Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 27 Jul 2026:
- Most powerful swell: Tuesday 28 Jul, 7PM (local time) - 4.5ft (1.4m), 6s period, SW swell with 123 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 1.4m 6s 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 0.5m 3s period and expected on Sunday (Aug 02) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Tue 28th Jul) | 4.5ft (1.4m) 6s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright folks, it’s Rusty here, and I’ve gotta be straight with you – looking at Trearddur Bay on Holy Island for the next couple of weeks, it’s a tough read. The surf forecast is pretty much a write-off for the entire 16-day window. There just isn’t a single session that’s worth paddling out for.
We start off from Monday, 27 July, with a tiny 2ft windswell out of the west, but a stiff 12 mph SW wind is blowing straight onshore, making it a messy, poor surf scene. That sets the tone for the whole first week. The swell bumps up a touch on Tuesday, 28 July, hitting 5ft from the SSW, but the wind goes cross-onshore at 22 mph, and the combined energy is a paltry 106 (moderate wave energy). It’s lumpy, it’s ugly, and it’s not for surfing.
The rest of the week into the start of August is a desert. We’re looking at heights dropping to 0.3ft or even flat, with the odd glassy morning on Sunday, 2 August, but no swell to go with it. The water temp is sitting at 62°, which is a touch warmer than normal for the time of year, but that’s the only bit of good news.
There’s a long gap of nothing until we get to Saturday, 8 August, when a bit of a pulse shows up. The morning sees a 6ft swell from the WNW with a clean cross-offshore wind from the ENE at 12 mph, and the combined energy jumps to 178 (moderate wave energy). That’s the most promising-looking period in the whole run, but it’s still nothing special. The afternoon stays clean with a fresh offshore, but the swell drops to 4ft. For a spot that’s fairly exposed to SW swell, this WNW pulse is a bit off-angle, and it’s almost a week and a half away, so it’s a long-range hope.
Sunday, 9 August, hangs in there with a 4ft NW swell and clean winds, but by Monday, 10 August, we’re back to tiny dribble. For a break that’s inconsistent and best for beginners, it’s a real bummer. There’s nothing here for a surfer to get excited about. Keep checking back, though – it tends not to stay this poor for long, and forecasts can change.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Wed night. Very mild (max 18°C on Mon afternoon, min 14°C on Wed night). Winds decreasing (fresh winds from the SSW on Tue afternoon, calm by Wed night). | Days 4-6 Weather SummarySome drizzle, heaviest during Thu morning. Very mild (max 17°C on Thu afternoon, min 13°C on Thu night). Winds decreasing (fresh winds from the WNW on Thu night, calm by Sat night). | ||||||||||||||||||||
Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | |||||||||||||||
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) | W 4 | SW 4 | SW 5 | SSW 5 | SSW 5 | SW 5 | SW 4 | SSW 4 | SW 5 | W 4 | SSW 5 | SW 5 | SW 6 | SW 6 | SW 5 | SSW 5 | SW 5 | — | N 2 | NNW 3 | N 3 |
Wave Graph  | |||||||||||||||||||||
 kJ | 12 | 26 | 24 | 80 | 106 | 66 | 18 | 9 | 49 | 30 | 17 | 25 | 15 | 8 | 1 | 2 | 1 | 0 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | glassy | cross-on | cross-on | cross | cross-on | on | cross-on | cross-on | on | cross-on | glassy | cross-off | off |
High Tide | 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 | 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 | — | — | 5:26 | — | — | 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 | — | — | — | — | — | — | — | — | 4 | 1 | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 18 | 18 | 18 | 18 | 17 | 17 | 18 | 17 | 15 | 17 | 17 | 14 | 15 | 17 | 14 | 15 | 15 | 16 | 18 | 18 |
Feels °C | 11 | 15 | 16 | 13 | 13 | 13 | 14 | 15 | 14 | 13 | 13 | 14 | 10 | 10 | 13 | 10 | 11 | 11 | 15 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | NNW 5 | N 4 | — | — | — | — | — | — | — | SW 5 | NW 4 | SW 5 | SW 6 | SW 6 | SW 5 | SSW 5 | SW 5 | — | — | — | — |
| kJ | 8 | 2 | — | — | — | — | — | — | — | 24 | 4 | 25 | 15 | 8 | 1 | 2 | 1 | — | — | — | — |
Swell 2 Height (m) Direction Period (s) | NW 5 | — | — | — | — | — | — | — | — | — | — | — | WNW 4 | N 4 | — | — | — | — | — | — | — |
| kJ | 3 | — | — | — | — | — | — | — | — | — | — | — | 1 | 2 | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | W 3 | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | W 4 | SW 4 | SW 5 | SSW 5 | SSW 5 | SW 5 | SW 4 | SSW 4 | SW 5 | W 4 | SSW 5 | NW 4 | NW 3 | NNW 3 | — | — | NNW 3 | — | N 2 | NNW 3 | N 3 |
| kJ | 12 | 26 | 24 | 80 | 106 | 66 | 18 | 9 | 49 | 30 | 17 | 7 | 3 | 2 | — | — | 1 | — | 1 | 3 | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 251 | 235 | 246 | 299 | 251 | 246 | 249 | 285 | 219 | 288 | 287 | 565 | 307 | 517 | 307 | 565 | 312 | 303 | 278 | 285 | 249 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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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