Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 13 Jul 2026:
- Most powerful swell: Tuesday 14 Jul, 1PM (local time) - 0.5ft (0.1m), 18s period, SW swell with 12 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 18s and forecast to arrive on Tuesday (Jul 14) at 1PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 6s period and expected on Sunday (Jul 19) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Tue 14th Jul) | 0.5ft (0.1m) 18s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
G'day, I'm Rusty. Let's have a look at the surf forecast for Trearddur Bay (Holy Island).
Alright, mate, I'm gonna be straight with you. This 16-day outlook is a bit of a tough one. We're looking at a long stretch of flat, quiet conditions, so don't be expecting any fireworks. The first real chance of any surf doesn't pop up until the Monday morning of the 27th of July, which is over a week away. Before that, for the rest of July into the 26th, we've got next to nothing. It's a dead spell for paddle surfing, with the combined energy basically sitting at zero for days on end. The occasional tiny wave shows up, but it's just not enough to bother with.
For Trearddur Bay, this kind of long gap is a bit of a bummer, but it happens. The water temp is about average for the time of year, nothing to write home about.
Now, the one day that actually offers something is Monday the 27th of July. You'll see a bump in swell from the SW, with a combined energy of 106 (moderate wave energy). The swell height is 4 ft, which is doable for most, but it's got a short period of just 6 seconds, so it'll be a bit choppy and won't have much punch. The wind is a fresh cross-onshore from the SSW at 22 mph, which will make it lumpy and messy. It's not going to be clean, and that's a real shame.
Honestly, with that strong onshore wind and the short-period junk, this setup looks more interesting for kite surfing than paddle surfing. The Tuesday morning of the 28th of July is similar, with a drop in swell to 2 ft and a cross-onshore wind, so it's not a winner either.
So, there you have it. A long quiet spell, then one day of mediocre, windy surf. The best on offer is Monday the 27th of July, but it's a ragged, windblown mess. Keep your expectations low, and hopefully, the forecasts change for the better.
Rusty.
Short Range ForecastMostly dry. Warm (max 25°C on Wed afternoon, min 15°C on Sun night). Winds decreasing (fresh winds from the ENE on Tue night, light winds from the ENE by Wed morning). | Days 4-6 Weather SummaryMostly dry. Warm (max 25°C on Wed night, min 16°C on Sat morning). Wind will be generally light. | ||||||||||||||||||||
Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | |||||||||||||||
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) | NE 4 | S 19 | S 15 | S 18 | SW 18 | SW 14 | SW 16 | SW 16 | S 7 | SSW 6 | SW 14 | SW 14 | SSW 7 | SSW 7 | SSW 7 | SSW 6 | SSW 6 | S 11 | S 11 | S 10 | S 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 7 | 4 | 6 | 12 | 7 | 10 | 10 | 1 | 4 | 8 | 8 | 5 | 6 | 6 | 4 | 4 | 2 | 2 | 2 | 1 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | off | off | cross-off | off | off | cross-off | off | cross-off | cross-off | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 10:03AM5.23m | 10:28PM5.42m | 10:57AM5.41m | 11:18PM5.67m | 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 | |||||||
Low Tide | 4:08PM1.09m | 4:40AM0.77m | 4:59PM0.91m | 5:31AM0.52m | 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 | ||||||||
 | |  | | | | | | | | |  | | | | |  | | | | | |
 | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — |
 | — | — | 9:40 | — | — | 9:39 | — | — | 9:38 | — | — | 9:37 | — | — | 9:36 | — | — | 9:35 | — | — | 9:34 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 18 | 20 | 18 | 19 | 22 | 22 | 24 | 25 | 25 | 22 | 23 | 20 | 21 | 22 | 20 | 16 | 18 | 18 | 17 | 18 | 17 |
Feels °C | 12 | 14 | 12 | 14 | 17 | 16 | 22 | 20 | 19 | 18 | 18 | 17 | 18 | 18 | 17 | 13 | 15 | 16 | 12 | 14 | 13 |
Swell 1 Height (m) Direction Period (s) | — | S 19 | S 15 | S 18 | SW 18 | S 7 | S 6 | S 6 | SE 4 | NE 4 | SSW 6 | SW 5 | SSW 7 | SSW 7 | SSW 7 | SSW 6 | SSW 6 | SW 6 | NNW 5 | SW 5 | S 5 |
| kJ | — | 7 | 4 | 6 | 12 | 1 | 1 | 1 | 1 | 2 | 3 | 1 | 5 | 5 | 4 | 4 | 4 | 1 | 36 | 1 | 1 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | SW 14 | SE 4 | SW 16 | S 6 | SSW 6 | SW 14 | SW 12 | S 5 | SW 12 | SW 12 | S 11 | S 11 | S 11 | SW 6 | S 10 | — |
| kJ | — | — | — | — | — | 7 | 1 | 10 | 1 | 4 | 8 | 6 | 1 | 6 | 6 | 2 | 2 | 2 | 1 | 2 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | SW 16 | — | S 7 | — | — | SW 14 | S 12 | — | — | — | — | — | S 11 | — | — |
| kJ | — | — | — | — | — | — | 10 | — | 1 | — | — | 8 | 3 | — | — | — | — | — | 2 | — | — |
Wind waves Height (m) Direction Period (s) | NE 4 | NNE 4 | NE 4 | NE 4 | NNE 4 | NE 5 | NE 5 | NE 4 | ENE 5 | — | NE 4 | NNE 4 | NNE 3 | NNE 3 | N 3 | N 4 | N 4 | N 6 | — | N 4 | N 4 |
| kJ | 19 | 32 | 17 | 17 | 28 | 28 | 14 | 15 | 21 | — | 10 | 9 | 2 | 3 | 3 | 8 | 4 | 62 | — | 13 | 6 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 410 | 328 | 286 | 184 | 208 | 288 | 184 | 208 | 304 | 219 | 326 | 267 | 326 | 565 | 350 | 350 | 580 | 59 | 273 | 284 | 273 |
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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