Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 20 Jul 2026:
- Best quality surf: Sunday 26 Jul, 7AM (local time) - 3.5ft (1.1m), 6s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 26 Jul, 10AM (local time) - 5ft (1.5m), 5s period, WSW swell with 112 kJ wave energy.
- Next surfable swell (1★+): Sunday 26 Jul, 7AM (local time) - 3.5ft (1.1m), 6s period with SW swell.
Best Forecast Surf Conditions for Trearddur Bay (Holy Island) this week:
The surf forecast for Trearddur Bay (Holy Island) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Jul 26) at 7AM. The primary swell is predicted to be 1.1m and 6s period with a secondary swell of 1.1m and 5s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Trearddur Bay (Holy Island) in the next 16 days are 1.5m 5s and forecast to arrive on Sunday (Jul 26) at 10AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 7s period and expected on Wednesday (Jul 22) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Sun 26th Jul) | 3.5ft (1.1m) 6s |
| Best Surf | 7AM (Sun 26th Jul) | 3.5ft (1.1m) 6s |
| Most Powerful | 10AM (Sun 26th Jul) | 5ft (1.5m) 5s |
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 look at what Trearddur Bay (Holy Island) has in store for us over the next couple of weeks.
Honestly, it’s a pretty bleak picture for the first week, and then some. The opening days are looking like a write-off. From Sunday the 19th right through to Monday the 27th of July, the surf is just not there. We’re looking at a solid 9-day stretch with nothing worth paddling out for. The water is a touch warmer than normal for this time of year at 62°F, but that’s about the only thing going for it.
We do finally see a pulse of energy on the 28th of July, Tuesday morning. The swell jumps up to 5ft from the NW, with a period of 6 seconds. That’s short period, windswell, and the combined energy sits at 171 (moderate). The wind is a fresh cross-onshore from the WNW at 22 mph, making it lumpy. It’s not clean, but for a spot that’s been flat for over a week, it’s the only thing that’s going to break. The waves are in the paddling range, but the wind is going to mess with the shape. This is really the only day that offers any sort of wave, so if you’re desperate, that’s your window.
After that, it drops back to tiny, inconsistent dribble from the 29th of July through to the 3rd of August. The swell is never more than 2ft, and the wind does turn cross-offshore from the NNW, which is a positive, but the energy is so weak (anywhere from 1 to 16) that it’s barely surfable. It’s clean, but clean and flat is still flat.
So, the standout – and I’m using that term loosely – is the morning of Tuesday the 28th of July. It’s the only day with any real size and energy, but it’s not going to be pretty. The rest of the run is a bust. For a beginner spot that’s inconsistent to begin with, a blank stretch like this is more normal than not.
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 4-6 Weather SummarySome drizzle, heaviest during Fri night. Very mild (max 18°C on Fri afternoon, min 13°C on Wed night). Winds increasing (calm on Thu night, fresh winds from the W by Fri night). | ||||||||||||||||||||
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 | N 6 | N 5 | N 5 | WSW 3 | S 13 | NW 4 | WNW 3 | SW 4 | SW 5 | SW 5 | WSW 5 | SW 5 | W 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 5 | 5 | 4 | 18 | 53 | 100 | 112 | 41 | 48 |
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 | on | cross-on | cross-on | cross-on | cross | cross | cross | cross-off |
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 | 9:27AM1.09m | 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 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — |
Temp °C | 14 | 15 | 15 | 14 | 15 | 13 | 15 | 18 | 17 | 14 | 17 | 17 | 15 | 18 | 17 | 14 | 15 | 15 | 15 | 16 | 14 |
Feels °C | 11 | 11 | 11 | 11 | 13 | 11 | 11 | 15 | 14 | 12 | 16 | 18 | 12 | 15 | 15 | 9 | 13 | 14 | 10 | 12 | 9 |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | N 5 | N 5 | N 4 | S 13 | NW 4 | — | NW 4 | NW 4 | S 11 | — | NW 5 | SW 6 |
| kJ | — | — | — | — | — | — | — | — | — | 18 | 7 | 1 | 3 | 5 | — | 10 | 9 | 2 | — | 15 | 13 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | S 13 | — | S 12 | S 12 | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | — | 3 | 3 | — | — | — | — |
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 | N 6 | — | — | WSW 3 | WNW 3 | — | WNW 3 | SW 4 | SW 5 | SW 5 | WSW 5 | SW 5 | W 4 |
| kJ | 25 | 27 | 80 | 26 | 23 | 148 | 150 | 51 | 101 | — | — | 1 | 5 | — | 4 | 18 | 53 | 100 | 112 | 41 | 48 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 284 | 318 | 285 | 267 | 358 | 59 | 273 | 292 | 59 | 280 | 362 | 246 | 1515 | 1186 | 1554 | 565 | 323 | 51 | 192 | 187 | 192 |
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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