Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 6 Aug 2026:
- Most powerful swell: Thursday 6 Aug, 7AM (local time) - 4.5ft (1.3m), 5s period, NW swell with 96 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 Thursday (Aug 06) at 7AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 5s period and expected on Thursday (Aug 06) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7AM (Thu 6th Aug) | 4.5ft (1.3m) 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 cards for the next couple of weeks.
Honestly, it’s a pretty tough stretch ahead. We’re looking at a real flat spell with no decent surf to speak of for the entire 16-day forecast window. The first recommendation doesn’t come through until August 6th, and even then, it’s a grim one.
The only spot on the radar is Trearddur Bay (Holy Island). It’s an inconsistent, beginner-friendly setup that’s fairly exposed to the southwest, which is the direction it really wants. But through the whole period, the conditions are just poor. The combined swell energy is weak, barely cracking 77 (for weak energy) on the morning of the 6th, and it quickly drops to single or double digits from there. The wind is nearly always cross or onshore, killing any chance of a clean wave. The swell is tiny, rarely getting above 2ft, and when it does, it’s short-period windswell, not the long-period groundswell that would make it worthwhile.
There are no standouts. Not a single window of clean, rideable surf. The water temperature is about average for the time of year, but that’s cold comfort when there’s nothing to ride. This is one of those blank runs that’s more normal for the area when the conditions don’t line up. The forecasts can change, but as it sits right now, my advice is to leave the boards in the car and maybe find something else to do for the next two weeks.
Rusty.
Short Range ForecastMostly dry. Very mild (max 17°C on Sat afternoon, min 13°C on Wed night). Winds decreasing (fresh winds from the WNW on Wed night, light winds from the W by Thu night). | Days 4-6 Weather SummaryMostly dry. Warm (max 23°C on Tue afternoon, min 16°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | |||||||||||||||
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) | NW 5 | SW 6 | SW 4 | SW 4 | S 12 | SSW 4 | SSW 4 | SSW 4 | SW 4 | SSW 4 | SSW 6 | SSW 3 | SW 6 | W 3 | SW 6 | S 11 | SW 6 | S 11 | S 12 | SW 12 | SW 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 65 | 5 | 14 | 6 | 3 | 12 | 8 | 13 | 14 | 8 | 6 | 1 | 1 | 1 | 1 | 2 | 1 | 2 | 3 | 5 | 7 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | glassy | cross-off | cross-off | off | cross-off | on | cross-on | cross-on | cross-on | cross-on |
High Tide | 4:26PM4.70m | 4:55AM4.80m | 5:37PM4.56m | 6:16AM4.64m | 7:05PM4.57m | 7:47AM4.68m | 8:27PM4.80m | 9:03AM4.91m | 9:30PM5.16m | 10:01AM5.19m | 10:21PM5.51m | 10:50AM5.42m | 11:07PM5.78m | ||||||||
Low Tide | 10:13AM1.46m | 10:41PM1.77m | 11:18AM1.72m | 11:58PM1.91m | 12:38PM1.85m | 1:25AM1.83m | 1:59PM1.77m | 2:41AM1.51m | 3:06PM1.52m | 3:41AM1.10m | 4:01PM1.21m | 4:33AM0.72m | 4:48PM0.94m | ||||||||
 |  |  | | | | | | | | | | | | | | |  | | | | |
 | 5:41 | — | — | 5:43 | — | — | 5:45 | — | — | 5:47 | — | — | 5:48 | — | — | 5:50 | — | — | 5:52 | — | — |
 | — | — | 9:05 | — | — | 9:02 | — | — | 9:00 | — | 8:59 | — | — | 8:57 | — | — | 8:54 | — | — | 8:52 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 15 | 16 | 15 | 16 | 16 | 16 | 17 | 17 | 17 | 19 | 19 | 22 | 22 | 20 | 20 | 23 | 19 | 19 | 21 | 20 |
Feels °C | 10 | 12 | 15 | 13 | 12 | 12 | 11 | 11 | 12 | 14 | 17 | 18 | 20 | 20 | 18 | 19 | 21 | 16 | 16 | 20 | 18 |
Swell 1 Height (m) Direction Period (s) | SW 6 | N 5 | SW 4 | SW 4 | WNW 3 | SW 12 | SW 11 | S 11 | S 11 | S 12 | SSW 6 | SSW 3 | — | W 3 | SW 6 | SW 6 | NE 4 | SW 6 | S 12 | SW 12 | SW 8 |
| kJ | 9 | 12 | 14 | 5 | 1 | 5 | 5 | 2 | 2 | 3 | 4 | 1 | — | 1 | 1 | 1 | 1 | 1 | 3 | 5 | 3 |
Swell 2 Height (m) Direction Period (s) | S 13 | WNW 4 | N 4 | NW 3 | S 12 | W 12 | — | — | S 11 | SW 12 | SW 12 | SW 6 | SW 6 | SW 6 | — | — | SW 6 | S 11 | S 10 | SW 12 | SW 10 |
| kJ | 3 | 3 | 2 | 3 | 3 | 3 | — | — | 2 | 5 | 6 | 1 | 1 | 1 | — | — | 1 | 2 | 2 | 5 | 4 |
Swell 3 Height (m) Direction Period (s) | — | SW 6 | SW 12 | SW 12 | S 6 | — | — | — | — | — | SW 12 | — | — | — | — | S 11 | — | — | W 10 | SW 6 | — |
| kJ | — | 5 | 6 | 6 | 1 | — | — | — | — | — | 6 | — | — | — | — | 2 | — | — | 2 | 1 | — |
Wind waves Height (m) Direction Period (s) | NW 5 | SW 3 | — | — | SSW 4 | SSW 4 | SSW 4 | SSW 4 | SW 4 | SSW 4 | SW 3 | — | WNW 3 | — | — | — | — | — | SW 3 | SW 3 | SW 4 |
| kJ | 65 | 2 | — | — | 2 | 12 | 8 | 13 | 14 | 8 | 3 | — | 1 | — | — | — | — | — | 2 | 2 | 7 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 251 | 284 | 273 | 280 | 251 | 246 | 251 | 292 | 246 | 251 | 235 | 246 | 246 | 249 | 275 | 286 | 297 | 280 | 155 | 288 | 179 |
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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