4 | SSW 6 | SSW 9 | SSW 10 | SW 10 | SSW 6 | SSW 7 | SW 7 | SSW 7 | SSW 7 | SW 6 | WSW 5 | SW 6 | SW 6 | SW 6 | SSW 4 | SSW 5 | SSW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 156 | 108 | 86 | 31 | 63 | 446 | 307 | 213 | 171 | 459 | 295 | 90 | 61 | 65 | 63 | 39 | 37 | 38 | 19 | 133 | 577 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | cross-on | cross | cross-off | cross | on | cross-on | cross-on | on | cross | on | cross-on | cross-on | on | cross-on | on | cross-on | cross-on | cross-on |
High Tide | 1:52AM5.08m | 2:21PM4.63m | 2:34AM4.96m | 3:06PM4.51m | 3:20AM4.84m | 3:57PM4.42m | 4:12AM4.75m | 4:55PM4.39m | 5:10AM4.71m | 5:58PM4.44m | 6:13AM4.75m | 7:00PM4.57m | 7:15AM4.87m | ||||||||
Low Tide | 7:39PM1.61m | 8:08AM1.43m | 8:19PM1.75m | 8:51AM1.52m | 9:05PM1.87m | 9:40AM1.58m | 9:58PM1.96m | 10:35AM1.61m | 10:57PM1.99m | 11:35AM1.57m | 00:01AM1.93m | 12:37PM1.47m | 1:05AM1.76m | ||||||||
 |  |  |  |  |  | |  | | | | | | | | | | | |  | | |
 | — | — | 4:54 | — | — | 4:54 | — | — | 4:52 | — | — | 4:52 | — | — | 4:52 | — | — | 4:50 | — | — | 4:50 |
 | — | 9:37 | — | — | 9:38 | — | — | 9:39 | — | — | 9:40 | — | — | 9:42 | — | — | 9:43 | — | — | 9:44 | 9:45 |
mm | 2 | 1 | — | — | 3 | — | — | — | — | — | 5 | — | — | 1 | — | — | — | — | — | 20 | 1 |
Temp °C | 14 | 12 | 12 | 12 | 12 | 14 | 14 | 13 | 13 | 14 | 13 | 12 | 13 | 13 | 11 | 13 | 13 | 12 | 14 | 14 | 14 |
Feels °C | 7 | 5 | 6 | 6 | 6 | 12 | 11 | 10 | 7 | 6 | 5 | 8 | 7 | 8 | 6 | 8 | 10 | 9 | 11 | 7 | 6 |
Swell 1 Height (m) Direction Period (s) | — | SW 6 | WNW 5 | WNW 4 | SSW 6 | SSW 9 | SSW 10 | — | — | — | SW 13 | SSW 7 | WNW 3 | SW 12 | — | WNW 4 | SW 6 | NW 4 | NW 4 | — | — |
| kJ | — | 58 | 14 | 1 | 63 | 446 | 307 | — | — | — | 6 | 90 | 1 | 6 | — | 6 | 37 | 4 | 1 | — | — |
Swell 2 Height (m) Direction Period (s) | — | SW 13 | NNW 5 | SW 13 | SW 13 | — | SW 14 | — | — | — | — | SW 12 | SW 13 | — | — | — | — | — | — | — | — |
| kJ | — | 108 | 6 | 7 | 7 | — | 184 | — | — | — | — | 6 | 6 | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | SW 13 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | 28 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WSW 5 | WNW 5 | SW 7 | SSW 4 | SE 3 | ENE 5 | NE 4 | SW 10 | SSW 6 | SSW 7 | SW 7 | NW 4 | SSW 7 | SW 6 | WSW 5 | SW 6 | WNW 3 | SW 6 | SSW 4 | SSW 5 | SSW 7 |
| kJ | 156 | 92 | 86 | 31 | 7 | 3 | 3 | 213 | 171 | 459 | 295 | 7 | 61 | 65 | 63 | 39 | 3 | 38 | 19 | 133 | 577 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 399 | 101 | 174 | 246 | 249 | 59 | 101 | 246 | 250 | 246 | 234 | 88 | 235 | 246 | 556 | 326 | 51 | 186 | 186 | 249 | 275 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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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