Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 9 Oct 2026:
- Most powerful swell: Thursday 15 Oct, 1AM (local time) - 11ft (3.5m), 8s period, SW swell with 1,505 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 3.5m 8s and forecast to arrive on Thursday (Oct 15) at 1AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 6s period and expected on Sunday (Oct 11) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Thu 15th Oct) | 11ft (3.5m) 8s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
Short Range ForecastLight rain (total 6mm), mostly falling on Fri morning. Very mild (max 16°C on Fri morning, min 11°C on Sat night). Winds decreasing (strong winds from the WNW on Fri night, light winds from the SW by Sat night). | Days 4-6 Weather SummaryModerate rain (total 18mm), heaviest on Wed night. Very mild (max 17°C on Mon night, min 14°C on Tue morning). Winds increasing (moderate winds from the WSW on Tue night, near gales from the SSW by Wed night). | ||||||||||||||||||||
Friday 9 | Saturday 10 | Sunday 11 | Monday 12 | Tuesday 13 | Wednesday 14 | Thursday 15 | |||||||||||||||
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) | SW 7 | W 6 | W 6 | WNW 6 | NW 6 | SW 5 | SW 6 | S 4 | S 7 | SSW 7 | SSW 5 | SSW 7 | SW 7 | SW 6 | SW 7 | SW 7 | SW 8 | SW 8 | SW 8 | WSW 4 | W 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 479 | 228 | 328 | 359 | 237 | 14 | 5 | 18 | 297 | 157 | 91 | 837 | 336 | 259 | 167 | 467 | 1035 | 1505 | 226 | 61 | 73 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-on | cross | cross | cross-on | cross-on | cross-on | cross-on | on | on | cross-on | cross-on | cross-on | cross-off | cross | cross |
High Tide | 10:15AM5.45m | 10:28PM5.77m | 10:50AM5.55m | 11:04PM5.80m | 11:23AM5.58m | 11:38PM5.73m | 11:56AM5.56m | 00:12AM5.60m | 12:28PM5.49m | 00:45AM5.41m | 1:02PM5.36m | 1:20AM5.17m | 1:37PM5.19m | 1:57AM4.90m | |||||||
Low Tide | 4:11PM1.06m | 4:37AM0.68m | 4:48PM0.91m | 5:13AM0.68m | 5:24PM0.86m | 5:47AM0.78m | 5:59PM0.92m | 6:21AM0.96m | 6:35PM1.07m | 6:55AM1.21m | 7:10PM1.30m | 7:29AM1.51m | 7:48PM1.58m | ||||||||
 |  |  | | |  |  |  |  | |  |  | | | | | |  | | | | |
 | 7:33 | — | — | 7:33 | — | — | 7:35 | — | — | 7:37 | — | — | 7:39 | — | — | 7:41 | — | — | 7:43 | — | — |
 | — | 6:37 | — | — | 6:35 | — | — | 6:32 | — | — | 6:30 | — | — | 6:28 | — | — | 6:25 | — | — | 6:22 | — |
mm | 2 | — | — | 1 | 1 | — | — | 1 | 1 | 1 | — | 5 | — | — | — | — | — | 12 | 6 | — | 3 |
Temp °C | 16 | 14 | 12 | 12 | 13 | 12 | 12 | 13 | 15 | 16 | 16 | 17 | 14 | 15 | 14 | 15 | 15 | 15 | 11 | 12 | 11 |
Feels °C | 9 | 5 | 3 | 3 | 4 | 5 | 8 | 7 | 10 | 12 | 11 | 11 | 8 | 9 | 9 | 5 | 5 | 4 | 3 | 4 | 3 |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | — | SW 5 | NNW 4 | NNW 4 | SW 7 | WSW 13 | WSW 12 | — | — | — | NW 4 | — | — | — | SW 8 | — | SW 7 |
| kJ | — | — | — | — | — | 14 | 6 | 2 | 106 | 17 | 15 | — | — | — | 1 | — | — | — | 226 | — | 25 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | SW 6 | — | — | — | WSW 12 | — | — | — | NW 4 | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | 5 | — | — | — | 26 | — | — | — | 1 | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | WNW 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 7 | W 6 | W 6 | WNW 6 | NW 6 | NW 6 | — | S 4 | S 7 | SSW 7 | SSW 5 | SSW 7 | SW 7 | SW 6 | SW 7 | SW 7 | SW 8 | SW 8 | WNW 4 | WSW 4 | W 5 |
| kJ | 479 | 228 | 328 | 359 | 237 | 86 | — | 18 | 297 | 157 | 91 | 837 | 336 | 259 | 167 | 467 | 1035 | 1505 | 19 | 61 | 73 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1080 | 611 | 548 | 556 | 376 | 192 | 246 | 249 | 275 | 59 | 114 | 297 | 438 | 306 | 114 | 319 | 444 | 234 | 174 | 476 | 350 |
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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