Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 6 Aug 2026:
- Most powerful swell: Wednesday 12 Aug, 10PM (local time) - 3.5ft (1.0m), 5s period, SW swell with 43 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 1.0m 5s and forecast to arrive on Wednesday (Aug 12) 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 0.4m 5s period and expected on Thursday (Aug 06) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Wed 12th Aug) | 3.5ft (1.0m) 5s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
G’day, I’m Rusty, and I’m looking at Trearddur Bay (Holy Island) for the next couple of weeks. Honestly, it’s a pretty grim run for this spot. The water is sitting at 62.2° which is a touch warmer than normal for this time of year, but that’s about the only thing going for it.
The whole 16-day stretch is one long flat spell with nothing worth paddling out for. From August 6th all the way through to August 21st, every single session is marked as poor surf conditions. There’s no standout, no hidden gem, just a whole lot of nothing. The combined wave energy is always weak, with values mostly below 100 – like 78 on the morning of the 6th, and then it drops into single digits for days on end. It’s not just small, it’s tiny.
The winds are mostly cross-on or onshore, often moderate to fresh breezes, which just chop up what little bump there is. Even the few periods with clean wind – like the afternoons of the 16th and 17th – only have swell heights of 2.3ft and 1.0ft respectively. That’s not surf, that’s a ripple. The swell periods are short, often 4 to 6 seconds, with no energy behind them.
For a spot that’s already inconsistent and exposed to SW swell, this is a proper blank run. It’s more normal here to have quiet spells like this. If you’re desperate for a paddle, the cleanest conditions will be late on the 16th and 17th, but you’ll be bobbing around on next to nothing. Honestly, the whole setup looks more interesting for kite surfing than paddle surfing given the persistent cross-onshore winds and tiny swell.
No standouts here, folks. Keep your gear in the shed and wait for the next system.
Short Range ForecastMostly dry. Very mild (max 17°C on Fri afternoon, min 13°C on Thu morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 21°C on Tue afternoon, min 16°C on Sun morning). Wind will be generally light. | ||||||||||||||||||||
Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | |||||||||||||||
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) | NW 5 | SW 6 | SSW 4 | SW 4 | SW 5 | SSW 4 | SSW 4 | SSW 4 | SSW 4 | SW 4 | SW 6 | SSW 6 | SSW 6 | SSW 6 | SW 6 | SW 6 | SSW 3 | SSW 3 | SSW 4 | SSW 4 | SW 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 66 | 5 | 16 | 6 | 5 | 12 | 15 | 10 | 9 | 7 | 7 | 4 | 4 | 4 | 1 | 1 | 2 | 6 | 11 | 14 | 42 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | on | on | cross-on | cross-on | on | cross-on | cross-on | on | cross-on | cross | cross | off | on | on | cross-on | cross-on | cross-on | on |
High Tide | 4:26PM4.70m | 4:55AM4.80m | 5:37PM4.56m | 6:16AM4.64m | 7:05PM4.57m | 7:47AM4.68m | 8:27PM4.80m | 9:03AM4.91m | 9:30PM5.16m | 10:01AM5.19m | 10:21PM5.51m | 10:50AM5.42m | 11:07PM5.78m | ||||||||
Low Tide | 10:13AM1.46m | 10:41PM1.77m | 11:18AM1.72m | 11:58PM1.91m | 12:38PM1.85m | 1:25AM1.83m | 1:59PM1.77m | 2:41AM1.51m | 3:06PM1.52m | 3:41AM1.10m | 4:01PM1.21m | 4:33AM0.72m | 4:48PM0.94m | ||||||||
 | |  | | |  | |  | | | | | | | |  | | | | | | |
 | 5:41 | — | — | 5:43 | — | — | 5:45 | — | — | 5:47 | — | — | 5:48 | — | — | 5:50 | — | — | 5:52 | — | — |
 | — | — | 9:05 | — | — | 9:02 | — | — | 9:00 | — | 8:59 | — | — | 8:57 | — | — | 8:54 | — | — | 8:52 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 15 | 16 | 15 | 17 | 16 | 16 | 17 | 16 | 17 | 19 | 19 | 17 | 19 | 18 | 20 | 21 | 19 | 19 | 20 | 18 |
Feels °C | 10 | 12 | 12 | 13 | 13 | 12 | 12 | 13 | 12 | 15 | 18 | 20 | 16 | 18 | 16 | 18 | 18 | 16 | 15 | 17 | 15 |
Swell 1 Height (m) Direction Period (s) | SW 6 | NNW 5 | SSW 4 | SW 4 | WNW 3 | SW 12 | SW 11 | S 11 | S 11 | SW 6 | SW 3 | SSW 6 | SSW 6 | SSW 6 | SW 6 | SW 6 | SW 6 | S 11 | SW 12 | SW 10 | SW 5 |
| kJ | 9 | 13 | 12 | 5 | 1 | 5 | 5 | 2 | 2 | 2 | 2 | 4 | 4 | 4 | 1 | 1 | 1 | 2 | 6 | 4 | 42 |
Swell 2 Height (m) Direction Period (s) | S 13 | SW 6 | N 4 | NW 3 | S 12 | — | — | — | S 11 | S 12 | SW 6 | S 12 | — | — | — | — | — | SW 11 | W 10 | SW 12 | SW 8 |
| kJ | 3 | 5 | 2 | 3 | 3 | — | — | — | 2 | 3 | 7 | 3 | — | — | — | — | — | 5 | 2 | 6 | 3 |
Swell 3 Height (m) Direction Period (s) | — | NW 4 | SW 12 | SW 12 | S 6 | — | — | — | — | — | SW 12 | — | — | — | — | — | — | — | SW 6 | — | — |
| kJ | — | 1 | 6 | 6 | 1 | — | — | — | — | — | 6 | — | — | — | — | — | — | — | 1 | — | — |
Wind waves Height (m) Direction Period (s) | NW 5 | WSW 4 | SW 4 | — | SW 5 | SSW 4 | SSW 4 | SSW 4 | SSW 4 | SW 4 | — | — | WNW 2 | — | — | — | SSW 3 | SSW 3 | SSW 4 | SSW 4 | — |
| kJ | 66 | 4 | 16 | — | 5 | 12 | 15 | 10 | 9 | 7 | — | — | 1 | — | — | — | 2 | 6 | 11 | 14 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 278 | 284 | 273 | 280 | 251 | 246 | 246 | 246 | 246 | 250 | 246 | 252 | 246 | 249 | 249 | 286 | 288 | 241 | 280 | 273 | 88 |
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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