Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 14 Jul 2026:
- Most powerful swell: Wednesday 15 Jul, 10AM (local time) - 0.5ft (0.1m), 16s period, SW swell with 10 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 16s and forecast to arrive on Wednesday (Jul 15) at 10AM. 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 6s period and expected on Saturday (Jul 18) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Wed 15th Jul) | 0.5ft (0.1m) 16s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s be straight with you – the outlook for Trearddur Bay (Holy Island) over the next 16 days is a tough one. There’s a long stretch of nothing to get excited about, and honestly, the waves are mostly flat or close to it.
We start off on Tuesday 14 July with a tiny 0.3ft swell from the SW, period a long 18 seconds, but with a NE wind at 15 mph. The combined energy is weak (12). That’s not enough to ride. The water temp is 61°F, which is a touch warmer than normal for the time of year.
Wednesday 15 July and Thursday 16 July are much the same story – 0.3ft swell, light offshore winds, but zero wave power. The rest of that first week, right through to Sunday 20 July, is a total dud. The swell height drops to zero or dash, and the combined energy is at 0 for several days. There’s no surf to speak of.
We get a little glimmer on Wednesday 22 July morning – a glassy, 0.7ft swell from the SSE, period a very short 3 seconds, with combined energy of just 1. That’s still a flat day. The wind is dead calm (glass) but the waves are barely there. This pattern of tiny, weak swells continues through to Saturday 25 July, with heights of 0.3ft to 1ft, and combined energy never climbing above 9. It’s a poor run.
The only standout, if you can call it that, comes on Sunday 26 July afternoon. A 2ft swell from the SSW, period 5 seconds, combined energy of 21 (still weak). The wind turns cross-onshore from the SSW at 12 mph, making it choppy. It’s not great, but it’s the biggest we get. Then Monday 27 July morning pushes up to 3ft from the SSW, period 6 seconds, energy 74 (weak to moderate), but cross-onshore winds at 15 mph spoil it. The afternoon sees 4ft, same direction, period 6 seconds, energy 69, with onshore wind from the SW at 6 mph. That’s the biggest swell of the whole period, but the wind is onshore and the quality is poor.
Tuesday 28 July and Wednesday 29 July keep the same kind of swell – 3ft to 4ft, short period, cross-onshore winds, and the energy stays in the 40–60 range. Not worth a paddle.
The best recommendation? Honestly, there isn’t one. The entire 16-day window is filled with poor surf conditions. If you’re a beginner and dead flat is your thing, maybe, but otherwise, leave the board at home. The setup looks more interesting for kite surfing than paddle surfing when the wind picks up.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Wed afternoon, min 18°C on Tue night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Very mild (max 19°C on Fri afternoon, min 13°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tue 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | |||||||||||||||
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) | SW 18 | SW 14 | SW 16 | SW 16 | S 16 | SW 14 | SW 14 | SSW 7 | SSW 6 | SW 12 | SW 12 | S 11 | SW 11 | S 11 | S 11 | S 10 | S 10 | N 4 | N 4 | N 5 | NNW 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 12 | 7 | 10 | 10 | 7 | 8 | 8 | 8 | 4 | 6 | 6 | 2 | 5 | 2 | 2 | 2 | 2 | 0 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | off | off | off | off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross | cross-off | cross-off | cross | cross-off | cross-off | cross-off |
High Tide | 11:18PM5.67m | 11:48AM5.52m | 00:06AM5.82m | 12:36PM5.53m | 00:52AM5.87m | 1:23PM5.44m | 1:37AM5.79m | 2:08PM5.28m | 2:22AM5.60m | 2:52PM5.06m | 3:07AM5.33m | 3:38PM4.82m | 3:53AM5.01m | ||||||||
Low Tide | 4:59PM0.91m | 5:31AM0.52m | 5:47PM0.80m | 6:20AM0.38m | 6:34PM0.77m | 7:08AM0.38m | 7:20PM0.84m | 7:55AM0.51m | 8:05PM1.00m | 8:41AM0.77m | 8:50PM1.23m | 9:27AM1.09m | 9:37PM1.52m | 10:16AM1.45m | |||||||
 |  | | | |  | |  |  | | | | | | | | | | | | | |
 | — | — | 5:07 | — | — | 5:09 | — | — | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — | 5:15 | — | — | 5:16 |
 | — | 9:39 | — | — | 9:38 | — | — | 9:37 | — | — | 9:36 | — | — | 9:35 | — | — | 9:34 | — | — | 9:32 | 9:30 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 21 | 22 | 22 | 23 | 23 | 22 | 23 | 21 | 18 | 19 | 19 | 14 | 17 | 17 | 16 | 17 | 15 | 14 | 15 | 16 | 18 |
Feels °C | 16 | 17 | 19 | 18 | 19 | 18 | 19 | 17 | 16 | 15 | 16 | 10 | 14 | 15 | 15 | 14 | 12 | 11 | 13 | 13 | 15 |
Swell 1 Height (m) Direction Period (s) | SW 18 | S 7 | S 6 | SW 6 | SSW 6 | N 4 | SW 6 | SSW 7 | SSW 6 | SW 6 | SW 6 | SW 6 | SW 6 | NNW 6 | NNW 5 | S 10 | S 10 | — | — | — | NW 5 |
| kJ | 12 | 1 | 1 | 2 | 4 | 1 | 1 | 5 | 4 | 2 | 1 | 1 | 1 | 52 | 7 | 2 | 2 | — | — | — | 7 |
Swell 2 Height (m) Direction Period (s) | — | SW 14 | SW 16 | SW 16 | SW 13 | SW 6 | SW 14 | SW 12 | S 12 | SW 12 | SW 12 | S 11 | SW 11 | S 11 | S 11 | — | — | — | — | — | — |
| kJ | — | 7 | 10 | 10 | 7 | 1 | 8 | 6 | 3 | 6 | 6 | 2 | 5 | 2 | 2 | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | S 13 | S 13 | S 16 | SW 14 | SW 7 | SW 14 | — | — | — | — | — | S 5 | — | — | — | — | — | — | — |
| kJ | — | — | 3 | 3 | 5 | 8 | 2 | 8 | — | — | — | — | — | 1 | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NE 4 | NE 4 | NE 4 | NE 4 | NNE 4 | — | NNE 3 | NNE 3 | NNW 4 | NNW 3 | N 4 | NNW 6 | N 6 | — | — | N 2 | N 3 | N 4 | N 4 | N 5 | NNW 5 |
| kJ | 11 | 11 | 6 | 11 | 9 | — | 4 | 3 | 3 | 4 | 9 | 83 | 77 | — | — | 1 | 1 | 10 | 9 | 32 | 35 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 163 | 267 | 312 | 364 | 306 | 314 | 210 | 267 | 326 | 781 | 273 | 267 | 284 | 277 | 284 | 284 | 273 | 284 | 382 | 273 | 283 |
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