Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 8 Aug 2026:
- Most powerful swell: Saturday 8 Aug, 4PM (local time) - 2ft (0.6m), 4s period, SSW swell with 9 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 0.6m 4s and forecast to arrive on Saturday (Aug 08) at 4PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Saturday (Aug 15) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Sat 8th Aug) | 2ft (0.6m) 4s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's be straight with you – if you're looking at Trearddur Bay (Holy Island) over this next stretch, you're going to want to keep your expectations in the gutter for a while. The forecast is a long, flat run of poor surf conditions. We’re looking at a solid stretch of days with nothing worth paddling out for.
The water is sitting at 62.2°F, which is a touch warmer than usual for this time of year, so that’s one small comfort.
Saturday, August 8th kicks things off with a weak and short-period 2ft SSW swell. The cross-on wind will have it chopped up and messy. Not your friend. The next several days, right through to Thursday, August 13th, are flat and tiny. We’re talking ankle-biters with periods all over the place, mostly under 0.7ft. The wind is light, but it's mostly onshore or cross, which just adds a bit of texture to the nothing. This is a long drought, no two ways about it.
Friday, August 14th sees a slight pulse of energy, a 2.6ft WNW, but it’s wind-blown and cross-choppy. Still not rideable. The weekend stays small and junky. By Monday, August 17th, the wind howls from the S at 19 mph, making things lumpy and horrible.
There is a bit of a bump on Wednesday, August 19th – the swell picks up to 3.9ft to 4.6ft from the WNW with moderate energy (87 and 105). But it's short-period windswell, and the fresh cross-shore wind will have it a complete mess. For a beach setup like this, that’s more of a kite-surfing day than a paddle-surfing day.
The silver lining, and it's a distant one, is around Saturday, August 22nd. We finally see some clean conditions with a cross-offshore breeze, and the swell builds to around 3.6ft. But the period is a weak 5 seconds, so it'll be soft and crumbly. It’s the best of a bad bunch, but still not a standout. The long-period swell energy (15 seconds) that shows up on the 20th and 21st is just too small at 0.3ft to do anything with, and it's prone to being too straight for the beach break anyway.
So, in short, the next two weeks are a write-off for decent surf. The only period that even looks like it might offer a clean wave is the 22nd, but it's a weak, short-period swell. Keep the board in the car, but maybe don’t bother taking it out.
Short Range ForecastMostly dry. Very mild (max 18°C on Sun night, min 14°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Thu night. Warm (max 23°C on Wed afternoon, min 17°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | |||||||||||||||
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) | SSW 4 | SSW 4 | SW 4 | S 12 | SSW 6 | S 10 | S 8 | SSW 6 | SSW 6 | SW 6 | SW 6 | S 11 | SW 12 | SSW 4 | SSW 4 | SW 3 | SW 11 | SW 4 | SW 4 | SSW 5 | SW 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 8 | 9 | 6 | 3 | 6 | 2 | 1 | 3 | 4 | 1 | 1 | 2 | 6 | 6 | 3 | 4 | 5 | 2 | 5 | 2 | 1 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross-on | on | cross-off | cross | cross-off | off | cross-on | on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross | cross-on | cross | cross-off |
High Tide | 7:05PM4.57m | 7:47AM4.68m | 8:27PM4.80m | 9:03AM4.91m | 9:30PM5.16m | 10:01AM5.19m | 10:21PM5.51m | 10:50AM5.42m | 11:07PM5.78m | 11:35AM5.56m | 11:49PM5.94m | 12:16PM5.58m | 00:30AM5.96m | ||||||||
Low Tide | 12:38PM1.85m | 1:25AM1.83m | 1:59PM1.77m | 2:41AM1.51m | 3:06PM1.52m | 3:41AM1.10m | 4:01PM1.21m | 4:33AM0.72m | 4:48PM0.94m | 5:19AM0.45m | 5:32PM0.74m | 6:02AM0.32m | 6:14PM0.67m | ||||||||
 |  |  | | | | | |  | | | | | | | | |  |  | | | |
 | 5:45 | — | — | 5:47 | — | — | 5:48 | — | — | 5:50 | — | — | 5:52 | — | — | 5:54 | — | — | 5:54 | — | — |
 | — | — | 9:00 | — | 8:59 | — | — | 8:57 | — | — | 8:54 | — | — | 8:52 | — | — | 8:51 | — | — | 8:49 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — |
Temp °C | 15 | 17 | 16 | 16 | 17 | 18 | 15 | 16 | 17 | 21 | 22 | 21 | 22 | 23 | 23 | 21 | 21 | 20 | 18 | 19 | 16 |
Feels °C | 12 | 13 | 12 | 16 | 15 | 17 | 12 | 12 | 14 | 18 | 20 | 19 | 18 | 20 | 20 | 20 | 20 | 20 | 18 | 19 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 11 | S 11 | SW 7 | SW 3 | SSW 6 | SW 3 | SW 4 | SSW 6 | SSW 6 | SW 6 | SW 6 | SSW 4 | SW 12 | SW 12 | SW 9 | SW 8 | SW 8 | SW 4 | SW 4 | SSW 5 | SW 5 |
| kJ | 5 | 2 | 2 | 2 | 3 | 2 | 1 | 3 | 4 | 1 | 1 | 2 | 6 | 6 | 3 | 3 | 3 | 2 | 5 | 2 | 1 |
Swell 2 Height (m) Direction Period (s) | — | — | S 11 | SW 6 | — | SW 6 | SW 6 | SW 8 | — | — | — | SW 6 | S 6 | — | SW 5 | SW 10 | SW 11 | SW 6 | — | — | — |
| kJ | — | — | 2 | 2 | — | 1 | 1 | 2 | — | — | — | 1 | 1 | — | 1 | 4 | 4 | 2 | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | S 11 | S 12 | SW 12 | S 10 | S 8 | — | — | — | — | S 11 | S 6 | SW 12 | SW 5 | — | SW 11 | SW 8 | — | — | — |
| kJ | — | — | 2 | 3 | 6 | 2 | 1 | — | — | — | — | 2 | 1 | 5 | 1 | — | 5 | 2 | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 4 | SSW 4 | SW 4 | — | — | NNW 2 | NNW 3 | NNW 4 | — | SSE 3 | — | — | SSW 3 | SSW 4 | SSW 4 | SW 3 | SSW 3 | — | NW 3 | N 3 | N 3 |
| kJ | 8 | 9 | 6 | — | — | 1 | 2 | 3 | — | 1 | — | — | 4 | 6 | 3 | 2 | 1 | — | 2 | 1 | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 246 | 251 | 246 | 249 | 251 | 251 | 251 | 275 | 246 | 280 | 306 | 182 | 235 | 186 | 155 | 179 | 255 | 179 | 192 | 514 | 195 |
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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