Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 8 Jul 2026:
- Most powerful swell: Tuesday 14 Jul, 10AM (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 10AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 6s 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 | 10AM (Tue 14th Jul) | 0.5ft (0.1m) 18s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
Alright folks, Rusty here. Let's have a look at what Trearddur Bay (Holy Island) has lined up for us over the next couple of weeks. I've gotta be straight with you – this is a tough one to write.
Right now, and for the foreseeable future, we are in a flat spell. There is simply no swell reaching the bay. The combined wave energy is sitting at zero for days on end. From the start of the outlook, through Wednesday the 8th of July and all the way into the second week, it’s a complete write-off for surfing. There’s a long, dry gap here with nothing on offer.
The conditions are clean, sure. From Friday the 10th through to the 19th, we get a solid run of offshore winds from the NE and ENE, often a fresh breeze at 15 to 18 mph. The water temp is sitting around 59°, which is about normal for this time of year. But without any swell to work with, it’s just a pretty picture. Even the odd tiny pulse on the 13th and 14th – a 0.3 ft south swell with a very long 19-second period – only registers a combined energy of 7 and 18, which is so weak it’s borderline non-existent. That sort of long period groundswell can be tricky on a beach setup anyway, but here it’s just a whisper.
There’s no standout period here. Nothing is worth paddling out for. Trearddur Bay is inconsistent at the best of times, and this stretch confirms it. Even by the 22nd and 23rd of July, when we finally see a 0.7 ft and then a 3 ft pulse, the wind switches onshore and the combined energy maxes out at a pathetic 18. That’s not surf, that’s a messy lake. Honestly, with the strong onshore winds and small, poor-quality waves on the 23rd, the setup looks more interesting for kite surfing than paddle surfing right now.
This is a proper blank run, but for this area, it’s not unusual. Forecasts can change, but right now, leave the board in the van.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Fri morning, min 15°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Sat afternoon. Warm (max 21°C on Sat morning, min 13°C on Sun night). Mainly fresh winds. | ||||||||||||||||||||
Wednesday 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | |||||||||||||||
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) | — | — | SSW 2 | S 11 | WNW 3 | — | — | N 3 | N 5 | N 6 | N 5 | NNW 5 | NE 4 | NE 4 | NE 4 | NE 3 | S 19 | S 15 | S 18 | SW 18 | SW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 1 | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 4 | 12 | 12 | 7 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | cross | cross | off | off | cross-off | cross-off | off | cross-off | off | off | off | off | off | off | off | off | off | off |
High Tide | 5:07PM4.59m | 5:27AM4.83m | 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 | ||||||||
Low Tide | 10:50AM1.43m | 11:15PM1.80m | 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 | ||||||||
 | |  | |  | | | |  |  |  | | | | | | | | | | | |
 | 5:00 | — | — | 5:01 | — | — | 5:03 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 | — | — |
 | — | — | 9:45 | — | — | 9:44 | — | — | 9:43 | — | — | 9:43 | — | — | 9:42 | — | — | 9:40 | — | — | 9:39 |
mm | — | — | — | — | — | — | — | — | — | 1 | 3 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 20 | 19 | 17 | 19 | 19 | 21 | 21 | 19 | 21 | 19 | 19 | 19 | 19 | 18 | 15 | 18 | 19 | 18 | 21 | 20 |
Feels °C | 19 | 20 | 18 | 16 | 19 | 18 | 19 | 19 | 17 | 19 | 15 | 14 | 14 | 14 | 11 | 9 | 13 | 15 | 13 | 16 | 14 |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | SW 4 | — | — | — | — | N 6 | NW 5 | NNW 5 | — | — | — | — | S 19 | S 15 | S 18 | SW 18 | SW 14 |
| kJ | — | — | — | — | 1 | — | — | — | — | 77 | 7 | 20 | — | — | — | — | 7 | 4 | 6 | 12 | 7 |
Swell 2 Height (m) Direction Period (s) | — | — | — | S 11 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 14 |
| kJ | — | — | — | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 7 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | N 5 | — | — | N 5 | — | — | SW 18 | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | 1 | — | — | 12 | — | — |
Wind waves Height (m) Direction Period (s) | — | — | SSW 2 | WNW 3 | WNW 3 | — | — | N 3 | N 5 | — | N 5 | NE 5 | NE 4 | NE 4 | NE 4 | NE 3 | NNE 4 | NNE 4 | NE 4 | NNE 4 | NE 4 |
| kJ | — | — | 1 | 2 | 1 | — | — | 7 | 66 | — | 31 | 14 | 13 | 26 | 21 | 5 | 19 | 9 | 7 | 7 | 9 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 249 | 292 | 246 | 249 | 285 | 241 | 163 | 179 | 189 | 253 | 252 | 249 | 288 | 208 | 288 | 208 | 184 | 249 | 208 | 208 | 249 |
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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