Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 26 Jul 2026:
- Most powerful swell: Sunday 26 Jul, 10AM (local time) - 5ft (1.5m), 6s period, WNW swell with 129 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 1.5m 6s and forecast to arrive on Sunday (Jul 26) at 10AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 5s period and expected on Monday (Jul 27) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Sun 26th Jul) | 5ft (1.5m) 6s |
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 about Trearddur Bay. I’ve looked over the next couple of weeks, and honestly, it’s a rough stretch for paddle surfing. There are no good surf options in the entire 16-day window.
Right off the bat on Saturday the 25th, we’ve got a weak 3 ft swell from the WSW, but with a short 4-second period and a moderate breeze blowing onshore from the SW, it’s just messy. The combined energy is only a paltry 30, so there’s no grunt to it. The water’s 62°, which is a touch warmer than normal for this time of year, but that’s small comfort when the waves are junk.
Sunday the 26th brings a bit more size, up to 5 ft from the WNW, but the period is still short at 6 seconds and the wind is a fresh cross-onshore at 22 mph. The energy bumps up to 153, which is moderate, but it’s lumpy and ugly—definitely not one for the log. That trend of poor conditions just keeps rolling. Monday and Tuesday are the same story: small, onshore, and generally uninspiring with energy readings mostly below 30.
We hit a bit of an improvement on Friday the 31st, with light cross-offshore breezes and clean conditions, but the swell is tiny—only 2 ft at best. You could probably cruise a foamie around, but don’t expect a real wave.
The first week of August doesn’t offer much hope either. There’s a small bump on Saturday the 1st with a 4 ft SW swell (energy 95), but it’s blown out by a fresh onshore wind. And then from the 5th through the 9th, the energy drops into the single digits and teens, with a few 0.3 ft to 0.7 ft pulses that are barely a ripple. Even a long-period swell on the 6th (13 seconds) has zero power behind it.
This is one of those blank runs that’s pretty normal for the area when the stars don’t align. The setups here are mostly beach and reef, so with the significant wind and poor quality, this looks more interesting for kite surfing than paddle surfing. Don’t hang your hopes on this forecast; it tends not to stay this poor for long, so check back with me in a few days.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Sat afternoon. Very mild (max 19°C on Mon night, min 14°C on Mon morning). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 21°C on Wed afternoon, min 15°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Sat 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | ||||||||||||||
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) | WSW 4 | SW 4 | WNW 6 | WNW 5 | NW 5 | WNW 4 | SW 4 | SW 5 | SSW 4 | SSW 4 | SW 4 | — | SW 3 | SW 5 | NW 4 | SW 4 | SW 6 | SW 6 | SW 5 | SSW 4 |
Wave Graph  | ||||||||||||||||||||
 kJ | 24 | 31 | 129 | 94 | 53 | 13 | 28 | 27 | 16 | 25 | 6 | 0 | 2 | 33 | 18 | 12 | 47 | 17 | 7 | 22 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross-on | cross | on | on | on | cross-on | cross-on | cross-on | cross-on | on | on | cross-on | cross | glassy | cross-off | cross-off | off |
High Tide | 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 | 11:54AM5.05m | 00:03AM5.49m | 12:26PM5.10m | 00:36AM5.52m | |||||||
Low Tide | 3:07AM1.98m | 3:25PM1.90m | 3:54AM1.74m | 4:07PM1.71m | 4:33AM1.50m | 4:44PM1.52m | 5:08AM1.29m | 5:17PM1.36m | 5:41AM1.11m | 5:50PM1.23m | 6:14AM0.99m | 6:23PM1.15m | ||||||||
 |  |  |  |  | | |  | | |  | | | | | | | | | | |
 | — | — | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — | 5:28 | — | — | 5:30 | — | — | 5:31 | — | — |
 | — | 9:25 | — | — | 9:23 | — | — | 9:22 | — | — | 9:21 | — | — | 9:19 | — | — | 9:17 | — | — | 9:15 |
mm | 1 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 17 | 15 | 17 | 17 | 15 | 18 | 19 | 19 | 20 | 19 | 20 | 21 | 19 | 16 | 18 | 18 | 15 | 16 | 16 |
Feels °C | 15 | 16 | 9 | 13 | 12 | 11 | 15 | 18 | 16 | 17 | 17 | 19 | 20 | 18 | 13 | 16 | 15 | 13 | 13 | 15 |
Swell 1 Height (m) Direction Period (s) | S 12 | — | SW 6 | SW 6 | SW 6 | WNW 4 | N 5 | WNW 3 | — | — | SW 4 | — | — | — | SW 5 | NW 4 | SW 6 | SW 6 | — | — |
| kJ | 3 | — | 24 | 23 | 5 | 13 | 2 | 1 | — | — | 4 | — | — | — | 13 | 4 | 47 | 17 | — | — |
Swell 2 Height (m) Direction Period (s) | S 12 | — | — | — | — | NNW 5 | — | — | — | — | — | — | — | — | — | — | — | NW 4 | — | — |
| kJ | 3 | — | — | — | — | 8 | — | — | — | — | — | — | — | — | — | — | — | 4 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WSW 4 | SW 4 | WNW 6 | WNW 5 | NW 5 | SW 4 | SW 4 | SW 5 | SSW 4 | SSW 4 | SW 4 | — | SW 3 | SW 5 | NW 4 | SW 4 | WNW 3 | — | SW 5 | SSW 4 |
| kJ | 24 | 31 | 129 | 94 | 53 | 8 | 28 | 27 | 16 | 25 | 6 | — | 2 | 33 | 18 | 12 | 5 | — | 7 | 22 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 376 | 309 | 565 | 548 | 326 | 251 | 251 | 246 | 267 | 246 | 249 | 275 | 264 | 219 | 192 | 548 | 8 | 189 | 292 | 163 |
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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