Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 4 Jul 2026:
- Most powerful swell: Saturday 4 Jul, 4PM (local time) - 3.5ft (1.0m), 5s period, SW swell with 41 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 1.0m 5s and forecast to arrive on Saturday (Jul 04) at 4PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Saturday (Jul 11) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Sat 4th Jul) | 3.5ft (1.0m) 5s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
Updates in hr min s Forecast update imminent
Imperial
Alright folks, Rusty here. Gotta be straight with you – this is a tough one. Looking at Trearddur Bay (Holy Island), the water is sitting at about 60°, which is a couple of degrees warmer than usual for this time of year, so it’s a touch on the mild side.
The problem is, we’ve got a real dry spell on our hands. From the start of the forecast period, Saturday the 4th of July, right through to the end, the surf just isn’t showing up. The swell energy is weak, with the combined energy reading as low as 52 on Saturday morning, and it just drops off a cliff after that. Saturday sees a 4ft swell from the SW, but with a short 5-second period and a 19 mph onshore wind, it's a choppy, messy mess.
We’re looking at a solid 15-day stretch where every single wave comment reads "poor surf conditions." That’s a long, quiet run, and for this area, that’s pretty normal when the weather patterns lock in. There’s a tiny flicker on the 9th of July, a 0.3ft swell from the south with an 11-second period and a light offshore NNE breeze – that’s clean, but there’s just no size to work with.
Even the bigger, longer-period pulses later on, like the 1.0ft, 18-second swell on the 14th of July, are backed by hardly any energy (12) and only produce knee-high dribble. The wind does turn offshore on several days after the 13th, which would be a dream, but without any swell to push, it’s a flat, glassy lake.
Honestly, if you’re desperate for a paddle, the cleanest conditions will be the offshore days from the 14th of July onward, but you’ll be floating more than surfing. For kite surfers, the onshore breezes and the small, choppy waves in the first few days might offer a bit of fun, but for paddle surfing, it's a waiting game.
There are no standout sessions here. Save your energy.
Rusty.
Short Range ForecastMostly dry. Warm (max 20°C on Sat afternoon, min 15°C on Sun night). Winds decreasing (fresh winds from the SW on Sat morning, light winds from the WSW by Sun night). | Days 4-6 Weather SummaryMostly dry. Warm (max 24°C on Thu afternoon, min 16°C on Tue morning). Wind will be generally light. | ||||||||||||||||||||
Saturday 4 | Sunday 5 | Monday 6 | Tuesday 7 | Wednesday 8 | Thursday 9 | Friday 10 | |||||||||||||||
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 | SW 5 | WSW 4 | SW 4 | SW 4 | SW 4 | NW 4 | SSW 3 | SW 4 | NW 4 | NW 4 | SW 4 | SSW 4 | — | — | S 11 | — | — | S 10 | — | N 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 47 | 41 | 29 | 15 | 18 | 9 | 5 | 3 | 16 | 9 | 2 | 4 | 1 | 0 | 0 | 3 | 0 | 0 | 2 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | on | on | cross-on | on | cross-on | on | on | cross-on | cross-on | cross-on | on | cross-off | off | cross-off | off | cross | cross-off | cross-off |
High Tide | 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 | 6:36AM4.79m | 7:23PM4.67m | ||||||||
Low Tide | 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 | 1:00PM1.53m | 1:36AM1.68m | ||||||||
 | |  |  | |  | | | |  | | | | | | | | | | | | |
 | 4:56 | — | — | 4:58 | — | — | 4:58 | — | — | 5:00 | — | — | 5:00 | — | — | 5:01 | — | — | 5:03 | — | — |
 | — | — | 9:46 | — | — | 9:46 | — | — | 9:45 | — | — | 9:45 | — | — | 9:45 | — | — | 9:44 | — | — | 9:43 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 20 | 19 | 17 | 19 | 19 | 16 | 18 | 18 | 18 | 20 | 19 | 19 | 21 | 21 | 23 | 24 | 22 | 18 | 18 | 15 |
Feels °C | 15 | 17 | 17 | 14 | 16 | 18 | 14 | 15 | 17 | 15 | 17 | 17 | 19 | 20 | 21 | 22 | 23 | 20 | 17 | 15 | 10 |
Swell 1 Height (m) Direction Period (s) | NW 4 | — | — | — | NW 4 | SW 4 | NW 4 | WNW 3 | SW 4 | NW 4 | NW 4 | SW 4 | SSW 4 | — | — | S 11 | — | — | S 10 | — | — |
| kJ | 5 | — | — | — | 1 | 9 | 3 | 1 | 16 | 9 | 2 | 4 | 1 | — | — | 3 | — | — | 2 | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | NW 4 | NW 4 | — | — | SW 4 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | 1 | 2 | — | — | 4 | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | S 12 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 3 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 5 | SW 5 | WSW 4 | SW 4 | SW 4 | WNW 4 | SW 4 | SSW 3 | WNW 3 | — | SW 2 | — | — | — | — | — | — | — | — | — | N 4 |
| kJ | 47 | 41 | 29 | 15 | 18 | 6 | 5 | 3 | 1 | — | 2 | — | — | — | — | — | — | — | — | — | 13 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 548 | 407 | 192 | 192 | 305 | 292 | 251 | 323 | 251 | 251 | 356 | 235 | 246 | 246 | 249 | 249 | 249 | 249 | 292 | 318 | 317 |
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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