Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 15 Jul 2026:
- Most powerful swell: Thursday 16 Jul, 1PM (local time) - 0.5ft (0.1m), 14s 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 14s and forecast to arrive on Thursday (Jul 16) 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 6s period and expected on Saturday (Jul 18) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Thu 16th Jul) | 0.5ft (0.1m) 14s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's on offer for Trearddur Bay.
Right off the bat, I gotta be straight with you – the next week and a half is a write-off. We're looking at a solid gap from now until the morning of the 27th of July where there's just nothing worth paddling out for. Swell heights are stuck at 0.3ft or 0.7ft, and the combined energy is pathetic, often in single digits. The surf is just plain poor. You’d be better off waxing your board and staring at the ceiling.
Things start to show a tiny pulse of life on the 27th of July. The swell bumps up to 3ft from the SSW, but it's a short-period windswell of only 5 seconds, and the wind is a fresh cross-onshore at 19 mph. The combined energy finally hits a moderate 33, but it's going to be a lumpy, messy affair. The following days on the 28th and 29th hold a little more consistent energy, with the 29th of July seeing the best of the weak run. Swell hits 4ft from the W with a combined energy of 80, which is moderate. But again, the period is a short 5 seconds, and the wind is a light cross-onshore. It's not going to be pretty, but it’s the most size you’ll see. The water temp is a touch warmer than normal at 62°.
This is a spot that's "inconsistent" and geared towards beginners, so a blank run like this isn't entirely unusual. There's no standout session here, not even close. Honestly, with the onshore winds and short-period chop, the setup on the 27th looks more interesting for a kite surfer than a paddle surfer.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Wed night, min 13°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 18°C on Sat night, min 13°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Wed 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | |||||||||||||||
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 16 | S 16 | SW 6 | SW 14 | SSW 7 | SSW 6 | SSW 6 | SW 12 | S 11 | SW 11 | SW 11 | S 11 | S 10 | S 10 | N 5 | NNW 5 | N 6 | NNW 5 | N 5 | NNW 4 | N 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 10 | 7 | 1 | 8 | 8 | 4 | 6 | 6 | 2 | 5 | 5 | 2 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | off | cross-off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 00:06AM5.82m | 12:36PM5.53m | 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 | ||||||||
Low Tide | 5:47PM0.80m | 6:20AM0.38m | 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 | |||||||
 |  |  | | | | |  | | | | | | | | | | | | | | |
 | — | — | 5:09 | — | — | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — | 5:15 | — | — | 5:16 | — | — | 5:18 |
 | — | 9:38 | — | — | 9:37 | — | — | 9:36 | — | — | 9:35 | — | — | 9:34 | — | — | 9:32 | — | — | 9:30 | 9:30 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 23 | 21 | 22 | 20 | 19 | 19 | 19 | 14 | 16 | 18 | 17 | 17 | 16 | 13 | 17 | 16 | 18 | 20 | 18 | 19 |
Feels °C | 20 | 20 | 19 | 19 | 17 | 16 | 15 | 16 | 9 | 11 | 15 | 14 | 13 | 13 | 9 | 14 | 13 | 15 | 18 | 16 | 17 |
Swell 1 Height (m) Direction Period (s) | SW 6 | SSW 6 | — | SW 6 | SSW 7 | SSW 6 | SSW 6 | SW 6 | SW 6 | SW 6 | SW 11 | N 5 | NNW 4 | S 10 | — | — | — | — | — | — | — |
| kJ | 2 | 4 | — | 1 | 5 | 4 | 4 | 1 | 1 | 1 | 5 | 12 | 2 | 2 | — | — | — | — | — | — | — |
Swell 2 Height (m) Direction Period (s) | SW 16 | SW 13 | SW 6 | SW 14 | SW 12 | S 12 | SW 12 | SW 12 | S 11 | SW 11 | S 5 | S 11 | — | — | — | — | — | — | — | — | — |
| kJ | 10 | 7 | 1 | 8 | 6 | 3 | 6 | 6 | 2 | 5 | 1 | 2 | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | S 13 | S 16 | — | SW 7 | SW 14 | — | — | — | — | — | — | — | S 10 | — | — | — | — | — | — | — | — |
| kJ | 3 | 5 | — | 2 | 8 | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NE 4 | NE 3 | — | NNE 3 | NNE 3 | N 4 | N 4 | N 4 | N 5 | N 6 | N 6 | — | — | N 3 | N 5 | NNW 5 | N 6 | NNW 5 | N 5 | NNW 4 | N 4 |
| kJ | 4 | 3 | — | 4 | 3 | 7 | 6 | 7 | 21 | 62 | 85 | — | — | 3 | 32 | 35 | 77 | 37 | 11 | 6 | 10 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 184 | 219 | 208 | 208 | 316 | 326 | 1377 | 285 | 284 | 284 | 264 | 284 | 284 | 280 | 284 | 382 | 270 | 301 | 323 | 273 | 283 |
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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