Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 23 Jul 2026:
- Most powerful swell: Saturday 25 Jul, 4PM (local time) - 3ft (0.9m), 5s period, WSW swell with 37 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 0.9m 5s and forecast to arrive on Saturday (Jul 25) 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 1.1m 6s period and expected on Thursday (Jul 23) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Sat 25th Jul) | 3ft (0.9m) 5s |
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 on Holy Island is cooking up for us over the next couple of weeks, and I gotta be straight with you – it’s looking pretty grim.
Right off the bat, there’s nothing doing. We’ve got a dry spell that runs from now all the way through to the morning of Saturday, July 26th, with no real surf to speak of. The wind’s all over the shop and the wave heights are just sad.
You want a standout? There isn’t one. Honestly, the whole 16-day window is a write-off for a proper surf. Nothing gets above a 0 out of 10 on the scoreboard, and the combined wave energy never cracks into triple digits until much later, but even then the quality is smashed by the wind.
The only slight flicker of life happens on Sunday, August 2nd, with a morning pulse. We see swell jump to about 4 ft coming from the NW with a period of 5 seconds. The combined energy hits 112 (moderate), but that’s where the good news ends. The wind is a cross-onshore fresh breeze from the WSW at 16 mph, so it’s gonna be a lumpy, choppy mess. That’s more of a kite-surf afternoon than a clean paddle session.
At the start of the second week, Monday, August 3rd, we get a brief window of clean conditions. The wind shifts light NNW, going cross-offshore, which would normally get my heart racing. But sadly, the swell is tiny, only 1 ft from the SW. It’s clean, sure, but there’s no power behind it. A bit of a tease.
Beyond that, flatness returns. A few tiny pulses appear on August 4th and 6th with long-period groundswell (12-13 seconds) but again, heights are barely 0.3 ft and the wind is messy. The water is sitting about average for the time of year, which is standard for these parts, but won't make any difference when there's nothing to ride.
Overall, this is a proper flat spell for Trearddur Bay. It’s a quiet stretch. Still, this area can turn around quick, so don’t write it off forever. Just not our fortnight.
Stay dry,
Rusty
Short Range ForecastSome drizzle, heaviest during Sat afternoon. Very mild (max 17°C on Wed night, min 13°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Sat night. Very mild (max 17°C on Sun night, min 14°C on Mon morning). Winds increasing (light winds from the NW on Sun night, fresh winds from the SSW by Tue afternoon). | ||||||||||||||||||||
Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | |||||||||||||||
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) | N 6 | N 5 | N 5 | S 13 | S 13 | S 13 | W 4 | WSW 5 | WSW 4 | WNW 4 | NW 4 | NW 4 | WNW 4 | WNW 3 | SSW 4 | SSW 4 | SSW 4 | SW 4 | SW 4 | SSW 3 | SW 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 3 | 3 | 4 | 20 | 37 | 16 | 35 | 22 | 9 | 5 | 1 | 10 | 12 | 10 | 14 | 3 | 2 | 4 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | cross-on | on | cross-on | on | on | cross-on | cross | cross | cross | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | on | cross |
High Tide | 5:49AM4.42m | 6:33PM4.31m | 7:10AM4.28m | 7:50PM4.38m | 8:27AM4.33m | 8:53PM4.58m | 9:25AM4.48m | 9:42PM4.82m | 10:10AM4.66m | 10:22PM5.05m | 10:47AM4.83m | 10:57PM5.25m | 11:21AM4.96m | 11:31PM5.40m | |||||||
Low Tide | 12:17PM2.03m | 00:48AM2.22m | 1:29PM2.12m | 2:05AM2.17m | 2:34PM2.05m | 3:07AM1.98m | 3:25PM1.90m | 3:54AM1.74m | 4:07PM1.71m | 4:33AM1.50m | 4:44PM1.52m | 5:08AM1.29m | 5:17PM1.36m | ||||||||
 |  |  | | | |  |  |  | | | | | | | | |  | | | | |
 | 5:20 | — | — | 5:20 | — | — | 5:22 | — | — | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — | 5:28 | — | — |
 | — | — | 9:28 | — | — | 9:27 | — | — | 9:25 | — | — | 9:23 | — | — | 9:22 | — | — | 9:21 | — | — | 9:19 |
mm | — | — | — | — | — | — | — | 1 | 4 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 16 | 15 | 14 | 17 | 16 | 15 | 16 | 15 | 16 | 16 | 17 | 14 | 16 | 16 | 17 | 17 | 17 | 18 | 20 | 18 |
Feels °C | 12 | 13 | 13 | 13 | 15 | 13 | 12 | 13 | 14 | 13 | 14 | 16 | 11 | 11 | 12 | 13 | 12 | 14 | 17 | 18 | 16 |
Swell 1 Height (m) Direction Period (s) | — | — | N 5 | N 4 | N 4 | — | S 12 | S 12 | S 11 | SW 6 | SW 6 | SW 6 | NNW 4 | N 4 | — | — | — | — | — | — | SW 4 |
| kJ | — | — | 18 | 6 | 1 | — | 3 | 3 | 2 | 15 | 8 | 5 | 6 | 3 | — | — | — | — | — | — | 4 |
Swell 2 Height (m) Direction Period (s) | — | — | — | S 13 | S 13 | S 13 | S 12 | — | — | — | — | — | SW 6 | WNW 3 | — | — | — | — | — | — | — |
| kJ | — | — | — | 3 | 3 | 3 | 3 | — | — | — | — | — | 1 | 1 | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | N 6 | N 5 | NNE 2 | — | — | WSW 3 | W 4 | WSW 5 | WSW 4 | WNW 4 | NW 4 | NW 4 | WNW 4 | SW 6 | SSW 4 | SSW 4 | SSW 4 | SW 4 | SW 4 | SSW 3 | — |
| kJ | 77 | 47 | 1 | — | — | 4 | 20 | 37 | 16 | 35 | 22 | 9 | 5 | 1 | 10 | 12 | 10 | 14 | 3 | 2 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 280 | 578 | 246 | 1084 | 1081 | 388 | 376 | 376 | 235 | 8 | 187 | 179 | 246 | 249 | 246 | 246 | 251 | 246 | 249 | 249 | 246 |
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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