Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 8 Sep 2026:
- Most powerful swell: Saturday 12 Sep, 7PM (local time) - 6ft (1.9m), 6s period, SSW swell with 279 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 1.9m 6s and forecast to arrive on Saturday (Sep 12) at 7PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Wednesday (Sep 09) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Sat 12th Sep) | 6ft (1.9m) 6s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s break down the surf for Trearddur Bay (Holy Island) over the next couple of weeks.
Honestly, it’s a tough stretch. The first week is mostly a waste of time. We’ve got swell in the 3ft to 6ft range on and off, but the wind is blowing onshore or cross-onshore most of the time, making everything lumpy and messy. The water is sitting at 62°F and is a touch warmer than normal for the season, which is fine, but the waves are just not clean.
The only real glimmer of hope comes on Thursday, 17th September. The swell is tiny, only about 1ft from the SSE, but the wind goes glassy in the afternoon and is cross-offshore in the morning. That’s as clean as it gets around here. The combined energy is weak, but for a beginner-friendly spot, the lack of wind and chop means you could score a few little fun waves.
Other than that, there’s a big gap of about a week where nothing is really worth your time. The 22nd has a bit more swell, 4ft from the SW, but with a strong breeze, it’s just messy again.
So, if you’re keen, mark the 17th for a clean, glassy session on tiny waves. For the rest of it, it’s a hard pass.
Rusty.
Short Range ForecastLight rain (total 8mm), mostly falling on Mon night. Very mild (max 16°C on Mon afternoon, min 13°C on Mon night). Winds decreasing (strong winds from the SSW on Mon afternoon, light winds from the SW by Wed afternoon). | Days 5-7 Weather SummaryLight rain (total 5mm), mostly falling on Thu afternoon. Very mild (max 17°C on Thu night, min 14°C on Thu night). Winds increasing (calm on Fri afternoon, strong winds from the SSW by Sat morning). | |||||||||||||||||||
Mon 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | ||||||||||||||
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 5 | SW 7 | W 5 | WNW 5 | SW 6 | SW 8 | SW 7 | SSW 4 | SW 5 | SSW 6 | SW 6 | SSW 6 | SW 6 | SW 6 | SSW 4 | SSW 6 | SW 6 | SW 6 | SW 6 | SW 6 |
Wave Graph  | ||||||||||||||||||||
 kJ | 133 | 292 | 120 | 138 | 9 | 15 | 14 | 18 | 51 | 160 | 139 | 28 | 20 | 9 | 38 | 211 | 156 | 45 | 18 | 8 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | cross-on | cross | cross | on | cross-on | cross-on | on | cross-on | cross | cross | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on |
High Tide | 8:23PM4.91m | 9:02AM4.96m | 9:21PM5.29m | 9:53AM5.26m | 10:08PM5.63m | 10:36AM5.47m | 10:49PM5.85m | 11:14AM5.59m | 11:28PM5.95m | 11:50AM5.61m | 00:04AM5.91m | 12:25PM5.56m | 00:40AM5.77m | |||||||
Low Tide | 2:38AM1.44m | 3:00PM1.61m | 3:33AM1.02m | 3:50PM1.24m | 4:19AM0.68m | 4:32PM0.95m | 5:00AM0.47m | 5:11PM0.75m | 5:39AM0.42m | 5:49PM0.68m | 6:16AM0.50m | 6:26PM0.74m | ||||||||
 |  |  |  |  | | |  | |  | | | | | | | | | | | |
 | — | — | 6:39 | — | — | 6:39 | — | — | 6:41 | — | — | 6:43 | — | — | 6:45 | — | — | 6:47 | — | — |
 | 7:53 | — | — | 7:52 | — | — | 7:50 | — | — | 7:46 | — | — | 7:45 | — | — | 7:42 | — | — | 7:39 | — |
mm | 3 | 5 | — | — | — | — | — | — | — | 1 | 1 | — | — | — | 1 | 1 | 1 | — | — | — |
Temp °C | 16 | 15 | 14 | 16 | 14 | 13 | 14 | 15 | 16 | 16 | 17 | 14 | 15 | 14 | 15 | 16 | 17 | 14 | 15 | 16 |
Feels °C | 9 | 11 | 6 | 8 | 7 | 8 | 11 | 10 | 9 | 9 | 14 | 10 | 12 | 12 | 7 | 10 | 12 | 8 | 12 | 11 |
Swell 1 Height (m) Direction Period (s) | — | SW 12 | SW 12 | SW 11 | SW 6 | SW 8 | N 5 | N 4 | — | — | SW 6 | SSW 6 | SW 6 | SW 6 | — | — | — | SW 6 | SW 6 | SW 6 |
| kJ | — | 6 | 5 | 5 | 9 | 15 | 19 | 1 | — | — | 139 | 28 | 20 | 9 | — | — | — | 45 | 18 | 8 |
Swell 2 Height (m) Direction Period (s) | — | — | SW 11 | SW 10 | SW 11 | NW 5 | SW 7 | — | — | — | — | — | — | N 4 | — | — | — | SW 7 | — | NNW 5 |
| kJ | — | — | 5 | 4 | 4 | 4 | 14 | — | — | — | — | — | — | 1 | — | — | — | 12 | — | 4 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | WNW 4 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 5 | SW 7 | W 5 | WNW 5 | NNW 6 | NNW 6 | W 3 | SSW 4 | SW 5 | SSW 6 | — | NW 4 | NNW 4 | — | SSW 4 | SSW 6 | SW 6 | NW 5 | NNW 4 | — |
| kJ | 133 | 292 | 120 | 138 | 189 | 74 | 1 | 18 | 51 | 160 | — | 21 | 11 | — | 38 | 211 | 156 | 32 | 11 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 326 | 280 | 179 | 548 | 179 | 187 | 51 | 238 | 281 | 250 | 51 | 179 | 192 | 163 | 299 | 253 | 280 | 307 | 179 | 246 |
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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