Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 22 Jul 2026:
- Most powerful swell: Tuesday 28 Jul, 10PM (local time) - 4ft (1.2m), 5s period, SW swell with 79 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 Tuesday (Jul 28) 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 6s period and expected on Thursday (Jul 23) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Tue 28th Jul) | 4ft (1.2m) 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’s on offer for Trearddur Bay over the next couple of weeks.
To be straight with you, looking at the whole 16-day window, it’s a tough stretch. We’ve got a long run of days where the surf is just not cooperating. From Wednesday the 22nd right through to the middle of the following week, it’s all pretty flat or blown out. There’s a gap of nearly a week and a half of pretty poor conditions before we see any real energy.
The first real pulse of size shows up on Friday the 31st of July. Trearddur Bay (Holy Island) starts seeing some solid swell, but the wind is a real problem. We’ve got a fresh cross-onshore breeze ripping at 19 mph, making it lumpy and messy. The swell is coming from the SSW at 6 ft to 6 ft, with a short period of 6 seconds, so it’s a bit of a junky, wind-affected wave. The combined energy is moderate (184 to 270). However, it’s still a messy cross-onshore situation, so the quality is poor. This is really only a look for the dedicated, and more likely to be a kite session than a clean paddle.
The best chance of a wave, and I mean the only real standout, comes on Sunday the 2nd of August. Trearddur Bay has a cleaner look. It’s still a bit of a mix with the wind being cross-on from the WSW at 12 mph in the morning, but the swell is a solid 6 ft from the NW with a 6-second period. The combined energy is strong (241). By the afternoon, the wind swings onshore from the SW at 9 mph, but the swell holds at 5 ft from the NW. This is the pick of the bunch. The wave will have some push to it, but it’s a bit chunky. For a beginner, this 6 ft swell is getting a bit too big. For the rest of us, it’s the only window with real power and a shot at a few decent ones. The water temperature is about average for this time of year, nothing wild to report there.
The rest of the run into the start of August is a bust. The swell drops off quickly after that Sunday, and we’re back to tiny, poor surf with onshore winds. It’s a frustrating outlook, but it tends not to stay this poor for long, so keep an eye on it.
Rusty.
Short Range ForecastMostly dry. Very mild (max 18°C on Thu afternoon, min 13°C on Wed morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Sat morning. Very mild (max 17°C on Sat afternoon, min 13°C on Sun night). Mainly fresh winds. | ||||||||||||||||||||
Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | |||||||||||||||
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) | NNW 6 | NNW 5 | N 6 | N 5 | N 5 | N 5 | S 13 | S 13 | WSW 3 | WSW 3 | WSW 5 | SSW 5 | WNW 5 | SW 6 | SW 5 | W 4 | SSW 3 | SW 5 | SSW 5 | SSW 4 | SW 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 3 | 3 | 10 | 37 | 18 | 37 | 14 | 1 | 4 | 10 | 57 | 52 | 32 | 57 |
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-on | on | cross | on | on | cross-on | cross | cross-on | cross | cross-on | cross-on | on | on | cross-on | cross-on |
High Tide | 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 | 10:10AM4.66m | 10:22PM5.05m | 10:47AM4.83m | 10:57PM5.25m | ||||||||
Low Tide | 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 | 4:07PM1.71m | 4:33AM1.50m | 4:44PM1.52m | ||||||||
 | |  | |  |  | | |  |  |  | | | | | | |  | | | | |
 | 5:18 | — | — | 5:20 | — | — | 5:20 | — | — | 5:22 | — | — | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — |
 | — | — | 9:30 | — | — | 9:28 | — | — | 9:27 | — | — | 9:25 | — | — | 9:23 | — | — | 9:22 | — | — | 9:21 |
mm | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | 2 | — | — | — |
Temp °C | 14 | 17 | 15 | 15 | 18 | 17 | 15 | 17 | 17 | 15 | 17 | 16 | 15 | 17 | 17 | 16 | 17 | 17 | 18 | 17 | 18 |
Feels °C | 10 | 13 | 12 | 12 | 16 | 15 | 13 | 14 | 15 | 11 | 15 | 13 | 10 | 13 | 13 | 10 | 11 | 15 | 14 | 12 | 17 |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | — | — | N 4 | NW 4 | WSW 3 | — | S 12 | SSW 5 | SW 6 | NW 4 | SW 5 | NNW 4 | N 4 | — | — | — | SW 5 |
| kJ | — | — | — | — | — | — | 6 | 3 | 3 | — | 3 | 18 | 11 | 14 | 1 | 6 | 1 | — | — | — | 57 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | S 13 | S 13 | — | S 12 | — | — | — | SW 6 | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | 3 | 3 | — | 3 | — | — | — | 11 | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 6 | NNW 5 | N 6 | N 5 | N 5 | N 5 | — | — | — | WSW 3 | WSW 5 | NW 4 | WNW 5 | — | NW 4 | W 4 | SSW 3 | SW 5 | SSW 5 | SSW 4 | SW 5 |
| kJ | 65 | 50 | 98 | 59 | 25 | 10 | — | — | — | 10 | 37 | 7 | 37 | — | 13 | 4 | 10 | 57 | 52 | 32 | 45 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 59 | 273 | 882 | 280 | 280 | 297 | 250 | 415 | 1084 | 249 | 388 | 376 | 517 | 548 | 548 | 285 | 246 | 251 | 125 | 251 | 236 |
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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