Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 27 Jul 2026:
- Most powerful swell: Tuesday 28 Jul, 7PM (local time) - 4.5ft (1.3m), 5s period, SSW swell with 94 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 1.3m 5s and forecast to arrive on Tuesday (Jul 28) at 7PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s 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 | 7PM (Tue 28th Jul) | 4.5ft (1.3m) 5s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let’s chew the fat on what’s coming for our local waters.
I’m not gonna sugarcoat it – this is a rough forecast. The whole 16-day window is mostly flat and ugly, with a big, messy spike at the end that’s a kite surfer’s dream but a surfer’s nightmare.
The first run is a proper drought. From Monday 27 July through the end of the month, the swell is tiny and weak, with energy readings between 7 and 44 (weak). The wind is a constant problem, blowing hard from the SSW onshore or cross-onshore, chopping up any hint of a wave. The 3ft to 4ft swell on Tuesday 28 July is a mess.
The first week of August gets even flatter. Energy readings drop to 3 and 2. The wind does turn offshore from the NE, but the swell is only 0.3ft to 1ft. There are a few glassy hours on the 6th and 7th, but no swell to surf. It’s a real tease.
Then, on Saturday 8 August, we get a pulse. The swell jumps to 6ft from the W, with a period of 6 seconds, and the wave energy hits 220 (moderate). The wind is a strong cross-onshore from the SSE, which will make Trearddur Bay (Holy Island) a lumpy, choppy mess. The water is a touch warmer than normal at 62°F.
Sunday 9 August sees the biggest swell of the run, with 7ft from the WNW and energy at 299. But the wind is screaming onshore at 25 mph from the SSW. That’s a washing machine. At 7ft, only experts should even think about it, and with that wind, it’s a no-go.
The date 10 August and beyond, the swell just dies. We’re left with flat, choppy seas and strong winds.
So, what’s the best? There is no standout. The whole setup on the 8th and 9th looks more interesting for kite surfing than paddle surfing. If you’re absolutely dying to get wet, the glassy morning of Thursday 6 August might give you a knee-high, clean ripple, but you’ll be waiting forever for a set.
This is a tough one. The inconsistency is normal for this area, but it doesn’t make it any easier. Keep an eye on the forecast – it never stays this bad for long.
Rusty.
Short Range ForecastMostly dry. Very mild (max 19°C on Mon afternoon, min 14°C on Wed night). Winds decreasing (fresh winds from the SSW on Tue afternoon, light winds from the WNW by Wed night). | Days 5-7 Weather SummaryMostly dry. Very mild (max 17°C on Fri night, min 13°C on Thu night). Winds increasing (calm on Thu afternoon, fresh winds from the SSW by Fri afternoon). | |||||||||||||||||||
Mon 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | ||||||||||||||
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 4 | SW 4 | SSW 5 | SSW 5 | SW 5 | SSW 4 | SSW 4 | SW 5 | W 4 | NW 4 | SW 4 | WSW 3 | SW 4 | SW 5 | W 4 | W 4 | SW 3 | NW 3 | WNW 3 | — |
Wave Graph  | ||||||||||||||||||||
 kJ | 31 | 17 | 44 | 77 | 57 | 22 | 28 | 24 | 22 | 9 | 6 | 7 | 15 | 23 | 15 | 9 | 1 | 2 | 1 | 0 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-off | on | on | on | cross-on | cross-on | on | cross | cross | cross-off | cross-off |
High Tide | 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 | 1:32PM5.12m | 1:43AM5.48m | |||||||
Low Tide | 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 | 7:20AM0.89m | 7:31PM1.14m | |||||||
 |  |  | | | | |  |  | | | | | | | | | | | | |
 | — | — | 5:26 | — | — | 5:28 | — | — | 5:30 | — | — | 5:31 | — | — | 5:33 | — | — | 5:35 | — | — |
 | — | 9:22 | — | — | 9:21 | — | — | 9:19 | — | — | 9:17 | — | — | 9:15 | — | — | 9:14 | — | — | 9:12 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 18 | 18 | 18 | 17 | 17 | 17 | 15 | 15 | 15 | 16 | 14 | 16 | 17 | 14 | 15 | 16 | 13 | 16 | 15 |
Feels °C | 17 | 16 | 14 | 13 | 13 | 13 | 12 | 14 | 11 | 12 | 13 | 10 | 11 | 13 | 10 | 10 | 14 | 10 | 14 | 12 |
Swell 1 Height (m) Direction Period (s) | NNW 4 | — | — | — | — | — | — | SW 5 | — | NW 4 | SW 4 | — | WNW 4 | SW 5 | SW 5 | NW 4 | SW 3 | SW 4 | SW 4 | — |
| kJ | 2 | — | — | — | — | — | — | 24 | — | 9 | 6 | — | 1 | 23 | 9 | 3 | 1 | 1 | 1 | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | SW 4 | NNW 4 | — | — | — | — | — | — | — | SW 4 | — |
| kJ | — | — | — | — | — | — | — | — | — | 6 | 2 | — | — | — | — | — | — | — | 1 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 4 | SW 4 | SSW 5 | SSW 5 | SW 5 | SSW 4 | SSW 4 | — | W 4 | — | — | WSW 3 | SW 4 | WNW 3 | W 4 | W 4 | WNW 3 | NW 3 | WNW 3 | — |
| kJ | 31 | 17 | 44 | 77 | 57 | 22 | 28 | — | 22 | — | — | 7 | 15 | 1 | 15 | 9 | 1 | 2 | 1 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 235 | 246 | 251 | 288 | 246 | 278 | 246 | 246 | 548 | 586 | 251 | 358 | 368 | 292 | 356 | 781 | 415 | 311 | 292 | 249 |
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