Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 19 Aug 2026:
- Most powerful swell: Wednesday 19 Aug, 10PM (local time) - 3.5ft (1.0m), 5s period, SW swell with 50 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 1.0m 5s and forecast to arrive on Wednesday (Aug 19) at 10PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Thursday (Aug 20) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Wed 19th Aug) | 3.5ft (1.0m) 5s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s be straight with you. I’ve had a good look at what’s on offer for Trearddur Bay (Holy Island) over the next couple of weeks, and it’s a pretty grim picture, I’m not gonna lie. The whole 16-day window is a complete write-off for decent surf. There’s nothing here that’s worth paddling out for, mate.
The water is sitting at 64°F right now, which is a touch warmer than normal for this time of year – that’s about the only nice thing I can say.
We’re starting now and we’ve got a long, frustrating gap. From Wednesday the 19th of August all the way through to the end of the month, there’s just nothing. We’re talking day after day of tiny, weak leftovers. The swell is barely a ripple, mostly around 0.3ft to 1ft, with periods all over the place but no power behind it. The combined energy is in the single digits and low teens – that’s tumbleweed territory. The wind is mostly cross-off or clean, but with no waves, it doesn’t matter. It’s a flat spell, plain and simple.
The only hint of life comes right at the end of the run. On Monday the 31st of August, the afternoon shows a bit of a pulse with a 5ft swell from the WNW, but the period is a short 6 seconds, and the wind is onshore. The combined energy hits 149 (moderate), which is the highest we see, but it’s still messy. By Tuesday the 1st of September, it’s back to being blown out and lumpy. The very last day, Wednesday the 2nd of September, has a 4ft swell from the NW with a short 5-second period and light onshore wind. The energy is 99 – still weak. But again, the wind is onshore, and the wave quality is poor. It’s not surfable in any meaningful way.
There’s no standout. There’s no "best on offer." The whole stretch is a bust. For an area like this, a blank run like this can happen. It’s a tough spot to rely on. The setup here is a fairly exposed beach, and with the wind and swell mostly out of sync, the whole thing looks more interesting for a kite session than a paddle. I’d leave the board in the car for a while.
Rusty.
Short Range ForecastModerate rain (total 13mm), heaviest on Wed night. Very mild (max 17°C on Wed afternoon, min 12°C on Thu night). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Very mild (max 19°C on Mon afternoon, min 13°C on Sat morning). Winds increasing (calm on Mon morning, fresh winds from the ENE by Mon night). | ||||||||||||||||||||
Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | |||||||||||||||
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) | WSW 4 | SW 4 | SW 5 | SW 6 | SW 6 | SW 14 | SW 14 | SW 13 | SW 13 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 25 | 23 | 41 | 12 | 11 | 8 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 7 | 8 | 8 | 7 | 7 | 7 | 7 | 6 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off | off | off | off |
High Tide | 3:32PM4.68m | 3:52AM4.62m | 4:23PM4.44m | 4:52AM4.29m | 5:32PM4.26m | 6:23AM4.10m | 7:07PM4.27m | 8:04AM4.17m | 8:27PM4.49m | 9:08AM4.41m | 9:19PM4.79m | 9:52AM4.67m | 9:59PM5.08m | ||||||||
Low Tide | 9:39PM1.83m | 10:14AM1.98m | 10:37PM2.18m | 11:17AM2.31m | 11:58PM2.41m | 12:45PM2.45m | 1:37AM2.37m | 2:08PM2.34m | 2:47AM2.11m | 3:05PM2.09m | 3:35AM1.78m | 3:46PM1.80m | |||||||||
 | |  | |  |  |  | |  |  | | | | | | | | |  | | | |
 | 6:03 | — | — | 6:05 | — | — | 6:07 | — | — | 6:09 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — |
 | — | 8:37 | — | — | 8:36 | — | — | 8:34 | — | — | 8:31 | — | — | 8:29 | — | — | 8:27 | — | — | 8:24 | — |
mm | 1 | 1 | 7 | 3 | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 2 |
Temp °C | 15 | 17 | 16 | 15 | 15 | 14 | 14 | 15 | 14 | 13 | 15 | 14 | 14 | 15 | 15 | 17 | 19 | 19 | 18 | 18 | 16 |
Feels °C | 11 | 12 | 13 | 10 | 10 | 8 | 10 | 10 | 9 | 10 | 11 | 11 | 11 | 12 | 13 | 16 | 17 | 15 | 12 | 13 | 13 |
Swell 1 Height (m) Direction Period (s) | SW 16 | NW 4 | SW 5 | SW 6 | SW 6 | SSW 6 | SW 6 | W 4 | SW 13 | SW 15 | SW 15 | SW 15 | N 4 | N 4 | SW 14 | SW 14 | SW 14 | SW 13 | SSE 4 | — | SW 13 |
| kJ | 10 | 2 | 41 | 12 | 11 | 3 | 1 | 2 | 7 | 8 | 8 | 8 | 10 | 3 | 8 | 8 | 7 | 7 | 3 | — | 6 |
Swell 2 Height (m) Direction Period (s) | SW 16 | S 15 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 6 | — | — | — | S 12 | SW 14 | SW 14 | — | — | — | SW 13 | NE 4 | — | — |
| kJ | 10 | 5 | 10 | 8 | 8 | 8 | 7 | 1 | — | — | — | 3 | 8 | 7 | — | — | — | 7 | 1 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | SW 13 | — | — | — | — | — | — | — | — | — | — | SW 13 | SW 13 | — |
| kJ | — | — | — | — | — | — | — | 7 | — | — | — | — | — | — | — | — | — | — | 7 | 7 | — |
Wind waves Height (m) Direction Period (s) | WSW 4 | SW 4 | WNW 4 | NNW 4 | N 5 | NNW 5 | NNW 5 | NNW 4 | NNW 5 | NNW 5 | NNW 4 | N 5 | — | NNW 4 | — | — | — | ENE 2 | — | — | — |
| kJ | 25 | 23 | 13 | 37 | 62 | 72 | 39 | 11 | 43 | 17 | 15 | 16 | — | 3 | — | — | — | 1 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 246 | 236 | 288 | 179 | 838 | 192 | 192 | 284 | 273 | 241 | 208 | 208 | 273 | 292 | 208 | 246 | 249 | 246 | 252 | 208 | 179 |
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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