Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 24 Jul 2026:
- Most powerful swell: Sunday 26 Jul, 10AM (local time) - 5ft (1.5m), 5s period, WNW swell with 117 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 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 0.5m 4s period and expected on Thursday (Jul 30) at 4PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Sun 26th Jul) | 5ft (1.5m) 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's on the menu for the next couple of weeks around Trearddur Bay.
Well, I gotta be straight with you – this is a proper dry spell. We're looking at a long stretch of flat or near-flat conditions with no decent surf on offer. The first recommendation for a surfable wave doesn't show up until... well, it's a long wait. There's a significant gap of several days where the call is just "poor surf conditions" across the board. The water's a touch warmer than normal for this time of year at 61°, but that's about the only good news.
Forget the first week. The wind is all over the shop, mostly onshore or cross-onshore, and the swell is tiny. We're looking at a combined energy reading of just 3 to 5 on the 24th, which is weak. The swell period on the 24th is 13 seconds, which is a long period, but with a height of 0.3 ft, it's nothing. You'll be bobbing around for nothing.
The only real glimmer of hope, and I'm calling it a long shot, comes around the 5th and 6th of August. The 5th of August morning shows a 5 ft swell from the SSW, with a combined energy of 170 (moderate), but it's caught in a fresh cross-onshore breeze from the W at 22 mph, making it lumpy. The afternoon cleans up a bit with a moderate breeze, 4 ft swell, and energy jumps to 237, but it's still cross-onshore. That's the biggest swell of the forecast, but the wind is a problem. For a beginner spot, 5 ft is already pushing it, and the conditions are rough. Honestly, with that wind and chop, it's looking more like a kite-surfing setup than a paddle session.
The 6th of August drops off again. So, if you're desperate, there's a chance on the 5th of August afternoon for a bigger, messier wave, but it's far from ideal. The rest of the window is a write-off. Hang tight, and keep an eye on the forecasts – things can change.
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). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Very mild (max 19°C on Tue afternoon, min 14°C on Mon morning). Winds decreasing (fresh winds from the SSW on Tue morning, light winds from the ESE 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 | S 13 | W 4 | SW 4 | WSW 4 | WNW 5 | WNW 5 | NW 4 | NW 4 | SSW 4 | SSW 5 | SSW 5 | SSW 5 | SW 5 | SW 4 | SSW 3 | SW 4 | SSW 4 | SW 4 | NE 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3 | 3 | 3 | 14 | 29 | 13 | 117 | 44 | 28 | 15 | 18 | 75 | 48 | 44 | 26 | 4 | 4 | 9 | 1 | 1 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-off | cross-off | glassy | cross-off | cross-on |
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 | 17 | 16 | 17 | 17 | 16 | 17 | 17 | 14 | 17 | 16 | 18 | 19 | 18 | 17 | 19 | 18 | 20 | 22 | 21 |
Feels °C | 13 | 14 | 16 | 13 | 15 | 16 | 11 | 12 | 12 | 11 | 13 | 12 | 14 | 15 | 15 | 15 | 17 | 15 | 19 | 21 | 21 |
Swell 1 Height (m) Direction Period (s) | N 4 | NW 3 | — | S 12 | NW 4 | S 11 | — | SW 6 | SW 6 | NW 4 | N 4 | — | — | — | SW 5 | — | — | SW 4 | NNW 4 | SW 4 | NE 4 |
| kJ | 3 | 2 | — | 3 | 5 | 2 | — | 15 | 5 | 15 | 1 | — | — | — | 17 | — | — | 9 | 1 | 1 | 4 |
Swell 2 Height (m) Direction Period (s) | S 13 | S 13 | S 13 | — | S 12 | — | — | — | — | — | — | — | — | — | — | — | — | — | SSW 4 | SW 4 | N 4 |
| kJ | 3 | 3 | 3 | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | SW 3 | W 4 | SW 4 | WSW 4 | WNW 5 | WNW 5 | NW 4 | SSW 5 | SSW 4 | SSW 5 | SSW 5 | SSW 5 | SW 5 | SW 4 | SSW 3 | — | — | N 4 | — |
| kJ | — | — | 2 | 14 | 29 | 13 | 117 | 44 | 28 | 3 | 18 | 75 | 48 | 44 | 26 | 4 | 4 | — | — | 7 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 415 | 1515 | 251 | 1103 | 376 | 235 | 589 | 517 | 192 | 246 | 251 | 251 | 309 | 235 | 246 | 246 | 249 | 249 | 249 | 249 | 88 |
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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