Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 26 Aug 2026:
- Most powerful swell: Tuesday 1 Sep, 10AM (local time) - 6ft (1.9m), 7s period, SW swell with 312 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 1.9m 7s and forecast to arrive on Tuesday (Sep 01) at 10AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Friday (Aug 28) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Tue 1st Sep) | 6ft (1.9m) 7s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright, listen up. It's Rusty here.
Honestly, for the next 16 days, the surf scene around Trearddur Bay is looking pretty grim. We're staring down a long, flat spell with nothing but small, wind-chopped slop for the most part. You're gonna want to keep the board in the car for a while.
The first week is a write-off. We're talking about waves under 3 feet with weak energy all week. We've got moderate breezes and cross-off winds, but the swell just isn't there. Even with a bit of a bump on Saturday the 29th and into Sunday, it's all short-period, junky stuff, and the wind is going to be all over the place, mostly cross-onshore and lumpy. There's a real gap here where there's just nothing to get excited about. We finally see some proper size on the 1st of September, with a 6ft SW swell, but the wind is howling onshore and the energy is all over the place. It's a mess.
We get a bit of a break on the 2nd, but it's tiny again. Then the ocean gets angry on the 3rd and 4th. On the 4th, we're looking at a serious 10ft SW groundswell, but it's being battered by near-gale-force onshore winds. That's a washing machine, not a surf break. It's going to be a brutal paddle and probably pretty chaotic. This setup looks far more interesting for the kite surfers than for us paddle surfers.
After that, it fades again. The 6th has some cross-off wind and a 5ft WNW swell, but it's not consistent. Then it drops to nothing again. There's another stretch of flatness from the 7th to the 8th.
The only real glimmer of hope, and I mean the *only* standout in this entire window, is on the 10th of September, which is a Thursday. We've got a clean 8ft SW swell with a light, cross-off wind from the NNW. That will be the best on offer, no doubt. It's big enough to be fun but still manageable. It's still a week and a half out, so don't bank on it, but it's the one to keep an eye on.
Trearddur Bay (Holy Island) is a beginner spot that's inconsistent, and with most of these swells coming from the SSW and SW, they'll be close to, or squarely onshore for it. All things considered, it's going to be a long, frustrating fortnight. Hang tight.
Rusty.
Short Range ForecastHeavy rain (total 39mm), heaviest during Thu afternoon. Warm (max 22°C on Wed afternoon, min 16°C on Thu night). Winds increasing (light winds from the SSW on Wed morning, fresh winds from the NW by Fri morning). | Days 4-6 Weather SummaryHeavy rain (total 33mm), heaviest during Sun morning. Very mild (max 17°C on Sat morning, min 13°C on Sun night). Winds increasing (light winds from the SSW on Sat afternoon, strong winds from the WNW by Sun night). | ||||||||||||||||||||
Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | |||||||||||||||
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 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | SSW 7 | SSW 6 | SSW 6 | SW 7 | SSW 6 | SSW 6 | SW 9 | SSW 9 | SSW 6 | SSW 7 | WNW 5 | SW 5 | SW 6 | SW 7 | SW 7 | WNW 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 17 | 12 | 5 | 6 | 4 | 4 | 23 | 23 | 65 | 132 | 91 | 174 | 135 | 180 | 183 | 82 | 63 | 126 | 312 | 100 | 40 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross | on | on | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | on | on | cross-on |
High Tide | 10:26AM4.89m | 10:33PM5.32m | 10:57AM5.08m | 11:04PM5.51m | 11:27AM5.23m | 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 | |||||||
Low Tide | 4:21PM1.52m | 4:43AM1.19m | 4:52PM1.28m | 5:14AM0.96m | 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 | ||||||||
 |  |  |  |  |  | | | |  | | | |  |  | | |  | | |  | |
 | 6:16 | — | — | 6:18 | — | — | 6:20 | — | — | 6:20 | — | — | 6:22 | — | — | 6:24 | — | — | 6:26 | — | — |
 | — | 8:22 | — | — | 8:20 | — | — | 8:17 | — | — | 8:15 | — | — | 8:13 | — | — | 8:10 | — | — | 8:08 | — |
mm | — | — | — | 1 | 18 | 20 | — | — | — | 6 | 3 | — | 13 | 3 | 4 | — | 1 | 3 | 7 | 1 | — |
Temp °C | 20 | 22 | 19 | 19 | 17 | 16 | 17 | 19 | 19 | 17 | 17 | 15 | 16 | 17 | 16 | 15 | 17 | 16 | 16 | 17 | 16 |
Feels °C | 20 | 21 | 17 | 17 | 16 | 15 | 14 | 17 | 18 | 14 | 14 | 10 | 12 | 13 | 11 | 9 | 12 | 12 | 14 | 14 | 10 |
Swell 1 Height (m) Direction Period (s) | NE 5 | SSW 8 | SSW 7 | SSW 7 | NE 4 | N 5 | SSW 6 | NNW 5 | N 4 | N 5 | — | SW 9 | NW 4 | — | SSW 7 | SW 7 | NW 5 | — | — | WNW 4 | SW 5 |
| kJ | 4 | 12 | 5 | 5 | 3 | 11 | 23 | 17 | 1 | 2 | — | 174 | 4 | — | 183 | 77 | 10 | — | — | 13 | 12 |
Swell 2 Height (m) Direction Period (s) | SW 8 | NE 4 | SSW 4 | — | SSW 7 | SSW 7 | S 12 | SSW 6 | — | — | — | — | — | — | — | SW 11 | — | — | — | — | SW 6 |
| kJ | 17 | 3 | 2 | — | 4 | 4 | 3 | 23 | — | — | — | — | — | — | — | 5 | — | — | — | — | 11 |
Swell 3 Height (m) Direction Period (s) | SSE 4 | S 4 | S 12 | SW 12 | S 12 | S 12 | — | S 11 | S 11 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 2 | 1 | 3 | 6 | 3 | 3 | — | 3 | 2 | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | NE 2 | NE 5 | — | SSW 2 | NW 5 | W 4 | SW 7 | SSW 6 | SSW 6 | WNW 5 | SSW 9 | SSW 6 | — | WNW 5 | SW 5 | SW 6 | SW 7 | SW 7 | WNW 5 |
| kJ | — | — | 1 | 6 | — | 1 | 54 | 5 | 65 | 132 | 91 | 50 | 135 | 180 | — | 82 | 63 | 126 | 312 | 100 | 40 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 253 | 314 | 275 | 249 | 249 | 280 | 281 | 273 | 101 | 287 | 101 | 101 | 285 | 288 | 584 | 174 | 305 | 305 | 251 | 321 | 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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