Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 23 Aug 2026:
- Best quality surf: Thursday 27 Aug, 7PM (local time) - 2.5ft (0.8m), 8s period, SSW swell with glassy winds.
- Most powerful swell: Saturday 29 Aug, 4AM (local time) - 7ft (2.1m), 6s period, W swell with 301 kJ wave energy.
- Next surfable swell (1★+): Thursday 27 Aug, 7PM (local time) - 2.5ft (0.8m), 8s 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 Thursday (Aug 27) at 7PM. The primary swell is predicted to be 0.8m and 8s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Trearddur Bay (Holy Island) in the next 16 days are 2.1m 6s and forecast to arrive on Saturday (Aug 29) at 4AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Tuesday (Aug 25) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7PM (Thu 27th Aug) | 2.5ft (0.8m) 8s |
| Best Surf | 7PM (Thu 27th Aug) | 2.5ft (0.8m) 8s |
| Most Powerful | 4AM (Sat 29th Aug) | 7ft (2.1m) 6s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
Short Range ForecastLight rain (total 4mm), mostly falling on Tue night. Warm (max 23°C on Tue afternoon, min 13°C on Sun morning). Winds increasing (calm on Mon morning, strong winds from the E by Tue night). | Days 4-6 Weather SummaryHeavy rain (total 20mm), heaviest during Thu morning. Warm (max 20°C on Wed afternoon, min 15°C on Wed night). Winds increasing (calm on Wed afternoon, strong winds from the W by Fri night). | ||||||||||||||||||||
Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | |||||||||||||||
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 14 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 13 | SSW 8 | SSW 8 | SSW 8 | SSW 5 | SSW 7 | SSW 7 | SSW 8 | SSW 5 | SSW 5 | W 6 | W 6 | SW 7 | WNW 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 8 | 7 | 7 | 8 | 7 | 7 | 7 | 7 | 7 | 13 | 12 | 5 | 15 | 61 | 161 | 77 | 77 | 266 | 206 | 85 | 55 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | glassy | cross-off | cross-off | cross-off | off | cross-off | cross-off | glassy | cross-off | cross-off | on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on |
High Tide | 8:27PM4.49m | 9:08AM4.41m | 9:19PM4.79m | 9:52AM4.67m | 9:59PM5.08m | 10:26AM4.89m | 10:33PM5.32m | 10:57AM5.08m | 11:04PM5.51m | 11:27AM5.23m | 11:36PM5.65m | 11:57AM5.33m | 00:07AM5.72m | ||||||||
Low Tide | 2:08PM2.34m | 2:47AM2.11m | 3:05PM2.09m | 3:35AM1.78m | 3:46PM1.80m | 4:11AM1.47m | 4:21PM1.52m | 4:43AM1.19m | 4:52PM1.28m | 5:14AM0.96m | 5:23PM1.07m | 5:44AM0.80m | 5:55PM0.94m | ||||||||
 |  |  | | |  |  | |  | |  |  | | | | |  | |  | | | |
 | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:16 | — | — | 6:18 | — | — | 6:20 | — | — | 6:20 | — | — |
 | — | 8:29 | — | — | 8:27 | — | — | 8:24 | — | — | 8:22 | — | — | 8:20 | — | — | 8:17 | — | — | 8:15 | — |
mm | — | — | — | — | — | — | — | — | 4 | — | 2 | 1 | 7 | — | — | — | 7 | 3 | 2 | 1 | 1 |
Temp °C | 14 | 15 | 17 | 18 | 19 | 20 | 20 | 23 | 20 | 19 | 20 | 19 | 18 | 18 | 17 | 16 | 15 | 16 | 15 | 17 | 17 |
Feels °C | 11 | 12 | 14 | 16 | 16 | 16 | 17 | 18 | 12 | 19 | 21 | 18 | 16 | 18 | 16 | 12 | 13 | 12 | 9 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 14 | SW 13 | SW 10 | SW 9 | SW 13 | SW 13 | SW 13 | SSW 8 | SSE 4 | SSW 8 | SSW 5 | SSW 4 | SSW 7 | — | — | — | — | — | SW 7 | SW 6 |
| kJ | 8 | 7 | 7 | 4 | 3 | 7 | 7 | 7 | 7 | 4 | 12 | 4 | 3 | 61 | — | — | — | — | — | 85 | 31 |
Swell 2 Height (m) Direction Period (s) | SW 14 | — | SW 14 | SW 14 | SW 13 | SW 9 | SW 8 | SW 8 | S 13 | NE 5 | NNE 5 | SSW 7 | SSW 7 | NE 4 | — | — | — | — | — | — | — |
| kJ | 8 | — | 7 | 8 | 7 | 3 | 3 | 3 | 3 | 4 | 2 | 5 | 5 | 1 | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | SW 14 | — | — | — | N 5 | — | — | SSW 8 | SW 6 | S 12 | NE 4 | — | — | — | — | — | — | — | — |
| kJ | — | — | 7 | — | — | — | 1 | — | — | 13 | 1 | 3 | 1 | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | N 4 | N 4 | NNE 2 | — | — | E 3 | ENE 5 | NE 5 | ENE 4 | SSE 4 | SSW 5 | NE 2 | SSW 7 | — | SSW 8 | SSW 5 | SSW 5 | W 6 | W 6 | WNW 5 | WNW 5 |
| kJ | 6 | 2 | 1 | — | — | 7 | 14 | 20 | 27 | 11 | 7 | 1 | 15 | — | 161 | 77 | 77 | 266 | 206 | 29 | 55 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 267 | 208 | 163 | 246 | 249 | 246 | 249 | 249 | 241 | 241 | 267 | 208 | 186 | 51 | 51 | 219 | 210 | 281 | 283 | 514 | 10 |
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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