Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 18 Oct 2026:
- Best quality surf: Sunday 25 Oct, 1AM (local time) - 11ft (3.5m), 10s period, SW swell with cross-offshore winds.
- Most powerful swell: Saturday 24 Oct, 7PM (local time) - 16ft (5.0m), 10s period, SW swell with 4,975 kJ wave energy.
- Next surfable swell (1★+): Sunday 25 Oct, 1AM (local time) - 11ft (3.5m), 10s period with SW 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 Sunday (Oct 25) at 1AM. The primary swell is predicted to be 3.5m and 10s period. 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 5.0m 10s and forecast to arrive on Saturday (Oct 24) at 7PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 4s period and expected on Monday (Oct 19) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Sun 25th Oct) | 11ft (3.5m) 10s |
| Best Surf | 1AM (Sun 25th Oct) | 11ft (3.5m) 10s |
| Most Powerful | 7PM (Sat 24th Oct) | 16ft (5.0m) 10s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
Short Range ForecastLight rain (total 9mm), mostly falling on Tue morning. Very mild (max 14°C on Mon afternoon, min 8°C on Sun morning). Winds increasing (calm on Tue morning, strong winds from the SSW by Tue night). | Days 4-6 Weather SummaryHeavy rain (total 29mm), heaviest during Thu night. Very mild (max 14°C on Thu night, min 8°C on Fri morning). Mainly severe gales. | ||||||||||||||||||||
Sunday 18 | Monday 19 | Tuesday 20 | Wednesday 21 | Thursday 22 | Friday 23 | Saturday 24 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | S 10 | NE 2 | NE 3 | NE 4 | SE 3 | SSE 4 | S 4 | W 11 | S 5 | WSW 8 | W 7 | SW 6 | WSW 6 | SW 6 | S 7 | NW 9 | WNW 8 | W 7 | SW 7 | SW 9 | SW 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2 | 0 | 0 | 0 | 1 | 5 | 3 | 2 | 68 | 957 | 813 | 240 | 246 | 129 | 753 | 3411 | 1311 | 736 | 458 | 2471 | 2339 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | off | off | cross | cross-off | glassy | cross-on | cross | cross-on | cross-on | on | cross-on | on | cross-off | cross | cross-on | cross-on | cross-on | cross-on | cross-off |
High Tide | 4:02PM4.51m | 4:53AM4.11m | 5:20PM4.39m | 6:32AM4.13m | 6:46PM4.48m | 7:48AM4.35m | 7:52PM4.73m | 8:36AM4.65m | 8:39PM5.03m | 9:13AM4.95m | 9:18PM5.32m | 9:46AM5.22m | 9:54PM5.57m | ||||||||
Low Tide | 10:30PM2.39m | 11:00AM2.68m | 11:58PM2.41m | 12:32PM2.63m | 1:20AM2.18m | 1:42PM2.36m | 2:14AM1.84m | 2:30PM2.01m | 2:54AM1.49m | 3:09PM1.64m | 3:30AM1.17m | 3:44PM1.31m | |||||||||
 |  |  |  | | |  |  |  | | |  | | | | | | | | | | |
 | 7:48 | — | — | 7:50 | — | — | 7:52 | — | — | 7:54 | — | — | 7:56 | — | — | 7:58 | — | — | 8:00 | — | — |
 | — | 6:16 | — | — | 6:14 | — | — | 6:12 | — | — | 6:09 | — | — | 6:07 | — | — | 6:06 | — | — | 6:02 | — |
mm | — | — | — | — | — | — | 4 | 2 | 3 | 1 | 5 | 2 | — | — | 13 | 5 | 2 | 1 | 1 | 2 | 1 |
Temp °C | 10 | 11 | 11 | 12 | 14 | 13 | 10 | 11 | 11 | 10 | 11 | 11 | 12 | 12 | 14 | 9 | 10 | 10 | 10 | 12 | 12 |
Feels °C | 6 | 6 | 6 | 8 | 11 | 10 | 9 | 6 | 5 | 4 | 0 | 3 | 5 | 5 | 5 | -6 | -4 | -5 | -4 | 0 | 2 |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | NE 5 | — | S 4 | NE 4 | SW 5 | — | — | NNW 6 | — | WNW 5 | SW 8 | SW 10 | — | — | NNW 6 | — | — |
| kJ | — | — | — | — | 4 | — | 3 | 1 | 29 | — | — | 7 | — | 8 | 318 | 328 | — | — | 8 | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | N 4 | NE 4 | S 6 | W 11 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | 1 | 1 | 1 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | S 10 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | NE 2 | NE 3 | NE 4 | SE 3 | SSE 4 | — | SSW 4 | S 5 | WSW 8 | W 7 | SW 6 | WSW 6 | SW 6 | S 7 | NW 9 | WNW 8 | W 7 | SW 7 | SW 9 | SW 10 |
| kJ | — | 1 | 6 | 37 | 1 | 5 | — | 1 | 68 | 957 | 813 | 240 | 246 | 129 | 753 | 3411 | 1311 | 736 | 458 | 2471 | 2339 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 163 | 179 | 246 | 246 | 246 | 251 | 163 | 163 | 251 | 249 | 259 | 565 | 323 | 251 | 251 | 246 | 567 | 359 | 879 | 879 | 280 |
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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