Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 3 Jul 2026:
- Most powerful swell: Friday 3 Jul, 10PM (local time) - 3.5ft (1.1m), 5s period, SW swell with 60 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 1.1m 5s and forecast to arrive on Friday (Jul 03) at 10PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 2s period and expected on Thursday (Jul 09) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10PM (Fri 3rd Jul) | 3.5ft (1.1m) 5s |
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 get into it. Rusty here.
Right off the bat, I gotta tell ya—this stretch around Trearddur Bay on Holy Island is looking pretty grim for a long while. We’re talking a solid two-week stretch of flat to tiny, messy, or just plain unsurfable conditions. The first two and a half weeks of this forecast are a big fat blank.
It’s not until Saturday the 18th of July that we finally see something happen. Up until then, from Friday the 3rd through to Friday the 17th, you’re looking at nothing but poor surf conditions. A lot of onshore or cross-onshore wind, choppy, lumpy, or just flat calm with zero swell. There are a couple of days with clean offshore winds and glassy conditions, but there’s simply no wave energy to work with (energy values sitting at 0 or just single-digit numbers). That’s a long gap of nothing.
Now, the one bright spot is that Saturday the 18th of July. Trearddur Bay itself finally wakes up. On Saturday morning, we’ve got a 6ft swell rolling in from the SSW with a period of 7 seconds. That’s a moderate amount of energy (324), and we’re seeing light offshore breezes from the NE. That means clean conditions! The water temperature is about 60°F, which is a touch warmer than normal for the time of year, so it’ll be pleasant enough. This is the standout for the whole outlook.
However, by Saturday afternoon the same spot goes a bit lumpy with cross-shore wind, and the swell bumps up to 7ft. That’s getting into expert-only territory, especially if it’s a bit walled-up. It’s a short period swell, so it won’t have the same punch as a groundswell, but it’s still a proper wave. Keep in mind, at that size, beginners might find it too much.
So, if you’re hanging on for a wave, your only real play in this 16-day window is the morning of Saturday the 18th. Light wind, clean, chest to head-high waves. It’s a long wait, but it’s something. For the rest of it, honestly, the kites might have more fun than the paddle crew.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Sat afternoon, min 14°C on Fri morning). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 21°C on Mon afternoon, min 15°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Friday 3 | Saturday 4 | Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | |||||||||||||||
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) | SW 5 | SSW 4 | SW 5 | SW 5 | SW 5 | SW 5 | SW 6 | SW 3 | SW 4 | SW 4 | SW 3 | WSW 4 | W 4 | NW 4 | WNW 3 | — | NNW 3 | — | S 11 | — | NNE 3 |
Wave Graph  | |||||||||||||||||||||
 kJ | 7 | 11 | 51 | 41 | 38 | 28 | 11 | 4 | 14 | 9 | 5 | 8 | 9 | 4 | 1 | 0 | 0 | 0 | 3 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | on | on | cross-on | on | cross-on | on | on | on | cross-on | on | on | glassy | cross | cross-on | off | cross-off | glassy | cross-off |
High Tide | 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 | 6:12PM4.58m | ||||||||
Low Tide | 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 | 00:24AM1.81m | ||||||||
 | |  | | | | |  |  |  | | | | | | | | | | | | |
 | 4:56 | — | — | 4:56 | — | — | 4:58 | — | — | 4:58 | — | — | 5:00 | — | — | 5:00 | — | — | 5:01 | — | — |
 | — | — | 9:47 | — | — | 9:46 | — | — | 9:46 | — | — | 9:45 | — | — | 9:45 | — | — | 9:45 | — | — | 9:44 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 16 | 18 | 19 | 21 | 19 | 17 | 20 | 19 | 18 | 21 | 20 | 18 | 19 | 18 | 18 | 20 | 20 | 21 | 22 | 22 |
Feels °C | 10 | 10 | 16 | 15 | 18 | 17 | 15 | 17 | 17 | 15 | 19 | 18 | 16 | 19 | 18 | 17 | 20 | 20 | 22 | 23 | 21 |
Swell 1 Height (m) Direction Period (s) | SW 5 | — | — | NW 4 | — | SW 5 | NW 4 | WNW 3 | — | NW 4 | WNW 4 | — | NW 4 | NW 4 | WNW 3 | — | — | — | S 11 | — | NNE 3 |
| kJ | 7 | — | — | 5 | — | 28 | 3 | 1 | — | 4 | 1 | — | 5 | 4 | 1 | — | — | — | 3 | — | 1 |
Swell 2 Height (m) Direction Period (s) | N 4 | — | — | — | — | — | NW 4 | — | — | — | — | — | SW 4 | — | — | — | — | — | — | — | — |
| kJ | 1 | — | — | — | — | — | 3 | — | — | — | — | — | 3 | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | SSW 4 | SW 5 | SW 5 | SW 5 | WNW 4 | SW 6 | SW 3 | SW 4 | SW 4 | SW 3 | WSW 4 | W 4 | SW 3 | — | — | NNW 3 | — | — | — | ENE 2 |
| kJ | — | 11 | 51 | 41 | 38 | 11 | 11 | 4 | 14 | 9 | 5 | 8 | 9 | 1 | — | — | 1 | — | — | — | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 251 | 249 | 251 | 192 | 792 | 51 | 195 | 305 | 292 | 251 | 347 | 347 | 358 | 390 | 184 | 270 | 292 | 246 | 249 | 249 | 249 |
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