Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 24 Jul 2026:
- Most powerful swell: Sunday 26 Jul, 10AM (local time) - 4.5ft (1.3m), 5s period, WNW swell with 80 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 1.3m 5s 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 0.6m 5s period and expected on Friday (Jul 31) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Sun 26th Jul) | 4.5ft (1.3m) 5s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Right folks, Rusty here. Let’s be straight with you – the next seven days are a write-off for Trearddur Bay (Holy Island). The swell is barely there, and when it does show a pulse, the wind is all over the shop. You’re looking at a long, flat spell until the very end of the 16-day window.
The water at Trearddur Bay is sitting at 61°, which is a touch warmer than normal for this time of year, but that’s about the only bit of good news.
Friday the 24th kicks off with a tiny 0.3ft south swell and a cross-on breeze – not even worth getting the wetsuit damp. Saturday the 25th sees a slight bump up to 2ft on the morning, but that’s a short-period 4-second windswell with moderate onshore wind, and the combined energy is a weak 23. It’s messy. Sunday the 26th gets a bit more height at 4ft from the WNW, but a fresh cross-on breeze at 22 mph makes it lumpy and unappealing. The energy hits 98, but it’s just not clean.
The whole first week is a dud. The swell drops back to nothing from the 30th right through to the 5th of August. There’s a few days of clean offshore winds on the 31st of July and the 1st of August, but with no swell to speak of, it’s just a flat, glassy lake. That’s a solid six-day gap with no surf.
Then, finally, on Friday the 7th of August, a proper swell rolls in. The afternoon sees a 7ft swell from the SSW with a 7-second period. The combined energy jumps to 394 – strong wave energy. The wind is light and onshore from the SW at 6 mph. That’s a big one, but at 7ft, it’s getting into expert territory, especially for a spot that’s fairly exposed. The onshore wind will keep it a bit lumpy.
Saturday the 8th follows up with a 6ft swell from the SW, still a 7-second period, and energy at 352. The morning has a gentle cross-on breeze, so it’s gonna be choppy. The afternoon has onshore wind again.
Look, the only standout here is the Friday afternoon on the 7th of August. If you’re an experienced surfer and you’ve been waiting, that’s your window. The swell is solid, but it’s not glassy. For the rest of us, it’s a long wait. Keep an eye on the forecasts, because a blank run like this usually doesn’t stick around forever.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Sat night. Very mild (max 17°C on Fri afternoon, min 14°C on Fri morning). Winds increasing (light winds from the SW on Fri night, fresh winds from the WNW by Sun morning). | Days 4-6 Weather SummaryMostly dry. Very mild (max 19°C on Wed afternoon, min 14°C on Mon morning). Winds decreasing (fresh winds from the SSW on Tue morning, calm by Wed night). | ||||||||||||||||||||
Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | |||||||||||||||
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) | S 13 | S 13 | SW 3 | SW 4 | SW 5 | WSW 5 | WNW 5 | WNW 5 | NW 5 | NW 5 | SSW 3 | SSW 5 | SSW 4 | SSW 4 | SW 5 | SW 4 | SSW 4 | SW 4 | — | — | N 3 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3 | 3 | 3 | 15 | 53 | 27 | 80 | 66 | 43 | 22 | 8 | 48 | 22 | 39 | 26 | 4 | 1 | 1 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | on | on | on | cross-on | cross-on | cross | cross | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross | cross-on | cross-on | off |
High Tide | 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 | 11:54AM5.05m | 00:03AM5.49m | ||||||||
Low Tide | 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 | 5:41AM1.11m | 5:50PM1.23m | ||||||||
 | |  |  | |  | |  |  | | |  | | | | | | | | | | |
 | 5:20 | — | — | 5:22 | — | — | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — | 5:28 | — | — | 5:30 | — | — |
 | — | — | 9:27 | — | — | 9:25 | — | — | 9:23 | — | — | 9:22 | — | — | 9:21 | — | — | 9:19 | — | — | 9:17 |
mm | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 17 | 16 | 16 | 17 | 17 | 16 | 17 | 17 | 15 | 17 | 16 | 17 | 18 | 17 | 18 | 19 | 18 | 18 | 18 | 17 |
Feels °C | 13 | 14 | 13 | 11 | 15 | 16 | 10 | 11 | 13 | 10 | 13 | 12 | 13 | 14 | 14 | 18 | 18 | 19 | 17 | 17 | 16 |
Swell 1 Height (m) Direction Period (s) | N 4 | NNW 4 | SW 3 | NW 4 | S 12 | S 11 | SW 5 | — | SW 6 | — | NNW 4 | — | — | — | — | SW 4 | SSW 4 | SW 4 | — | — | — |
| kJ | 3 | 1 | 3 | 5 | 3 | 2 | 18 | — | 5 | — | 2 | — | — | — | — | 4 | 1 | 1 | — | — | — |
Swell 2 Height (m) Direction Period (s) | S 13 | S 13 | — | S 12 | — | — | — | — | — | — | WNW 4 | — | — | — | — | — | — | — | — | — | — |
| kJ | 3 | 3 | — | 3 | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | WNW 3 | — | SW 4 | SW 5 | WSW 5 | WNW 5 | WNW 5 | NW 5 | NW 5 | SSW 3 | SSW 5 | SSW 4 | SSW 4 | SW 5 | — | — | — | — | — | N 3 |
| kJ | — | 1 | — | 15 | 53 | 27 | 80 | 66 | 43 | 22 | 8 | 48 | 22 | 39 | 26 | — | — | — | — | — | 2 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1515 | 1084 | 251 | 376 | 376 | 251 | 565 | 187 | 192 | 246 | 251 | 251 | 246 | 251 | 246 | 285 | 249 | 275 | 275 | 278 | 286 |
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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