Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 30 Jul 2026:
- Most powerful swell: Saturday 1 Aug, 4AM (local time) - 2.5ft (0.7m), 4s period, NW swell with 16 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 0.7m 4s and forecast to arrive on Saturday (Aug 01) at 4AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Tuesday (Aug 04) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4AM (Sat 1st Aug) | 2.5ft (0.7m) 4s |
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 Trearddur Bay (Holy Island) has got cookin' for us over the next couple of weeks.
Straight up, I gotta be honest with you – it's a tough outlook. We're looking at a long, dry spell with hardly any surf worth paddling out for. The whole first week is basically a write-off, with tiny, weak swells and poor conditions. The water is a touch warmer than normal for this time of year, sitting at 62°, but that's small comfort when the waves are flat.
From Thursday 30th July right through to the morning of Saturday 8th August, we're stuck in the doldrums. Swell heights barely crack 2ft, the combined energy is a measly 5 or so, and when it's not cross-onshore and choppy, it's a glassy flatness. There's a few clean moments on Sunday 2nd and Monday 3rd, but with a 0.3ft swell, you're better off finding a rock pool. The period is short and snappy, mostly around 4 to 8 seconds, offering no real push.
The only glimmer of hope, and I mean the *only* standout, is the afternoon of Saturday 8th August. The swell bumps up to 6ft from the SSW with a combined energy of 216, which is our first moderate energy in the whole forecast. The cross-offshore wind from the NNW means it'll be clean. That's the best we've got. But here's the catch – at 6ft, it's getting a bit sizey for beginners, and the 6-second period is super short. That means it'll be a bit fat and dumpy, not a classic long wall. It's a beach break, so with that short period, it could be a bit of a washout. If you're a kitesurfer, this might be your window.
After that, Sunday 9th August morning has a 4ft, clean swell, but it's still a short 7-second period. The energy is moderate (136), but it's hardly a barnstormer. The rest of the second week fades right back out to ankle-biters.
So, to sum it up: if you absolutely have to get wet, aim for the Saturday 8th and Sunday 9th of August. The Saturday afternoon is the pick of the bunch, but keep your expectations low. It's a long stretch of flat water until then. The forecasts can change, so don't give up hope, but for now, the board's staying in the van.
Rusty.
Short Range ForecastMostly dry. Very mild (max 17°C on Fri afternoon, min 13°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 21°C on Mon afternoon, min 16°C on Sun night). Wind will be generally light. | |||||||||||||||||||
Thu 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | ||||||||||||||
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) | NW 4 | WSW 3 | W 4 | SW 3 | SSW 5 | WNW 4 | W 4 | SW 3 | SW 4 | W 9 | SW 8 | SW 9 | SW 9 | SW 8 | SW 8 | SW 8 | SSW 7 | SW 7 | SSW 7 | SW 6 |
Wave Graph  | ||||||||||||||||||||
 kJ | 3 | 3 | 7 | 3 | 15 | 10 | 7 | 3 | 2 | 2 | 3 | 3 | 3 | 11 | 10 | 9 | 5 | 7 | 4 | 7 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | on | cross-on | cross-on | on | cross-on | cross-off | cross-off | off | cross-off | off | cross-off | cross-off | glassy | on | on | on | cross |
High Tide | 00:03AM5.49m | 12:26PM5.10m | 00:36AM5.52m | 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 | |||||||
Low Tide | 5:50PM1.23m | 6:14AM0.99m | 6:23PM1.15m | 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 | |||||||
 |  | |  | | | |  |  | |  | | | | | | | | | | |
 | — | — | 5:31 | — | — | 5:33 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — |
 | — | 9:17 | — | — | 9:15 | — | — | 9:14 | — | — | 9:12 | — | — | 9:10 | — | — | 9:08 | — | — | 9:07 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 16 | 14 | 17 | 16 | 13 | 15 | 15 | 17 | 17 | 18 | 19 | 21 | 21 | 19 | 21 | 20 | 18 | 19 | 18 |
Feels °C | 13 | 14 | 11 | 13 | 13 | 9 | 12 | 12 | 16 | 15 | 14 | 14 | 16 | 15 | 18 | 20 | 18 | 17 | 18 | 18 |
Swell 1 Height (m) Direction Period (s) | NW 4 | — | — | WNW 3 | SSW 5 | SW 5 | NW 4 | — | SW 4 | SW 4 | SW 8 | NNE 3 | SW 9 | SW 8 | SW 8 | SW 8 | NE 5 | NE 4 | SSW 7 | SW 6 |
| kJ | 3 | — | — | 1 | 15 | 6 | 5 | — | 2 | 1 | 3 | 1 | 3 | 11 | 10 | 9 | 14 | 3 | 4 | 7 |
Swell 2 Height (m) Direction Period (s) | SSW 5 | — | — | — | — | — | SW 5 | — | — | W 9 | — | SW 9 | — | — | NE 5 | — | SSW 7 | SW 7 | NNE 4 | — |
| kJ | 2 | — | — | — | — | — | 3 | — | — | 2 | — | 3 | — | — | 1 | — | 5 | 7 | 1 | — |
Swell 3 Height (m) Direction Period (s) | N 4 | — | — | — | — | — | — | W 9 | — | — | — | — | — | — | — | — | — | — | S 13 | SW 13 |
| kJ | 1 | — | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | 3 | 7 |
Wind waves Height (m) Direction Period (s) | — | WSW 3 | W 4 | SW 3 | WNW 3 | WNW 4 | W 4 | SW 3 | — | — | NE 3 | ESE 2 | NE 4 | NE 4 | ENE 5 | NE 5 | — | — | — | — |
| kJ | — | 3 | 7 | 3 | 6 | 10 | 7 | 3 | — | — | 2 | 1 | 2 | 9 | 14 | 17 | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 587 | 246 | 292 | 586 | 278 | 407 | 368 | 246 | 246 | 285 | 163 | 179 | 179 | 163 | 241 | 287 | 303 | 287 | 287 | 281 |
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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