Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 21 Jul 2026:
- Most powerful swell: Saturday 25 Jul, 7PM (local time) - 2.5ft (0.8m), 4s period, SW swell with 21 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 0.8m 4s and forecast to arrive on Saturday (Jul 25) at 7PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Wednesday (Jul 22) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Sat 25th Jul) | 2.5ft (0.8m) 4s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s take a good, honest look at what’s on offer for Trearddur Bay (Holy Island).
Right off the bat, I’ve got to be straight with you: the next 16 days are looking pretty grim for a proper paddle. The charts show a big, long stretch of nothing. From now through the 23rd of July, there’s zero wave energy on the cards – the combined energy is sitting at a flat 0. It’s going to be a classic summer flat spell, with clear skies and a cross-off breeze from the NNW, but not a single ripple worth riding. That’s a solid week of no surf.
We finally see a tiny pulse around the 24th of July. On Friday morning, a tiny 0.3ft south swell creeps in with a 13-second period, but it’s weak. The combined energy is only 6. Wind is a light cross-onshore from the WNW, so it’s bumpy. This is strictly for a beginner wanting to bob around, nothing more. The water is sitting at 62°, which is a touch warmer than normal for this time of year, so that’s a small comfort.
The rest of the outlook is a real struggle. Saturday the 25th sees a bit of a bump in energy to 22 on the afternoon, with a 3ft swell from the SW, but the period is a terrible 4 seconds – that’s just wind chop. Add to that a moderate onshore wind and light rain, and it’s a write-off.
The whole second week is more of the same. We get a few tiny pulses of energy, but nothing breaks the 22 mark. The best of a bad bunch might be the morning of the 30th of July. A clean 1ft from the NW with a period of 4 seconds and a light cross-off wind from the NNW. The combined energy is only 6. It’s clean, but tiny and weak. For a complete beginner on a foamy, it’s a session, but for anyone else, it’s not worth the drive.
Honestly, for this whole 16-day window, there’s no standout day. The swell never gets above 3ft, and when it does show up, the period is too short to hold any shape. With the wind constantly onshore or cross-onshore, the setup here looks more interesting for a kite surfer than a paddle surfer given the conditions. It’s a tough run for Trearddur Bay, but it happens. The forecasts can always change, so keep an eye on it, but for now, I’d be leaving the boards in the van.
Rusty.
Short Range ForecastMostly dry. Very mild (max 18°C on Wed afternoon, min 11°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Sat afternoon. Very mild (max 18°C on Thu afternoon, min 14°C on Fri night). Winds increasing (calm on Thu night, fresh winds from the SW by Sat morning). | |||||||||||||||||||
Mon 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | ||||||||||||||
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) | N 5 | N 6 | N 5 | N 5 | N 7 | NNW 6 | NNW 6 | N 6 | N 5 | N 5 | N 4 | S 13 | S 13 | WSW 2 | S 12 | SW 4 | SW 4 | SW 6 | SSW 5 | SW 5 |
Wave Graph  | ||||||||||||||||||||
 kJ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 3 | 1 | 3 | 19 | 5 | 5 | 3 | 1 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | on | cross-off | on | on | cross-off | cross-off | cross-on | cross-on |
High Tide | 3:53AM5.01m | 4:26PM4.58m | 4:45AM4.69m | 5:23PM4.40m | 5:49AM4.42m | 6:33PM4.31m | 7:10AM4.28m | 7:50PM4.38m | 8:27AM4.33m | 8:53PM4.58m | 9:25AM4.48m | 9:42PM4.82m | ||||||||
Low Tide | 9:37PM1.52m | 10:16AM1.45m | 10:29PM1.82m | 11:11AM1.78m | 11:31PM2.09m | 12:17PM2.03m | 00:48AM2.22m | 1:29PM2.12m | 2:05AM2.17m | 2:34PM2.05m | 3:07AM1.98m | 3:25PM1.90m | 3:54AM1.74m | |||||||
 |  | | |  | | | |  | | | | |  |  |  | | | | | |
 | — | — | 5:16 | — | — | 5:18 | — | — | 5:20 | — | — | 5:20 | — | — | 5:22 | — | — | 5:24 | — | — |
 | — | 9:32 | — | — | 9:30 | — | — | 9:30 | — | — | 9:28 | — | — | 9:27 | — | — | 9:25 | — | — | 9:23 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 7 | — | — | — | — |
Temp °C | 15 | 15 | 14 | 15 | 14 | 15 | 18 | 17 | 15 | 18 | 18 | 16 | 18 | 18 | 14 | 14 | 15 | 16 | 16 | 16 |
Feels °C | 11 | 12 | 11 | 13 | 13 | 11 | 14 | 13 | 12 | 16 | 17 | 14 | 16 | 16 | 11 | 10 | 14 | 12 | 14 | 12 |
Swell 1 Height (m) Direction Period (s) | — | — | — | N 5 | — | — | — | — | — | — | N 4 | S 13 | WNW 3 | — | S 12 | S 12 | SW 4 | SW 6 | NNW 4 | SW 5 |
| kJ | — | — | — | 15 | — | — | — | — | — | — | 3 | 3 | 1 | — | 3 | 3 | 5 | 5 | 2 | 1 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | S 13 | — | — | — | — | SW 6 | — | SSW 5 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 3 | — | — | — | — | 1 | — | 3 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | S 13 | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 3 | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | N 5 | N 6 | N 5 | — | N 7 | NNW 6 | NNW 6 | N 6 | N 5 | N 5 | — | NNW 3 | — | WSW 2 | W 3 | SW 4 | — | NNW 3 | — | NW 3 |
| kJ | 24 | 64 | 24 | — | 171 | 155 | 53 | 77 | 47 | 17 | — | 1 | — | 1 | 3 | 19 | — | 3 | — | 9 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 565 | 285 | 267 | 358 | 59 | 273 | 292 | 288 | 280 | 297 | 278 | 251 | 253 | 251 | 251 | 598 | 548 | 332 | 548 | 548 |
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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