Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 12 Jul 2026:
- Most powerful swell: Thursday 16 Jul, 4PM (local time) - 1.5ft (0.4m), 7s period, SW swell with 14 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 0.4m 7s and forecast to arrive on Thursday (Jul 16) at 4PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Sunday (Jul 12) at 7PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (Thu 16th Jul) | 1.5ft (0.4m) 7s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
Right then, folks, Rusty here. Let's have a look at what the next couple of weeks are shaping up to be for Trearddur Bay on Holy Island. I’ll be straight with you – this is a tough one. We’re looking at a long, dry spell with barely a ripple to get excited about for a good while.
The first proper surf we see on the cards doesn't show up until Saturday the 25th of July, and even then, it's a bit of a rough diamond. Before that, we've got a solid two-week gap with nothing worthwhile. From Sunday the 12th right through to Friday the 24th, the guidance is all flat or offering tiny, weak slop that’s just not worth paddling out for. The conditions will be clean with offshore winds most days, but with no swell to work with, it’s a case of "all dressed up with nowhere to go." The water is sitting at 61°, which feels a touch warmer than usual for this time of year, but that's about the only highlight.
The first real sign of life comes on Saturday the 25th of July. The morning sees a SSW swell pushing 3 ft, but it’s a short period windswell of 5 seconds, and it’s blowing straight onshore at 15 mph. The combined energy is moderate (47), but the quality is shot. By the afternoon, it jumps up to 6 ft from the SSW, with a period of 6 seconds and the onshore wind picks up to 22 mph. The energy builds to 204, but it’s going to be a messy, lumpy affair. This is more of a kite-surfing setup than a clean paddle session.
Sunday the 26th of July keeps that moderate energy (205) with a 5 ft SSW swell, but the period is still short at 7 seconds, and the wind is a fresh 22 mph onshore. Again, it’ll be all over the place. The waves are a bit too big for beginners, and the onshore wind will ruin any chance of a decent shape. It’s not a day for the longboard, that’s for sure.
Monday the 27th of July sees the swell drop back to 3 ft, with the energy falling to 74. The wind turns cross-onshore, which is a slight improvement, but it’s still choppy and the period is a weak 5 seconds. There’s nothing here that stands out as a winner. Honestly, if you’re desperate for a paddle, the best chance of a clean wave might be that glassy Sunday morning on the 19th of July, but it’s only 0.3 ft – barely a ripple. This is a lean period for Trearddur Bay, and it’s a case of waiting for the next proper swell to roll in.
Rusty.
Short Range ForecastMostly dry. Warm (max 24°C on Sun afternoon, min 14°C on Mon night). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Wed night, min 17°C on Fri night). Mainly fresh winds. | ||||||||||||||||||||
Sunday 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | |||||||||||||||
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) | NE 5 | NE 4 | NE 5 | NE 4 | S 19 | S 15 | S 18 | SW 18 | SW 14 | SW 16 | SW 16 | SSW 7 | SSW 6 | SW 7 | SW 7 | SW 7 | SW 6 | SW 6 | SW 6 | SW 6 | SSW 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 0 | 7 | 4 | 6 | 12 | 7 | 10 | 10 | 7 | 4 | 14 | 12 | 11 | 10 | 10 | 9 | 8 | 5 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | off | cross-off | off | off | off | off | off | cross-off | off | off | cross-off | off | cross-off | off | off | cross-off | cross-off | off | cross-off | cross-off |
High Tide | 9:34PM5.14m | 10:03AM5.23m | 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 | ||||||||
Low Tide | 3:11PM1.28m | 3:45AM1.10m | 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 | ||||||||
 | |  | | | | | | |  |  |  | | | | | | | | | | |
 | 5:05 | — | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — | 5:11 | — | — | 5:11 | — | — |
 | — | — | 9:42 | — | — | 9:40 | — | — | 9:39 | — | — | 9:38 | — | — | 9:37 | — | — | 9:36 | — | — | 9:35 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 22 | 24 | 23 | 18 | 20 | 19 | 21 | 24 | 24 | 24 | 26 | 27 | 24 | 26 | 24 | 20 | 21 | 20 | 23 | 22 | 22 |
Feels °C | 18 | 19 | 18 | 11 | 14 | 12 | 17 | 19 | 18 | 23 | 22 | 22 | 23 | 23 | 17 | 18 | 17 | 18 | 19 | 17 | 20 |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | S 19 | S 15 | S 18 | SW 18 | S 7 | S 6 | SW 6 | SSW 7 | SSW 6 | SW 7 | NE 5 | SW 7 | SW 6 | SW 6 | SW 6 | SW 6 | SSW 6 |
| kJ | — | — | — | — | 7 | 4 | 6 | 12 | 1 | 1 | 1 | 4 | 4 | 14 | 9 | 11 | 10 | 10 | 9 | 8 | 3 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SW 14 | — | SW 16 | SW 13 | — | SW 14 | SW 7 | NNE 4 | NNE 4 | SW 12 | — | S 11 | SW 11 |
| kJ | — | — | — | — | — | — | — | — | 7 | — | 10 | 7 | — | 8 | 12 | 2 | 1 | 6 | — | 2 | 5 |
Swell 3 Height (m) Direction Period (s) | NE 5 | — | — | — | — | — | W 14 | — | SW 14 | SW 16 | S 13 | — | SW 8 | — | N 5 | SSW 3 | SW 12 | — | S 11 | — | — |
| kJ | 1 | — | — | — | — | — | 4 | — | 7 | 10 | 3 | — | 3 | — | 4 | 1 | 6 | — | 2 | — | — |
Wind waves Height (m) Direction Period (s) | NE 5 | NE 4 | NE 5 | NE 4 | NNE 4 | NE 4 | NE 4 | NNE 4 | NE 5 | NE 5 | NE 4 | ENE 5 | NE 5 | NE 4 | SSE 3 | — | — | — | — | N 3 | N 3 |
| kJ | 17 | 32 | 25 | 31 | 32 | 17 | 21 | 42 | 39 | 13 | 22 | 32 | 14 | 10 | 2 | — | — | — | — | 1 | 3 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 287 | 208 | 305 | 313 | 313 | 286 | 184 | 163 | 288 | 208 | 208 | 326 | 163 | 163 | 325 | 326 | 351 | 326 | 418 | 927 | 316 |
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