Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 15 Jul 2026:
- Most powerful swell: Wednesday 15 Jul, 10AM (local time) - 0.5ft (0.1m), 16s period, SW swell with 10 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 16s and forecast to arrive on Wednesday (Jul 15) 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 18) at 10PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 10AM (Wed 15th Jul) | 0.5ft (0.1m) 16s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright, Rusty here, and I’m lookin’ at Trearddur Bay (Holy Island). Man, it’s a lean spell. The next 16 days are pretty much flat, with barely a ripple worth paddling for.
Water temp is about average for the season, so nothin’ to complain about there. But the waves? They’re just not there. We’ve got a whisper of a long-period groundswell from the SW early on, but it’s tiny – 0.3ft at best. The combined energy is weak, just a few points (14). It’s all show and no go. A long period like that needs a decent point or reef to focus it, but there’s no size to work with.
The first week is a total bust. From July 15th straight through to the 22nd, every session is written off as poor surf. There’s a big gap of several days with no real waves. The wind is mostly offshore or cross-offshore, which would be a dream for clean conditions, but with no swell, it’s just a flat, clean ocean.
We get a little change on July 23rd. Early morning there’s a glassy moment with a 0.3ft SW swell, period 14 seconds, and a tiny bit of energy (12). But it’s still just a bump. Then on the 24th, there’s a 1ft pulse from the WNW with a short period of 4 seconds, but it’s onshore wind. That’s gonna be a messy, blown-out mess, not surfable.
The second week, from July 25th onward, is a total blank. The winds turn onshore and cross-onshore, and the swell numbers drop to zero. Nothin’ at all.
No standouts here. No break is firing. This is the kind of flat spell that’s more normal for an inconsistent spot like this. It’s not worth the trip. The only thing that might get interesting is if you’re a kiter, because that 1ft windswell on the 24th with the onshore breeze could be a bit of fun for them, but for a surfer? It’s just a flat, sad story.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Wed afternoon, min 18°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 18°C on Fri night, min 13°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | |||||||||||||||
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 16 | SW 16 | S 16 | SW 14 | SW 14 | SSW 7 | SSW 6 | SSW 6 | SW 12 | S 11 | S 11 | S 11 | S 11 | NNW 3 | N 3 | N 5 | N 5 | NNW 6 | N 5 | NNW 4 | NNE 3 |
Wave Graph  | |||||||||||||||||||||
 kJ | 10 | 10 | 7 | 8 | 8 | 8 | 4 | 6 | 6 | 2 | 2 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | off | off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off |
High Tide | 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 | 3:38PM4.82m | 3:53AM5.01m | 4:26PM4.58m | ||||||||
Low Tide | 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 | 9:37PM1.52m | 10:16AM1.45m | 10:29PM1.82m | |||||||
 | |  |  | |  | | | | | | | | | | | | | | | | |
 | 5:07 | — | — | 5:09 | — | — | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — | 5:15 | — | — | 5:16 | — | — |
 | — | — | 9:38 | — | — | 9:37 | — | — | 9:36 | — | — | 9:35 | — | — | 9:34 | — | — | 9:32 | — | — | 9:30 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 23 | 23 | 22 | 22 | 20 | 21 | 20 | 18 | 15 | 16 | 18 | 17 | 17 | 16 | 14 | 16 | 17 | 18 | 19 | 18 |
Feels °C | 20 | 19 | 19 | 19 | 17 | 17 | 17 | 14 | 16 | 11 | 12 | 16 | 14 | 13 | 12 | 11 | 13 | 15 | 15 | 17 | 16 |
Swell 1 Height (m) Direction Period (s) | S 6 | SW 6 | SSW 6 | N 3 | SW 6 | SSW 7 | SSW 6 | SSW 6 | SW 6 | SW 6 | SW 6 | NNW 6 | NNW 4 | — | — | — | — | — | N 5 | — | — |
| kJ | 1 | 2 | 4 | 1 | 1 | 5 | 4 | 4 | 1 | 1 | 1 | 56 | 3 | — | — | — | — | — | 12 | — | — |
Swell 2 Height (m) Direction Period (s) | SW 16 | SW 16 | SW 13 | SW 6 | SW 14 | SW 12 | S 12 | SW 12 | SW 12 | S 11 | S 11 | S 11 | S 11 | — | — | — | — | — | — | — | — |
| kJ | 10 | 10 | 7 | 1 | 8 | 6 | 3 | 6 | 6 | 2 | 2 | 2 | 2 | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | S 13 | S 13 | S 16 | SW 14 | SW 7 | SW 14 | — | — | — | — | — | S 5 | — | — | — | — | — | — | — | — | — |
| kJ | 3 | 3 | 5 | 8 | 2 | 8 | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NE 4 | NE 4 | NNE 4 | — | NNE 3 | NNE 3 | N 4 | NNW 3 | N 3 | NNW 6 | N 6 | — | — | NNW 3 | N 3 | N 5 | N 5 | NNW 6 | — | NNW 4 | NNE 3 |
| kJ | 6 | 8 | 8 | — | 3 | 3 | 7 | 4 | 4 | 50 | 73 | — | — | 2 | 3 | 25 | 25 | 52 | — | 3 | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 312 | 267 | 326 | 208 | 208 | 267 | 326 | 1277 | 273 | 284 | 284 | 260 | 284 | 292 | 273 | 284 | 382 | 273 | 298 | 316 | 267 |
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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