Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 9 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 1.2m 6s period and expected on Saturday (Jul 11) 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.
Alright, let's take a look at what's cookin' for Trearddur Bay.
I gotta be honest, the next two weeks are looking pretty flat out here. We're in for a long dry spell. From now all the way through to the 20th of July, there's just no surf on the table. We're talking tiny little waves, barely 0.3ft, and even though the wind is mostly cross or cross-off, there's nothing to push you around on.
The first real chance of a wave shows up on Monday the 21st, but it's not pretty. We get a small bump of about 3ft from the WNW, but the period is a short, weak 5 seconds, and the wind is cross-onshore, turning it into a choppy mess. The combined energy is only 49 (moderate), so it's a blown-out, lumpy option. Come Tuesday the 22nd, the onshore wind cranks up, and the waves are still small and junky. Honestly, this setup looks more fun for a kite than a paddle board.
The only standout? It's not much, but the best of the bunch is the morning of the 20th. There's a 4ft swell from the NW, with a 5-second period, and the wind is a clean cross-off. The combined energy is 59 (moderate), which is the highest we'll see. The water temp is about average for the time of year, right around 59°F, nothing crazy. It's still small, short-period stuff, but for a beginner, it might be the only time you can get a few ankle-biters without the wind messing it up. Crowds are sometimes a problem at Trearddur Bay, but on a day this weak, I doubt many will be out.
After that, it's a slow slide back into tiny, windy junk. So, if you're itching, the 20th is your window. Otherwise, I'd keep the board in the bag.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Sat night. Warm (max 24°C on Sat afternoon, min 16°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 22°C on Tue afternoon, min 15°C on Sun night). Mainly fresh winds. | ||||||||||||||||||||
Thu 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | WNW 3 | — | — | N 3 | N 5 | NNW 6 | NNW 5 | N 5 | NE 5 | NE 4 | NE 5 | NE 5 | S 19 | S 15 | S 18 | SW 18 | SW 14 | SW 16 | SW 16 | S 16 | SW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 4 | 6 | 12 | 7 | 10 | 10 | 7 | 8 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | off | cross-off | cross-off | off | cross-off | cross-off | off | off | off | off | cross-off | cross-off |
High Tide | 6:12PM4.58m | 6:36AM4.79m | 7:23PM4.67m | 7:51AM4.85m | 8:33PM4.86m | 9:01AM5.02m | 9:34PM5.14m | 10:03AM5.23m | 10:28PM5.42m | 10:57AM5.41m | 11:18PM5.67m | 11:48AM5.52m | 00:06AM5.82m | 12:36PM5.53m | |||||||
Low Tide | 00:24AM1.81m | 1:00PM1.53m | 1:36AM1.68m | 2:09PM1.44m | 2:44AM1.43m | 3:11PM1.28m | 3:45AM1.10m | 4:08PM1.09m | 4:40AM0.77m | 4:59PM0.91m | 5:31AM0.52m | 5:47PM0.80m | 6:20AM0.38m | ||||||||
 |  | | |  |  | | | | | | | | | | | |  | | | | |
 | — | — | 5:03 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — | 5:09 |
 | — | 9:44 | — | — | 9:43 | — | — | 9:43 | — | — | 9:42 | — | — | 9:40 | — | — | 9:39 | — | — | 9:38 | 9:37 |
mm | — | — | — | — | 1 | — | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 18 | 17 | 21 | 22 | 20 | 23 | 24 | 21 | 21 | 21 | 21 | 18 | 20 | 20 | 21 | 22 | 21 | 19 | 21 | 19 | 20 |
Feels °C | 16 | 16 | 19 | 20 | 17 | 23 | 22 | 17 | 18 | 17 | 15 | 12 | 15 | 14 | 18 | 17 | 15 | 15 | 18 | 17 | 18 |
Swell 1 Height (m) Direction Period (s) | SW 4 | — | — | — | — | NNW 6 | NNW 5 | N 5 | — | — | — | — | S 19 | S 15 | S 18 | SW 18 | S 6 | SW 6 | SSW 7 | SSW 6 | SSW 6 |
| kJ | 1 | — | — | — | — | 55 | 20 | 20 | — | — | — | — | 7 | 4 | 6 | 12 | 1 | 1 | 4 | 4 | 4 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | NE 5 | — | — | — | S 7 | SW 14 | — | SW 16 | SW 13 | SW 14 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | 1 | 7 | — | 10 | 7 | 8 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 14 | SW 16 | S 13 | S 16 | SW 14 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 7 | 10 | 3 | 5 | 8 |
Wind waves Height (m) Direction Period (s) | WNW 3 | — | — | N 3 | N 5 | — | NE 4 | — | NE 5 | NE 4 | NE 5 | NE 5 | NE 4 | NE 5 | NE 5 | NE 5 | NE 4 | NE 5 | NE 4 | NNE 5 | NNE 5 |
| kJ | 1 | — | — | 3 | 69 | — | 2 | — | 13 | 25 | 19 | 19 | 40 | 25 | 17 | 17 | 11 | 19 | 31 | 18 | 27 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 234 | 184 | 179 | 179 | 187 | 249 | 249 | 249 | 287 | 208 | 284 | 410 | 208 | 275 | 249 | 249 | 249 | 208 | 210 | 299 | 208 |
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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