Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 31 Aug 2026:
- Most powerful swell: Wednesday 2 Sep, 4PM (local time) - 6ft (1.8m), 6s period, SSW swell with 241 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 1.8m 6s and forecast to arrive on Wednesday (Sep 02) 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 0.3m 5s period and expected on Monday (Aug 31) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Wed 2nd Sep) | 6ft (1.8m) 6s |
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 look at what Trearddur Bay (Holy Island) has got cooking for us. I’ll be straight with you – this is a quiet stretch ahead. The whole 16-day run is a bit of a write-off, to be honest.
The first recommendation for a surf doesn’t actually kick in until the 31st of August, and even then it’s a struggle. We’ve got a long gap of nothing worthwhile before that. The overall pattern is a lot of wind and not much in the way of rideable waves. The one spot we’ve got to look at is Trearddur Bay, but it’s not showing us any love.
Trearddur Bay is a beginner zone, inconsistent, and it’s only fairly exposed to the swell. The water’s sitting at 63°, which is a touch warmer than normal for this time of year.
Starting Monday the 31st of August, the morning is a write-off with a 4ft swell from the WNW, but the wind is howling at 22 mph from the same direction, making it a lumpy cross-shore mess. The energy is weak (154). The afternoon drops to 2ft from the SW, but it’s still choppy. Tuesday the 1st of September? Onshore wind at 16 mph, and a tiny 3ft swell. Poor.
Wednesday the 2nd sees a bump to 6ft from the SSW in the afternoon, and the energy picks up to a moderate 251 (still messy). Thursday the 3rd is onshore again. Friday the 4th is cross-onshore with a 5ft swell (151 energy), but it’s lumpy. The whole first week is just blown out or onshore. Saturday the 5th and Sunday the 6th are tiny and messy.
The best of it, if you can call it that, comes on Monday the 7th of September. The morning has a cross-offshore wind from the NNW at 16 mph, and the conditions are clean. The swell is only 3ft from the SSW, but the period is a short 5 seconds. The energy is very low (42). The afternoon is similar, clean, with a gentle breeze, but still only 3ft. It’s surfable for a beginner on a foamie, but it’s not a standout.
The second week looks even worse. Tuesday the 8th is cross-onshore and strong. Wednesday the 9th has a big 10ft swell from the SSW in the afternoon with a massive 866 energy, but the wind is a strong 25 mph onshore. That’s a washing machine, not a wave. This setup looks more interesting for kite surfing than paddle surfing. The rest of the week is tiny, and the following weekend is either blown out or near-gale force.
Honestly, I can’t recommend a single session here. Trearddur Bay is a beginner spot, and it’s inconsistent at the best of times. A blank run like this, with no consistent surf, is more normal for this area. It’s a tough one.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Tue night. Very mild (max 19°C on Wed night, min 14°C on Mon morning). Mainly strong winds. | Days 4-6 Weather SummaryModerate rain (total 10mm), heaviest on Thu night. Very mild (max 18°C on Thu afternoon, min 13°C on Fri night). Mainly fresh winds. | ||||||||||||||||||||
Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | |||||||||||||||
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) | WNW 5 | SW 8 | SSW 7 | SW 4 | SSW 5 | SW 5 | SSW 4 | SSW 6 | SW 6 | SW 6 | SSW 5 | SW 6 | WSW 6 | SW 5 | W 5 | NW 5 | SW 5 | SSW 4 | SSW 4 | SSW 4 | SSW 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 92 | 50 | 21 | 17 | 59 | 39 | 37 | 241 | 209 | 95 | 90 | 116 | 143 | 83 | 73 | 32 | 9 | 10 | 20 | 16 | 21 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | on | on | on | cross-on | cross-on | on | on | on | on | cross-on | on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross-on |
High Tide | 1:01PM5.41m | 1:15AM5.69m | 1:36PM5.36m | 1:53AM5.56m | 2:15PM5.23m | 2:36AM5.34m | 3:01PM5.01m | 3:30AM5.02m | 3:59PM4.75m | 4:41AM4.69m | 5:21PM4.55m | 6:18AM4.51m | 7:01PM4.59m | ||||||||
Low Tide | 7:04PM0.89m | 7:26AM0.78m | 7:42PM1.01m | 8:06AM0.98m | 8:25PM1.22m | 8:51AM1.28m | 9:16PM1.51m | 9:47AM1.66m | 10:23PM1.82m | 10:59AM2.01m | 11:50PM1.99m | 12:31PM2.14m | 1:25AM1.84m | ||||||||
 |  |  | |  |  |  | |  | | |  | | | |  | | | | | | |
 | 6:24 | — | — | 6:26 | — | — | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — | 6:33 | — | — | 6:35 | — | — |
 | — | 8:10 | — | — | 8:08 | — | — | 8:06 | — | — | 8:04 | — | — | 8:01 | — | — | 7:59 | — | — | 7:57 | — |
mm | — | — | — | — | 1 | 2 | 3 | — | — | — | 1 | 9 | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 17 | 17 | 15 | 17 | 16 | 16 | 17 | 19 | 17 | 18 | 15 | 15 | 17 | 15 | 14 | 14 | 15 | 17 | 18 | 17 |
Feels °C | 9 | 13 | 14 | 11 | 12 | 15 | 10 | 12 | 15 | 13 | 16 | 13 | 8 | 11 | 8 | 12 | 10 | 10 | 11 | 13 | 13 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SW 8 | SSW 7 | — | — | — | S 16 | SW 16 | SW 15 | SW 14 | — | NW 4 | SW 14 | WNW 5 | SW 14 | SW 5 | NW 4 | SW 13 | SW 13 | SW 13 | SW 12 |
| kJ | 62 | 50 | 21 | — | — | — | 5 | 10 | 9 | 8 | — | 4 | 8 | 15 | 8 | 14 | 4 | 7 | 7 | 6 | 6 |
Swell 2 Height (m) Direction Period (s) | — | N 5 | NNW 4 | — | — | S 16 | — | — | — | — | — | SW 14 | — | SW 14 | — | SW 14 | NNW 5 | — | — | — | SW 12 |
| kJ | — | 4 | 4 | — | — | 5 | — | — | — | — | — | 8 | — | 8 | — | 7 | 5 | — | — | — | 6 |
Swell 3 Height (m) Direction Period (s) | — | — | NW 4 | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 13 | — | — | — | — |
| kJ | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | 7 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WNW 5 | WNW 4 | W 3 | SW 4 | SSW 5 | SW 5 | SSW 4 | SSW 6 | SW 6 | SW 6 | SSW 5 | SW 6 | WSW 6 | SW 5 | W 5 | NW 5 | SW 5 | SSW 4 | SSW 4 | SSW 4 | SSW 4 |
| kJ | 92 | 22 | 3 | 17 | 59 | 39 | 37 | 241 | 209 | 95 | 90 | 116 | 143 | 83 | 73 | 32 | 9 | 10 | 20 | 16 | 21 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 548 | 51 | 51 | 290 | 323 | 246 | 252 | 288 | 289 | 283 | 293 | 51 | 319 | 548 | 179 | 182 | 246 | 189 | 189 | 288 | 285 |
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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