Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 15 Jul 2026:
- Most powerful swell: Wednesday 15 Jul, 7PM (local time) - 0.5ft (0.1m), 16s period, SW swell with 10 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 0.1m 16s and forecast to arrive on Wednesday (Jul 15) at 7PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 6s period and expected on Wednesday (Jul 22) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7PM (Wed 15th Jul) | 0.5ft (0.1m) 16s |
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 cookin’ for the next couple of weeks.
Honestly, I’m looking at Trearddur Bay (Holy Island) and it’s a pretty bleak picture for the foreseeable future. The water is sitting at 62°, which is a touch warmer than normal for this time of year, but that’s about the only thing that’s slightly out of the ordinary. The real issue is we’ve got a long stretch of tiny, weak surf and poor conditions ahead.
The forecast kicks off Wednesday the 15th with a tiny 0.3ft SW swell, but it’s got a long 16 second period. Don’t let that fool you though, the wave energy is a measly 11. It’s just not enough to get excited about. The morning has a clean offshore breeze from the ENE at 9 mph, which would be perfect if there was any wave to surf. The afternoon lightens up even more to a 3 mph NNE cross-off, but still, it’s flat.
Thursday the 16th through to the end of the month is pretty much a write-off. We’re looking at days of 0.3ft or even no swell at all, with the combined energy barely registering. The winds are mostly cross-off or cross-shore, which is clean, but without any real swell, it’s just a flat lake. This spot is described as "inconsistent" and "rarely breaks," and this run is a perfect example of why. It’s a proper blank run, and for this area, that’s not unusual.
There is a tiny flicker way out on Thursday the 30th of July. The morning shows a 4ft short-period swell from the west, but it’s only 4 seconds and a weak 78 energy. Plus, it’s coming with a 12 mph onshore wind from the SW, making it choppy and messy. The afternoon drops to 2ft and 38 energy, with a cross-onshore wind. It’s still rated as poor surf conditions. That’s 16 days away, so don’t pin your hopes on it.
The only real standout, if you can call it that, is the Wednesday morning on the 15th. For a beginner, that 0.3ft glassy, clean surf with offshore winds might be enough for a float, but it’s not a wave you’d write home about. Just don’t expect any power or shape.
Bottom line: don’t bother packing the boards for a while. The forecast can change, but right now, it’s a long, flat spell. Keep an eye on it, but I’d be finding something else to do for the next couple of weeks.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Wed morning, min 13°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 17°C on Sun afternoon, min 13°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | |||||||||||||||
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) | SW 16 | SW 16 | S 16 | SW 6 | SW 14 | SSW 7 | SSW 6 | SSW 6 | SW 12 | S 11 | S 11 | S 11 | S 11 | S 10 | N 5 | NNW 5 | NNW 5 | N 6 | NNW 5 | NNW 4 | N 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 10 | 10 | 7 | 1 | 8 | 8 | 4 | 6 | 6 | 2 | 2 | 2 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | off | off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 11:48AM5.52m | 00:06AM5.82m | 12:36PM5.53m | 00:52AM5.87m | 1:23PM5.44m | 1:37AM5.79m | 2:08PM5.28m | 2:22AM5.60m | 2:52PM5.06m | 3:07AM5.33m | 3:38PM4.82m | 3:53AM5.01m | 4:26PM4.58m | ||||||||
Low Tide | 5:47PM0.80m | 6:20AM0.38m | 6:34PM0.77m | 7:08AM0.38m | 7:20PM0.84m | 7:55AM0.51m | 8:05PM1.00m | 8:41AM0.77m | 8:50PM1.23m | 9:27AM1.09m | 9:37PM1.52m | 10:16AM1.45m | 10:29PM1.82m | ||||||||
 | |  |  |  |  | | | | | | | | | | | | | | | | |
 | 5:07 | — | — | 5:09 | — | — | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — | 5:15 | — | — | 5:16 | — | — |
 | — | — | 9:38 | — | — | 9:37 | — | — | 9:36 | — | — | 9:35 | — | — | 9:34 | — | — | 9:32 | — | — | 9:30 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 22 | 23 | 22 | 22 | 21 | 20 | 20 | 18 | 15 | 16 | 16 | 16 | 17 | 16 | 14 | 16 | 16 | 17 | 18 | 17 |
Feels °C | 23 | 22 | 20 | 19 | 18 | 18 | 15 | 15 | 16 | 10 | 12 | 13 | 12 | 13 | 13 | 11 | 13 | 13 | 14 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | NE 4 | SW 6 | SSW 6 | SW 6 | SW 6 | SSW 7 | SSW 6 | SSW 6 | SW 6 | SW 6 | S 5 | S 11 | S 11 | S 10 | — | — | — | — | NNW 5 | — | — |
| kJ | 3 | 2 | 4 | 1 | 1 | 5 | 4 | 4 | 1 | 1 | 1 | 2 | 2 | 2 | — | — | — | — | 20 | — | — |
Swell 2 Height (m) Direction Period (s) | S 6 | SW 16 | SW 13 | — | SW 14 | SW 12 | S 12 | SW 12 | SW 12 | S 11 | S 11 | S 5 | — | — | — | — | — | — | — | — | — |
| kJ | 1 | 10 | 7 | — | 8 | 6 | 3 | 6 | 6 | 2 | 2 | 1 | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | SW 16 | S 13 | S 16 | SE 4 | S 7 | SW 14 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 10 | 3 | 5 | 1 | 1 | 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | NE 4 | NE 4 | — | NE 3 | NNE 3 | N 4 | NNW 3 | N 4 | NNW 5 | NNW 5 | N 6 | NNW 5 | NNW 4 | N 5 | NNW 5 | NNW 5 | N 6 | — | NNW 4 | N 4 |
| kJ | — | 4 | 6 | — | 5 | 3 | 7 | 4 | 4 | 43 | 56 | 77 | 18 | 14 | 22 | 45 | 33 | 77 | — | 7 | 7 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 312 | 184 | 219 | 314 | 208 | 267 | 326 | 1277 | 273 | 284 | 284 | 277 | 284 | 284 | 273 | 284 | 382 | 267 | 305 | 306 | 273 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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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