Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 3 Jul 2026:
- Most powerful swell: Friday 3 Jul, 10PM (local time) - 4ft (1.2m), 6s period, SW swell with 88 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 1.2m 6s and forecast to arrive on Friday (Jul 03) at 10PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 4s period and expected on Friday (Jul 03) at 4AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Fri 3rd Jul) | 4ft (1.2m) 6s |
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 see what Trearddur Bay (Holy Island) has in store for us. Honestly, it's a proper quiet period. We've got a long stretch of tiny, flat conditions ahead, so don't get your hopes up for anything firing for a good while.
It starts this Thursday afternoon, 2nd July, with a small 2ft swell from the SW, but it's blown out. A cross-shore wind of 15 mph has it messy and choppy, with the energy reading barely a blip. From Friday right through to the middle of next week, it's all small, weak dribble with onshore winds keeping things lumpy. The water's about 60°, which is a touch warmer than usual, but there's no waves to enjoy it in.
There's a little glimmer right at the end, a long way off. On Thursday 16th July, there's a hint of a wave, but it's still only ankle-high with an onshore breeze. The only time I'd really bother is Friday 17th July. We get a 2ft to 3ft groundswell from the WNW, but it's a short period, so not much power. The best part is the wind: glassy in the morning then clean offshore in the afternoon. The energy is still weak, so it's a longboard session at best, but it's the only chance of a clean wave in the whole outlook.
Other than that, it's flat. Several days with offshore and glassy winds, like the 12th and 13th, but with zero swell, it's a total dry spell. For a spot that usually gets some exposure, this is a real quiet patch. Not much else to say.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Sat afternoon, min 14°C on Thu night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 21°C on Mon afternoon, min 17°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Thu 2 | Friday 3 | Saturday 4 | Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | |||||||||||||||
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) | SW 7 | SW 6 | SW 5 | SSW 4 | SW 6 | SW 5 | SW 5 | SW 5 | SW 4 | SW 4 | SSW 4 | SW 5 | SW 3 | SW 4 | WNW 4 | NW 3 | S 12 | — | — | — | S 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 38 | 9 | 4 | 16 | 59 | 63 | 45 | 28 | 9 | 5 | 6 | 5 | 4 | 4 | 5 | 2 | 3 | 0 | 0 | 0 | 3 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross-on | cross-on | on | on | on | on | on | on | cross-on | cross-on | on | on | on | on | on | cross-off | cross-off | off | off |
High Tide | 00:58AM5.33m | 1:23PM4.89m | 1:34AM5.29m | 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 | ||||||||
Low Tide | 6:45PM1.37m | 7:11AM1.16m | 7:20PM1.40m | 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 | |||||||
 |  | | | | | | | |  |  | | | | | | | | | | | |
 | — | — | 4:56 | — | — | 4:56 | — | — | 4:58 | — | — | 4:58 | — | — | 5:00 | — | — | 5:00 | — | — | 5:01 |
 | — | 9:47 | — | — | 9:47 | — | — | 9:46 | — | — | 9:46 | — | — | 9:45 | — | — | 9:45 | — | — | 9:45 | 9:44 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 16 | 16 | 15 | 17 | 18 | 20 | 21 | 19 | 18 | 19 | 19 | 19 | 21 | 20 | 19 | 21 | 21 | 20 | 21 | 20 | 22 |
Feels °C | 12 | 13 | 11 | 12 | 15 | 16 | 17 | 16 | 16 | 17 | 17 | 16 | 19 | 18 | 17 | 19 | 20 | 18 | 18 | 17 | 21 |
Swell 1 Height (m) Direction Period (s) | SW 7 | SW 6 | SW 5 | — | — | NW 4 | — | SW 5 | NW 4 | NW 4 | SSW 4 | NW 4 | WNW 3 | SW 4 | SSW 4 | NW 3 | S 12 | — | — | — | — |
| kJ | 36 | 9 | 4 | — | — | 2 | — | 28 | 4 | 2 | 6 | 4 | 1 | 4 | 2 | 2 | 3 | — | — | — | — |
Swell 2 Height (m) Direction Period (s) | SW 7 | — | NNW 4 | — | — | — | — | — | — | SW 5 | — | — | — | — | SW 4 | — | — | — | — | — | S 11 |
| kJ | 38 | — | 1 | — | — | — | — | — | — | 1 | — | — | — | — | 3 | — | — | — | — | — | 3 |
Swell 3 Height (m) Direction Period (s) | — | SW 11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 5 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NW 5 | NW 4 | W 3 | SSW 4 | SW 6 | SW 5 | SW 5 | WNW 4 | SW 4 | SW 4 | WNW 3 | SW 5 | SW 3 | — | WNW 4 | SSW 4 | WSW 3 | — | — | — | — |
| kJ | 28 | 7 | 1 | 16 | 59 | 63 | 45 | 16 | 9 | 5 | 1 | 5 | 4 | — | 5 | 2 | 1 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 51 | 179 | 179 | 246 | 251 | 305 | 407 | 192 | 251 | 305 | 275 | 292 | 323 | 251 | 292 | 358 | 246 | 241 | 277 | 241 | 246 |
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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