Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 1 Aug 2026:
- Most powerful swell: Wednesday 5 Aug, 4AM (local time) - 3.5ft (1.0m), 6s period, SSW swell with 68 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 6s and forecast to arrive on Wednesday (Aug 05) 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 0.7m 4s period and expected on Thursday (Aug 06) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4AM (Wed 5th Aug) | 3.5ft (1.0m) 6s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's on the cards for Trearddur Bay (Holy Island).
Honestly, it's a tough one. Looking at the whole 16-day window, the dominant story is small, wind-affected swell. The combined energy barely breaks into double digits for most of the run, with values like 11 and 7 showing weak, small waves. We're looking at a long quiet spell, about a week and a half of nothing really worth getting wet for. The first promising sign doesn't show up until *Tuesday the 11th of August*, and even then, it's a mixed bag.
The water temperature is about average for the time of year, nothing weird there.
The one real standout, if you can call it that, is a brief pulse on the Tuesday the 11th of August. The swell bumps up to about 5ft from the SSW with a period of 6 seconds, and the combined energy hits 156 (moderate). That’s the biggest we’ll see. The problem is the wind is a moderate cross-onshore from the SSW at 12 mph, which will make it choppy. It's a bit of a messy one. For a beginner, 5ft is pushing the limit, especially with that onshore wind. The break is inconsistent, so don't expect a set every few minutes.
Before that, on Wednesday the 5th of August, we get a tiny spike of 3ft from the SSW with a light onshore wind. The energy is only 51, so it's weak. The light wind might make it surfable for a longboard on the right tide, but it’s nothing to write home about.
After that Tuesday the 11th, the wind gets stronger, and the waves drop right back off again. The rest of the second week is plagued by fresh to strong breezes, making the conditions pretty lumpy and messy for paddle surfing. With that strong wind and the bigger, but poor quality swell, it might be more of a kite surfing setup than anything else.
Look, it’s a bleak run for Trearddur Bay. Forecasts can change, and it’s a fairly exposed spot, so if the wind swings, it could come good, but based on this, I’d be keeping the board in the van.
Rusty.
Short Range ForecastMostly dry. Very mild (max 19°C on Mon afternoon, min 13°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 7mm), mostly falling on Tue morning. Very mild (max 19°C on Tue afternoon, min 14°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | |||||||||||||||
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) | SW 5 | SW 5 | SW 4 | SSW 4 | SW 9 | SW 8 | SW 9 | WSW 8 | SW 8 | SW 8 | SW 7 | SSW 5 | SSW 6 | SW 7 | SW 7 | SSW 7 | SW 6 | SW 6 | SSW 6 | SSW 6 | SW 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 6 | 3 | 3 | 3 | 3 | 3 | 3 | 7 | 11 | 10 | 9 | 55 | 51 | 37 | 50 | 40 | 20 | 9 | 6 | 3 | 5 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-off | cross-off | off | cross-off | cross | cross-off | glassy | cross-on | cross-on | on | cross-on | cross | cross | cross-on | cross-on | on | on | on |
High Tide | 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 | 4:26PM4.70m | 4:55AM4.80m | 5:37PM4.56m | ||||||||
Low Tide | 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 | 10:13AM1.46m | 10:41PM1.77m | 11:18AM1.72m | 11:58PM1.91m | |||||||
 | |  |  |  | | | |  |  | |  |  | | | | | | | | | |
 | 5:33 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:41 | — | — | 5:43 | — | — |
 | — | — | 9:14 | — | — | 9:12 | — | — | 9:10 | — | — | 9:08 | — | — | 9:07 | — | — | 9:05 | — | — | 9:02 |
mm | — | — | — | — | — | — | — | — | 1 | 4 | — | — | 2 | — | — | — | — | — | — | — | — |
Temp °C | 13 | 15 | 15 | 16 | 17 | 17 | 18 | 19 | 18 | 17 | 19 | 18 | 17 | 17 | 15 | 14 | 15 | 16 | 15 | 16 | 16 |
Feels °C | 10 | 12 | 13 | 14 | 15 | 14 | 17 | 17 | 16 | 15 | 17 | 15 | 16 | 16 | 14 | 10 | 13 | 13 | 14 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | SW 5 | NW 3 | SW 4 | SSW 4 | — | SW 8 | NE 5 | NNE 4 | NE 4 | NE 4 | SW 7 | NE 4 | SSW 6 | SSW 6 | SW 7 | SSW 7 | NNW 5 | SW 6 | N 4 | N 4 | SW 5 |
| kJ | 5 | 2 | 3 | 1 | — | 3 | 6 | 2 | 5 | 3 | 9 | 1 | 51 | 37 | 50 | 40 | 17 | 9 | 3 | 1 | 1 |
Swell 2 Height (m) Direction Period (s) | — | W 9 | — | SW 8 | SW 9 | — | SW 9 | WSW 8 | SW 8 | SW 8 | — | — | — | S 13 | SW 13 | S 13 | SW 6 | SW 12 | SSW 6 | SSW 6 | SW 12 |
| kJ | — | 2 | — | 3 | 3 | — | 3 | 7 | 11 | 10 | — | — | — | 3 | 7 | 3 | 20 | 6 | 3 | 3 | 5 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | NW 4 | — | — | — | — | — | — | — | — | — | S 12 | — | SW 12 | S 12 | SW 8 |
| kJ | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | 3 | — | 6 | 3 | 2 |
Wind waves Height (m) Direction Period (s) | WNW 4 | SW 5 | — | — | — | NNE 3 | — | N 3 | — | — | NE 4 | SSW 5 | — | SW 7 | — | NNW 4 | NW 5 | N 4 | — | — | NNE 4 |
| kJ | 6 | 3 | — | — | — | 4 | — | 1 | — | — | 2 | 55 | — | 35 | — | 19 | 5 | 9 | — | — | 8 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 357 | 368 | 246 | 246 | 249 | 163 | 161 | 192 | 163 | 219 | 303 | 281 | 51 | 51 | 179 | 192 | 351 | 358 | 285 | 350 | 184 |
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)
Latest Updates
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