Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 22 Aug 2026:
- Best quality surf: Thursday 27 Aug, 7PM (local time) - 7ft (2.1m), 6s period, WSW swell with offshore winds.
- Most powerful swell: Thursday 27 Aug, 7PM (local time) - 7ft (2.1m), 6s period, WSW swell with 333 kJ wave energy.
- Next surfable swell (1★+): Thursday 27 Aug, 4PM (local time) - 5.5ft (1.7m), 5s period with WSW 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 Thursday (Aug 27) at 4PM. The primary swell is predicted to be 1.7m and 5s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Trearddur Bay (Holy Island) in the next 16 days are 2.1m 6s and forecast to arrive on Thursday (Aug 27) at 7PM. Winds are predicted to be 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 Saturday (Aug 22) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4PM (Thu 27th Aug) | 5.5ft (1.7m) 5s |
| Best Surf | 7PM (Thu 27th Aug) | 7ft (2.1m) 6s |
| Most Powerful | 7PM (Thu 27th Aug) | 7ft (2.1m) 6s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Right. Rusty here. Let’s have a look at what’s on offer for Trearddur Bay on Holy Island, and I’ll be straight with you – it’s a lean run. The whole 16-day stretch is a tough one. We’ve got a long gap of several days right from the start where there’s simply nothing worth paddling out for.
The first chance for a wave that’s even worth a sniff comes on Thursday afternoon, the 27th of August. Trearddur Bay will see a bump up to about 6 ft from the WSW, but that’s coming with a short, weak period of just 5 seconds and the energy is moderate at best (156). The wind goes glassy for a moment, which is a major positive, so it’ll look clean as a whistle. Honestly, this is a rare, fleeting moment of surfable, glassy conditions, but the swell is weak and disorganised – not a standout, just a brief window if you’re desperate.
We then drop right back into tiny, poor surf for days. Friday the 28th and Saturday the 29th are a write-off.
The best on offer – and I mean the only real standout in this whole outlook – is Thursday the 3rd of September. Trearddur Bay will see a solid 7 ft swell out of the SSW, with a long-period energy that finally shows some teeth. The combined energy is very strong (1277). The period is 10 seconds, which is decent, giving the waves some push. Now, here’s the catch: it’s a beach setup, and a swell that size with that much energy will be breaking heavy and straight on an onshore wind (SE at 19 mph, fresh cross-shore). This is expert territory only at 7 ft; beginners should stay well away. The wind will make it lumpy and choppy, so while it’s the biggest swell of the period, the quality is poor. This setup is actually more interesting for the kite surfers than paddle surfers.
After that, we fizzle out again. Friday the 4th of September offers a little 3 ft swell from the SSW with a moderate offshore wind (NNE, 12 mph), which will be clean, but the energy is weak (144) and the surf is ordinary at best – not a call to action.
So, to wrap it up. Water temp? Nothing unusual to report, it’s about average. The whole outlook is barren. If you’re local, you know this area can go quiet; a blank run like this is more normal than a surprise. Don’t hold your breath – forecasts change, but right now, the surf is not your friend.
Rusty.
Short Range ForecastMostly dry. Warm (max 20°C on Mon afternoon, min 13°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 24mm), heaviest during Wed afternoon. Warm (max 21°C on Tue afternoon, min 14°C on Mon night). Winds decreasing (fresh winds from the ENE on Mon night, calm 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 9 | SW 13 | SW 13 | SW 13 | SSW 8 | SW 8 | SW 8 | S 4 | SSW 7 | WSW 5 | WSW 5 | SSW 6 | SSW 6 | SW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 8 | 8 | 8 | 8 | 7 | 8 | 8 | 3 | 7 | 7 | 7 | 7 | 17 | 15 | 13 | 50 | 156 | 62 | 35 | 24 | 12 |
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 | off | glassy | cross-off | cross-off | cross-off | off | cross-off | cross-on | cross-off | cross-on | cross-on | glassy | cross | cross | cross-on | cross-off |
High Tide | 6:23AM4.10m | 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 | 15 | 4 | — | 4 | — | — | — | — |
Temp °C | 14 | 14 | 14 | 15 | 15 | 18 | 19 | 20 | 20 | 19 | 21 | 19 | 15 | 18 | 17 | 18 | 18 | 17 | 16 | 16 | 16 |
Feels °C | 10 | 10 | 11 | 13 | 12 | 15 | 17 | 17 | 15 | 18 | 17 | 14 | 13 | 18 | 14 | 16 | 19 | 17 | 14 | 15 | 15 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 10 | S 4 | SW 13 | SW 8 | SW 8 | NE 5 | SW 8 | SW 8 | SSW 7 | SSW 7 | NE 4 | SSW 8 | SSW 6 | SSW 6 | SW 6 |
| kJ | 8 | 8 | 8 | 8 | 7 | 7 | 4 | 1 | 7 | 3 | 3 | 16 | 17 | 15 | 11 | 50 | 1 | 7 | 35 | 24 | 10 |
Swell 2 Height (m) Direction Period (s) | — | — | S 12 | SW 14 | — | SW 11 | SW 14 | SW 9 | SW 9 | SW 13 | — | SSW 8 | SSE 4 | — | S 12 | S 12 | — | — | WNW 4 | S 11 | SSW 11 |
| kJ | — | — | 3 | 8 | — | 5 | 8 | 3 | 3 | 7 | — | 7 | 1 | — | 3 | 3 | — | — | 1 | 3 | 12 |
Swell 3 Height (m) Direction Period (s) | — | — | W 12 | — | — | SW 14 | — | NE 4 | — | NE 5 | SW 13 | S 13 | NNE 4 | NE 4 | W 12 | SW 12 | — | — | NNW 5 | — | — |
| kJ | — | — | 3 | — | — | 8 | — | 1 | — | 1 | 7 | 3 | 2 | 1 | 3 | 5 | — | — | 3 | — | — |
Wind waves Height (m) Direction Period (s) | NNW 5 | NNW 5 | N 5 | NNW 4 | NNW 4 | NE 2 | — | — | ENE 3 | ENE 5 | NE 5 | ESE 3 | SE 3 | SSE 2 | S 4 | — | WSW 5 | WSW 5 | — | NNW 2 | WSW 3 |
| kJ | 25 | 24 | 16 | 6 | 3 | 1 | — | — | 4 | 15 | 12 | 2 | 1 | 1 | 13 | — | 156 | 62 | — | 1 | 3 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 187 | 284 | 187 | 273 | 301 | 163 | 246 | 249 | 208 | 276 | 249 | 267 | 267 | 284 | 210 | 186 | 0 | 8 | 51 | 328 | 167 |
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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