Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 30 Aug 2026:
- Most powerful swell: Friday 4 Sep, 7AM (local time) - 8ft (2.5m), 7s period, WSW swell with 672 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 2.5m 7s and forecast to arrive on Friday (Sep 04) at 7AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Saturday (Sep 05) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7AM (Fri 4th Sep) | 8ft (2.5m) 7s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright, Rusty here, and I’ve got the lowdown on Trearddur Bay (Holy Island). Straight up, it’s a tough stretch. This spot is inconsistent and mostly set up for beginners when it’s working, but we’re looking at a long dry spell before anything worthwhile shows up.
The water temp is about average for this time of year. No major anomalies to report.
We’ve got a solid gap of no real surf for the first couple of weeks. From Sunday the 30th of August all the way through to Saturday the 12th of September, it’s a write-off. We’re seeing fresh to strong winds, mostly onshore or cross-onshore, with the swell bouncing around between 3ft and 8ft but it’s all messy and lumpy. The energy is weak to moderate at best, with values like 92 (weak) and up to 451 (moderate) on the 10th, but the wind ruins it. For a beach break like this, it’s worth saying the setup on those bigger, windier days like Friday the 4th of September (8ft from the WSW with strong cross-onshore winds at 28 mph) looks more interesting for kite surfing than paddle surfing.
Then, finally, we get a glimmer. On Sunday the 13th of September morning, things change. The wind swings around to a light ENE at 3 mph, going cross-offshore. That’s clean. The swell drops to 3ft from the SW with an 8-second period (moderate energy of 138). It’s surfable but very ordinary – a real small-wave cruiser session for a beginner. The afternoon stays clean with a 5ft WNW swell, but it’s still just “ordinary.”
Monday the 14th of September morning holds a little more clean surf: 4ft from the WNW with light NNW winds and a period of 5 seconds. Again, nothing special, but it’s the only clean, rideable window in the whole 16 days. If you’re desperate for a paddle, that Sunday and Monday are it. Remember, this break is inconsistent, so a blank run like this is more normal for the area. Forecasts can change, though.
Keep your head up.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Sun morning. Very mild (max 18°C on Tue night, min 14°C on Sun night). Winds increasing (light winds from the WSW on Mon afternoon, strong winds from the SSW by Tue night). | Days 4-6 Weather SummaryModerate rain (total 10mm), heaviest on Thu afternoon. Very mild (max 18°C on Wed afternoon, min 14°C on Thu night). Mainly strong winds. | ||||||||||||||||||||
Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | |||||||||||||||
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 8 | SSW 5 | SW 7 | WNW 6 | NW 5 | SSW 7 | SW 4 | SSW 5 | SW 6 | SW 7 | SSW 6 | SW 7 | SW 6 | SSW 6 | WSW 6 | WSW 7 | WSW 6 | NW 6 | SW 5 | SW 6 | SSW 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 113 | 103 | 116 | 176 | 57 | 21 | 41 | 90 | 114 | 305 | 209 | 263 | 119 | 176 | 340 | 580 | 238 | 133 | 17 | 9 | 68 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross | cross-on | on | on | on | on | on | on | on | on | on | on | cross-on | cross-on | cross | cross | on | cross-on |
High Tide | 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 | 3:59PM4.75m | 4:41AM4.69m | 5:21PM4.55m | ||||||||
Low Tide | 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 | 9:47AM1.66m | 10:23PM1.82m | 10:59AM2.01m | 11:50PM1.99m | ||||||||
 |  |  |  | |  |  |  |  | | |  | | | | |  | | | | | |
 | 6:22 | — | — | 6:24 | — | — | 6:26 | — | — | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — | 6:33 | — | — |
 | — | 8:13 | — | — | 8:10 | — | — | 8:08 | — | — | 8:06 | — | — | 8:04 | — | — | 8:01 | — | — | 7:59 | — |
mm | 2 | 1 | 1 | — | — | — | — | — | 1 | — | — | — | — | 5 | 4 | — | 1 | — | — | — | — |
Temp °C | 17 | 17 | 16 | 15 | 16 | 16 | 16 | 17 | 18 | 17 | 18 | 18 | 16 | 16 | 15 | 16 | 17 | 15 | 13 | 14 | 14 |
Feels °C | 13 | 12 | 13 | 9 | 12 | 12 | 11 | 12 | 15 | 12 | 13 | 15 | 12 | 11 | 9 | 9 | 10 | 8 | 9 | 10 | 10 |
Swell 1 Height (m) Direction Period (s) | — | — | SW 7 | SW 8 | SW 8 | SSW 7 | — | — | — | — | — | SW 15 | SW 14 | — | — | — | SW 14 | SW 6 | SW 5 | N 5 | — |
| kJ | — | — | 116 | 62 | 51 | 21 | — | — | — | — | — | 9 | 8 | — | — | — | 8 | 35 | 17 | 12 | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | NNW 4 | — | — | — | — | — | — | — | — | — | — | — | SW 14 | SW 14 | WNW 4 | SW 13 |
| kJ | — | — | — | — | — | 4 | — | — | — | — | — | — | — | — | — | — | — | 8 | 7 | 5 | 7 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 13 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 7 | — |
Wind waves Height (m) Direction Period (s) | SSW 8 | SSW 5 | — | WNW 6 | NW 5 | W 3 | SW 4 | SSW 5 | SW 6 | SW 7 | SSW 6 | SW 7 | SW 6 | SSW 6 | WSW 6 | WSW 7 | WSW 6 | NW 6 | NW 5 | SW 6 | SSW 5 |
| kJ | 113 | 103 | — | 176 | 57 | 5 | 41 | 90 | 114 | 305 | 209 | 263 | 119 | 176 | 340 | 580 | 238 | 133 | 62 | 9 | 68 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 51 | 286 | 275 | 51 | 280 | 51 | 51 | 195 | 235 | 246 | 585 | 503 | 284 | 285 | 326 | 1075 | 838 | 548 | 548 | 179 | 51 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
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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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