Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 4 Aug 2026:
- Most powerful swell: Wednesday 5 Aug, 10AM (local time) - 5ft (1.6m), 5s period, W swell with 147 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 1.6m 5s and forecast to arrive on Wednesday (Aug 05) at 10AM. 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 5s period and expected on Monday (Aug 10) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Wed 5th Aug) | 5ft (1.6m) 5s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a proper look at what’s on offer for Trearddur Bay over the next couple of weeks. I’ll be straight with you – it’s a tough outlook.
We’re kicking off with a pretty grim run here. From Tuesday, the 4th of August, right through the entire 16-day forecast window, it’s all poor surf conditions. There’s simply no good quality surf on the cards. It’s a long, blank run, and that’s just how it is right now.
The first few days are a write-off. Tuesday the 4th brings a messy 4ft SSW swell, but with a short, weak period of 5 seconds and a fresh cross-onshore wind at 19 mph, it’s lumpy and ugly. The combined wave energy is weak (64 to 74). Wednesday the 5th gets a bit bigger, with a 5ft W swell, but the wind cranks up to 25 mph, making it a total mess. That’s too big for beginners anyway, but the quality is just not there for anyone.
The wind does ease at times later in the week, like on Thursday the 6th afternoon when it goes glassy, but the swell drops to a pathetic 2ft. Friday the 7th sees a tiny 0.3ft swell with a long 12-second period, but it’s pointless. We get a few clean-looking windows on Monday the 10th and into the second week with cross-offshore winds, but the swell is consistently tiny – never more than 2ft. The combined energy barely registers, often in single digits. It’s just not enough to push a wave.
There is a blip on Thursday the 13th morning with a 3ft SW swell and light onshore wind, but the energy is still low (49) and the quality is unknown. It’s not anything to get excited about.
So, the honest truth? There are no standouts. No good options. This is a lean period for Trearddur Bay. The water temperature is sitting at 62°F, which is about 2°F warmer than usual for this time of year, but that’s small comfort when there’s no surf. For a beginner-friendly spot that’s inconsistent anyway, a blank run like this isn’t totally abnormal. Forecasts can change, so don’t lose all hope, but for now, I’d hang the board up for a bit.
Rusty.
Short Range ForecastMostly dry. Very mild (max 18°C on Tue morning, min 13°C on Wed night). Winds decreasing (fresh winds from the W on Wed morning, light winds from the SW by Thu afternoon). | Days 4-6 Weather SummarySome drizzle, heaviest during Sun morning. Very mild (max 18°C on Sun afternoon, min 12°C on Sun night). Winds decreasing (fresh winds from the SSW on Sat morning, light winds from the W by Sun morning). | ||||||||||||||||||||
Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | |||||||||||||||
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 5 | SSW 5 | SSW 6 | W 5 | WSW 5 | NW 6 | NW 5 | WSW 4 | SSW 5 | SW 5 | S 12 | SW 5 | SSW 4 | SSW 5 | SW 5 | SSW 4 | SW 6 | WNW 4 | SSW 5 | WNW 4 | SW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 64 | 74 | 55 | 147 | 78 | 110 | 80 | 9 | 9 | 6 | 3 | 31 | 34 | 64 | 42 | 8 | 11 | 18 | 3 | 4 | 1 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | on | on | on | cross-on | on | on | cross-on | cross-on | cross-on | cross-on | cross-off | cross-off | cross-off | off |
High Tide | 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 | 7:47AM4.68m | 8:27PM4.80m | 9:03AM4.91m | 9:30PM5.16m | ||||||||
Low Tide | 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 | 1:59PM1.77m | 2:41AM1.51m | 3:06PM1.52m | 3:41AM1.10m | ||||||||
 | |  | | |  | | | |  | | | | | |  | | | | | | |
 | 5:37 | — | — | 5:39 | — | — | 5:41 | — | — | 5:43 | — | — | 5:45 | — | — | 5:47 | — | — | 5:48 | — | — |
 | — | — | 9:08 | — | — | 9:07 | — | — | 9:05 | — | — | 9:02 | — | — | 9:00 | — | 8:59 | — | — | 8:57 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — |
Temp °C | 18 | 18 | 17 | 15 | 16 | 15 | 14 | 15 | 16 | 14 | 16 | 16 | 15 | 16 | 16 | 16 | 18 | 17 | 13 | 14 | 16 |
Feels °C | 14 | 14 | 14 | 8 | 9 | 8 | 9 | 12 | 13 | 11 | 12 | 12 | 11 | 11 | 12 | 15 | 17 | 16 | 8 | 10 | 14 |
Swell 1 Height (m) Direction Period (s) | NE 4 | — | SSW 6 | — | S 13 | SW 6 | SW 6 | NNW 5 | SSW 5 | NW 3 | WNW 3 | SW 5 | SW 11 | — | S 11 | SSW 4 | SW 6 | SSW 6 | SSW 5 | NNW 5 | NNW 4 |
| kJ | 1 | — | 55 | — | 3 | 30 | 13 | 20 | 9 | 3 | 1 | 17 | 5 | — | 2 | 8 | 11 | 4 | 3 | 20 | 3 |
Swell 2 Height (m) Direction Period (s) | — | — | SW 7 | — | — | SW 13 | S 13 | S 12 | N 4 | SW 12 | S 12 | SW 12 | — | S 13 | — | SW 7 | S 12 | S 12 | — | SW 6 | SW 6 |
| kJ | — | — | 12 | — | — | 7 | 3 | 3 | 1 | 6 | 3 | 5 | — | 3 | — | 2 | 3 | 3 | — | 1 | 1 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | SW 12 | SW 12 | SW 12 | — | — | — | — | — | — | SW 12 | — | — | — | — |
| kJ | — | — | — | — | — | — | — | 6 | 6 | 6 | — | — | — | — | — | — | 6 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 5 | SSW 5 | WNW 3 | W 5 | WSW 5 | NW 6 | NW 5 | WSW 4 | — | SW 5 | SSW 3 | SW 5 | SSW 4 | SSW 5 | SW 5 | NW 3 | NW 3 | WNW 4 | NW 5 | WNW 4 | — |
| kJ | 64 | 74 | 4 | 147 | 78 | 110 | 80 | 9 | — | 5 | 3 | 31 | 34 | 64 | 42 | 2 | 3 | 18 | 45 | 4 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 280 | 280 | 88 | 501 | 476 | 514 | 283 | 273 | 283 | 273 | 251 | 251 | 251 | 285 | 251 | 192 | 1277 | 192 | 235 | 285 | 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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