Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 22 Aug 2026:
- Best quality surf: Friday 28 Aug, 4AM (local time) - 5.5ft (1.7m), 8s period, SSW swell with cross-offshore winds.
- Most powerful swell: Friday 28 Aug, 1AM (local time) - 7ft (2.1m), 8s period, SSW swell with 638 kJ wave energy.
- Next surfable swell (1★+): Friday 28 Aug, 4AM (local time) - 5.5ft (1.7m), 8s period with SSW swell.
Best Forecast Surf Conditions for Trearddur Bay (Holy Island) this week:
The surf forecast for Trearddur Bay (Holy Island) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 28) at 4AM. The primary swell is predicted to be 1.7m and 8s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Trearddur Bay (Holy Island) in the next 16 days are 2.1m 8s and forecast to arrive on Friday (Aug 28) at 1AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 5s period and expected on Tuesday (Aug 25) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Fri 28th Aug) | 5.5ft (1.7m) 8s |
| Best Surf | 4AM (Fri 28th Aug) | 5.5ft (1.7m) 8s |
| Most Powerful | 1AM (Fri 28th Aug) | 7ft (2.1m) 8s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Right then, mate, let’s have a look at what’s on offer for Trearddur Bay (Holy Island).
Honestly, it’s a pretty grim stretch ahead. There’s a big fat nothing for the first few days – from Saturday the 22nd right through to Monday the 25th, we’re talking flat. Swell is barely a whisper at 0.3 ft, so don’t even bother waxing up. The water’s a touch warmer than normal for this time of year at 63°, but that’s small comfort.
We get a little flicker of life on Wednesday the 26th morning with a 1 ft SW swell, but it’s short period at 8 seconds and the wind is cross-onshore, making for a choppy mess. Combined energy is weak (22). Not worth the drive.
Thursday the 27th sees a jump to 3 ft from the south early, with a fresh offshore breeze from the NE at 22 mph – that’ll clean it up, but the period is a short 7 seconds and the combined energy is still moderate at 64. By the afternoon it gets messy again with a strong cross-shore.
Friday the 28th morning is your best bet in this whole sorry outlook. We’ve got a 4 ft SSW swell, period up to 8 seconds, combined energy of 138 (moderate), and a light offshore NNE breeze at 6 mph. It’ll be clean, but the conditions are only described as ‘very ordinary’. Still, for a beginner spot that’s inconsistent, this is as good as it gets. Keep an eye on the crowds, they can turn up sometimes.
After that, it’s downhill. The rest of the period is a mess of onshore winds, lumpy seas, and poor surf quality. Swells get bigger – up to 5 ft on Friday the 4th of September – but the wind is howling onshore, making it unsurfable. That’s expert-only territory with those winds anyway. The combined energy hits 175 (moderate) on the 4th morning, but with a 25 mph onshore, it’s a write-off. This setup looks more interesting for kite surfing than paddle surfing.
In short, if you’re desperate, Friday the 28th morning is your only real window for a paddle. Otherwise, it’s a long, blank run. It tends not to stay this poor for long around here, so forecasts can change.
Rusty.
Short Range ForecastMostly dry. Warm (max 20°C on Mon afternoon, min 13°C on Sat morning). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 17mm), heaviest on Thu morning. Warm (max 20°C on Wed afternoon, min 15°C on Thu night). Winds increasing (light winds from the S on Wed afternoon, strong winds from the SSE by Thu afternoon). | ||||||||||||||||||||
Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | |||||||||||||||
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 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SW 13 | SW 13 | SSW 8 | SW 8 | SW 8 | SSW 7 | S 7 | SSW 7 | SSW 8 | SSW 8 | SSW 7 | SSW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 8 | 8 | 8 | 8 | 7 | 8 | 8 | 7 | 7 | 7 | 7 | 7 | 16 | 16 | 11 | 61 | 141 | 638 | 138 | 66 | 36 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | glassy | cross-off | cross-off | cross-off | off | cross-off | cross-on | cross-on | off | off | cross | cross-off | off | cross | cross |
High Tide | 7:07PM4.27m | 8:04AM4.17m | 8:27PM4.49m | 9:08AM4.41m | 9:19PM4.79m | 9:52AM4.67m | 9:59PM5.08m | 10:26AM4.89m | 10:33PM5.32m | 10:57AM5.08m | 11:04PM5.51m | 11:27AM5.23m | 11:36PM5.65m | ||||||||
Low Tide | 12:45PM2.45m | 1:37AM2.37m | 2:08PM2.34m | 2:47AM2.11m | 3:05PM2.09m | 3:35AM1.78m | 3:46PM1.80m | 4:11AM1.47m | 4:21PM1.52m | 4:43AM1.19m | 4:52PM1.28m | 5:14AM0.96m | 5:23PM1.07m | ||||||||
 |  |  | | | | | |  |  |  |  | | | |  |  |  | | | | |
 | 6:09 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:16 | — | — | 6:18 | — | — | 6:20 | — | — |
 | — | 8:31 | — | — | 8:29 | — | — | 8:27 | — | — | 8:24 | — | — | 8:22 | — | — | 8:20 | — | — | 8:17 | — |
mm | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — | — | 13 | 2 | — | — | — | 1 |
Temp °C | 13 | 14 | 14 | 15 | 16 | 17 | 18 | 20 | 19 | 18 | 19 | 19 | 18 | 20 | 17 | 17 | 17 | 16 | 18 | 17 | 16 |
Feels °C | 10 | 10 | 11 | 13 | 13 | 14 | 17 | 18 | 14 | 17 | 17 | 15 | 16 | 20 | 14 | 11 | 13 | 12 | 17 | 14 | 11 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 | SW 10 | S 4 | SW 13 | SW 13 | SW 9 | SSW 8 | SW 8 | SW 8 | SSW 7 | NE 4 | — | SW 8 | SSW 8 | SSW 7 | SSW 7 |
| kJ | 8 | 8 | 8 | 8 | 7 | 7 | 4 | 1 | 7 | 7 | 3 | 7 | 16 | 16 | 11 | 1 | — | 335 | 138 | 66 | 36 |
Swell 2 Height (m) Direction Period (s) | SW 15 | — | S 12 | SW 14 | — | SW 13 | SW 14 | SW 9 | SW 9 | SW 8 | SW 13 | S 13 | NE 5 | S 4 | NE 3 | S 12 | — | — | — | — | — |
| kJ | 8 | — | 3 | 8 | — | 7 | 8 | 3 | 3 | 3 | 7 | 3 | 3 | 1 | 1 | 3 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | W 12 | — | — | SW 14 | — | SW 13 | — | SW 8 | — | NE 5 | S 12 | NE 4 | S 12 | — | — | — | — | — | — |
| kJ | — | — | 3 | — | — | 8 | — | 7 | — | 3 | — | 1 | 3 | 1 | 3 | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNW 5 | NNW 4 | N 5 | NNW 4 | NNW 4 | — | — | NE 4 | E 3 | ENE 5 | NE 5 | ENE 5 | SSE 4 | — | S 4 | S 7 | SSW 7 | SSW 8 | — | — | WNW 4 |
| kJ | 25 | 16 | 22 | 6 | 3 | — | — | 1 | 4 | 18 | 22 | 19 | 3 | — | 6 | 61 | 141 | 638 | — | — | 28 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 187 | 284 | 187 | 163 | 184 | 155 | 246 | 249 | 249 | 276 | 249 | 307 | 273 | 286 | 161 | 187 | 298 | 8 | 0 | 88 | 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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