Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 2 Sep 2026:
- Most powerful swell: Thursday 10 Sep, 1AM (local time) - 7.5ft (2.3m), 7s period, SW swell with 498 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 2.3m 7s and forecast to arrive on Thursday (Sep 10) at 1AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 6s period and expected on Tuesday (Sep 08) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Thu 10th Sep) | 7.5ft (2.3m) 7s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's be straight with you – this is a tough stretch for Trearddur Bay (Holy Island). We've got a long, bleak run ahead.
The next week and a half is pretty much a write-off. From Wednesday the 2nd right through to Tuesday the 8th, it's all onshore muck, strong winds, and messy, choppy surf. Don't even bother looking at it. Swell energy is weak to moderate – the highest we see is a combined energy of (292) early on the 8th, but with a 28 mph cross-onshore, that 7 ft swell is just a blown-out mess. The water temp is about average for late summer, sitting at 62° (a touch warmer than normal), but you won't be enjoying it in those conditions.
Finally, a flicker of hope arrives on Thursday the 10th. The wind swings to a light offshore from the NNE at 9 mph, giving us clean, smooth conditions. The swell drops a bit to 5 ft from the SW with a period of 7 seconds, but it's rideable. Combined energy (239) has some push to it. This is the best we're going to get. If you're a beginner, this 5 ft swell could be a bit of a handful, but for the rest of you, get on it. It won't be classic, but it'll be clean.
After that morning, the wind starts to go onshore again by the afternoon, and then we're back into tiny, weak slop for the rest of the period. Friday the 11th onward is all knee-high dribble, with winds swinging all over the place. There's nothing else worth paddling out for for the rest of the 16-day window.
So, save your energy for that Thursday morning session. It's the only real stand-out, and it's an honest one despite the average swell period.
Rusty.
Short Range ForecastModerate rain (total 17mm), heaviest on Thu night. Very mild (max 18°C on Wed night, min 13°C on Fri night). Winds decreasing (strong winds from the WSW on Fri morning, light winds from the WSW by Sat morning). | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Mon afternoon. Warm (max 20°C on Sun afternoon, min 13°C on Mon night). Winds increasing (light winds from the SSE on Sat night, strong winds from the W by Tue morning). | |||||||||||||||||||
Wed 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | ||||||||||||||
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 | SW 7 | SW 7 | SW 6 | SSW 7 | W 5 | SW 5 | WNW 5 | SW 6 | SSW 3 | SSW 4 | SSW 5 | SSW 6 | SSW 6 | SW 5 | SW 6 | WSW 6 | W 6 | W 6 | W 6 |
Wave Graph  | ||||||||||||||||||||
 kJ | 154 | 244 | 147 | 154 | 145 | 119 | 102 | 46 | 23 | 10 | 18 | 51 | 164 | 72 | 54 | 136 | 350 | 292 | 178 | 180 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on |
High Tide | 2:36AM5.34m | 3:01PM5.01m | 3:30AM5.02m | 3:59PM4.75m | 4:41AM4.69m | 5:21PM4.55m | 6:18AM4.51m | 7:01PM4.59m | 7:54AM4.65m | 8:23PM4.91m | 9:02AM4.96m | 9:21PM5.29m | ||||||||
Low Tide | 8:25PM1.22m | 8:51AM1.28m | 9:16PM1.51m | 9:47AM1.66m | 10:23PM1.82m | 10:59AM2.01m | 11:50PM1.99m | 12:31PM2.14m | 1:25AM1.84m | 1:57PM1.96m | 2:38AM1.44m | 3:00PM1.61m | 3:33AM1.02m | |||||||
 |  | |  |  | | |  | | | |  | | | | | |  | | | |
 | — | — | 6:30 | — | — | 6:31 | — | — | 6:33 | — | — | 6:35 | — | — | 6:37 | — | — | 6:39 | — | — |
 | 8:06 | — | — | 8:04 | — | — | 8:01 | — | — | 7:59 | — | — | 7:57 | — | — | 7:53 | — | — | 7:52 | — |
mm | — | — | — | 3 | 14 | — | — | — | — | — | — | — | — | — | — | 3 | — | — | — | — |
Temp °C | 17 | 18 | 17 | 18 | 16 | 15 | 17 | 16 | 14 | 15 | 16 | 19 | 20 | 18 | 15 | 16 | 14 | 14 | 15 | 14 |
Feels °C | 13 | 14 | 13 | 13 | 11 | 8 | 11 | 10 | 11 | 11 | 12 | 12 | 14 | 13 | 11 | 8 | 6 | 5 | 7 | 6 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 15 | SW 14 | — | NW 4 | SW 14 | SW 14 | SW 6 | NW 5 | NNW 4 | SW 13 | SW 13 | SW 13 | SSW 6 | NW 4 | — | — | — | — | S 11 |
| kJ | 10 | 9 | 8 | — | 4 | 8 | 8 | 45 | 13 | 2 | 7 | 7 | 6 | 72 | 4 | — | — | — | — | 2 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | SW 14 | — | SW 14 | SW 14 | SW 6 | NW 4 | — | — | — | SW 12 | SW 12 | — | — | — | — | — |
| kJ | — | — | — | — | 8 | — | 8 | 8 | 23 | 1 | — | — | — | 6 | 24 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | SW 14 | SW 14 | SW 13 | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | 8 | 7 | 7 | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 6 | SW 7 | SW 7 | SW 6 | SSW 7 | W 5 | SW 5 | WNW 5 | — | SSW 3 | SSW 4 | SSW 5 | SSW 6 | WNW 4 | SW 5 | SW 6 | WSW 6 | W 6 | W 6 | W 6 |
| kJ | 154 | 244 | 147 | 154 | 145 | 119 | 102 | 46 | — | 10 | 18 | 51 | 164 | 23 | 54 | 136 | 350 | 292 | 178 | 180 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 252 | 280 | 275 | 503 | 280 | 348 | 280 | 179 | 51 | 246 | 179 | 238 | 292 | 305 | 174 | 590 | 584 | 280 | 604 | 514 |
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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