Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 28 Aug 2026:
- Best quality surf: Saturday 29 Aug, 10PM (local time) - 2.5ft (0.8m), 8s period, SSW swell with glassy winds.
- Most powerful swell: Wednesday 2 Sep, 7PM (local time) - 7.5ft (2.3m), 7s period, SW swell with 481 kJ wave energy.
- Next surfable swell (1★+): Saturday 29 Aug, 10PM (local time) - 2.5ft (0.8m), 8s period with SSW swell.
Best Forecast Surf Conditions for Trearddur Bay (Holy Island) this week:
The surf forecast for Trearddur Bay (Holy Island) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Aug 29) at 10PM. The primary swell is predicted to be 0.8m and 8s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Trearddur Bay (Holy Island) in the next 16 days are 2.3m 7s and forecast to arrive on Wednesday (Sep 02) at 7PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 5s period and expected on Monday (Aug 31) at 4PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 10PM (Sat 29th Aug) | 2.5ft (0.8m) 8s |
| Best Surf | 10PM (Sat 29th Aug) | 2.5ft (0.8m) 8s |
| Most Powerful | 7PM (Wed 2nd Sep) | 7.5ft (2.3m) 7s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright, crew, Rusty here. Let's size up Trearddur Bay over the next couple weeks. Gotta be honest, the outlook's a tough one. We're looking at a long stretch of days where the surf just isn't happening. The wind is mostly onshore or cross-onshore, often blowing a gale, and the conditions are just plain messy. The water is a touch warmer than usual for the season, holding at about 63°, but that's small comfort when there's nothing to ride.
The first real standout, if you can call it that, doesn't show up until Monday, September the 8th. A big groundswell from the SW rolls in, a solid 13ft, with a 9-second period. The combined energy is huge at (2418), but the west wind is howling at 25 mph, making it a messy, strong cross-onshore disaster. That size is for experts only, and with that wind, I'd be more tempted to rig up a kite than paddle out.
The afternoon of that same day, the 8th, might be the pick of a bad bunch. The swell drops to 7ft from the SW, with a long 10-second period, so it's a proper groundswell with real energy (1011). The wind clocks northwest to 25 mph, going cross-shore, but it's still a strong breeze with messy cross-chop. The direction is what Trearddur Bay likes best, but the wind is just ruining it. For a spot that's inconsistent, this is a long, lean run.
Honestly, beginners, leave the board at home. The surf is either too small, too windy, or too big and blown out. This kind of blank stretch is more normal for this area. Conditions can turn, but as it stands, it's a waiting game.
Rusty.
Short Range ForecastModerate rain (total 12mm), heaviest on Sat morning. Very mild (max 17°C on Fri afternoon, min 14°C on Sun night). Winds increasing (calm on Sat night, fresh winds from the WNW by Mon morning). | Days 5-7 Weather SummaryModerate rain (total 19mm), heaviest on Tue night. Very mild (max 18°C on Wed afternoon, min 14°C on Tue night). Mainly strong winds. | |||||||||||||||||||
Fri 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | ||||||||||||||
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) | SW 6 | SSW 6 | SSW 6 | SSW 6 | SSW 9 | SSW 9 | SSW 5 | SW 8 | NW 5 | SSW 8 | SSW 7 | WSW 6 | SW 6 | SW 6 | SW 6 | SSW 6 | SW 7 | WSW 5 | SW 5 | SW 6 |
Wave Graph  | ||||||||||||||||||||
 kJ | 20 | 46 | 60 | 25 | 157 | 49 | 46 | 122 | 110 | 39 | 35 | 52 | 37 | 46 | 33 | 322 | 287 | 111 | 68 | 97 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross-off | on | cross-on | cross-on | cross-on | cross | cross-on | on | on | on | cross-on | cross-on | on | cross-on | on | cross-on | cross-on |
High Tide | 11:36PM5.65m | 11:57AM5.33m | 00:07AM5.72m | 12:28PM5.40m | 00:40AM5.74m | 1:01PM5.41m | 1:15AM5.69m | 1:36PM5.36m | 1:53AM5.56m | 2:15PM5.23m | 2:36AM5.34m | 3:01PM5.01m | 3:30AM5.02m | |||||||
Low Tide | 5:23PM1.07m | 5:44AM0.80m | 5:55PM0.94m | 6:16AM0.70m | 6:28PM0.87m | 6:50AM0.69m | 7:04PM0.89m | 7:26AM0.78m | 7:42PM1.01m | 8:06AM0.98m | 8:25PM1.22m | 8:51AM1.28m | 9:16PM1.51m | |||||||
 |  |  |  | |  |  |  |  | | | | |  | | | | | | | |
 | — | — | 6:20 | — | — | 6:22 | — | — | 6:24 | — | — | 6:26 | — | — | 6:28 | — | — | 6:30 | — | — |
 | 8:17 | — | — | 8:15 | — | — | 8:13 | — | — | 8:10 | — | — | 8:08 | — | — | 8:06 | — | — | 8:04 | — |
mm | — | — | 6 | — | — | 2 | 1 | 3 | — | — | — | — | 1 | 7 | 7 | 3 | — | 1 | 1 | — |
Temp °C | 17 | 17 | 16 | 16 | 16 | 17 | 16 | 16 | 15 | 16 | 17 | 16 | 17 | 17 | 17 | 18 | 17 | 16 | 17 | 15 |
Feels °C | 15 | 15 | 15 | 14 | 16 | 13 | 11 | 13 | 9 | 12 | 15 | 11 | 14 | 17 | 11 | 15 | 11 | 9 | 11 | 9 |
Swell 1 Height (m) Direction Period (s) | N 3 | — | SSW 6 | SSW 6 | SSW 9 | SSW 9 | SW 8 | SW 7 | SW 8 | SSW 8 | SSW 7 | — | NW 4 | SW 6 | NNW 4 | — | SW 15 | SW 14 | SW 14 | SW 14 |
| kJ | 1 | — | 60 | 25 | 157 | 49 | 16 | 122 | 60 | 39 | 35 | — | 4 | 46 | 1 | — | 9 | 8 | 8 | 8 |
Swell 2 Height (m) Direction Period (s) | S 11 | S 11 | N 4 | — | NNW 3 | WNW 3 | — | — | — | N 5 | NNW 5 | — | — | — | S 16 | — | — | — | — | — |
| kJ | 3 | 2 | 2 | — | 1 | 1 | — | — | — | 12 | 4 | — | — | — | 5 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | NNW 5 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 4 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 6 | SSW 6 | — | N 4 | — | SSW 3 | SSW 5 | SW 8 | NW 5 | WNW 4 | WNW 3 | WSW 6 | SW 6 | — | SW 6 | SSW 6 | SW 7 | WSW 5 | SW 5 | SW 6 |
| kJ | 20 | 46 | — | 1 | — | 4 | 46 | 111 | 110 | 16 | 1 | 52 | 37 | — | 33 | 322 | 287 | 111 | 68 | 97 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 283 | 280 | 280 | 179 | 51 | 255 | 255 | 114 | 174 | 51 | 179 | 319 | 388 | 246 | 249 | 585 | 280 | 1080 | 548 | 280 |
Best forecast wave conditions in Anglesy | ||||||||||||||||||||
Best forecast wave conditions in United Kingdom | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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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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