Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 22 Jul 2026:
- Most powerful swell: Tuesday 28 Jul, 10PM (local time) - 4.5ft (1.4m), 6s period, SW swell with 128 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 1.4m 6s and forecast to arrive on Tuesday (Jul 28) at 10PM. Winds are predicted to be 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) | 4.5ft (1.4m) 6s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright, let’s be honest – this is a rough patch for Trearddur Bay (Holy Island). Over the next couple of weeks, there’s hardly a wave worth getting wet for, and the wind is just piling on. The water’s about 62°, which is a touch warmer than normal for this time of year, but that’s the only bright spot.
Wednesday the 22nd and Thursday the 23rd are dead flat. Wind from the north at around 16 mph, blowing cross-off, so it’s clean but there’s nothing to ride.
Friday the 24th, a tiny 0.3ft south swell shows up with a long 13-second period, but the energy is next to nothing – just 3. You might see a knee-high ripple, but the wind goes cross or onshore later, so it’s not worth it.
Saturday the 25th, a slight bump to 3ft from the WSW, but the period is a terrible 4 seconds. That’s pure wind chop, with onshore winds at 16 mph. Energy is only 29. Not surfable.
Sunday the 26th drops to 1ft, and the wind is fresh from the WNW at 19 mph, making it lumpy and ugly. This is kite-surfing weather, not for paddle surfing.
The rest of the first week and into the second is more of the same – tiny swells, short periods, and onshore or cross-onshore winds. On Tuesday the 28th, wind hits 25 mph from the SSW, with a 4ft SSW swell (period 5 seconds) and energy of 54. It’s messy, strong, and blown out.
Friday the 31st, the swell rises to 5ft from the SSW, period 6 seconds, and energy hits 160. That’s moderate energy, but the wind is cross-onshore at 16 mph, so it’s choppy and poor.
On Sunday the 2nd of August, we get the biggest swell of the period – 6ft from the SSW, period 6 seconds, energy 209. Moderate energy, but with onshore wind from the SW at 9 mph, and this break is a beginner spot that’s inconsistent. Crowds can show up “sometimes,” but the conditions are poor. Too big for beginners and not clean enough for better surfers.
After that, it fades back to tiny, weak swells, with onshore wind and poor conditions all the way to Thursday the 6th of August. There’s one moment on the 4th with a 3ft W swell, but again, the wind is cross-onshore and choppy.
Bottom line: there’s no standout session here. The whole 16-day window is a washout for decent surf. This break is inconsistent and doesn’t often fire, so a blank run is pretty normal. Forecasts can change, but right now, I’d be staying dry.
Rusty.
Short Range ForecastMostly dry. Very mild (max 17°C on Thu afternoon, min 13°C on Wed morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 5mm), mostly falling on Sat night. Very mild (max 17°C on Sat afternoon, min 13°C on Sun night). Winds increasing (light winds from the W on Sat night, fresh winds from the S by Mon night). | ||||||||||||||||||||
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) | N 6 | NNW 5 | N 6 | N 6 | N 5 | N 5 | S 13 | S 13 | WSW 3 | WSW 4 | SW 5 | SW 6 | SW 5 | SW 6 | SW 6 | NW 4 | SSW 4 | SSW 4 | SSW 4 | SSW 5 | SW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 3 | 4 | 23 | 31 | 18 | 7 | 11 | 1 | 7 | 18 | 12 | 11 | 54 | 89 |
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 | on | cross-on | cross-on | cross-on | cross | cross | on | cross-on | cross-on | cross-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 | — | 4 | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 16 | 15 | 15 | 17 | 17 | 14 | 16 | 16 | 15 | 17 | 15 | 15 | 16 | 16 | 15 | 16 | 16 | 17 | 17 | 17 |
Feels °C | 10 | 13 | 12 | 12 | 14 | 15 | 13 | 14 | 13 | 11 | 14 | 13 | 10 | 13 | 11 | 9 | 10 | 12 | 11 | 11 | 17 |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | — | — | N 5 | NNW 4 | — | S 12 | S 12 | SW 6 | SW 5 | SW 6 | SW 6 | NW 4 | — | SSW 4 | — | — | SW 6 |
| kJ | — | — | — | — | — | — | 7 | 3 | — | 3 | 3 | 18 | 7 | 11 | 1 | 7 | — | 12 | — | — | 89 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | S 13 | S 13 | — | S 12 | S 12 | NW 3 | — | N 3 | — | SW 6 | — | — | — | — | — |
| kJ | — | — | — | — | — | — | 3 | 3 | — | 3 | 3 | 2 | — | 1 | — | 5 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | N 6 | NNW 5 | N 6 | N 6 | N 5 | N 5 | — | — | WSW 3 | WSW 4 | SW 5 | — | NNW 4 | WNW 3 | NNW 3 | — | SSW 4 | — | SSW 4 | SSW 5 | — |
| kJ | 62 | 48 | 98 | 62 | 36 | 16 | — | — | 4 | 23 | 31 | — | 3 | 1 | 1 | — | 18 | — | 11 | 54 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 273 | 292 | 59 | 267 | 323 | 292 | 292 | 1083 | 385 | 376 | 376 | 236 | 278 | 195 | 179 | 192 | 251 | 246 | 332 | 250 | 51 |
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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