Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 9 Aug 2026:
- Most powerful swell: Friday 14 Aug, 4AM (local time) - 2ft (0.6m), 5s period, SW swell with 17 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 5s and forecast to arrive on Friday (Aug 14) at 4AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Saturday (Aug 15) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4AM (Fri 14th Aug) | 2ft (0.6m) 5s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Right then, let’s have a look at what’s on the cards for Trearddur Bay on Holy Island.
To be straight with you, the next couple of weeks are looking pretty quiet. We’ve got a long stretch of very small, often flat waves, and the conditions aren’t doing us any favours. The first real chance of anything rideable doesn’t turn up until Friday the 21st of August. Before that, you’re looking at a lot of days with nothing doing—just tiny, un-rideable bumps. The water temp is sitting at 62°, which is a touch warmer than normal for this time of year, so at least it won’t be freezing while you’re waiting.
Now, if you’re desperate for a paddle, the best we’ve got in this whole outlook is around Friday the 21st of August. Trearddur Bay (Holy Island) picks up a bit of swell from the WNW at 4ft, with a short period of 5 seconds. The combined energy is moderate at 96, so it’s got a little bit of push. The wind will be from the east at 12 mph, which is cross-offshore, keeping things clean. It’s not going to be a classic, but it’s the only window that’s even worth mentioning. This spot is a fairly exposed beginner’s break, but it’s inconsistent, so don’t expect it to be pumping. Crowds are possible here at times, so you might have some company.
After that, the surf fades right back out again. The following days just have tiny leftover pulses and clean but flat conditions. It’s a proper dry spell for the area.
Rusty.
Short Range ForecastSome drizzle, heaviest during Sun night. Warm (max 22°C on Wed morning, min 13°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Thu night. Warm (max 23°C on Wed afternoon, min 13°C on Sat morning). Wind will be generally light. | |||||||||||||||||||
Sun 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | ||||||||||||||
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) | SW 12 | SSW 4 | SW 6 | SW 6 | SSW 6 | SSW 6 | SW 6 | S 11 | SW 12 | SW 12 | SW 10 | SW 11 | SW 11 | SW 4 | WNW 4 | NW 4 | SW 6 | W 8 | SW 7 | SW 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 6 | 7 | 8 | 5 | 4 | 4 | 1 | 2 | 5 | 6 | 4 | 5 | 4 | 16 | 10 | 7 | 2 | 1 | 2 | 2 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-off | cross-off | cross-off | off | cross-on | on | cross-on | cross-on | on | cross-on | cross-on | cross | cross-on | cross | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 8:27PM4.80m | 9:03AM4.91m | 9:30PM5.16m | 10:01AM5.19m | 10:21PM5.51m | 10:50AM5.42m | 11:07PM5.78m | 11:35AM5.56m | 11:49PM5.94m | 12:16PM5.58m | 00:30AM5.96m | 12:56PM5.52m | 1:10AM5.85m | |||||||
Low Tide | 2:41AM1.51m | 3:06PM1.52m | 3:41AM1.10m | 4:01PM1.21m | 4:33AM0.72m | 4:48PM0.94m | 5:19AM0.45m | 5:32PM0.74m | 6:02AM0.32m | 6:14PM0.67m | 6:44AM0.35m | 6:54PM0.71m | ||||||||
 |  |  | |  | | | | | |  | | | | | | |  | | | |
 | — | — | 5:48 | — | — | 5:50 | — | — | 5:52 | — | — | 5:54 | — | — | 5:54 | — | — | 5:56 | — | — |
 | 8:59 | — | — | 8:57 | — | — | 8:54 | — | — | 8:52 | — | — | 8:51 | — | — | 8:49 | — | — | 8:46 | — |
mm | — | 1 | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — |
Temp °C | 18 | 14 | 14 | 16 | 16 | 20 | 21 | 21 | 22 | 23 | 22 | 22 | 23 | 22 | 17 | 18 | 16 | 14 | 15 | 14 |
Feels °C | 16 | 10 | 12 | 13 | 12 | 17 | 18 | 19 | 19 | 20 | 20 | 22 | 24 | 23 | 15 | 16 | 13 | 9 | 10 | 10 |
Swell 1 Height (m) Direction Period (s) | — | SSW 4 | SW 6 | SW 6 | SSW 6 | SSW 6 | SW 6 | SSW 3 | SW 12 | SW 12 | SW 10 | SW 8 | SW 8 | SW 8 | SW 4 | SW 5 | SW 5 | SW 5 | SW 5 | SW 7 |
| kJ | — | 7 | 8 | 5 | 4 | 4 | 1 | 1 | 5 | 6 | 4 | 3 | 2 | 2 | 4 | 3 | 1 | 1 | 1 | 2 |
Swell 2 Height (m) Direction Period (s) | SW 12 | SW 12 | S 8 | — | — | — | — | SW 6 | SW 6 | S 6 | SW 5 | SW 5 | SW 11 | S 11 | SW 7 | — | SW 6 | W 8 | SW 7 | — |
| kJ | 6 | 6 | 1 | — | — | — | — | 1 | 1 | 1 | 1 | 1 | 4 | 2 | 2 | — | 2 | 1 | 2 | — |
Swell 3 Height (m) Direction Period (s) | — | SW 12 | — | — | — | — | — | S 11 | W 10 | SW 6 | — | SW 11 | W 11 | — | — | — | — | — | — | — |
| kJ | — | 6 | — | — | — | — | — | 2 | 2 | 1 | — | 5 | 2 | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 3 | N 3 | NNW 4 | N 4 | ENE 2 | SSE 3 | — | — | SSW 3 | SSW 3 | — | SSW 3 | SW 3 | SW 4 | WNW 4 | NW 4 | N 4 | N 5 | NNW 5 | N 5 |
| kJ | 4 | 3 | 5 | 3 | 1 | 1 | — | — | 3 | 2 | — | 1 | 1 | 16 | 10 | 7 | 4 | 59 | 35 | 42 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 548 | 251 | 251 | 276 | 246 | 284 | 306 | 184 | 161 | 186 | 178 | 179 | 287 | 192 | 192 | 326 | 192 | 318 | 565 | 318 |
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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