Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 16 Jul 2026:
- Most powerful swell: Thursday 16 Jul, 10PM (local time) - 0.5ft (0.1m), 15s period, SW swell with 8 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 15s and forecast to arrive on Thursday (Jul 16) at 10PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Wednesday (Jul 22) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Thu 16th Jul) | 0.5ft (0.1m) 15s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright crew, Rusty here. Let’s break down Trearddur Bay for the next couple of weeks.
I’m not gonna sugarcoat it – this is a flat spell. We’re staring down an 8-day gap from Thursday 16th July all the way to the morning of Friday 24th July with nothing worth chasing. The water’s a touch warmer than usual at 17°, but that’s the only silver lining.
The first real chance for a wave comes on Friday 24th July. The morning shows a tiny 1ft swell from the WNW, but it’s a short 4-second period with a cross-shore wind. The combined energy is a weak (5), so it’s a grind. The afternoon brings onshore wind, so no joy there.
Saturday 25th July is your best bet. The morning offers the biggest swell of the outlook: 3ft from the NW, with a 5-second period. The combined energy is a moderate (42). The wind is a cross-offshore from the WNW, which will keep the surface clean. For a beginner-friendly spot like Trearddur Bay, this is the highlight. It’s inconsistent, and the period is short, so the waves will be soft and a bit weak. But it’s the best you’re gonna get.
After that, it’s back to small, onshore, and choppy conditions. The wind picks up strong on the 29th and 30th, making it lumpy and messy. Not worth the effort.
The standout? Saturday 25th July morning. It’s the biggest swell, cleanest wind, and the only window worth paddling out. If you’re itching for a session, that’s your moment.
Rusty.
Short Range ForecastMostly dry. Warm (max 22°C on Thu afternoon, min 12°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 17°C on Sun afternoon, min 12°C on Tue night). Mainly fresh winds. | |||||||||||||||||||
Thu 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | ||||||||||||||
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 14 | SSW 7 | SSW 6 | SSW 6 | SW 12 | S 11 | SW 11 | S 11 | S 11 | S 10 | N 5 | NNW 5 | NNW 5 | NNW 5 | N 5 | N 4 | N 4 | N 6 | N 6 | N 6 |
Wave Graph  | ||||||||||||||||||||
 kJ | 8 | 8 | 4 | 6 | 6 | 2 | 5 | 2 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
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 | cross-off | off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 00:52AM5.87m | 1:23PM5.44m | 1:37AM5.79m | 2:08PM5.28m | 2:22AM5.60m | 2:52PM5.06m | 3:07AM5.33m | 3:38PM4.82m | 3:53AM5.01m | 4:26PM4.58m | 4:45AM4.69m | 5:23PM4.40m | ||||||||
Low Tide | 6:34PM0.77m | 7:08AM0.38m | 7:20PM0.84m | 7:55AM0.51m | 8:05PM1.00m | 8:41AM0.77m | 8:50PM1.23m | 9:27AM1.09m | 9:37PM1.52m | 10:16AM1.45m | 10:29PM1.82m | 11:11AM1.78m | 11:31PM2.09m | |||||||
 |  |  | |  | | | | | | | | | | |  | | | | | |
 | — | — | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — | 5:15 | — | — | 5:16 | — | — | 5:18 | — | — |
 | — | 9:37 | — | — | 9:36 | — | — | 9:35 | — | — | 9:34 | — | — | 9:32 | — | — | 9:30 | — | — | 9:30 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 20 | 19 | 19 | 19 | 13 | 17 | 18 | 16 | 17 | 16 | 14 | 16 | 16 | 15 | 16 | 15 | 13 | 15 | 15 |
Feels °C | 19 | 17 | 14 | 15 | 16 | 10 | 14 | 15 | 14 | 13 | 12 | 11 | 12 | 13 | 12 | 14 | 13 | 8 | 10 | 10 |
Swell 1 Height (m) Direction Period (s) | SW 6 | SSW 7 | SSW 6 | SSW 6 | SW 6 | SW 6 | SW 6 | N 5 | S 11 | S 10 | — | — | — | — | N 5 | — | N 4 | — | — | — |
| kJ | 1 | 5 | 4 | 4 | 1 | 1 | 1 | 15 | 2 | 2 | — | — | — | — | 11 | — | 6 | — | — | — |
Swell 2 Height (m) Direction Period (s) | SW 14 | SW 12 | S 12 | SW 12 | SW 12 | S 11 | SW 11 | S 11 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 8 | 6 | 3 | 6 | 6 | 2 | 5 | 2 | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | SW 7 | SW 14 | — | — | — | — | — | S 5 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 2 | 8 | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NNE 3 | NNE 3 | N 4 | N 4 | N 4 | NNW 6 | NNW 6 | — | NNW 4 | N 4 | N 5 | NNW 5 | NNW 5 | NNW 5 | — | N 4 | — | N 6 | N 6 | N 6 |
| kJ | 1 | 1 | 7 | 10 | 17 | 83 | 104 | — | 5 | 2 | 25 | 43 | 24 | 24 | — | 8 | — | 66 | 66 | 96 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 208 | 326 | 326 | 1868 | 317 | 328 | 284 | 278 | 284 | 284 | 280 | 284 | 284 | 241 | 283 | 284 | 273 | 418 | 575 | 284 |
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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