Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 18 Oct 2026:
- Most powerful swell: Wednesday 21 Oct, 1PM (local time) - 13ft (4.0m), 8s period, W swell with 2,281 kJ wave energy.
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 4.0m 8s and forecast to arrive on Wednesday (Oct 21) 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 1.8m 6s period and expected on Friday (Oct 23) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Wed 21st Oct) | 13ft (4.0m) 8s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
Short Range ForecastModerate rain (total 16mm), heaviest on Tue night. Very mild (max 13°C on Mon afternoon, min 9°C on Mon night). Winds increasing (light winds from the SSE on Tue morning, near gales from the W by Wed morning). | Days 5-7 Weather SummaryModerate rain (total 12mm), heaviest on Thu night. Very mild (max 13°C on Thu afternoon, min 9°C on Fri morning). Winds increasing (moderate winds from the NNW on Thu night, near gales from the W by Fri night). | |||||||||||||||||||
Sun 18 | Monday 19 | Tuesday 20 | Wednesday 21 | Thursday 22 | Friday 23 | Saturday 24 | ||||||||||||||
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) | NE 2 | NE 3 | NE 4 | NE 5 | S 4 | SSW 6 | SSW 4 | SSW 5 | WSW 8 | W 8 | WSW 6 | WSW 6 | SW 6 | SSW 8 | NW 6 | WSW 6 | WNW 7 | WSW 6 | SW 6 | SW 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 0 | 0 | 0 | 0 | 8 | 4 | 4 | 94 | 1276 | 1606 | 175 | 268 | 175 | 143 | 282 | 461 | 726 | 272 | 169 | 1014 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | cross | cross | cross-off | cross-on | cross | cross-on | cross-on | on | cross-on | on | cross-off | cross-on | cross-on | cross-on | cross | cross-on | cross-on |
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 | ||||||||
 |  | |  | |  |  |  | | | | | |  | | | |  | |  | |
 | — | — | 7:50 | — | — | 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 | — | — | — | — | — | 3 | 2 | 8 | 3 | — | 2 | — | 2 | 4 | 1 | 1 | 2 | — | — | — |
Temp °C | 11 | 11 | 12 | 13 | 12 | 9 | 11 | 11 | 10 | 11 | 11 | 12 | 13 | 12 | 10 | 10 | 10 | 10 | 11 | 12 |
Feels °C | 7 | 6 | 8 | 8 | 8 | 7 | 7 | 6 | -3 | -1 | 4 | 4 | 5 | 6 | 2 | -1 | -1 | 1 | 6 | 5 |
Swell 1 Height (m) Direction Period (s) | — | — | — | N 4 | — | SSW 4 | SSW 4 | — | — | — | — | — | NW 5 | SSW 8 | SSW 9 | — | — | NW 6 | NNW 6 | — |
| kJ | — | — | — | 3 | — | 4 | 4 | — | — | — | — | — | 5 | 143 | 65 | — | — | 20 | 3 | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | NE 5 | W 11 | SSW 6 | W 8 | — | — | — | — | — | — | WNW 3 | — | — | — | — | — | — |
| kJ | — | — | — | 3 | 2 | 4 | 1 | — | — | — | — | — | — | 2 | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | W 11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NE 2 | NE 3 | NE 4 | ESE 2 | S 4 | — | — | SSW 5 | WSW 8 | W 8 | WSW 6 | WSW 6 | SW 6 | NNE 2 | NW 6 | WSW 6 | WNW 7 | WSW 6 | SW 6 | SW 8 |
| kJ | 1 | 6 | 24 | 1 | 8 | — | — | 94 | 1276 | 1606 | 175 | 268 | 175 | 2 | 282 | 461 | 726 | 272 | 169 | 1014 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 246 | 246 | 189 | 249 | 179 | 163 | 186 | 238 | 246 | 284 | 251 | 251 | 319 | 50 | 246 | 567 | 280 | 280 | 179 | 259 |
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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