
Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 30 Jul 2026:
- Most powerful swell: Thursday 30 Jul, 4AM (local time) - 2ft (0.6m), 5s period, SSW swell with 15 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 0.6m 5s and forecast to arrive on Thursday (Jul 30) at 4AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 4s period and expected on Wednesday (Aug 05) at 7AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4AM (Thu 30th Jul) | 2ft (0.6m) 5s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright, Rusty here, taking a long hard look at the whole picture for Trearddur Bay (Holy Island).
To be straight with you, it's a tough stretch ahead. The combined wave energy is flat-out weak, barely scraping into double digits at the best of times, so we're looking at a classic summer lull. The forecast is basically a long run of poor surf conditions right across the board, with no real standout sessions to get excited about.
We start off on Wednesday the 29th with a sloppy, lumpy mess. That 3 ft swell from the SSW has a terrible 4-second period, meaning it's just wind chop, and with a strong 30 km/h cross-on wind, it's not worth paddling out. The water is a touch warmer than average for the time of year, but that's the only pleasant note.
The next morning, Thursday the 30th, the swell drops to 2 ft, still with a short period, and the wind goes cross-shore. By the afternoon the wind goes glassy, but the swell drops to a tiny 1 ft. That afternoon might look nice and smooth on the surface, but there's simply no push in the water to surf on.
Friday the 31st through the end of the first week is more of the same: onshore winds and tiny swells under 2 ft. Even when we get a clean offshore breeze on the 2nd of August and the 3rd, the swell is a non-existent 0.3 ft, so you'll be sitting on a flat, glassy pond.
We hit the second week, and the pattern remains stubbornly flat. There are pockets of clean conditions, like the morning of August 7th with a light offshore breeze, but with waves still at 0.3 ft and a long period (12 seconds) that would suit a reef or point anyway, there's just nothing to ride here. The afternoon of August 8th goes dead flat and glassy with another 0.7 ft of nothing.
Even heading further out, the 9th of August brings a slight bump in energy, with a 1 ft SSW swell and an 8-second period, but the cross-shore wind won't help it shape up.
Honestly, looking at the full 16-day window, there are zero recommendations. For a spot that's fairly exposed, this kind of dry spell is part and parcel of summer. It’s a waiting game until something bigger pushes in from the SW. For now, the best bet is a longboard and a whole lot of patience – or just wait for the forecasts to change, because they usually do.
- Rusty
Short Range ForecastMostly dry. Very mild (max 18°C on Wed afternoon, min 13°C on Thu night). Winds decreasing (fresh winds from the SSW on Wed afternoon, calm by Thu afternoon). | Days 5-7 Weather SummaryLight rain (total 5mm), mostly falling on Tue morning. Warm (max 21°C on Mon morning, min 14°C on Tue morning). Winds increasing (calm on Sun morning, strong winds from the ENE by Mon night). | |||||||||||||||||||
Wed 29 | Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | ||||||||||||||
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) | SSW 4 | SW 5 | WNW 4 | WNW 4 | WSW 3 | W 4 | NW 3 | SSW 4 | SW 5 | SSW 5 | SW 4 | SSW 4 | W 8 | SW 10 | SW 9 | SW 9 | WSW 8 | SW 8 | SW 8 | SSW 7 |
Wave Graph | ||||||||||||||||||||
37 | 27 | 12 | 5 | 2 | 10 | 3 | 12 | 6 | 2 | 5 | 3 | 1 | 4 | 3 | 3 | 6 | 10 | 9 | 5 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | glassy | on | cross-on | on | cross-on | cross-on | cross-on | cross-on | glassy | off | off | cross-off | off | off | cross-off | cross-off | off |
High Tide | 11:31PM5.40m | 11:54AM5.05m | 00:03AM5.49m | 12:26PM5.10m | 00:36AM5.52m | 12:58PM5.13m | 1:09AM5.52m | 1:32PM5.12m | 1:43AM5.48m | 2:07PM5.09m | 2:20AM5.40m | 2:46PM5.01m | 3:02AM5.25m | |||||||
Low Tide | 5:17PM1.36m | 5:41AM1.11m | 5:50PM1.23m | 6:14AM0.99m | 6:23PM1.15m | 6:46AM0.92m | 6:56PM1.12m | 7:20AM0.89m | 7:31PM1.14m | 7:56AM0.93m | 8:09PM1.21m | 8:35AM1.03m | 8:51PM1.35m | |||||||
— | — | 5:30 | — | — | 5:31 | — | — | 5:33 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — | |
— | 9:19 | — | — | 9:17 | — | — | 9:15 | — | — | 9:14 | — | — | 9:12 | — | — | 9:10 | — | — | 9:08 | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 4 | — | — |
Temp °C | 18 | 16 | 14 | 16 | 15 | 14 | 16 | 17 | 13 | 15 | 15 | 17 | 18 | 16 | 21 | 20 | 19 | 15 | 15 | 14 |
Feels °C | 14 | 16 | 10 | 13 | 13 | 10 | 12 | 13 | 9 | 12 | 12 | 15 | 15 | 12 | 17 | 14 | 12 | 13 | 14 | 10 |
Swell 1 Height (m) Direction Period (s) | — | SW 5 | SW 5 | WNW 4 | SW 4 | — | NW 3 | SSW 4 | SW 5 | WNW 3 | — | NNW 3 | — | SW 8 | NNW 4 | NNW 4 | WSW 8 | SW 8 | SW 8 | SSW 7 |
— | 27 | 5 | 5 | 1 | — | 3 | 12 | 6 | 2 | — | 2 | — | 3 | 3 | 3 | 6 | 10 | 9 | 5 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | SSW 5 | — | — | — | — | — | W 9 | W 9 | SSW 4 | W 8 | SW 10 | SW 9 | SW 9 | — | — | — | — |
— | — | — | 2 | — | — | — | — | — | 2 | 2 | 1 | 1 | 4 | 3 | 3 | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | SW 8 | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | 3 | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | SSW 4 | — | WNW 4 | — | WSW 3 | W 4 | SW 3 | WNW 2 | WNW 3 | SSW 5 | SW 4 | — | N 3 | NNE 3 | — | — | — | — | NNW 3 | — |
37 | — | 12 | — | 2 | 10 | 1 | 1 | 4 | 2 | 5 | — | 3 | 3 | — | — | — | — | 1 | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 246 | 51 | 548 | 292 | 246 | 292 | 586 | 55 | 368 | 368 | 246 | 251 | 287 | 163 | 179 | 195 | 286 | 326 | 326 | 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.










