Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 20 Jul 2026:
- Most powerful swell: Saturday 25 Jul, 4PM (local time) - 4ft (1.2m), 5s period, SW swell with 67 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 1.2m 5s and forecast to arrive on Saturday (Jul 25) at 4PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Sunday (Jul 26) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Sat 25th Jul) | 4ft (1.2m) 5s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright folks, it’s Rusty here. Let's just rip the band-aid off straight away: the next 16 days around Trearddur Bay are mostly a write-off. We've got a long stretch of nothingness ahead. The first few days are a total blank—no swell, no nothing. Then, even when we do see a few tiny pulses, the wind is never on our side.
Honestly, from Monday 20 July right through to the end of the month, it’s a grim watch. The only real window of *anything* happens on Saturday 25 July, with a 4ft swell from the southwest pushing in by the afternoon. But with a 5-second period and a fresh onshore breeze, it's gonna be a messy, blown-out mess. The combined energy is only 70 (weak), and the wind is pushing straight onshore. It's more of a kite-surfing kind of set-up than a paddling day.
The rest of the window is filled with tiny cross-offshore slop that barely registers. A few 3ft swells pop up on Tuesday 28 July and Wednesday 29 July, but the period is a paltry 4 seconds and the wind is cross or cross-off, making it lumpy and uninviting. The water is sitting at 62°, which is a touch warmer than normal for this time of year, but that’s about the only bright spot.
There is no standout session. Nothing to get excited about. The consistency is non-existent, and the local break is inconsistent at the best of times. A blank run like this is more normal for the area than you'd hope. We'll keep an eye on the charts, but for now, I'd leave the board in the van.
Rusty.
Short Range ForecastMostly dry. Very mild (max 17°C on Wed afternoon, min 11°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Sat morning. Very mild (max 19°C on Thu afternoon, min 13°C on Sat morning). Winds increasing (calm on Thu night, fresh winds from the SW by Sat morning). | ||||||||||||||||||||
Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | |||||||||||||||
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) | N 5 | NNW 5 | N 6 | NNW 5 | N 5 | N 7 | NNW 6 | NNW 5 | NNW 6 | N 5 | NW 2 | N 4 | S 13 | S 13 | SW 3 | NW 4 | SW 5 | SW 6 | SW 6 | SW 6 | SW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 4 | 3 | 4 | 4 | 67 | 34 | 6 | 1 | 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 | glassy | cross-on | cross-on | cross | on | on | cross-off | cross-off | cross | cross |
High Tide | 3:38PM4.82m | 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 | ||||||||
 |  |  | | |  | | | | | | | | |  |  |  | | | | | |
 | 5:15 | — | — | 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 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — |
Temp °C | 14 | 16 | 15 | 14 | 14 | 14 | 14 | 17 | 17 | 14 | 19 | 18 | 16 | 17 | 17 | 14 | 16 | 15 | 14 | 15 | 14 |
Feels °C | 11 | 13 | 11 | 11 | 11 | 12 | 10 | 13 | 14 | 12 | 17 | 18 | 13 | 14 | 14 | 9 | 14 | 14 | 9 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | N 5 | N 4 | N 4 | S 13 | WNW 3 | — | NW 4 | S 12 | SW 6 | SW 6 | SW 6 | N 5 |
| kJ | — | — | — | — | — | — | — | — | — | 18 | 6 | 1 | 3 | 1 | — | 3 | 3 | 34 | 6 | 1 | 11 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | S 13 | — | S 12 | — | — | — | — | SW 6 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | — | 3 | — | — | — | — | 1 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | N 5 | NNW 5 | N 6 | NNW 5 | N 5 | N 7 | NNW 6 | NNW 5 | NNW 6 | NNW 5 | NW 2 | — | WNW 3 | — | SW 3 | SW 3 | SW 5 | NW 4 | NNW 6 | NNW 5 | — |
| kJ | 25 | 35 | 77 | 26 | 23 | 176 | 160 | 42 | 50 | 5 | 1 | — | 4 | — | 4 | 4 | 67 | 6 | 170 | 51 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 284 | 1095 | 285 | 267 | 358 | 59 | 59 | 292 | 280 | 280 | 1083 | 251 | 251 | 1811 | 251 | 599 | 1515 | 179 | 101 | 292 | 194 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Trearddur Bay (Holy Island) surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest