Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 2 Aug 2026:
- Most powerful swell: Thursday 6 Aug, 4AM (local time) - 6ft (1.9m), 6s period, W swell with 258 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 1.9m 6s and forecast to arrive on Thursday (Aug 06) at 4AM. 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 3s period and expected on Monday (Aug 03) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4AM (Thu 6th Aug) | 6ft (1.9m) 6s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright, Rusty back again, but in feet and miles this time.
Honestly, there’s not a single decent wave to chase in the next 16 days. It’s a total blank spell. We’re looking at a massive gap from now, the 2nd of August, all the way through, with nothing worth mentioning. The swell is just too tiny and the wind is trash.
The only break on the cards is Trearddur Bay (Holy Island). It's a beginners spot that rarely breaks properly anyway. If you’re really squinting, the best shot might be on Sunday the 9th of August. There’s a 2ft swell from the WNW, and the morning goes glassy, so it’ll look clean. But the combined energy is still weak, I’m talking a reading of 15, so it’s dead flat. The water temp is nothing special for the time of year. Don’t expect much more than shin-high slop.
After that, it’s all downhill. By the 11th, it’s a total loss, and it stays flat and lumpy right through to the 17th. For a spot that’s this quiet normally, a run like this is just how it goes. Don’t get your hopes up, just wait for a better forecast.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Mon night. Warm (max 20°C on Mon morning, min 14°C on Sat night). Winds increasing (light winds from the SE on Sun morning, fresh winds from the SSW by Tue afternoon). | Days 4-6 Weather SummaryMostly dry. Very mild (max 18°C on Wed afternoon, min 13°C on Wed night). Winds decreasing (fresh winds from the W on Wed night, light winds from the NNW by Thu night). | ||||||||||||||||||||
Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | |||||||||||||||
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) | SSW 4 | SW 9 | W 10 | SSE 4 | SW 8 | SW 8 | S 4 | SSW 4 | SSW 5 | WSW 4 | SSW 5 | W 6 | WNW 6 | NW 5 | WNW 4 | SW 5 | SW 5 | SW 4 | NW 3 | SW 3 | SW 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3 | 3 | 3 | 3 | 11 | 10 | 15 | 34 | 90 | 45 | 102 | 209 | 154 | 38 | 11 | 6 | 3 | 5 | 5 | 3 | 9 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | off | cross-on | cross | cross-off | cross-on | cross-on | on | on | on | cross-on | cross-on | cross | off | cross-on | cross-on | cross-on | cross-on | cross-on | glassy |
High Tide | 1:32PM5.12m | 1:43AM5.48m | 2:07PM5.09m | 2:20AM5.40m | 2:46PM5.01m | 3:02AM5.25m | 3:31PM4.87m | 3:52AM5.04m | 4:26PM4.70m | 4:55AM4.80m | 5:37PM4.56m | 6:16AM4.64m | 7:05PM4.57m | ||||||||
Low Tide | 7:20AM0.89m | 7:31PM1.14m | 7:56AM0.93m | 8:09PM1.21m | 8:35AM1.03m | 8:51PM1.35m | 9:20AM1.21m | 9:40PM1.55m | 10:13AM1.46m | 10:41PM1.77m | 11:18AM1.72m | 11:58PM1.91m | 12:38PM1.85m | 1:25AM1.83m | |||||||
 | |  | |  |  |  | |  |  | | | | | | | | | | | | |
 | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — | 5:39 | — | — | 5:41 | — | — | 5:43 | — | — | 5:45 | — | — |
 | — | — | 9:12 | — | — | 9:10 | — | — | 9:08 | — | — | 9:07 | — | — | 9:05 | — | — | 9:02 | — | — | 9:00 |
mm | — | — | — | — | 1 | 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 16 | 17 | 20 | 18 | 17 | 19 | 18 | 17 | 16 | 18 | 16 | 14 | 16 | 15 | 14 | 15 | 15 | 15 | 16 | 15 |
Feels °C | 15 | 13 | 14 | 18 | 15 | 15 | 15 | 14 | 13 | 11 | 13 | 9 | 9 | 12 | 13 | 12 | 13 | 13 | 14 | 15 | 13 |
Swell 1 Height (m) Direction Period (s) | SSW 4 | SSW 3 | SW 8 | N 4 | SSW 4 | SW 8 | SW 8 | — | — | — | NW 4 | SW 13 | SW 6 | NW 5 | SSW 5 | SW 5 | NW 3 | SW 4 | NW 3 | — | SW 4 |
| kJ | 3 | 1 | 3 | 3 | 2 | 10 | 9 | — | — | — | 3 | 7 | 29 | 38 | 11 | 6 | 2 | 4 | 3 | — | 9 |
Swell 2 Height (m) Direction Period (s) | — | SW 9 | W 10 | ENE 5 | SW 8 | — | NE 4 | — | — | — | — | — | S 13 | S 12 | SW 12 | SW 12 | S 12 | SW 12 | SW 11 | S 11 | — |
| kJ | — | 3 | 2 | 2 | 11 | — | 1 | — | — | — | — | — | 3 | 3 | 6 | 6 | 3 | 5 | 5 | 2 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | SW 9 | NE 4 | — | — | — | — | — | — | — | — | — | — | SW 12 | — | — | SW 11 | — | — |
| kJ | — | — | — | 3 | 1 | — | — | — | — | — | — | — | — | — | — | 6 | — | — | 5 | — | — |
Wind waves Height (m) Direction Period (s) | — | — | NNE 3 | SSE 4 | NW 2 | — | S 4 | SSW 4 | SSW 5 | WSW 4 | SSW 5 | W 6 | WNW 6 | SW 6 | WNW 4 | NW 4 | SW 5 | — | SSW 4 | SW 3 | NW 2 |
| kJ | — | — | 10 | 2 | 1 | — | 15 | 34 | 90 | 45 | 102 | 209 | 154 | 20 | 8 | 4 | 3 | — | 1 | 3 | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 246 | 249 | 163 | 155 | 192 | 189 | 273 | 273 | 280 | 51 | 284 | 315 | 358 | 317 | 292 | 278 | 388 | 246 | 246 | 246 | 246 |
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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