Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 9 Sep 2026:
- Most powerful swell: Thursday 10 Sep, 4PM (local time) - 7ft (2.2m), 7s period, SSW swell with 424 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 2.2m 7s and forecast to arrive on Thursday (Sep 10) at 4PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 6s period and expected on Wednesday (Sep 09) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Thu 10th Sep) | 7ft (2.2m) 7s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s be straight with you – this forecast for Trearddur Bay is a tough one to write. We’re looking at a long, bleak stretch with nothing really surfable on the cards for the better part of the next two weeks. The good news? It’s so poor that it can’t stay this way forever, and forecasts can change.
Right now, we’re in a dry spell. The first few days are a write-off. Wednesday the 9th has tiny 1ft windswell from the SW with a short 8-second period, and a cross-shore breeze making it choppy. The combined energy is a measly 20 – that’s weak. The water is sitting at 62°, which is a touch warmer than normal for this time of year, but that’s about the only highlight.
Thursday the 10th actually sees a bump in height, with 5ft in the morning jumping to 7ft by the afternoon, and the combined energy getting up to 424 (moderate wave energy). But it’s a complete mess. That SW swell is short period (5-7 seconds) and the wind is a strong 25 mph cross-onshore. It’s not for surfing; that setup is more interesting for kite surfing than paddle surfing.
The pattern continues with little improvement. Friday the 11th drops back to tiny surf, and Saturday the 12th has a 7ft swell in the morning (energy 403) but it’s onshore and messy again. Even when the wind goes glassy on Sunday the 13th afternoon, the swell is only 1ft. There’s just no push.
From Monday the 14th right through to the end of the forecast on the 24th of September, we’re looking at a gap of almost 11 days with no real surf recommendations. The swell is either flat, tiny, or blown out. There are a few moments where the wind goes clean, like Wednesday the 16th morning with a light cross-off breeze, but the swell is only 1ft. It’s heartbreaking.
So, the honest truth? There is no standout. There is no best on offer. The entire 16-day window is a bust for Trearddur Bay. The break is inconsistent at the best of times, and this is one of those blank runs that’s more normal for the area. Stay patient, keep an eye on the charts, and maybe give the board a rest.
Rusty.
Short Range ForecastModerate rain (total 13mm), heaviest on Fri night. Very mild (max 17°C on Thu night, min 13°C on Wed morning). Winds increasing (light winds from the NW on Wed afternoon, strong winds from the SSW by Thu morning). | Days 4-6 Weather SummaryLight rain (total 6mm), mostly falling on Sat morning. Very mild (max 18°C on Sat afternoon, min 15°C on Sat night). Winds increasing (calm on Sun afternoon, strong winds from the SSW by Mon night). | ||||||||||||||||||||
Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | |||||||||||||||
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) | SW 8 | SW 8 | SW 4 | SSW 5 | SSW 7 | SSW 7 | SW 7 | SW 7 | SSW 4 | SW 7 | SW 7 | SSW 6 | SSW 6 | SSW 6 | SW 6 | SSW 3 | SSW 5 | SSW 6 | SW 6 | SW 6 | SW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 15 | 14 | 23 | 149 | 424 | 127 | 36 | 21 | 50 | 403 | 220 | 71 | 26 | 16 | 9 | 7 | 80 | 184 | 223 | 99 | 15 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | on | on | on | cross | glassy | cross-on | cross-on | cross-on | cross-on | on | on | cross-off |
High Tide | 10:08PM5.63m | 10:36AM5.47m | 10:49PM5.85m | 11:14AM5.59m | 11:28PM5.95m | 11:50AM5.61m | 00:04AM5.91m | 12:25PM5.56m | 00:40AM5.77m | 1:00PM5.44m | 1:15AM5.55m | 1:34PM5.27m | 1:50AM5.26m | ||||||||
Low Tide | 3:50PM1.24m | 4:19AM0.68m | 4:32PM0.95m | 5:00AM0.47m | 5:11PM0.75m | 5:39AM0.42m | 5:49PM0.68m | 6:16AM0.50m | 6:26PM0.74m | 6:52AM0.70m | 7:02PM0.91m | 7:27AM0.99m | 7:38PM1.17m | ||||||||
 | |  |  | |  |  | | | | |  |  | |  | | | | | | | |
 | 6:39 | — | — | 6:41 | — | — | 6:43 | — | — | 6:45 | — | — | 6:47 | — | — | 6:48 | — | — | 6:50 | — | — |
 | — | 7:50 | — | — | 7:46 | — | — | 7:45 | — | — | 7:42 | — | — | 7:39 | — | — | 7:37 | — | — | 7:35 | — |
mm | — | — | — | 1 | 2 | 1 | — | — | 9 | 1 | 1 | 2 | — | — | — | — | — | 2 | — | — | — |
Temp °C | 13 | 14 | 15 | 16 | 16 | 17 | 13 | 14 | 15 | 17 | 18 | 17 | 15 | 15 | 16 | 17 | 17 | 17 | 16 | 17 | 17 |
Feels °C | 8 | 12 | 9 | 9 | 12 | 14 | 9 | 11 | 7 | 13 | 16 | 16 | 14 | 15 | 15 | 14 | 13 | 12 | 13 | 15 | 13 |
Swell 1 Height (m) Direction Period (s) | SW 8 | N 5 | N 4 | — | — | SSW 7 | SW 7 | SW 7 | — | — | — | SSW 6 | SSW 6 | SSW 6 | SW 6 | — | SW 12 | — | — | — | SW 6 |
| kJ | 15 | 27 | 1 | — | — | 127 | 36 | 21 | — | — | — | 71 | 26 | 16 | 9 | — | 6 | — | — | — | 15 |
Swell 2 Height (m) Direction Period (s) | SW 6 | SW 8 | — | — | — | — | — | NNW 4 | — | — | — | — | — | — | N 4 | — | — | — | — | — | S 11 |
| kJ | 5 | 14 | — | — | — | — | — | 3 | — | — | — | — | — | — | 1 | — | — | — | — | — | 2 |
Swell 3 Height (m) Direction Period (s) | — | NW 4 | — | — | — | — | — | NW 4 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 1 | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 6 | W 4 | SW 4 | SSW 5 | SSW 7 | W 4 | NW 4 | W 3 | SSW 4 | SW 7 | SW 7 | NNE 3 | NNW 3 | NNW 4 | — | SSW 3 | SSW 5 | SSW 6 | SW 6 | SW 6 | NNW 2 |
| kJ | 127 | 4 | 23 | 149 | 424 | 6 | 22 | 2 | 50 | 403 | 220 | 2 | 4 | 4 | — | 7 | 80 | 184 | 223 | 99 | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 179 | 51 | 179 | 292 | 312 | 51 | 179 | 51 | 299 | 319 | 88 | 235 | 219 | 235 | 192 | 186 | 250 | 279 | 195 | 187 | 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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