Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 28 Jul 2026:
- Most powerful swell: Wednesday 29 Jul, 1AM (local time) - 3.5ft (1.1m), 5s period, SW swell with 72 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 1.1m 5s and forecast to arrive on Wednesday (Jul 29) at 1AM. 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 Tuesday (Aug 04) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1AM (Wed 29th Jul) | 3.5ft (1.1m) 5s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright, Rusty here. Let's have a look at what's comin' our way.
Alright, straight up: don't get your hopes up too soon. The next week and a half is a tough one for Trearddur Bay (Holy Island). We're lookin' at a long, dry spell with hardly any surf worth paddling out for. The first real pulse of energy doesn't show up until around the 11th of August, so there's a solid gap of nearly two weeks of flat or tiny, messy conditions.
The first bit of action kicks off on Tuesday the 11th of August. We finally see some southwest swell pushing in at 5 ft, with a period of 6 seconds. It's not the cleanest – a light cross-onshore breeze will be rippling the surface. The combined energy gets up to a moderate 196, so there's a bit of push behind it, but the short period means it'll be a bit fat and crumbly. That water temp is sitting at 62°, which is a touch warmer than usual for this time of year, so you can leave the thick rubber at home.
The standouts, if you can call 'em that, are on Wednesday the 12th of August. Swell builds to 6 ft from the SSW, with period still hanging around 6 to 7 seconds. The combined energy jumps to 266 in the morning and 332 in the afternoon. That's a solid moderate punch. The wind stays a gentle cross-onshore, so it'll be a bit lumpy, but not a total mess. For a spot that's been dead for two weeks, this is the best we've got. It's a fairly exposed beach setup, so it'll be handling all that southwest energy. If you're a beginner, that 6 ft might be a bit much when it's this short-period and lumpy. For the experienced crew, it's worth a paddle.
Before that, Trearddur Bay is pretty much a write-off. Crowds are only sometimes an issue here, but they won't be a problem because nobody will be out. The run from the 28th of July through to the 10th of August is dominated by tiny swell, cross-onshore winds, and a lot of "poor surf conditions" in the data. There are a few glassy and clean moments – like the morning of the 2nd of August with a glassy SSE breeze and the 3rd with clean offshore winds – but the swell is just not there to make it count. The 9th of August has a bit of a pulse at 2 ft, but it's weak and cross-onshore. You'll be better off doing something else.
So, keep your eyes on the 11th and 12th of August. That's your window. It's not perfect, but it's the only real surf on offer.
Rusty.
Short Range ForecastSome drizzle, heaviest during Wed afternoon. Very mild (max 18°C on Wed afternoon, min 13°C on Thu night). Winds decreasing (strong winds from the SSW on Tue afternoon, light winds from the WSW by Thu afternoon). | Days 5-7 Weather SummarySome drizzle, heaviest during Fri night. Very mild (max 17°C on Fri night, min 12°C on Sat morning). Wind will be generally light. | |||||||||||||||||||
Tue 28 | Wednesday 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | ||||||||||||||
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) | SSW 5 | SW 5 | SSW 4 | SSW 4 | SW 5 | W 4 | NW 4 | SW 4 | WSW 3 | SSW 3 | SW 5 | WNW 4 | NW 3 | SW 4 | SSW 3 | N 3 | SW 10 | SW 9 | SW 8 | SW 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 125 | 72 | 22 | 21 | 17 | 15 | 8 | 3 | 3 | 7 | 21 | 5 | 3 | 3 | 1 | 0 | 4 | 3 | 11 | 10 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross | cross-on | on | on | on | cross-on | cross | cross-on | on | cross-on | glassy | cross-off | off | cross-off | cross-off | cross-off |
High Tide | 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 | 1:32PM5.12m | 1:43AM5.48m | 2:07PM5.09m | 2:20AM5.40m | |||||||
Low Tide | 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 | 7:20AM0.89m | 7:31PM1.14m | 7:56AM0.93m | 8:09PM1.21m | |||||||
 |  | |  |  |  | | | | |  | | | |  | |  | | | | |
 | — | — | 5:28 | — | — | 5:30 | — | — | 5:31 | — | — | 5:33 | — | — | 5:35 | — | — | 5:37 | — | — |
 | — | 9:21 | — | — | 9:19 | — | — | 9:17 | — | — | 9:15 | — | — | 9:14 | — | — | 9:12 | — | — | 9:10 |
mm | — | — | — | 1 | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 17 | 17 | 18 | 15 | 14 | 16 | 16 | 14 | 15 | 17 | 13 | 15 | 15 | 16 | 17 | 16 | 14 | 15 | 14 |
Feels °C | 12 | 13 | 13 | 13 | 13 | 10 | 13 | 13 | 11 | 10 | 16 | 10 | 11 | 11 | 15 | 14 | 13 | 12 | 12 | 12 |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | SW 5 | — | NW 4 | SW 4 | N 4 | WNW 3 | SW 5 | SW 4 | NW 3 | SW 4 | SSW 3 | — | SW 10 | SW 9 | SW 8 | SW 8 |
| kJ | — | — | — | — | 17 | — | 8 | 3 | 1 | 1 | 21 | 2 | 3 | 3 | 1 | — | 4 | 3 | 11 | 10 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | SW 4 | — | NNW 3 | — | — | — | WSW 5 | — | — | — | N 3 | — | N 3 | NNW 3 |
| kJ | — | — | — | — | — | — | 5 | — | 1 | — | — | — | 2 | — | — | — | 1 | — | 1 | 1 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SSW 5 | SW 5 | SSW 4 | SSW 4 | WNW 2 | W 4 | — | — | WSW 3 | SSW 3 | — | WNW 4 | SSW 5 | — | — | N 3 | — | — | — | — |
| kJ | 125 | 72 | 22 | 21 | 1 | 15 | — | — | 3 | 7 | — | 5 | 2 | — | — | 2 | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 251 | 246 | 249 | 246 | 246 | 548 | 587 | 285 | 292 | 289 | 323 | 357 | 368 | 246 | 246 | 285 | 178 | 192 | 314 | 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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