Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 11 Jul 2026:
- Most powerful swell: Tuesday 14 Jul, 1PM (local time) - 0.5ft (0.1m), 18s period, SW swell with 12 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 0.1m 18s and forecast to arrive on Tuesday (Jul 14) at 1PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Sunday (Jul 12) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Tue 14th Jul) | 0.5ft (0.1m) 18s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
Right, folks. Rusty here. Let’s have a look at what’s cookin’ for Trearddur Bay (Holy Island). I’ll be straight with you – the next couple of weeks are a proper test of patience. There’s a long, barren stretch ahead, so don’t go waxing up just yet.
We’re looking at a 16-day window that starts off with a whole lot of nothing. For the first two weeks, the swell is barely a whisper. We’re talkin’ days on end of flat, poor surf conditions. From Saturday the 11th right through to Saturday the 25th of July, you’ll be hard-pressed to find a wave worth paddling for. The combined energy figures are all in the dumps, mostly single digits or zero (energy 0 to 13). It’s a real dry spell, and with the water temp sitting at 60°F for the start, that’s about 2°F warmer than usual for this time of year – a bit of a warm blanket on a flat ocean.
There is a tiny flicker of hope on Friday the 17th of July. The morning starts with glassy conditions, a light westerly breeze at 3 mph, and a little 1ft swell from the SW. The period is short, though – only 6 seconds – so it’s not gonna have much punch. Still, if you’re desperate, that’s the cleanest the water will look. The bay is fairly exposed to the SW, so it’s got the right direction, but the energy is weak (energy 13). It’s an inconsistent spot, so don’t expect a party.
The real standout, if you can call it one, arrives on Sunday the 26th of July. We finally see some life with a 5ft swell from the WNW, pushing the combined energy up to 136 (moderate wave energy). The wind is offshore from the NE at 16 mph, keeping things clean. The period is a short 6 seconds, so it’s a windswell, not a groundswell. This is the biggest swell on offer, but it’s right on that 5ft mark – still okay for most, but it’s only a one-day wonder. The morning looks best. For a break that’s inconsistent, this is notable.
The afternoon of the 26th drops back to 3ft and 58 energy, so the window is tight. The rest of the run is a washout. Honestly, if you’re a kite surfer, the windier, cleaner days mid-week might look more interesting than anything a paddle boarder can chase.
Forget the long-range stuff; it’s all a gamble from here. The second week holds nothing but flat spells. Keep your eyes on the 26th, and even then, don’t hold your breath.
Rusty.
Short Range ForecastMostly dry. Warm (max 24°C on Sun afternoon, min 14°C on Sun night). Winds increasing (light winds from the NNE on Sat afternoon, fresh winds from the ENE by Mon night). | Days 5-7 Weather SummaryMostly dry. Warm (max 29°C on Wed afternoon, min 19°C on Tue night). Winds decreasing (fresh winds from the NE on Tue afternoon, calm by Fri morning). | ||||||||||||||||||||
Sat 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | N 4 | NNW 4 | NE 5 | NE 4 | NE 5 | SE 4 | S 19 | S 15 | S 18 | SW 18 | SW 14 | SW 16 | SW 16 | SSW 7 | SSW 6 | SW 14 | SW 7 | SW 6 | SW 6 | SW 6 | SW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 0 | 0 | 1 | 7 | 4 | 6 | 12 | 7 | 10 | 10 | 7 | 4 | 8 | 12 | 10 | 10 | 10 | 9 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | off | off | cross-off | off | off | off | off | off | cross-off | off | off | cross-off | cross-off | cross-off | cross | glassy | cross-off | on | on |
High Tide | 8:33PM4.86m | 9:01AM5.02m | 9:34PM5.14m | 10:03AM5.23m | 10:28PM5.42m | 10:57AM5.41m | 11:18PM5.67m | 11:48AM5.52m | 00:06AM5.82m | 12:36PM5.53m | 00:52AM5.87m | 1:23PM5.44m | 1:37AM5.79m | ||||||||
Low Tide | 2:44AM1.43m | 3:11PM1.28m | 3:45AM1.10m | 4:08PM1.09m | 4:40AM0.77m | 4:59PM0.91m | 5:31AM0.52m | 5:47PM0.80m | 6:20AM0.38m | 6:34PM0.77m | 7:08AM0.38m | 7:20PM0.84m | 7:55AM0.51m | ||||||||
 |  |  | |  | | | | | | |  | | | | | | |  |  | | |
 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — | 5:11 | — | — | 5:11 |
 | — | 9:43 | — | — | 9:42 | — | — | 9:40 | — | — | 9:39 | — | — | 9:38 | — | — | 9:37 | — | — | 9:36 | 9:35 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | 1 | — |
Temp °C | 23 | 23 | 22 | 24 | 22 | 19 | 21 | 19 | 20 | 23 | 24 | 24 | 29 | 27 | 24 | 26 | 25 | 20 | 19 | 18 | 18 |
Feels °C | 22 | 20 | 18 | 18 | 17 | 12 | 15 | 12 | 16 | 18 | 18 | 21 | 24 | 23 | 23 | 22 | 20 | 20 | 19 | 19 | 18 |
Swell 1 Height (m) Direction Period (s) | — | NNW 4 | NNW 4 | — | — | SE 4 | S 19 | S 15 | S 18 | S 8 | SW 7 | — | SW 7 | NE 5 | NE 5 | SSW 6 | NE 4 | SW 6 | SW 6 | SW 6 | SW 6 |
| kJ | — | 16 | 3 | — | — | 1 | 7 | 4 | 6 | 1 | 2 | — | 2 | 13 | 8 | 3 | 5 | 10 | 10 | 10 | 9 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | SW 18 | SW 14 | S 6 | SE 4 | SSW 7 | SSW 6 | SW 14 | SW 7 | NNE 4 | NE 4 | — | N 3 |
| kJ | — | — | — | — | — | — | — | — | — | 12 | 7 | 1 | 1 | 4 | 4 | 8 | 12 | 2 | 1 | — | 1 |
Swell 3 Height (m) Direction Period (s) | — | — | NE 5 | — | — | — | S 15 | — | — | — | SW 14 | SW 16 | SW 16 | SW 13 | — | SW 8 | SW 12 | S 12 | SW 12 | SW 12 | SW 11 |
| kJ | — | — | 1 | — | — | — | 4 | — | — | — | 7 | 10 | 10 | 7 | — | 2 | 6 | 3 | 6 | 6 | 5 |
Wind waves Height (m) Direction Period (s) | N 4 | ENE 4 | NE 5 | NE 4 | NE 5 | NE 4 | NE 4 | NE 4 | NE 4 | NNE 4 | NE 6 | NE 5 | NE 5 | SE 4 | — | NNE 4 | — | — | — | — | — |
| kJ | 15 | 6 | 21 | 34 | 41 | 32 | 46 | 17 | 20 | 33 | 61 | 14 | 19 | 7 | — | 4 | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 255 | 249 | 287 | 208 | 305 | 415 | 284 | 286 | 184 | 208 | 288 | 306 | 208 | 304 | 184 | 347 | 219 | 326 | 326 | 326 | 611 |
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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