Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 25 Jul 2026:
- Most powerful swell: Sunday 26 Jul, 1PM (local time) - 4.5ft (1.3m), 6s period, WNW swell with 105 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 6s and forecast to arrive on Sunday (Jul 26) at 1PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 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 | 1PM (Sun 26th Jul) | 4.5ft (1.3m) 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 – this is a tough one for the Holy Island area. We’ve got a 16-day window ahead, and honestly, it’s a bit of a desert out there for surf.
Right now, we’re looking at Trearddur Bay on Holy Island. The water is sitting at 62°, which is a touch warmer than what we’d normally expect for this time of year. The outlook, though, is grim. From Saturday the 25th of July right through to the morning of Saturday the 1st of August, we’re looking at a solid 8-day stretch of near-zero surf. The swell is tiny, the wind is mostly onshore or cross-onshore, and the combined energy is weak – barely cracking 20 for most of it. Sunday the 26th of July has the biggest swell of that whole period at 4 ft, but it’s coming from the WNW with a fresh 22 mph cross-onshore wind, making it lumpy and messy. Not worth paddling out for.
The combined energy values are all in the low two-digit range, meaning the ocean just doesn’t have any grunt. It’s a frustrating start.
We do get a bit of a reprieve from Thursday the 30th of July. The morning shows a small 3 ft swell from the WNW, but the key is a light 6 mph cross-offshore wind from the NNW. That’s clean. The combined energy is still only 29, so it’s weak, but it’s surfable. The afternoon drops to 1 ft, but it’s also clean. Friday the 31st of July is similar – tiny clean waves with a moderate breeze. These are the best conditions we’ll see, but they’re for the longboard or a floaty funboard, not for a proper session.
The first week of August is barren again. Saturday the 1st and Sunday the 2nd of August have near-zero surf. The afternoon of the 2nd turns glassy, but with a 0.7 ft swell, it’s a millpond. Monday the 3rd of August brings a tiny 0.3 ft swell with a very long period of 8 seconds from the SW, and a light offshore breeze – clean, but you’ll be drifting.
The one standout, if you can call it that, is Tuesday the 4th of August. The morning shows a 1 ft swell from the SW, with a moderate 16 mph offshore wind from the NE. The combined energy is 15 – still weak, but the wind is clean and the period is 8 seconds. This is the most promising window in the whole 16 days, but it’s still only for the small-wave gear. After that, it’s back to tiny, messy, or onshore slop through to the 9th of August.
Overall, this is a blank run. There are no standout sessions, no proper swell, and no real quality. For an area like this, a dry spell is normal, but it’s a tough watch. Keep your eyes on the charts, because it can’t stay this flat forever.
Rusty.
Short Range ForecastSome drizzle, heaviest during Sat afternoon. Very mild (max 19°C on Mon night, min 14°C on Sun night). Winds increasing (light winds from the SSW on Sat afternoon, fresh winds from the WNW by Sun afternoon). | Days 4-6 Weather SummaryMostly dry. Warm (max 20°C on Tue afternoon, min 16°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | |||||||||||||||
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) | W 4 | SW 4 | SW 4 | WNW 5 | NW 5 | NW 5 | NW 4 | SW 4 | SSW 5 | SSW 5 | SSW 4 | SW 4 | — | — | SW 3 | WNW 4 | WNW 4 | SW 4 | SW 5 | SSW 5 | SW 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 17 | 26 | 16 | 69 | 76 | 74 | 16 | 23 | 17 | 19 | 22 | 5 | 0 | 0 | 1 | 29 | 6 | 5 | 4 | 3 | 1 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | cross-on | cross | cross | on | on | cross-on | cross-on | cross-on | cross-on | on | on | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-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 | 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 | 6:14AM0.99m | 6:23PM1.15m | ||||||||
 |  |  | |  |  | | | | | | | | | | | | | | | | |
 | 5:22 | — | — | 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 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 16 | 17 | 16 | 17 | 17 | 14 | 17 | 19 | 19 | 20 | 19 | 19 | 20 | 19 | 17 | 19 | 18 | 16 | 16 | 15 |
Feels °C | 12 | 14 | 14 | 10 | 10 | 12 | 11 | 14 | 18 | 16 | 17 | 17 | 18 | 19 | 19 | 16 | 17 | 16 | 13 | 12 | 10 |
Swell 1 Height (m) Direction Period (s) | S 12 | NW 4 | S 11 | SW 5 | SW 6 | SW 6 | NW 4 | N 4 | — | — | — | SW 4 | — | — | — | — | WNW 4 | — | SW 5 | SSW 5 | SW 4 |
| kJ | 3 | 5 | 2 | 16 | 23 | 5 | 16 | 2 | — | — | — | 5 | — | — | — | — | 6 | — | 4 | 3 | 1 |
Swell 2 Height (m) Direction Period (s) | S 12 | S 12 | — | — | — | — | NNW 5 | — | — | — | — | — | — | — | — | — | SW 6 | — | WNW 3 | — | — |
| kJ | 3 | 3 | — | — | — | — | 5 | — | — | — | — | — | — | — | — | — | 1 | — | 1 | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | W 4 | SW 4 | SW 4 | WNW 5 | NW 5 | NW 5 | SW 3 | SW 4 | SSW 5 | SSW 5 | SSW 4 | — | — | — | SW 3 | WNW 4 | — | SW 4 | — | — | — |
| kJ | 17 | 26 | 16 | 69 | 76 | 74 | 4 | 23 | 17 | 19 | 22 | — | — | — | 1 | 29 | — | 5 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 376 | 376 | 251 | 567 | 565 | 179 | 275 | 246 | 246 | 246 | 289 | 246 | 275 | 290 | 273 | 184 | 249 | 246 | 278 | 596 | 275 |
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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