Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 26 Aug 2026:
- Most powerful swell: Saturday 29 Aug, 7PM (local time) - 6.5ft (2.0m), 8s period, SSW swell with 429 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 2.0m 8s and forecast to arrive on Saturday (Aug 29) at 7PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Friday (Aug 28) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Sat 29th Aug) | 6.5ft (2.0m) 8s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright, this is Rusty. Let’s break down what’s coming up for Trearddur Bay (Holy Island).
Honestly, the next week and a half is a total loss for any decent paddle surfing. Wednesday 27th August morning has a tiny 0.3 ft swell, and even with a light breeze, there’s just no power. The forecast shows a long stretch of poor surf conditions right through until the morning of Friday 4th September. That’s a solid gap of about a week with nothing worth paddling out for. The swell energy is tiny (22) and when it’s not tiny, the wind is howling onshore, making a mess of things. You’d be better off with a kite if that’s your game, because the cross-onshore winds on Saturday 29th August are blowing 18 mph with a lumpy 5.6 ft swell (combined energy 218), but it’s all chop and no shape for a surfboard.
Now, the one bright spot might be early Friday 4th September. The morning brings a cleaner picture: a gentle northerly cross-offshore breeze will tidy up a 3.6 ft swell from the SW. It’s short-period (5 seconds) and the energy is modest (74), but it’ll be clean. The water temperature is about average for this time of year. Keep in mind Trearddur Bay is inconsistent, so windows like this are rare – don’t sleep on it. It’s surfable but very ordinary. For a beginner-friendly spot, that’s about as good as it gets in this outlook.
Saturday 5th September morning has a glassy start with no wind and a 0.3 ft swell from the SW but a very long period of 14 seconds. The energy is almost nil (16), so it’s a flat spell, not a session.
That’s the story here, folks. A long dry spell, a brief clean-up on Friday the 4th, then back to waiting. Hope the forecasts shift.
Short Range ForecastHeavy rain (total 31mm), heaviest during Thu afternoon. Warm (max 22°C on Wed afternoon, min 16°C on Tue night). Winds increasing (light winds from the SSE on Wed morning, fresh winds from the SSW by Thu night). | Days 4-6 Weather SummaryHeavy rain (total 24mm), heaviest during Sun morning. Very mild (max 18°C on Sat morning, min 13°C on Mon morning). Winds decreasing (strong winds from the S on Sat morning, light winds from the NW 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 | SW 8 | SSW 7 | SW 7 | SSW 6 | SSW 6 | SSW 7 | SSW 9 | SW 9 | SW 8 | SSW 7 | WNW 5 | SW 4 | SW 6 | SW 7 | SW 7 | SSW 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 17 | 12 | 5 | 6 | 4 | 16 | 77 | 96 | 114 | 218 | 222 | 362 | 110 | 64 | 36 | 35 | 34 | 164 | 158 | 67 | 29 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | cross-off | off | on | cross-on | on | cross-on | cross-on | on | cross-on | cross-on | cross-on | cross | cross-on | on | cross-on | cross-on | cross-on | 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 | 4:11AM1.47m | 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 | — | — | — | — | 14 | 16 | — | — | 7 | 5 | 1 | — | 6 | 3 | 1 | — | 1 | — | — | — | 2 |
Temp °C | 19 | 22 | 21 | 20 | 17 | 16 | 17 | 17 | 17 | 18 | 17 | 16 | 16 | 16 | 16 | 15 | 17 | 17 | 16 | 16 | 17 |
Feels °C | 18 | 21 | 20 | 19 | 15 | 13 | 17 | 16 | 13 | 12 | 13 | 11 | 13 | 12 | 14 | 9 | 13 | 14 | 13 | 10 | 14 |
Swell 1 Height (m) Direction Period (s) | SW 8 | SSW 8 | SSW 7 | SSW 7 | SSW 7 | SW 8 | SSW 7 | N 4 | — | — | — | SSW 9 | SW 9 | SW 8 | SSW 7 | SW 7 | — | — | SW 7 | SW 7 | SSW 7 |
| kJ | 17 | 12 | 5 | 5 | 4 | 16 | 77 | 10 | — | — | — | 362 | 110 | 64 | 36 | 23 | — | — | 158 | 67 | 29 |
Swell 2 Height (m) Direction Period (s) | SSE 4 | NE 5 | — | — | S 12 | S 3 | — | — | — | — | — | — | WNW 4 | WNW 4 | — | SW 10 | — | — | — | NW 4 | NNW 5 |
| kJ | 2 | 3 | — | — | 3 | 1 | — | — | — | — | — | — | 6 | 1 | — | 4 | — | — | — | 11 | 4 |
Swell 3 Height (m) Direction Period (s) | S 13 | — | S 12 | SW 12 | — | — | — | — | — | — | — | — | NNW 4 | NNW 4 | — | — | — | — | — | — | — |
| kJ | 3 | — | 3 | 6 | — | — | — | — | — | — | — | — | 4 | 2 | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | ENE 5 | — | NNE 3 | NE 5 | NE 3 | N 4 | NNW 5 | SW 7 | SSW 6 | SSW 6 | SSW 7 | N 4 | — | — | — | WNW 5 | SW 4 | SW 6 | WNW 4 | — | — |
| kJ | 9 | — | 1 | 6 | 4 | 9 | 27 | 96 | 114 | 218 | 222 | 8 | — | — | — | 35 | 34 | 164 | 20 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 253 | 303 | 275 | 249 | 249 | 117 | 210 | 51 | 283 | 318 | 101 | 101 | 59 | 280 | 179 | 388 | 348 | 51 | 251 | 251 | 289 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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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