Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 1 Sep 2026:
- Most powerful swell: Tuesday 8 Sep, 1AM (local time) - 7.5ft (2.3m), 7s period, SW swell with 465 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 Tuesday (Sep 08) at 1AM. 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 5s period and expected on Saturday (Sep 05) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Tue 8th Sep) | 7.5ft (2.3m) 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 the cards for Trearddur Bay.
To be brutally honest, this is a tough stretch for a paddle. The entire 16-day window is one long gap with no solid surf on offer. The swell just isn’t cooperating, and when there is a bit of height, the wind is all over it. It’s frustrating, but it happens here. The first real sign of anything is around the 2nd of September, but don’t get your hopes up – a 5ft to 6ft swell from the SSW is completely ruined by fresh cross-onshore wind, making it lumpy and poor. Even when the swell drops right off, like on the 5th of September, you get a tiny 0.3ft swell with a very long 13-second period, but it’s still messy. The only time we see clean winds is on the 13th of September, Sunday, with a cross-off breeze from the NNW, but by then the swell height is only 2ft from the SW, and the wave energy is weak (24 and 21). It could be a glassy little session for a log, but it’s nothing to write home about. The water temp is sitting at 62°F which is a touch warmer than normal for the time of year, but you wouldn’t be in the water long enough to notice.
Honestly, if you’re desperate for a wave, the 13th of September is the only day that might offer a clean, albeit tiny, option. For anything else, the combination of onshore winds and lacklustre swell makes this a stretch best spent working on your short game or waiting for a better forecast. Take it from me, it won't stay like this forever.
Rusty
Short Range ForecastModerate rain (total 16mm), heaviest on Wed morning. Very mild (max 18°C on Tue afternoon, min 15°C on Tue morning). Winds increasing (light winds from the SW on Tue night, strong winds from the SSW by Thu afternoon). | Days 4-6 Weather SummaryMostly dry. Very mild (max 18°C on Sun afternoon, min 13°C on Fri night). Mainly fresh winds. | ||||||||||||||||||||
Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | |||||||||||||||
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 4 | SSW 5 | SSW 5 | SSW 5 | SSW 6 | SW 7 | SW 7 | SW 6 | SW 7 | WSW 5 | SW 5 | NW 5 | SW 6 | SW 5 | SW 13 | SSW 4 | SSW 5 | SSW 6 | SW 12 | SSW 4 | SW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 20 | 67 | 34 | 99 | 266 | 287 | 124 | 105 | 183 | 84 | 67 | 51 | 8 | 7 | 7 | 15 | 111 | 63 | 23 | 31 | 465 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | cross-on | cross-on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on |
High Tide | 1:36PM5.36m | 1:53AM5.56m | 2:15PM5.23m | 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 | ||||||||
Low Tide | 7:42PM1.01m | 8:06AM0.98m | 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 | ||||||||
 |  |  |  |  |  | |  | | | |  | | | | | | | | |  | |
 | 6:26 | — | — | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — | 6:33 | — | — | 6:35 | — | — | 6:37 | — | — |
 | — | 8:08 | — | — | 8:06 | — | — | 8:04 | — | — | 8:01 | — | — | 7:59 | — | — | 7:57 | — | — | 7:53 | — |
mm | — | 1 | 1 | 10 | — | — | — | — | 4 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 18 | 18 | 16 | 17 | 18 | 18 | 17 | 17 | 15 | 17 | 15 | 14 | 15 | 15 | 15 | 18 | 17 | 16 | 16 | 16 |
Feels °C | 11 | 13 | 16 | 11 | 13 | 14 | 14 | 12 | 12 | 9 | 11 | 9 | 10 | 11 | 11 | 10 | 12 | 11 | 13 | 13 | 15 |
Swell 1 Height (m) Direction Period (s) | — | — | SSW 5 | — | SW 16 | SW 15 | SW 14 | SW 14 | WNW 4 | SW 14 | SW 14 | SSW 6 | NNW 5 | NNW 4 | SW 5 | SW 13 | SW 13 | SSW 6 | WNW 3 | WSW 12 | — |
| kJ | — | — | 34 | — | 10 | 9 | 8 | 8 | 1 | 8 | 8 | 22 | 13 | 3 | 1 | 7 | 6 | 63 | 2 | 13 | — |
Swell 2 Height (m) Direction Period (s) | — | — | NW 4 | — | — | — | — | — | SW 14 | — | SW 14 | SW 14 | SW 6 | SW 13 | SW 13 | SW 13 | — | SW 12 | SW 12 | — | — |
| kJ | — | — | 1 | — | — | — | — | — | 8 | — | 8 | 8 | 8 | 7 | 7 | 7 | — | 6 | 23 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | SW 14 | SW 13 | — | — | — | — | WNW 4 | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 7 | 7 | — | — | — | — | 1 | — | — |
Wind waves Height (m) Direction Period (s) | SW 4 | SSW 5 | — | SSW 5 | SSW 6 | SW 7 | SW 7 | SW 6 | SW 7 | WSW 5 | SW 5 | NW 5 | W 4 | SW 5 | SSW 3 | SSW 4 | SSW 5 | W 4 | SSW 6 | SSW 4 | SW 7 |
| kJ | 20 | 67 | — | 99 | 266 | 287 | 124 | 105 | 183 | 84 | 67 | 51 | 2 | 7 | 3 | 15 | 111 | 6 | 21 | 31 | 465 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 305 | 323 | 246 | 246 | 246 | 287 | 285 | 376 | 210 | 187 | 179 | 179 | 192 | 192 | 179 | 241 | 305 | 279 | 51 | 167 | 50 |
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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