Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 13 Jul 2026:
- Most powerful swell: Tuesday 14 Jul, 1PM (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 1PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 6s period and expected on Sunday (Jul 19) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Tue 14th Jul) | 0.5ft (0.1m) 18s |
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 cookin’ for Trearddur Bay on Holy Island.
Honestly, I gotta be straight with you – the next 16 days are lookin’ pretty flat and grim for a paddle. We’ve got a long stretch of hardly any surf on offer. The first real chance of anything rideable doesn’t show up until the 24th of July, and even then, it’s a struggle. From the 13th right through to the 23rd, we’re looking at a massive gap with wave heights barely a whisper – mostly 0.3 ft to 0.7 ft, and a lot of days with zero swell energy at all. You’d be better off taking up gardening for that first week and a half.
We do see a tiny pulse of hope on the 24th of July. Friday morning brings a bit of a bump from the SSW around 2 ft, but it’s a short period swell at only 4 seconds, and it’s coming straight onshore. That’s gonna be a messy, choppy affair. The afternoon picks up a little to 3 ft from the SSW, but again, that 4-second period is just windslop, and a 16 mph cross-onshore breeze will make it lumpy. The combined energy is still weak (32), so don’t expect much push.
The 25th of July (Saturday) might be the best of a bad bunch, but that’s not sayin’ much. Morning sees 3 ft from the SSW, with a period of 7 seconds – still a short-period swell. The wind is onshore at 16 mph, so it’s not clean. The combined energy climbs to 62, which is still weak. This is more of a kite-surfing setup than a proper surfing day, given the onshore wind and messy conditions.
Through the 26th to the 28th, we’ve got small, short-period swells again (1 ft to 2 ft), but the wind gets nasty. We’re talking strong to near-gale force cross-onshore winds, making it completely blown out. The water temp is sitting at 61°, which is a touch warmer than average for this time of year, but you won’t be feeling it much when you’re not catching waves.
Right now, there’s nothing to get excited about. If you’re desperate, the 24th and 25th of July offer the most energy, but it’s not a surfer’s swell. The break is inconsistent and best for beginners, so this quiet spell isn’t too unusual for the area. Keep your eye on the forecasts – things can change.
Rusty.
Short Range ForecastMostly dry. Warm (max 24°C on Wed night, min 15°C on Mon night). Winds decreasing (fresh winds from the ENE on Mon night, light winds from the E by Wed night). | Days 5-7 Weather SummaryMostly dry. Warm (max 23°C on Thu afternoon, min 13°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Mon 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | |||||||||||||||
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) | S 19 | S 15 | S 18 | SW 18 | SW 14 | SW 16 | SW 16 | SW 13 | SSW 6 | SW 14 | S 12 | SSW 7 | SSW 7 | SW 12 | S 11 | S 11 | S 11 | S 11 | S 10 | S 10 | — |
Wave Graph  | |||||||||||||||||||||
 kJ | 7 | 4 | 6 | 12 | 7 | 10 | 10 | 7 | 4 | 8 | 3 | 5 | 6 | 6 | 2 | 2 | 2 | 2 | 2 | 2 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | off | cross-off | off | off | off | off | cross-off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 10:28PM5.42m | 10:57AM5.41m | 11:18PM5.67m | 11:48AM5.52m | 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 | ||||||||
Low Tide | 4:08PM1.09m | 4:40AM0.77m | 4:59PM0.91m | 5:31AM0.52m | 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 | |||||||
 |  | | | | | | | |  | | | |  | | | | |  | | | |
 | — | — | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — | 5:15 |
 | — | 9:40 | — | — | 9:39 | — | — | 9:38 | — | — | 9:37 | — | — | 9:36 | — | — | 9:35 | — | — | 9:34 | 9:32 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 19 | 19 | 21 | 22 | 22 | 23 | 24 | 23 | 23 | 20 | 21 | 22 | 20 | 14 | 18 | 16 | 16 | 17 | 17 | 17 |
Feels °C | 13 | 13 | 14 | 16 | 17 | 19 | 19 | 20 | 19 | 18 | 16 | 18 | 19 | 17 | 11 | 13 | 11 | 12 | 12 | 15 | 15 |
Swell 1 Height (m) Direction Period (s) | S 19 | S 15 | S 18 | SW 18 | S 7 | S 6 | SW 6 | N 4 | NE 4 | SW 6 | SW 6 | SSW 7 | SSW 7 | SW 6 | SW 6 | SW 6 | S 11 | N 5 | NNW 4 | — | — |
| kJ | 7 | 4 | 6 | 12 | 1 | 1 | 2 | 3 | 1 | 1 | 1 | 5 | 4 | 2 | 1 | 1 | 2 | 11 | 3 | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | SW 14 | SW 16 | SW 16 | SSW 6 | SSW 6 | SW 14 | SW 8 | NNW 4 | SW 12 | SW 12 | S 11 | S 11 | S 5 | S 11 | S 10 | S 10 | — |
| kJ | — | — | — | — | 7 | 10 | 10 | 4 | 4 | 8 | 2 | 1 | 6 | 6 | 2 | 2 | 1 | 2 | 2 | 2 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | S 13 | S 13 | SW 13 | — | — | S 12 | S 12 | — | — | — | — | S 5 | S 5 | — | — | — |
| kJ | — | — | — | — | — | 3 | 3 | 7 | — | — | 3 | 3 | — | — | — | — | 1 | 1 | — | — | — |
Wind waves Height (m) Direction Period (s) | NNE 4 | NE 4 | NE 4 | NNE 4 | NE 4 | NE 4 | NE 4 | E 3 | — | NE 3 | NNE 3 | NE 3 | NNE 3 | N 3 | N 4 | N 4 | N 6 | — | — | — | — |
| kJ | 31 | 20 | 10 | 13 | 18 | 7 | 14 | 5 | — | 4 | 5 | 2 | 4 | 2 | 5 | 5 | 49 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 344 | 285 | 184 | 208 | 288 | 303 | 364 | 326 | 326 | 350 | 267 | 306 | 575 | 286 | 332 | 284 | 273 | 284 | 332 | 273 | 299 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Trearddur Bay (Holy Island) surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest