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), 5s period, SSW swell with 106 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 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 0.7m 4s period and expected on Friday (Jul 31) at 4AM.
| 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) 5s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Right then, I’m not gonna sugar-coat this one: the next 16 days for Trearddur Bay (Holy Island) are looking bleak for a paddle. The whole period is a long stretch of flat-to-ankle slop with almost no usable swell energy. From Monday the 27th of July right through to the middle of August, every single day is marked as poor surf conditions. There’s a small bump around Wednesday the 9th of August and Thursday the 10th, but even then we’re talking tiny wave heights and onshore or cross-onshore winds.
The first couple of days have a little more size, but it comes with strong onshore winds and a combined swell energy that barely cracks 80 (moderate wave energy) at its best – most days sit in the single or low double digits, which is weak. The swell period is short, usually 4–5 seconds, so it’s just wind chop, no shape. Water temp on the 27th morning is 62°F, which is a touch warmer than normal for the time of year – nothing wild, but a little extra warmth in the water.
The only faint glimmer comes right at the end, on Monday the 10th of August morning. The wind turns cross-offshore from the NNW at 9 mph, giving clean conditions, with a 2ft swell from the SSW, period of 7 seconds – still short-period, but at least the surface will be clean. Combined energy is 34, still in the weak range. Not really worth a trip by itself, but if you’re desperate for a float, it’s the least messy window. Even then, the break is inconsistent and often crowded when there’s any ripple, so don’t expect empty waves.
Honestly, unless you’re a beginner who just wants to bob around in ankle-biters, there’s nothing here to get excited about. The setup looks more interesting for kite surfing than paddle surfing on the few days when the wind is strong cross-onshore. If you’re set on a surf, keep an eye on forecasts – it tends not to stay this poor forever. But as it stands, there’s no stand-out day in this 16-day window.
Rusty
Short Range ForecastMostly dry. Very mild (max 19°C on Mon afternoon, min 13°C on Wed night). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Very mild (max 17°C on Thu afternoon, min 12°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
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) | WNW 4 | SW 4 | SW 5 | SSW 4 | SSW 5 | SW 5 | SW 4 | SSW 4 | SW 5 | W 4 | SW 4 | SSW 5 | SW 5 | WNW 3 | SW 4 | NW 3 | NW 3 | — | — | N 3 | N 3 |
Wave Graph  | |||||||||||||||||||||
 kJ | 8 | 31 | 18 | 30 | 80 | 60 | 18 | 8 | 30 | 22 | 15 | 9 | 3 | 2 | 4 | 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 | cross-on | cross-on | cross-on | cross | cross-on | on | cross | cross-on | on | cross-on | cross-off | 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 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 19 | 19 | 18 | 18 | 17 | 17 | 18 | 17 | 15 | 17 | 15 | 14 | 15 | 17 | 14 | 16 | 16 | 15 | 16 | 16 |
Feels °C | 11 | 17 | 17 | 13 | 13 | 13 | 14 | 14 | 16 | 12 | 14 | 11 | 10 | 10 | 14 | 11 | 12 | 13 | 12 | 12 | 13 |
Swell 1 Height (m) Direction Period (s) | WNW 4 | N 4 | WNW 3 | — | — | — | — | — | SW 5 | — | WNW 4 | SSW 5 | SW 5 | NNW 4 | SW 4 | SSW 4 | SW 4 | — | — | — | — |
| kJ | 8 | 2 | 1 | — | — | — | — | — | 30 | — | 1 | 9 | 3 | 3 | 4 | 1 | 1 | — | — | — | — |
Swell 2 Height (m) Direction Period (s) | NNW 5 | — | — | — | — | — | — | — | — | — | — | — | — | WNW 3 | — | WNW 3 | — | — | — | — | — |
| kJ | 7 | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | 1 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 4 | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 4 | SW 4 | SW 5 | SSW 4 | SSW 5 | SW 5 | SW 4 | SSW 4 | — | W 4 | SW 4 | NW 4 | NW 4 | — | — | NW 3 | NW 3 | — | — | N 3 | N 3 |
| kJ | 4 | 31 | 18 | 30 | 80 | 60 | 18 | 8 | — | 22 | 15 | 14 | 14 | — | — | 2 | 1 | — | — | 2 | 6 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 251 | 235 | 246 | 299 | 251 | 246 | 292 | 309 | 51 | 292 | 580 | 278 | 288 | 368 | 288 | 368 | 407 | 284 | 280 | 298 | 241 |
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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