Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 26 Jul 2026:
- Best quality surf: Sunday 2 Aug, 4AM (local time) - 3.5ft (1.1m), 6s period, SSW swell with offshore winds.
- Most powerful swell: Sunday 26 Jul, 10AM (local time) - 5ft (1.6m), 6s period, WNW swell with 166 kJ wave energy.
- Next surfable swell (1★+): Sunday 2 Aug, 4AM (local time) - 3.5ft (1.1m), 6s period with SSW swell.
Best Forecast Surf Conditions for Trearddur Bay (Holy Island) this week:
The surf forecast for Trearddur Bay (Holy Island) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Aug 02) at 4AM. The primary swell is predicted to be 1.1m and 6s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Trearddur Bay (Holy Island) in the next 16 days are 1.6m 6s and forecast to arrive on Sunday (Jul 26) at 10AM. 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 Monday (Jul 27) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Sun 2nd Aug) | 3.5ft (1.1m) 6s |
| Best Surf | 4AM (Sun 2nd Aug) | 3.5ft (1.1m) 6s |
| Most Powerful | 10AM (Sun 26th Jul) | 5ft (1.6m) 6s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright, Rusty here again, switching to feet and inches for the imperial crew. We've got a full 16-day window ahead for Trearddur Bay (Holy Island), and I've got to level with you... it's dead. Absolutely flat. Not a single session worth paddling for. Every check in the data is poor.
In the early days around July 26th, we see some chest-high swell pushing 5 feet, but an onshore gale from the WNW at 22 mph makes it a washing machine. Lumpy, cross-onshore chop. The wave energy starts at 191 (moderate), but the wind is a dealbreaker. After that, it's all downhill.
From July 27th through to August 10th, we are in a full-on drought. Swell heights barely hit 3 feet, and most days they're below 2 feet. The wave energy is pathetic – single and low double digits (18, 32, 3, 2... hopeless). Wave periods are short, under 8 seconds, so there's no push or shape. Even the clean, glassy mornings with a light offshore breeze, like on August 2nd, only offer knee-high dribble. There's a bump on August 5th with some 4-5 foot swell, but it comes with a heavy 28 mph onshore wind, turning the bay into a mess.
For a spot that's open to the SW, it's just not catching anything. Water temp is about average for the season, nothing wild there. But the surf... there is no highlight. There is nothing to recommend. This is a proper dry spell, and for this area, it happens. Don't force it.
Rusty
Short Range ForecastSome drizzle, heaviest during Sat night. Very mild (max 19°C on Mon night, min 14°C on Mon morning). Winds decreasing (fresh winds from the WNW on Sun morning, light winds from the SSW by Mon night). | Days 4-6 Weather SummaryMostly dry. Warm (max 21°C on Wed afternoon, min 13°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | |||||||||||||||
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 6 | WNW 6 | NW 5 | SW 4 | SW 5 | SW 6 | SSW 4 | SSW 5 | SSW 4 | SW 3 | SW 2 | SW 5 | WSW 4 | SW 4 | WNW 4 | SW 5 | SW 5 | SW 4 | S 3 | SSW 5 | SSW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 166 | 101 | 41 | 10 | 31 | 31 | 20 | 33 | 12 | 2 | 1 | 26 | 21 | 23 | 10 | 5 | 4 | 8 | 4 | 54 | 92 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | on | on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on | on | cross-on | cross-on | cross-on | on | glassy | cross | cross-on | cross-on |
High Tide | 9:25AM4.48m | 9:42PM4.82m | 10:10AM4.66m | 10:22PM5.05m | 10:47AM4.83m | 10:57PM5.25m | 11:21AM4.96m | 11:31PM5.40m | 11:54AM5.05m | 00:03AM5.49m | 12:26PM5.10m | 00:36AM5.52m | 12:58PM5.13m | 1:09AM5.52m | |||||||
Low Tide | 3:25PM1.90m | 3:54AM1.74m | 4:07PM1.71m | 4:33AM1.50m | 4:44PM1.52m | 5:08AM1.29m | 5:17PM1.36m | 5:41AM1.11m | 5:50PM1.23m | 6:14AM0.99m | 6:23PM1.15m | 6:46AM0.92m | 6:56PM1.12m | ||||||||
 |  |  | | |  | | | | | |  | | | | | | | |  | | |
 | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — | 5:28 | — | — | 5:30 | — | — | 5:31 | — | — | 5:33 | — | — |
 | — | — | 9:23 | — | — | 9:22 | — | — | 9:21 | — | — | 9:19 | — | — | 9:17 | — | — | 9:15 | — | — | 9:14 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 17 | 17 | 15 | 18 | 19 | 19 | 19 | 18 | 20 | 21 | 19 | 17 | 18 | 17 | 14 | 16 | 15 | 15 | 17 | 16 |
Feels °C | 9 | 13 | 12 | 11 | 16 | 18 | 15 | 16 | 15 | 19 | 20 | 17 | 15 | 15 | 12 | 12 | 13 | 13 | 12 | 15 | 13 |
Swell 1 Height (m) Direction Period (s) | SW 6 | SW 6 | SW 6 | NW 4 | WNW 4 | WNW 3 | — | — | SW 4 | WSW 3 | SW 4 | SW 5 | — | WNW 4 | SSW 4 | WNW 4 | WNW 3 | SW 4 | WSW 3 | — | SSW 6 |
| kJ | 25 | 24 | 5 | 10 | 1 | 1 | — | — | 6 | 1 | 1 | 26 | — | 1 | 7 | 5 | 1 | 2 | 1 | — | 55 |
Swell 2 Height (m) Direction Period (s) | — | — | — | NNW 5 | — | — | — | — | — | — | — | — | — | — | — | SW 5 | — | — | — | — | — |
| kJ | — | — | — | 5 | — | — | — | — | — | — | — | — | — | — | — | 5 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WNW 6 | WNW 6 | NW 5 | SW 4 | SW 5 | SW 6 | SSW 4 | SSW 5 | SSW 4 | SW 3 | SW 2 | — | WSW 4 | SW 4 | WNW 4 | — | SW 5 | SW 4 | S 3 | SSW 5 | SSW 6 |
| kJ | 166 | 101 | 41 | 8 | 31 | 31 | 20 | 33 | 12 | 2 | 1 | — | 21 | 23 | 10 | — | 4 | 8 | 4 | 54 | 92 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 565 | 548 | 289 | 246 | 250 | 246 | 251 | 246 | 249 | 275 | 249 | 249 | 317 | 234 | 323 | 241 | 249 | 246 | 210 | 53 | 8 |
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)
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