Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 30 Jul 2026:
- Most powerful swell: Friday 31 Jul, 10PM (local time) - 2ft (0.6m), 4s period, SW swell with 16 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 0.6m 4s and forecast to arrive on Friday (Jul 31) 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 0.7m 4s period and expected on Monday (Aug 03) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Fri 31st Jul) | 2ft (0.6m) 4s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright, Rusty here. Let's be straight with you about Trearddur Bay.
Honestly, looking at the whole 16-day window, it's a tough stretch. The swell is tiny and the wind is often messy. There’s no real stand-out day to get excited about. The forecast is currently showing a blank run for the entire period, which is a real bummer for a spot that’s fairly exposed to the south-west.
The only wave on the cards is a tiny, inconsistent little thing at Trearddur Bay (Holy Island). It’s a beginner-friendly break, but it’s rarely breaking, and right now it’s barely showing any life. The water is feeling about average for the time of year.
For the first few days, from Thursday the 30th of July through the weekend, it’s all small chop and cross-shore mess. The best of a bad bunch might be Thursday afternoon, where the wind drops to glassy offshore, but the swell is only 1ft from the NW with a period of just 3 seconds. That’s barely a ripple (combined energy of 5). It’s not worth paddling out for.
Into the first week of August, the swell doesn't improve. We get a few days of clean offshore wind from the ENE, but the swell height stays stuck at 0.3ft to 1.0ft. You’ll see some clean conditions on the 3rd and 4th of August, but with combined energy levels of 3 to 12, there’s just no wave to ride. The wind is offshore, which is a positive, but the swell is nonexistent.
The second week of August is more of the same. Clean, offshore winds on the 9th, 10th, and 11th, but the swell is a pathetic 0.3ft, even with a long period of 11-12 seconds. That long period might sound good, but with no height, it’s a dud. The combined energy barely reaches 7.
The last few days of the forecast, around the 12th and 13th, the wind swings onshore and the swell stays tiny. It’s just not on.
Look, it’s a quiet period. The surf is poor, the consistency is terrible, and it’s best to leave the board in the van. This kind of blank run is more normal for the area, but it doesn’t make it any easier to swallow. Keep an eye on the charts, things can change. For now, it’s a flat spell.
Rusty.
Short Range ForecastMostly dry. Very mild (max 17°C on Fri afternoon, min 13°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 11mm), heaviest on Mon night. Very mild (max 19°C on Sun afternoon, min 13°C on Mon night). Winds increasing (calm on Sun morning, fresh winds from the ENE by Mon afternoon). | ||||||||||||||||||||
Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | |||||||||||||||
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) | WNW 4 | NW 3 | WSW 3 | W 4 | SW 3 | SSW 5 | WNW 4 | NW 3 | SW 4 | SSW 4 | W 9 | SW 10 | SW 9 | SW 9 | SW 8 | SW 8 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 9 | 3 | 3 | 10 | 3 | 14 | 9 | 3 | 5 | 1 | 2 | 4 | 3 | 12 | 10 | 9 | 5 | 5 | 4 | 4 | 7 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | glassy | cross-on | cross-on | on | cross | cross-on | on | cross-on | glassy | off | cross-off | cross-off | cross-off | off | cross-off | off | cross-off | cross-off | off | off |
High Tide | 11:54AM5.05m | 00:03AM5.49m | 12:26PM5.10m | 00:36AM5.52m | 12:58PM5.13m | 1:09AM5.52m | 1:32PM5.12m | 1:43AM5.48m | 2:07PM5.09m | 2:20AM5.40m | 2:46PM5.01m | 3:02AM5.25m | 3:31PM4.87m | 3:52AM5.04m | |||||||
Low Tide | 5:41AM1.11m | 5:50PM1.23m | 6:14AM0.99m | 6:23PM1.15m | 6:46AM0.92m | 6:56PM1.12m | 7:20AM0.89m | 7:31PM1.14m | 7:56AM0.93m | 8:09PM1.21m | 8:35AM1.03m | 8:51PM1.35m | 9:20AM1.21m | 9:40PM1.55m | |||||||
 | |  | | | | | |  | |  | |  | |  |  | |  | | | | |
 | 5:30 | — | — | 5:31 | — | — | 5:33 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — |
 | — | — | 9:17 | — | — | 9:15 | — | — | 9:14 | — | — | 9:12 | — | — | 9:10 | — | — | 9:08 | — | — | 9:07 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 9 | 1 | 1 | 1 | 4 | 3 | — |
Temp °C | 14 | 16 | 16 | 14 | 17 | 17 | 13 | 15 | 15 | 18 | 19 | 16 | 17 | 19 | 15 | 15 | 15 | 14 | 14 | 14 | 13 |
Feels °C | 10 | 13 | 14 | 11 | 13 | 14 | 9 | 12 | 12 | 15 | 15 | 12 | 12 | 14 | 10 | 11 | 10 | 10 | 14 | 14 | 7 |
Swell 1 Height (m) Direction Period (s) | SW 4 | NW 3 | — | SW 4 | NW 3 | SSW 5 | SW 5 | NW 3 | — | SSW 4 | — | SW 10 | NNW 3 | SW 9 | SW 8 | SW 8 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SW 6 |
| kJ | 5 | 3 | — | 3 | 2 | 14 | 7 | 3 | — | 1 | — | 4 | 2 | 12 | 10 | 9 | 5 | 5 | 4 | 4 | 2 |
Swell 2 Height (m) Direction Period (s) | — | SSW 5 | — | — | — | — | — | — | W 9 | — | W 9 | SW 8 | SW 9 | — | — | — | — | — | — | SE 4 | — |
| kJ | — | 2 | — | — | — | — | — | — | 2 | — | 2 | 3 | 3 | — | — | — | — | — | — | 1 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 13 | SW 13 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 7 |
Wind waves Height (m) Direction Period (s) | WNW 4 | — | WSW 3 | W 4 | SW 3 | WNW 2 | WNW 4 | SSW 5 | SW 4 | — | NNE 3 | NNE 3 | NE 3 | NE 3 | NE 4 | NE 4 | NE 4 | ENE 3 | ENE 4 | ENE 3 | NE 5 |
| kJ | 9 | — | 3 | 10 | 3 | 1 | 9 | 2 | 5 | — | 3 | 2 | 2 | 7 | 11 | 6 | 11 | 3 | 9 | 3 | 5 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 548 | 587 | 246 | 292 | 368 | 278 | 385 | 368 | 246 | 249 | 184 | 179 | 155 | 208 | 187 | 286 | 280 | 284 | 316 | 284 | 283 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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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