Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 26 Jul 2026:
- Most powerful swell: Thursday 30 Jul, 7PM (local time) - 5ft (1.6m), 6s period, SW swell with 165 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 1.6m 6s and forecast to arrive on Thursday (Jul 30) at 7PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 5s period and expected on Monday (Jul 27) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Thu 30th Jul) | 5ft (1.6m) 6s |
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 this stretch of coast.
Right, straight up, I'm not gonna sugarcoat it. This is a tough outlook. The whole 16-day run is pretty much a write-off for any decent paddle surfing. We're looking at a long, quiet stretch with nothing but small, choppy, and generally poor conditions. The first recommendation doesn't kick in until the 26th of July, and honestly, it's not a good one.
For the first week, from the 26th of July through to the 3rd of August, it's a bust. Fresh winds, lumpy cross-shore chop, and tiny swell. The swell energy is next to nothing, with readings like 158 (weak) and dropping right down to single digits. The wind is a problem, mostly cross-on or onshore, and strong enough to mess up anything that might be there. There's a brief moment on the 5th of August where we get some clean, offshore winds from the NNE, but the swell is still small and weak. The water temperature is 62°F, which is a touch warmer than normal, but that's about the only positive.
The only spot on the cards is Trearddur Bay (Holy Island). It's a beginner-friendly, fairly exposed spot that's inconsistent, but it needs a good SW swell to work. The optimum swell direction is from the SW, and we get a bit of that on the 4th of August, with a 5ft swell from the SW and a period of 6 seconds, pushing the combined energy to 143 (moderate). But the wind on the 4th is cross-on or onshore, so it'll be messy. The 5th of August is the best we've got: a clean 3ft to 5ft SW swell with offshore and cross-off winds from the NNE. That's about as good as it gets. The period is short, around 5-6 seconds, so it's not gonna be a classic, but it'll be clean. The water's a touch warmer than average, so you won't need a thick suit.
Come the 8th of August, we see a bit more potential. A 3ft SSW swell with a 10-second period on the Saturday afternoon pushes the energy to 177 (moderate). But the wind is cross-shore, so not perfect. The 10th brings another clean offshore window, but the swell is tiny. For the rest of the second week, it's back to small, weak, and choppy.
To be honest, if you're looking to paddle, you're better off waiting for a better forecast. The setup with the wind and small swell on the 4th and 5th of August might be more interesting for the kite crew than us surfers. It's a long blank run, and in this area, that's pretty normal for this time of year. Forecasts can change, so keep an eye on it, but don't hold your breath.
Rusty.
Short Range ForecastMostly dry. Very mild (max 18°C on Mon afternoon, min 14°C on Mon morning). Winds decreasing (strong winds from the WNW on Sun morning, light winds from the S by Tue night). | Days 4-6 Weather SummarySome drizzle, heaviest during Wed night. Warm (max 20°C on Wed afternoon, min 13°C on Thu night). Winds increasing (light winds from the SW on Wed night, fresh winds from the SSW by Thu afternoon). | ||||||||||||||||||||
Sunday 26 | Monday 27 | Tuesday 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | |||||||||||||||
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) | WNW 6 | WNW 5 | NW 5 | WNW 4 | SW 4 | SW 5 | SSW 4 | SSW 5 | SW 5 | SW 4 | SW 3 | SW 5 | SSW 5 | SSW 4 | SW 6 | WNW 4 | SW 5 | SW 5 | WNW 4 | NW 4 | SW 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 134 | 97 | 43 | 13 | 29 | 27 | 34 | 77 | 25 | 4 | 1 | 25 | 18 | 40 | 46 | 16 | 7 | 28 | 10 | 4 | 4 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | on | on | cross-on | on | cross-on | cross-on | cross-on | on | on | cross-on | on | cross | cross-on | on | cross-on | cross-on | on | cross-on |
High Tide | 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 | 12:58PM5.13m | 1:09AM5.52m | ||||||||
Low Tide | 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 | 6:46AM0.92m | 6:56PM1.12m | ||||||||
 | |  |  | |  | | | |  | |  | | | | | | | | | | |
 | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — | 5:28 | — | — | 5:30 | — | — | 5:31 | — | — | 5:33 | — | — |
 | — | — | 9:23 | — | — | 9:22 | — | — | 9:21 | — | — | 9:19 | — | — | 9:17 | — | — | 9:15 | — | — | 9:14 |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 17 | 16 | 15 | 18 | 18 | 18 | 18 | 18 | 19 | 20 | 17 | 15 | 18 | 16 | 14 | 16 | 17 | 14 | 16 | 15 |
Feels °C | 10 | 12 | 11 | 11 | 15 | 17 | 14 | 13 | 15 | 17 | 18 | 14 | 11 | 13 | 11 | 11 | 10 | 12 | 12 | 12 | 11 |
Swell 1 Height (m) Direction Period (s) | SW 6 | SW 6 | SW 6 | WNW 4 | — | WNW 4 | — | — | SW 5 | SW 4 | — | — | SSW 5 | NW 4 | SW 6 | SW 6 | NW 4 | SW 5 | SW 4 | NW 4 | — |
| kJ | 24 | 23 | 5 | 13 | — | 1 | — | — | 13 | 2 | — | — | 17 | 2 | 46 | 11 | 3 | 28 | 7 | 3 | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | NNW 5 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 5 | — |
| kJ | — | — | — | 5 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WNW 6 | WNW 5 | NW 5 | SW 4 | SW 4 | SW 5 | SSW 4 | SSW 5 | SW 5 | SW 4 | SW 3 | SW 5 | NW 4 | SSW 4 | WNW 4 | WNW 4 | SW 5 | WNW 3 | WNW 4 | — | SW 4 |
| kJ | 134 | 97 | 43 | 11 | 29 | 27 | 34 | 77 | 25 | 4 | 1 | 25 | 18 | 40 | 9 | 16 | 7 | 1 | 10 | — | 4 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 584 | 517 | 179 | 251 | 235 | 246 | 251 | 246 | 246 | 267 | 288 | 278 | 292 | 586 | 193 | 192 | 251 | 407 | 187 | 323 | 246 |
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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