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, WNW swell with 246 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-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 6s period and expected on Thursday (Aug 06) at 1PM.
| 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 here. Let’s talk about Trearddur Bay (Holy Island) in feet and miles per hour.
First off, don’t get your hopes up too early. For the first week and a half, it’s a total desert. From now until about the 14th of August, the surf is flat-out poor. Tiny waves, onshore and cross-shore winds, choppy mess. The water temp is about 61°F, which is pretty normal for the season, so no complaints there.
The first real chance to paddle out comes on the morning of the 14th of August. Trearddur Bay will have a clean 4ft swell from the NW, a short period of 5 seconds, and a light cross-offshore breeze from the north at 12 mph. The energy is moderate at 81. It’s surfable, but don’t expect much power.
The real highlight rolls in on the 15th of August. Saturday morning brings a clean 3ft swell from the WNW, with a light cross-offshore breeze from the ENE at 3 mph, energy at 68. But the afternoon is the one to circle. The wind swings offshore from the NE at 12 mph, the swell pushes up to 4ft from the NW, and the energy climbs to 82. That’s the cleanest, most fun setup of the whole forecast. Keep in mind, this spot is inconsistent, so the sets will be spaced out, but when they come, they’ll be worth it. Crowds are a possibility.
After that, the 16th and 17th fall back into tiny, messy surf. The 12th of August had a glassy moment, but no waves.
Best bet: the afternoon of the 15th of August. That offshore wind and NW swell is your only real standout.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Mon night. Warm (max 21°C on Mon morning, min 15°C on Tue night). Winds increasing (calm on Mon afternoon, fresh winds from the SSW by Tue night). | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Wed morning. Very mild (max 17°C on Thu night, min 13°C on Wed night). Winds decreasing (fresh winds from the WNW on Wed night, light winds from the NW 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 | SW 9 | SW 8 | SW 8 | SSW 5 | SSW 5 | SSW 6 | SSW 7 | SW 7 | W 5 | NW 6 | SW 5 | SW 5 | SW 5 | SW 4 | SW 5 | SW 5 | WSW 5 | SW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3 | 3 | 3 | 3 | 11 | 10 | 42 | 72 | 127 | 90 | 79 | 121 | 133 | 14 | 7 | 7 | 14 | 26 | 69 | 35 | 16 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | cross-on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | on | on | on | on | on | cross | cross-on | on |
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 | 7:31PM1.14m | 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 | — | — | — | — | — | 4 | — | — | — | 2 | 1 | — | — | — | — | — | — | 3 | — | — | — |
Temp °C | 17 | 17 | 17 | 21 | 20 | 19 | 18 | 18 | 17 | 15 | 16 | 15 | 13 | 15 | 17 | 16 | 17 | 15 | 14 | 15 | 15 |
Feels °C | 16 | 15 | 12 | 19 | 17 | 17 | 15 | 13 | 12 | 10 | 10 | 9 | 8 | 11 | 15 | 15 | 12 | 14 | 12 | 12 | 13 |
Swell 1 Height (m) Direction Period (s) | SSW 4 | — | SW 8 | ENE 5 | SW 8 | SW 8 | SW 8 | — | — | SSW 7 | SW 7 | S 13 | SW 6 | NNW 6 | NNW 5 | NNW 4 | S 12 | SW 12 | SW 11 | S 11 | SW 6 |
| kJ | 3 | — | 3 | 2 | 11 | 10 | 2 | — | — | 90 | 79 | 3 | 29 | 33 | 4 | 1 | 3 | 5 | 5 | 2 | 16 |
Swell 2 Height (m) Direction Period (s) | — | SW 9 | — | N 4 | S 3 | NNE 4 | NE 4 | — | — | — | — | — | S 13 | W 4 | — | SW 12 | — | SW 12 | — | — | — |
| kJ | — | 3 | — | 1 | 1 | 1 | 1 | — | — | — | — | — | 3 | 10 | — | 6 | — | 5 | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | W 10 | SW 9 | NE 5 | — | — | — | — | — | — | — | — | S 12 | SW 12 | — | — | — | — | — | — |
| kJ | — | — | 2 | 3 | 1 | — | — | — | — | — | — | — | — | 3 | 6 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | NE 3 | SSE 3 | — | SSW 2 | SSW 5 | SSW 5 | SSW 6 | WNW 4 | WNW 4 | W 5 | NW 6 | SW 5 | SW 5 | SW 5 | SW 4 | SW 5 | SW 5 | WSW 5 | NW 3 |
| kJ | — | — | 5 | 2 | — | 1 | 42 | 72 | 127 | 17 | 9 | 121 | 133 | 14 | 7 | 7 | 14 | 26 | 69 | 35 | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 246 | 246 | 163 | 186 | 192 | 280 | 273 | 273 | 128 | 278 | 317 | 187 | 285 | 273 | 273 | 273 | 273 | 246 | 51 | 179 | 179 |
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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