Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 28 Aug 2026:
- Most powerful swell: Thursday 3 Sep, 1PM (local time) - 7ft (2.1m), 7s period, SW swell with 397 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 2.1m 7s and forecast to arrive on Thursday (Sep 03) 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 0.6m 4s period and expected on Saturday (Aug 29) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Thu 3rd Sep) | 7ft (2.1m) 7s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Right then, let’s have a look at what’s on offer for this corner of the region.
Honestly, it’s a quiet picture for the next 16 days at Trearddur Bay (Holy Island). The opening Friday 28 August morning sets the tone: just 1ft of weak, short-period SSW windswell with a cross-onshore breeze and poor conditions – not worth getting wet for. That pattern sticks through the weekend. Saturday 29 August sees a cleaner moment with an ESE cross-offshore in the morning, and the swell lifts to 3ft, but the energy is still low and the wave quality is poor. Saturday afternoon turns clean again with a NE offshore but drops back to 2ft. It’s frustrating – the right wind direction but no real push in the water.
Sunday 30 August turns ugly: onshore winds build, and by the afternoon the swell climbs to 4ft but it’s lumpy and choppy with a strong cross-on. The week ahead does see a pulse of swell energy arrive from the 31st through to 3 September. Monday 31 August shows a combined energy reading of 162 (moderate), but the wind is cross-on and fresh, making it messy all day. That energy builds further by Thursday 3 September when the combined energy hits 313 (strong) and swell heights push 6ft, but the wind is howling from the SSW at 28 mph – it’s onshore and messy, and the break is fairly exposed. At that size and with that wind, it’s more of a kite-surfing setup than paddle surfing.
There’s a small glimmer on Sunday 6 September: the afternoon swell reaches 6ft with a combined energy of 211 (moderate-to-strong) and the wind drops to just 3 mph – almost glassy. But it’s a cross-on, and the break is inconsistent by nature, so you’d need a bit of patience. The period is only 6 seconds, so it’s windswell without much shape. Still, that Sunday afternoon is about as good as it gets.
After the 7th, the swells fade and the energy drops back to weak numbers. By the 10th of September, there’s no recorded swell at all, and the 11th and 12th show zero wave energy. So from around the 8th onward, it’s a real blank run – a week or more with nothing to recommend, which is pretty normal for this area when the charts are quiet.
If you’re a beginner and just want to bob around, the cleanest chances are Saturday 29 August morning or the light wind window on Sunday 6 September afternoon. For anyone looking for proper waves, this 16-day stretch is a wipeout.
Rusty.
Short Range ForecastModerate rain (total 12mm), heaviest on Sat morning. Very mild (max 18°C on Sun morning, min 15°C on Sat night). Mainly fresh winds. | Days 4-6 Weather SummaryModerate rain (total 10mm), heaviest on Wed morning. Very mild (max 19°C on Wed night, min 14°C on Tue morning). Winds increasing (light winds from the SW on Mon afternoon, fresh winds from the SSW by Wed morning). | ||||||||||||||||||||
Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | |||||||||||||||
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) | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 9 | SSW 8 | SSW 5 | SSW 7 | SW 8 | SW 8 | SW 4 | WNW 4 | SW 6 | SW 6 | SW 3 | SSW 6 | SW 7 | SW 6 | SW 7 | SW 7 |
Wave Graph | |||||||||||||||||||||
16 | 16 | 41 | 60 | 20 | 157 | 48 | 48 | 105 | 88 | 77 | 18 | 32 | 20 | 9 | 10 | 190 | 100 | 236 | 305 | 121 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | cross-off | off | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | on | on | on | on | on | cross-on | on | cross-on |
High Tide | 11:27AM5.23m | 11:36PM5.65m | 11:57AM5.33m | 00:07AM5.72m | 12:28PM5.40m | 00:40AM5.74m | 1:01PM5.41m | 1:15AM5.69m | 1:36PM5.36m | 1:53AM5.56m | 2:15PM5.23m | 2:36AM5.34m | 3:01PM5.01m | 3:30AM5.02m | |||||||
Low Tide | 5:23PM1.07m | 5:44AM0.80m | 5:55PM0.94m | 6:16AM0.70m | 6:28PM0.87m | 6:50AM0.69m | 7:04PM0.89m | 7:26AM0.78m | 7:42PM1.01m | 8:06AM0.98m | 8:25PM1.22m | 8:51AM1.28m | 9:16PM1.51m | ||||||||
6:20 | — | — | 6:20 | — | — | 6:22 | — | — | 6:24 | — | — | 6:26 | — | — | 6:28 | — | — | 6:30 | — | — | |
— | 8:17 | — | — | 8:15 | — | — | 8:13 | — | — | 8:10 | — | — | 8:08 | — | — | 8:06 | — | — | 8:04 | — | |
mm | 2 | — | — | 4 | — | 1 | 1 | 4 | — | — | — | — | — | — | 3 | 4 | 2 | 1 | — | — | 1 |
Temp °C | 16 | 17 | 17 | 16 | 16 | 15 | 18 | 16 | 16 | 15 | 17 | 17 | 14 | 16 | 17 | 15 | 18 | 19 | 16 | 17 | 18 |
Feels °C | 15 | 15 | 15 | 15 | 14 | 13 | 14 | 12 | 13 | 10 | 15 | 14 | 10 | 12 | 14 | 11 | 16 | 17 | 10 | 10 | 12 |
Swell 1 Height (m) Direction Period (s) | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 9 | SSW 8 | — | SSW 7 | SW 8 | SW 8 | NNW 4 | SW 5 | SW 6 | SW 6 | NNW 4 | SW 16 | SW 15 | — | SW 14 | SW 7 |
16 | 16 | 41 | 60 | 20 | 157 | 48 | — | 105 | 88 | 48 | 2 | 22 | 17 | 9 | 2 | 10 | 9 | — | 8 | 121 | |
Swell 2 Height (m) Direction Period (s) | S 12 | N 3 | — | — | — | NW 4 | WNW 3 | — | — | — | SW 8 | — | — | — | NNW 4 | S 16 | — | — | — | — | SW 14 |
3 | 2 | — | — | — | 3 | 1 | — | — | — | 77 | — | — | — | 4 | 5 | — | — | — | — | 8 | |
Swell 3 Height (m) Direction Period (s) | S 12 | S 11 | S 11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 14 |
3 | 3 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 8 | |
Wind waves Height (m) Direction Period (s) | NNW 3 | — | — | — | — | — | SSW 3 | SSW 5 | — | WNW 5 | NW 4 | SW 4 | WNW 4 | NW 4 | — | SW 3 | SSW 6 | SW 7 | SW 6 | SW 7 | WNW 4 |
1 | — | — | — | — | — | 4 | 48 | — | 74 | 24 | 18 | 32 | 20 | — | 10 | 190 | 100 | 236 | 305 | 12 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 280 | 283 | 280 | 8 | 179 | 51 | 255 | 275 | 51 | 306 | 51 | 179 | 323 | 285 | 235 | 246 | 246 | 280 | 275 | 376 | 388 |
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.











