Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 5 Jul 2026:
- Most powerful swell: Sunday 5 Jul, 4PM (local time) - 2.5ft (0.8m), 4s period, SW swell with 21 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 0.8m 4s and forecast to arrive on Sunday (Jul 05) at 4PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Saturday (Jul 11) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Sun 5th Jul) | 2.5ft (0.8m) 4s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
Updates in hr min s Forecast update imminent
Alright, I’m gonna level with you. It’s been a grim stretch lately, and looking ahead over the next 16 days, there’s barely a blip on the radar worth getting excited about.
Let’s start with Trearddur Bay (Holy Island). This spot is a beginner-friendly, fairly exposed bay that likes a swell from the SW. But for the first week, the story is all about tiny, weak, and messy conditions. The wind is mostly onshore or cross-onshore, pushing those little bumps around. The combined energy of all swells directed here is barely registering, often just a 15 or 21, which is about as weak as it gets. There’s a brief period on the morning of Thursday, July 9th, where a 0.3 ft swell from the S with a long period of 11 seconds and clean cross-offshore winds pops up, but that’s about all the energy a tadpole would need. The water temp is about average for the time of year, nothing to write home about.
After that, it’s a long, dry spell. From the afternoon of Friday, July 10th, right through until the afternoon of Sunday, July 19th, there’s a massive gap with zero rideable surf. The data shows nothing but zeros and “poor surf conditions” day after day. The wind is often clean and offshore, but there’s simply no swell to push.
Late on Sunday, July 19th, we get a tiny flicker: a 1 ft swell from the WNW with a short period of 3 seconds, but it’s under onshore wind and again, the combined energy is a pathetic 2. That’s not surf, that’s a lake ripple.
Honestly, for the entire 16-day forecast, there is not a single standout. The best option is the tiny, clean window on Thursday morning, July 9th, but even that is barely a paddle. If you’re desperate, you might get a float on a log, but for a proper wave, you’re waiting for a change in the weather pattern. It’s a tough run for the area.
Rusty.
Short Range ForecastMostly dry. Warm (max 20°C on Tue afternoon, min 14°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 22°C on Thu afternoon, min 18°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | |||||||||||||||
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) | WSW 4 | SW 4 | SW 4 | NW 4 | SW 3 | SSW 4 | NW 4 | WNW 4 | S 12 | SSW 3 | — | — | S 11 | WNW 3 | — | S 10 | NNW 3 | N 5 | N 5 | NNW 5 | NNW 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 13 | 21 | 17 | 4 | 4 | 13 | 8 | 2 | 3 | 1 | 0 | 0 | 3 | 1 | 0 | 2 | 0 | 0 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | on | on | on | on | on | cross-on | cross-on | on | on | glassy | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 2:38PM4.79m | 2:50AM5.14m | 3:21PM4.72m | 3:35AM5.04m | 4:10PM4.65m | 4:27AM4.93m | 5:07PM4.59m | 5:27AM4.83m | 6:12PM4.58m | 6:36AM4.79m | 7:23PM4.67m | 7:51AM4.85m | 8:33PM4.86m | ||||||||
Low Tide | 8:25AM1.20m | 8:38PM1.52m | 9:07AM1.25m | 9:23PM1.62m | 9:55AM1.33m | 10:15PM1.72m | 10:50AM1.43m | 11:15PM1.80m | 11:52AM1.51m | 00:24AM1.81m | 1:00PM1.53m | 1:36AM1.68m | 2:09PM1.44m | 2:44AM1.43m | |||||||
 | |  | |  |  | | | | | | | | | | | | | | | | |
 | 4:58 | — | — | 4:58 | — | — | 5:00 | — | — | 5:00 | — | — | 5:01 | — | — | 5:03 | — | — | 5:03 | — | — |
 | — | — | 9:46 | — | — | 9:45 | — | — | 9:45 | — | — | 9:45 | — | — | 9:44 | — | — | 9:43 | — | — | 9:43 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 17 | 19 | 19 | 17 | 19 | 19 | 18 | 20 | 20 | 19 | 21 | 21 | 21 | 22 | 20 | 22 | 22 | 19 | 17 | 19 | 21 |
Feels °C | 15 | 17 | 17 | 15 | 16 | 18 | 15 | 17 | 17 | 18 | 19 | 19 | 18 | 20 | 18 | 19 | 19 | 16 | 13 | 15 | 19 |
Swell 1 Height (m) Direction Period (s) | NW 4 | — | — | NW 4 | WNW 3 | SSW 4 | NW 4 | WNW 4 | S 12 | — | — | — | — | WNW 3 | — | S 10 | — | — | — | — | NNW 4 |
| kJ | 2 | — | — | 4 | 1 | 13 | 8 | 1 | 3 | — | — | — | — | 1 | — | 2 | — | — | — | — | 3 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | SW 4 | — | — | — | — | — | S 11 | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | 4 | — | — | — | — | — | 3 | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WSW 4 | SW 4 | SW 4 | SW 4 | SW 3 | WNW 3 | — | SSW 4 | SSW 3 | SSW 3 | — | — | — | — | — | — | NNW 3 | N 5 | N 5 | NNW 5 | — |
| kJ | 13 | 21 | 17 | 4 | 4 | 1 | — | 2 | 2 | 1 | — | — | — | — | — | — | 4 | 27 | 55 | 24 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 195 | 305 | 285 | 292 | 251 | 251 | 251 | 356 | 246 | 246 | 246 | 249 | 249 | 308 | 241 | 184 | 179 | 189 | 187 | 328 | 249 |
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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