Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 30 Aug 2026:
- Most powerful swell: Friday 4 Sep, 4AM (local time) - 8ft (2.5m), 7s period, SW swell with 612 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 4AM. 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 5s period and expected on Monday (Aug 31) at 4PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4AM (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 folks, Rusty here. Let's have a proper look at what's on the cards for Trearddur Bay.
Honestly, it's a bit of a grim outlook for the next couple of weeks. The water is a touch warmer than normal for this time of year at 64°F, but that's about the only bright spot. We're looking at a long stretch of poor conditions, with nothing rideable for the first few days. The forecast is blank for a solid week, really. The first proper chance of a wave doesn't show up until a week from now, on Saturday the 7th of September, and even then, it's a tough call.
The only break on the radar is Trearddur Bay (Holy Island). It's a beginner-friendly spot, but it's inconsistent and only fairly exposed to the swell. For a wave to really work here, it needs a good solid SW swell, and that just isn't lining up with the wind.
Saturday 29th August has a tiny 2ft SSW swell, but the wind is a gentle NNE offshore, so it would be clean. The problem is the wave energy is weak (29), and it's just too small to bother with.
The whole first week is a write-off. We get a bit of a pulse on Monday 31st August with a 5ft WNW swell, but the wind is a strong cross-shore (25 mph) making it a total mess. That moderate combined energy (207) is all for nothing.
The only time this spot looks even remotely interesting is on Saturday 12th September. The swell is 7ft from the SW with a period of 9 seconds, and the combined energy is strong (723). The wind is a fresh breeze from the SW, which is offshore here. That's a solid, clean setup. However, 7ft is pushing into the "too big for beginners" territory, and the offshore wind should make for some proper lined-up waves. It's a long way off, so don't bank on it, but it's the only standout in the whole 16-day window. The rest of the time, you're battling strong cross-onshore winds, lumpy seas, and blown-out conditions. For most of this period, with the strong winds and poor surf quality, this setup looks more interesting for kite surfing than paddle surfing.
Stay stoked, but maybe keep the board in the car for now.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Sat night. Very mild (max 17°C on Sun morning, min 14°C on Sun night). Winds increasing (light winds from the NW on Sat night, fresh winds from the WNW by Mon morning). | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Tue night. Very mild (max 18°C on Thu 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 4 | SW 7 | NW 6 | SW 8 | SSW 7 | SW 4 | SW 5 | SW 6 | SW 6 | SW 6 | SW 7 | SW 7 | SW 5 | WSW 6 | WSW 6 | SW 6 | SW 6 | SW 6 | SW 7 | SW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 92 | 46 | 104 | 148 | 50 | 21 | 22 | 67 | 97 | 223 | 245 | 268 | 181 | 110 | 393 | 428 | 113 | 32 | 148 | 393 | 424 |
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 | cross-on | on | on | on | on | on | on | on | on | on | cross-on | cross-on | cross | 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 | 6:16AM0.70m | 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 | 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 | — | — | — | — | — | — | 4 | — | — | — | — | — | 2 | — | — | — | — | — | 1 |
Temp °C | 17 | 16 | 16 | 15 | 16 | 16 | 15 | 16 | 16 | 17 | 17 | 17 | 17 | 18 | 17 | 15 | 17 | 14 | 13 | 14 | 15 |
Feels °C | 13 | 11 | 13 | 9 | 12 | 13 | 11 | 11 | 11 | 12 | 11 | 12 | 11 | 12 | 12 | 8 | 10 | 6 | 7 | 12 | 7 |
Swell 1 Height (m) Direction Period (s) | — | — | SW 7 | SW 8 | SW 8 | SSW 7 | — | NW 4 | — | SW 16 | — | SW 15 | SW 14 | — | — | — | SW 6 | SW 6 | N 4 | — | — |
| kJ | — | — | 104 | 65 | 50 | 21 | — | 1 | — | 10 | — | 9 | 8 | — | — | — | 113 | 32 | 2 | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | N 5 | NNW 5 | — | — | — | — | — | — | — | — | — | — | SW 14 | NNW 5 | — | — | — |
| kJ | — | — | — | — | 18 | 4 | — | — | — | — | — | — | — | — | — | — | 8 | 13 | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 14 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 8 | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 8 | SSW 4 | — | NW 6 | WNW 4 | WSW 3 | SW 4 | SW 5 | SW 6 | SW 6 | SW 6 | SW 7 | SW 7 | SW 5 | WSW 6 | WSW 6 | WNW 5 | WNW 4 | SW 6 | SW 7 | SW 7 |
| kJ | 92 | 46 | — | 148 | 21 | 3 | 22 | 67 | 97 | 223 | 245 | 268 | 181 | 110 | 393 | 428 | 45 | 5 | 148 | 393 | 424 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 286 | 275 | 51 | 280 | 51 | 51 | 195 | 235 | 246 | 585 | 503 | 284 | 285 | 326 | 1075 | 838 | 548 | 548 | 179 | 51 | 98 |
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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