
Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 5 Aug 2026:
- Most powerful swell: Wednesday 5 Aug, 1PM (local time) - 5ft (1.5m), 5s period, W swell with 134 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 1.5m 5s and forecast to arrive on Wednesday (Aug 05) at 1PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 5s 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 | 1PM (Wed 5th Aug) | 5ft (1.5m) 5s |
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. It’s a pretty bleak outlook for the next couple of weeks. We’re looking at a long stretch of flat, gutless, and messy conditions with hardly anything worth paddling out for. The swell energy is just weak, mostly two-digit values in the brackets, and the wind is all over the place for the first week. We’re talking about a long, dry spell before we see even a hint of a wave worth your time.
Looking at the start, Wednesday the 5th is a write-off. We’ve got a cross-on breeze and waves around 5ft, but with a period of 5 seconds, it’s just wind chop. The energy is weak (100), and it’s a complete mess. That afternoon isn't any better, dropping to 3ft and the wind just messing it up more. Thursday and Friday are small and poor, with the swell basically disappearing. Friday afternoon is almost flat, with a 0.3ft wave on a long 12-second period, but there's no power behind it (6). Saturday, the 8th, brings a little more bump, but it's back to fresh cross-onshore winds and lumpy conditions. The whole first week is a complete bust. There's a bit of a glassy moment on Tuesday the 11th afternoon, but the swell is a pathetic 0.7ft, so it's not even worth mentioning as a surf. This is the kind of stretch where you're better off checking the tide pools.
The pattern stays poor well into the second week. We have some cleaner conditions around the 14th with a cross-offshore breeze, but the swell is tiny at 1ft. There’s just nothing to push you along. The next thing that even registers is a bit of a pulse on the 18th. We see the energy jump to a moderate 271, with a 6ft swell from the southwest. But the period is a short 6 seconds, and the wind is cross-on and choppy. It’s not going to be pretty. This will be a churning, lumpy mess.
Our only real chance comes on Wednesday the 19th of August. The wind finally swings to a cross-offshore, and it’s light, cleaning up the lineup. We’re looking at a 4ft swell, and while the period is still pretty ordinary at 5 seconds, the energy is moderate (105). Trearddur Bay (Holy Island) has its moments, and with the clean conditions, it might just be surfable. It’s an inconsistent spot, so you’ll be waiting for the sets, but it’s the only thing on the boards. The swell direction is from the northwest, which isn't dead optimal for the southwest direction the spot prefers, but beggars can't be choosers. This is the standout, but it’s not exactly a standout to write home about.
Beyond that, we're back to small and poor. There is a bit more energy late on the 18th, but the conditions will be rough. This is a case of a long, barren run. The surf just isn’t there, and it’s a proper test of patience. Don’t force it, keep the board in the car, and wait for the next proper swell. The forecasts can change, but as it stands, there's not much to get excited about. It's a waiting game.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Wed afternoon. Very mild (max 17°C on Tue night, min 13°C on Wed night). Winds decreasing (strong winds from the W on Wed morning, light winds from the W by Thu night). | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Sat night. Very mild (max 17°C on Sat afternoon, min 15°C on Fri night). Winds decreasing (fresh winds from the SSW on Sat afternoon, light winds from the W by Mon afternoon). | ||||||||||||||||||||
Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | |||||||||||||||
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) | W 5 | SW 6 | WNW 5 | NW 6 | WSW 4 | SW 4 | SW 4 | S 12 | SW 5 | SSW 4 | SSW 5 | SW 5 | SW 6 | SW 3 | SW 5 | SW 4 | SW 4 | SW 4 | SSW 5 | SSW 3 | SW 6 |
Wave Graph | |||||||||||||||||||||
100 | 61 | 87 | 76 | 9 | 9 | 6 | 3 | 26 | 31 | 77 | 43 | 18 | 7 | 23 | 18 | 18 | 5 | 5 | 1 | 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 | on | on | cross-on | cross-on | cross-on | on | cross-on | on | on | cross-on | cross-on | cross | on | glassy | cross-off |
High Tide | 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 | 10:01AM5.19m | 10:21PM5.51m | ||||||||
Low Tide | 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 | 4:01PM1.21m | ||||||||
5:39 | — | — | 5:41 | — | — | 5:43 | — | — | 5:45 | — | — | 5:47 | — | — | 5:48 | — | — | 5:50 | — | — | |
— | — | 9:07 | — | — | 9:05 | — | — | 9:02 | — | — | 9:00 | — | 8:59 | — | — | 8:57 | — | — | 8:54 | — | |
mm | — | 2 | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 16 | 15 | 14 | 15 | 16 | 15 | 16 | 15 | 16 | 17 | 17 | 15 | 16 | 17 | 15 | 17 | 17 | 16 | 18 | 20 |
Feels °C | 8 | 11 | 8 | 9 | 12 | 13 | 14 | 13 | 11 | 11 | 11 | 16 | 12 | 13 | 14 | 12 | 15 | 15 | 15 | 17 | 18 |
Swell 1 Height (m) Direction Period (s) | — | SW 6 | SSW 6 | SW 6 | N 5 | SW 4 | SW 4 | — | SW 12 | SW 11 | SW 11 | SW 8 | SW 6 | NW 4 | SW 5 | NW 4 | SW 4 | SW 4 | S 11 | SSW 3 | ENE 3 |
— | 61 | 26 | 18 | 13 | 9 | 5 | — | 5 | 5 | 5 | 2 | 18 | 3 | 23 | 6 | 18 | 5 | 2 | 1 | 1 | |
Swell 2 Height (m) Direction Period (s) | — | S 13 | SW 13 | S 13 | S 12 | N 4 | NW 3 | S 12 | — | — | — | S 11 | S 12 | SW 12 | — | — | — | — | — | SW 5 | — |
— | 3 | 7 | 3 | 3 | 2 | 3 | 3 | — | — | — | 2 | 3 | 6 | — | — | — | — | — | 1 | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | SW 12 | SW 12 | — | — | — | — | S 11 | — | — | — | — | — | — | — | — | SW 6 |
— | — | — | — | — | 6 | 6 | — | — | — | — | 2 | — | — | — | — | — | — | — | — | 1 | |
Wind waves Height (m) Direction Period (s) | W 5 | WNW 5 | WNW 5 | NW 6 | WSW 4 | — | — | SSW 3 | SW 5 | SSW 4 | SSW 5 | SW 5 | WNW 4 | SW 3 | WNW 3 | SW 4 | NW 4 | — | SSW 5 | — | — |
100 | 44 | 87 | 76 | 9 | — | — | 3 | 26 | 31 | 77 | 43 | 8 | 7 | 6 | 18 | 3 | — | 5 | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 462 | 514 | 586 | 283 | 273 | 273 | 280 | 251 | 246 | 246 | 251 | 195 | 251 | 235 | 358 | 358 | 292 | 246 | 246 | 246 | 249 |
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.











