Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 29 Jul 2026:
- Most powerful swell: Wednesday 29 Jul, 7PM (local time) - 3ft (0.9m), 5s period, SSW swell with 37 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 0.9m 5s and forecast to arrive on Wednesday (Jul 29) 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 0.6m 4s period and expected on Monday (Aug 03) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Wed 29th Jul) | 3ft (0.9m) 5s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s be honest with each other about what’s on offer around Trearddur Bay (Holy Island) for the next couple of weeks. I’ve looked at the numbers, and I’ve got to tell you, it’s a tough run.
Right now, and for the entire 16-day window, the surf just isn't showing up. We’re looking at a long, dry spell. From Wednesday, July 29th, all the way through to the end of the forecast on Thursday, August 13th, the combined swell energy barely gets a pulse going, sitting at weak levels (best seen at just 28). The biggest wave height we see is a measly 3 ft on Wednesday afternoon, but it’s riddled with a fresh cross-onshore wind from the SSW at 19 mph, making it lumpy and horrible. It’s a classic case of the wind and swell not lining up.
The water temperature is about average for the time of year, so no surprises there. The swell direction is trying to swing around from the SW, which is where Trearddur Bay is fairly exposed, but the period is consistently short – mostly 4 seconds or less – meaning no real energy or shape.
We do get a stretch from Sunday, August 2nd, through to Sunday, August 9th, where the wind goes offshore (NE) or clean cross-offshore, which is great for the surface. But the problem is the swell size is basically flat – 0.3 ft to 0.7 ft – with combined energy down in the single digits. It’s clean, but there’s nothing to ride. While the swell direction is roughly from the SW, which is the optimum for this spot, and the wind is perfect, the lack of any wave height means it’s a complete non-starter for a surfer.
The consistency is listed as “inconsistent” for this spot, and this forecast is a perfect example of that. It’s a blank run. For a beginner spot, even a small wave would be welcome, but there’s not enough to push a longboard. The only thing I can say is that conditions for the first week of August look beautiful for a swim, but for a surf? It’s a no-go. Don’t bother paddling out unless you’ve got a kite and a strong wind, because the wind is the only thing with any energy.
Rusty.
Short Range ForecastSome drizzle, heaviest during Wed afternoon. Very mild (max 18°C on Wed morning, min 14°C on Wed night). Winds decreasing (fresh winds from the S on Tue night, calm by Thu night). | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Sun night. Very mild (max 18°C on Sun morning, min 13°C on Fri night). Winds increasing (calm on Sat night, fresh winds from the ENE by Mon morning). | ||||||||||||||||||||
Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | |||||||||||||||
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 | SSW 4 | SW 5 | W 4 | NW 4 | SW 4 | SW 5 | SW 2 | SW 4 | WNW 4 | NW 3 | SW 4 | SSW 4 | SW 4 | SW 9 | SW 9 | SW 8 | SW 8 | SSW 7 | SSW 7 | SW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 22 | 28 | 17 | 14 | 5 | 4 | 3 | 1 | 12 | 7 | 3 | 4 | 1 | 1 | 3 | 3 | 3 | 10 | 5 | 5 | 2 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross | cross-on | on | glassy | cross-on | cross-on | cross-on | cross-on | cross-on | on | off | off | cross-off | off | off | cross-off | off | off | cross-off |
High Tide | 11:21AM4.96m | 11:31PM5.40m | 11:54AM5.05m | 00:03AM5.49m | 12:26PM5.10m | 00:36AM5.52m | 12:58PM5.13m | 1:09AM5.52m | 1:32PM5.12m | 1:43AM5.48m | 2:07PM5.09m | 2:20AM5.40m | 2:46PM5.01m | 3:02AM5.25m | |||||||
Low Tide | 5:08AM1.29m | 5:17PM1.36m | 5:41AM1.11m | 5:50PM1.23m | 6:14AM0.99m | 6:23PM1.15m | 6:46AM0.92m | 6:56PM1.12m | 7:20AM0.89m | 7:31PM1.14m | 7:56AM0.93m | 8:09PM1.21m | 8:35AM1.03m | 8:51PM1.35m | |||||||
 |  |  |  | |  | | | | | | |  | |  | | |  |  | | | |
 | 5:28 | — | — | 5:30 | — | — | 5:31 | — | — | 5:33 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — |
 | — | — | 9:19 | — | — | 9:17 | — | — | 9:15 | — | — | 9:14 | — | — | 9:12 | — | — | 9:10 | — | — | 9:08 |
mm | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 1 | 13 | 2 | — | — |
Temp °C | 18 | 18 | 16 | 14 | 16 | 16 | 15 | 15 | 15 | 13 | 15 | 15 | 18 | 18 | 16 | 15 | 15 | 14 | 14 | 15 | 14 |
Feels °C | 14 | 13 | 16 | 10 | 13 | 15 | 12 | 11 | 11 | 9 | 12 | 12 | 15 | 14 | 12 | 11 | 11 | 12 | 10 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | — | — | SW 5 | SW 5 | NW 4 | SW 4 | SW 5 | WNW 3 | SW 4 | SW 4 | NW 3 | SW 4 | SSW 4 | SW 4 | SW 9 | N 4 | SW 8 | SW 8 | SSW 7 | SSW 7 | SW 7 |
| kJ | — | — | 17 | 9 | 3 | 4 | 3 | 1 | 12 | 3 | 3 | 3 | 1 | 1 | 3 | 8 | 3 | 10 | 5 | 5 | 2 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | WSW 5 | SW 9 | W 8 | — | — | SW 9 | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 2 | 3 | 1 | — | — | 3 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | W 9 | — | W 8 | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | 2 | — | 1 | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 4 | SSW 4 | — | W 4 | SW 4 | — | WNW 3 | SW 2 | WNW 3 | WNW 4 | SW 4 | SW 3 | N 3 | N 3 | NNE 3 | — | N 3 | N 3 | N 4 | N 5 | N 4 |
| kJ | 22 | 28 | — | 14 | 5 | — | 2 | 1 | 1 | 7 | 1 | 4 | 3 | 3 | 6 | — | 6 | 6 | 13 | 11 | 9 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 246 | 246 | 246 | 548 | 586 | 249 | 288 | 587 | 307 | 358 | 368 | 251 | 251 | 298 | 161 | 163 | 163 | 286 | 462 | 580 | 280 |
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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