Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 21 Jul 2026:
- Most powerful swell: Saturday 25 Jul, 4PM (local time) - 2.5ft (0.8m), 4s period, WSW 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 4PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 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 | 4PM (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 be straight with you – the next 16 days are looking like a write-off for Trearddur Bay (Holy Island). There’s a big fat gap in the surf calendar to start, with absolutely nothing on offer from Tuesday the 21st right through to Thursday the 24th of July. That’s a solid three days of flatness.
The first tiny flicker of life shows up on Friday the 24th, but it’s barely a whisper. We’re talking a 0.3ft south swell with a 13-second period, giving you a combined energy of only 3. It’s basically a lake ripple. The sea temp is sitting at 62°, which is a touch warmer than normal for the time of year, but you won't be feeling it because you won't be paddling.
Saturday the 25th sees a bit more push, with a sloppy 2ft to 3ft west-southwest swell, but it’s short-period windswell at just 4 seconds, and the wind is onshore out of the southwest at 16 mph. That’s a messy, blown-out combo. The combined energy creeps up to 24, but it’s not surfable in any meaningful way.
The rest of the run is a broken record. We get a few 0.7ft to 1ft pulses from the south-southwest and southwest, but the period rarely gets above 6 seconds, and the combined energy never breaks into double digits. The only time we see glassy conditions is on the 30th of July and the 1st of August, but there’s just no swell to go with it. For a break that’s inconsistent at the best of times, this is a particularly blank run. Even the longer-period south swell on the 24th only managed a 0.3ft height.
Honestly, for a beach-and-reef setup like Trearddur Bay, with this kind of weak, short-period junk and strong cross-shore winds, it looks more interesting for a kite than a paddle. There’s simply nothing to get excited about. The forecasts can change, but right now, you’re better off finding a different hobby for a while.
- Rusty
Short Range ForecastMostly dry. Very mild (max 18°C on Thu afternoon, min 11°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 12mm), heaviest on Sat night. Very mild (max 18°C on Fri afternoon, min 14°C on Fri morning). Winds decreasing (fresh winds from the NW on Sat night, light winds from the NNE by Sun night). | ||||||||||||||||||||
Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | |||||||||||||||
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 | N 5 | N 7 | NNW 6 | NNW 6 | N 6 | N 6 | N 5 | N 4 | S 13 | S 13 | WSW 3 | W 4 | WSW 4 | SW 5 | SW 6 | WNW 3 | SW 5 | SW 5 | W 3 | SW 3 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 3 | 2 | 9 | 21 | 12 | 5 | 2 | 1 | 1 | 2 | 2 |
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-on | on | on | on | on | cross-on | cross | cross-off | cross-off | cross | cross-on | cross-on |
High Tide | 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 | 10:10AM4.66m | 10:22PM5.05m | ||||||||
Low Tide | 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 | 4:07PM1.71m | ||||||||
 |  |  | | | | | |  | | | |  |  |  | | | | | | | |
 | 5:16 | — | — | 5:18 | — | — | 5:20 | — | — | 5:20 | — | — | 5:22 | — | — | 5:24 | — | — | 5:26 | — | — |
 | — | — | 9:30 | — | — | 9:30 | — | — | 9:28 | — | — | 9:27 | — | — | 9:25 | — | — | 9:23 | — | — | 9:22 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | 10 | — | — | — | — | — | — |
Temp °C | 13 | 15 | 13 | 15 | 17 | 15 | 15 | 18 | 18 | 15 | 18 | 17 | 14 | 15 | 15 | 16 | 17 | 16 | 15 | 17 | 17 |
Feels °C | 10 | 13 | 11 | 11 | 13 | 12 | 12 | 16 | 16 | 13 | 15 | 15 | 10 | 11 | 13 | 12 | 14 | 14 | 14 | 16 | 15 |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | — | — | — | N 5 | N 4 | S 13 | W 3 | — | S 12 | S 12 | SW 5 | SW 6 | N 5 | SW 5 | SW 5 | N 4 | — |
| kJ | — | — | — | — | — | — | — | 18 | 3 | 3 | 1 | — | 3 | 3 | 12 | 5 | 10 | 1 | 1 | 6 | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NW 3 | — | SW 5 | — | — | SW 5 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | 1 | — | — | 1 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | S 13 | — | — | — | S 11 | — | — | — | — | SW 5 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 3 | — | — | — | 2 | — | — | — | — | 1 | — |
Wind waves Height (m) Direction Period (s) | N 5 | N 5 | N 7 | NNW 6 | NNW 6 | N 6 | N 6 | — | — | NNW 4 | — | WSW 3 | W 4 | WSW 4 | — | NNW 5 | WNW 3 | NNW 4 | NNW 5 | W 3 | SW 3 |
| kJ | 16 | 15 | 148 | 155 | 65 | 64 | 49 | — | — | 1 | — | 2 | 9 | 21 | — | 36 | 2 | 12 | 25 | 2 | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 380 | 1083 | 59 | 273 | 1084 | 280 | 280 | 297 | 278 | 292 | 879 | 251 | 376 | 376 | 384 | 384 | 565 | 250 | 184 | 235 | 246 |
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