Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 4 Jul 2026:
- Most powerful swell: Saturday 4 Jul, 4PM (local time) - 3.5ft (1.1m), 5s period, SW swell with 65 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 Saturday (Jul 04) at 4PM. Winds are predicted to be 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 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Sat 4th Jul) | 3.5ft (1.1m) 5s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
Updates in hr min s Forecast update imminent
Alright, let's talk about Trearddur Bay on Holy Island.
To be honest, the next couple of weeks are a bit of a bust. There’s just no meaningful swell on the cards, and when there is a tiny bit, the wind ruins it. This happens here sometimes, so don’t get too down about it.
The first few days are a write-off. Saturday the 4th has a 3ft SW windswell, but it’s got a terrible 5-second period and a nasty 19 mph onshore wind. The energy reading is a weak 46, so it’s all chop and no shape. Sunday the 5th and Monday the 6th are even smaller, dropping to 2ft with more onshore wind. Just leave it.
The swell vanishes entirely from the 7th right through to the 14th. You’ll see some nice offshore winds here and there, keeping the water glassy, but with no waves, there’s nothing to ride. That’s a solid week of flat calm.
The only tiny flicker of hope is Tuesday afternoon the 14th. A tiny 0.3ft swell from the SW, with a very long 18-second period, drifts in. The energy is only 14, so it’s weak, but the cross-offshore wind will keep it clean. It’s just too small to surf. Later, on Thursday the 16th afternoon, you get a really glassy surface with a similar tiny bit of swell. That’s as good as it gets, and it’s still just a ripple.
No spot stands out here. The main problem is a total lack of swell. My advice is to wait for the next forecast.
Rusty
Short Range ForecastMostly dry. Warm (max 20°C on Sat afternoon, min 15°C on Fri night). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 24°C on Thu afternoon, min 15°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Saturday 4 | Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | |||||||||||||||
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 5 | SW 5 | WSW 5 | SW 6 | SW 4 | SSW 4 | SW 5 | SSW 3 | WSW 4 | NW 4 | SW 3 | SW 4 | NW 4 | WNW 3 | SW 4 | S 11 | — | — | — | — | N 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 41 | 65 | 37 | 20 | 10 | 6 | 12 | 8 | 16 | 8 | 2 | 3 | 3 | 1 | 1 | 3 | 0 | 0 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | on | on | on | on | on | on | on | cross-on | cross-on | cross-on | cross-on | cross-off | off | off | off | off | off | cross-off |
High Tide | 2:00PM4.84m | 2:11AM5.22m | 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 | ||||||||
Low Tide | 7:47AM1.17m | 7:58PM1.45m | 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 | |||||||
 | |  | | | | | | |  | |  | | | |  | | | | | | |
 | 4:56 | — | — | 4:58 | — | — | 4:58 | — | — | 5:00 | — | — | 5:00 | — | — | 5:01 | — | — | 5:03 | — | — |
 | — | — | 9:46 | — | — | 9:46 | — | — | 9:45 | — | — | 9:45 | — | — | 9:45 | — | — | 9:44 | — | — | 9:43 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 20 | 19 | 18 | 20 | 19 | 17 | 19 | 20 | 18 | 20 | 20 | 19 | 20 | 21 | 23 | 24 | 23 | 28 | 27 | 26 |
Feels °C | 14 | 16 | 16 | 16 | 17 | 17 | 15 | 16 | 19 | 15 | 18 | 18 | 18 | 19 | 21 | 22 | 23 | 19 | 28 | 26 | 20 |
Swell 1 Height (m) Direction Period (s) | NW 4 | — | — | NW 4 | WNW 4 | SSW 4 | NW 4 | — | — | NW 4 | NW 4 | SW 4 | SSW 4 | WNW 3 | SW 4 | S 11 | — | — | — | — | — |
| kJ | 5 | — | — | 3 | 1 | 6 | 3 | — | — | 8 | 2 | 3 | 1 | 1 | 1 | 3 | — | — | — | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | NW 4 | — | NW 4 | — | — | — | SW 4 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | 3 | — | 1 | — | — | — | 5 | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | S 12 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 3 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 5 | SW 5 | WSW 5 | SW 6 | SW 4 | NW 4 | SW 5 | SSW 3 | WSW 4 | — | SW 3 | — | NW 4 | — | — | — | — | — | — | — | N 4 |
| kJ | 41 | 65 | 37 | 20 | 10 | 4 | 12 | 8 | 16 | — | 2 | — | 3 | — | — | — | — | — | — | — | 39 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 192 | 548 | 192 | 251 | 305 | 292 | 251 | 347 | 323 | 236 | 368 | 246 | 246 | 249 | 246 | 249 | 252 | 249 | 275 | 288 | 155 |
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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