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 1.1m 5s period and expected on Saturday (Jul 11) at 1AM.
| 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 talk about Trearddur Bay. I'm not going to sugarcoat it – the outlook is a bit of a bummer. We're staring down a long stretch of nothing, starting right now and running through the middle of the month. The water is about 59°, which is pretty normal for this time of year, but that's about the only thing that's normal.
The only time you might want to grab your log is on the morning of Thursday, July 23rd. The wind is forecast to drop off to a glassy light breeze from the WNW, and there's a tiny 2ft wave showing up from the NW. It's got a short, choppy period of 4 seconds, so it's not going to be a world-class wave, but it's the only clean option we've got. The wave energy is weak (18). For a beginner-friendly spot like Trearddur Bay (Holy Island), it's the only thing that's even on the radar, and it's a real long shot.
The rest of the 16-day window is a write-off. You'll see a lot of days with offshore winds and no swell to speak of. It's a classic dry spell for this area, so don't let it get you down. Forecasts can change, but for now, there's not much to get excited about. Keep your eyes peeled.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Sat night. Warm (max 24°C on Sat afternoon, min 14°C on Thu morning). Winds increasing (light winds from the NW on Thu afternoon, fresh winds from the ENE by Sat night). | Days 4-6 Weather SummaryMostly dry. Warm (max 24°C on Tue afternoon, min 15°C on Sun night). Mainly fresh winds. | ||||||||||||||||||||
Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | |||||||||||||||
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) | S 11 | WNW 3 | — | N 3 | N 4 | N 5 | NNW 5 | NNW 5 | N 4 | NE 5 | NE 4 | NE 5 | NE 5 | S 19 | S 15 | S 18 | SW 18 | SW 14 | SW 16 | SW 16 | S 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 4 | 6 | 12 | 7 | 10 | 10 | 7 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | off | cross-off | cross-off | off | cross-off | off | off | cross-off | off | off | 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 | ||||||||
Low Tide | 11:52AM1.51m | 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 | ||||||||
 | |  | | |  |  | | | | | | | |  | | | |  |  | | |
 | 5:01 | — | — | 5:03 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — |
 | — | — | 9:44 | — | — | 9:43 | — | — | 9:43 | — | — | 9:42 | — | — | 9:40 | — | — | 9:39 | — | — | 9:38 |
mm | — | — | — | — | — | 1 | — | — | 4 | — | — | — | — | — | — | — | — | — | 1 | 4 | 1 |
Temp °C | 16 | 20 | 19 | 21 | 21 | 20 | 23 | 24 | 21 | 21 | 22 | 22 | 20 | 20 | 21 | 21 | 24 | 24 | 22 | 23 | 23 |
Feels °C | 15 | 19 | 17 | 19 | 18 | 17 | 23 | 23 | 18 | 17 | 17 | 16 | 14 | 13 | 15 | 16 | 20 | 19 | 20 | 21 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 3 | WNW 3 | — | — | — | — | NNW 5 | NNW 5 | N 4 | — | — | — | — | S 19 | S 15 | S 18 | SW 18 | N 5 | SW 16 | SW 16 | SW 13 |
| kJ | 1 | 1 | — | — | — | — | 21 | 8 | 14 | — | — | — | — | 7 | 4 | 6 | 12 | 4 | 10 | 10 | 7 |
Swell 2 Height (m) Direction Period (s) | S 11 | SW 4 | — | — | — | — | NE 4 | — | — | — | — | — | NE 5 | — | — | — | — | SW 14 | S 13 | S 5 | S 16 |
| kJ | 3 | 1 | — | — | — | — | 1 | — | — | — | — | — | 1 | — | — | — | — | 7 | 3 | 1 | 5 |
Swell 3 Height (m) Direction Period (s) | S 11 | — | — | — | — | — | — | — | — | — | — | — | — | S 15 | — | ESE 3 | S 14 | S 6 | S 6 | S 13 | — |
| kJ | 3 | — | — | — | — | — | — | — | — | — | — | — | — | 4 | — | 1 | 4 | 1 | 1 | 3 | — |
Wind waves Height (m) Direction Period (s) | — | — | — | N 3 | N 4 | N 5 | — | NE 4 | — | NE 5 | NE 4 | NE 5 | NE 5 | NE 4 | NE 5 | NE 5 | NE 4 | ENE 4 | NE 4 | NE 4 | NE 5 |
| kJ | — | — | — | 1 | 6 | 69 | — | 3 | — | 13 | 21 | 17 | 17 | 31 | 21 | 20 | 16 | 12 | 11 | 29 | 42 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 241 | 234 | 241 | 163 | 179 | 187 | 249 | 249 | 249 | 287 | 208 | 305 | 410 | 184 | 249 | 246 | 163 | 280 | 288 | 314 | 100 |
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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