Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 23 Sep 2026:
- Best quality surf: Wednesday 30 Sep, 4AM (local time) - 4.5ft (1.4m), 9s period, SSW swell with cross-offshore winds.
- Most powerful swell: Wednesday 30 Sep, 10AM (local time) - 5ft (1.6m), 12s period, SSW swell with 746 kJ wave energy.
- Next surfable swell (1★+): Wednesday 30 Sep, 1AM (local time) - 3.5ft (1.0m), 6s 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 Wednesday (Sep 30) at 1AM. The primary swell is predicted to be 1.0m and 6s period with a secondary swell of 0.4m and 4s. 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 1.6m 12s and forecast to arrive on Wednesday (Sep 30) at 10AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 5s period and expected on Wednesday (Sep 23) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 1AM (Wed 30th Sep) | 3.5ft (1.0m) 6s |
| Best Surf | 4AM (Wed 30th Sep) | 4.5ft (1.4m) 9s |
| Most Powerful | 10AM (Wed 30th Sep) | 5ft (1.6m) 12s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
Short Range ForecastLight rain (total 5mm), mostly falling on Wed morning. Very mild (max 16°C on Thu afternoon, min 10°C on Fri night). Winds increasing (light winds from the ENE on Wed night, fresh winds from the S by Thu morning). | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Sun afternoon. Very mild (max 16°C on Sun afternoon, min 14°C on Sat morning). Winds decreasing (strong winds from the S on Sun morning, light winds from the WSW by Sun night). | ||||||||||||||||||||
Wednesday 23 | Thursday 24 | Friday 25 | Saturday 26 | Sunday 27 | Monday 28 | Tuesday 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 15 | SW 12 | SW 4 | S 4 | SSW 5 | SSW 5 | SW 4 | SW 16 | SW 14 | SW 3 | SW 4 | SW 5 | SSW 6 | SSW 7 | SW 6 | SW 5 | SW 5 | SW 5 | SW 5 | SSE 5 | SSW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 8 | 6 | 1 | 18 | 67 | 37 | 10 | 10 | 8 | 3 | 10 | 106 | 320 | 403 | 73 | 43 | 69 | 38 | 6 | 36 | 85 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-on | cross-on | cross-on | cross-off | cross-off | cross | on | on | cross-on | cross-on | cross-on | on | on | cross-on | cross-off | cross-off | cross-off | cross-off |
High Tide | 9:25PM5.08m | 9:54AM4.96m | 9:59PM5.36m | 10:24AM5.19m | 10:31PM5.59m | 10:54AM5.39m | 11:03PM5.76m | 11:25AM5.54m | 11:36PM5.87m | 11:57AM5.63m | 00:12AM5.89m | 12:32PM5.64m | 00:50AM5.80m | ||||||||
Low Tide | 3:15PM1.89m | 3:38AM1.45m | 3:49PM1.55m | 4:10AM1.13m | 4:20PM1.24m | 4:40AM0.87m | 4:52PM0.99m | 5:12AM0.69m | 5:26PM0.82m | 5:46AM0.60m | 6:01PM0.74m | 6:21AM0.63m | 6:39PM0.78m | ||||||||
 |  |  | | |  |  |  | | | |  | | | |  | |  | | | | |
 | 7:03 | — | — | 7:05 | — | — | 7:07 | — | — | 7:09 | — | — | 7:11 | — | — | 7:13 | — | — | 7:15 | — | — |
 | — | 7:15 | — | — | 7:13 | — | — | 7:10 | — | — | 7:07 | — | — | 7:06 | — | — | 7:02 | — | — | 7:00 | — |
mm | 1 | — | — | — | — | 1 | — | 2 | 1 | — | — | — | — | 2 | 4 | — | — | — | — | 5 | 5 |
Temp °C | 13 | 14 | 13 | 14 | 16 | 16 | 12 | 11 | 13 | 15 | 15 | 15 | 15 | 16 | 15 | 14 | 15 | 15 | 19 | 21 | 19 |
Feels °C | 7 | 11 | 12 | 7 | 11 | 13 | 9 | 7 | 8 | 10 | 10 | 10 | 7 | 9 | 11 | 9 | 10 | 11 | 15 | 18 | 18 |
Swell 1 Height (m) Direction Period (s) | SW 4 | SSW 4 | NNW 4 | — | — | — | SW 4 | SSW 4 | SW 4 | — | S 14 | S 14 | — | — | SW 13 | SW 12 | SW 12 | SW 5 | SW 5 | NE 5 | SSW 6 |
| kJ | 2 | 2 | 6 | — | — | — | 9 | 2 | 1 | — | 4 | 4 | — | — | 7 | 6 | 6 | 38 | 6 | 4 | 85 |
Swell 2 Height (m) Direction Period (s) | SW 15 | SW 12 | SW 4 | — | — | — | SW 16 | SW 16 | SW 9 | — | — | — | — | — | — | — | — | SW 12 | SW 12 | SW 6 | NE 5 |
| kJ | 8 | 6 | 1 | — | — | — | 10 | 10 | 3 | — | — | — | — | — | — | — | — | 6 | 6 | 1 | 1 |
Swell 3 Height (m) Direction Period (s) | SW 12 | S 12 | — | — | — | — | — | — | SW 14 | — | — | — | — | — | — | — | — | — | — | S 12 | — |
| kJ | 6 | 3 | — | — | — | — | — | — | 8 | — | — | — | — | — | — | — | — | — | — | 3 | — |
Wind waves Height (m) Direction Period (s) | NNW 4 | NNW 5 | — | S 4 | SSW 5 | SSW 5 | NW 3 | — | — | SW 3 | SW 4 | SW 5 | SSW 6 | SSW 7 | SW 6 | SW 5 | SW 5 | — | ESE 4 | SSE 5 | SE 4 |
| kJ | 20 | 33 | — | 18 | 67 | 37 | 1 | — | — | 3 | 10 | 106 | 320 | 403 | 73 | 43 | 69 | — | 21 | 36 | 6 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 179 | 192 | 163 | 235 | 189 | 238 | 163 | 174 | 179 | 179 | 246 | 186 | 290 | 246 | 114 | 125 | 198 | 161 | 252 | 299 | 0 |
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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