Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 12 Jul 2026:
- Most powerful swell: Friday 17 Jul, 7AM (local time) - 1.5ft (0.4m), 7s period, SSW swell with 21 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 Friday (Jul 17) at 7AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 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 | 7AM (Fri 17th Jul) | 1.5ft (0.4m) 7s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
Alright folks, Rusty here. Let’s have a look at what’s on the menu for Trearddur Bay.
Right off the bat, I gotta be straight with you: the next couple of weeks are looking pretty flat for Trearddur Bay (Holy Island). We’ve got a long stretch of nothing happening. From now through the 25th of July, the surf is basically a no-go. The swell is tiny, or non-existent, and the energy readings are barely a whisper – you’d be better off taking up golf for a bit.
The one glimmer, and I mean a real faint one, shows up on the morning of the 27th of July. We’ve got a solid 8ft swell rolling in from the SSW with a period of 8 seconds. That’s enough energy to get the place moving, but hold your horses – that’s a big ol’ wave for a beginner spot. Anything over 8ft is expert territory, so if you’re not a seasoned pro, give this one a miss. The wind is a light cross-shore from the NW, which will keep things from being a total mess, but it’s not the clean, glassy perfection we’d dream of.
The afternoon of the 27th looks a little better for the crew who can handle it. The swell drops a touch to 8ft from the SSW, period hanging around 7 seconds. The wind swings to a light cross-offshore from the NNW, which is a real positive. That will clean up the face nicely. It’s still a big, powerful wave, so it’s only for the experts. The water temperature is running a touch warmer than normal for this time of year, coming in at 61°.
So, if you’re desperate for a paddle, the 27th of July is the only day that might give you something. Don’t expect much before that, and if you’re a beginner, stay on the beach.
Rusty.
Short Range ForecastMostly dry. Warm (max 24°C on Sun afternoon, min 15°C on Sun night). Mainly fresh winds. | Days 5-7 Weather SummarySome drizzle, heaviest during Thu afternoon. Warm (max 24°C on Wed afternoon, min 15°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Sun 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | |||||||||||||||
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) | NE 4 | NE 5 | SE 4 | S 19 | S 15 | S 18 | SW 18 | SW 14 | SW 16 | SW 16 | SSW 6 | SW 14 | SW 14 | SW 8 | SSW 7 | SSW 7 | SW 7 | SSW 6 | SSW 6 | SSW 6 | S 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 1 | 7 | 4 | 6 | 12 | 7 | 10 | 10 | 4 | 8 | 8 | 15 | 21 | 18 | 11 | 8 | 8 | 3 | 2 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | off | off | off | off | off | off | off | off | off | off | cross-off | cross-off | off | off | cross-off | cross-off | cross-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 | 3:45AM1.10m | 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 | 8:41AM0.77m | ||||||||
 |  | | | | | | | |  |  |  |  | | | | | | | | | |
 | — | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — | 5:11 | — | — | 5:11 | — | — | 5:13 |
 | — | 9:42 | — | — | 9:40 | — | — | 9:39 | — | — | 9:38 | — | — | 9:37 | — | — | 9:36 | — | — | 9:35 | 9:34 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — |
Temp °C | 24 | 23 | 18 | 20 | 19 | 20 | 22 | 21 | 22 | 24 | 24 | 21 | 21 | 20 | 19 | 18 | 17 | 18 | 20 | 19 | 17 |
Feels °C | 19 | 19 | 11 | 14 | 14 | 15 | 16 | 14 | 19 | 20 | 20 | 21 | 20 | 20 | 16 | 14 | 15 | 14 | 17 | 17 | 14 |
Swell 1 Height (m) Direction Period (s) | — | — | SE 4 | S 19 | S 15 | S 18 | SW 18 | S 7 | S 6 | SW 6 | NE 5 | SSW 6 | NNE 4 | SW 8 | SSW 7 | SSW 7 | SW 7 | SSW 6 | SSW 6 | SSW 6 | SW 6 |
| kJ | — | — | 1 | 7 | 4 | 6 | 12 | 1 | 1 | 2 | 8 | 4 | 3 | 15 | 21 | 18 | 11 | 8 | 8 | 3 | 1 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | SW 14 | SW 16 | SW 16 | N 5 | SW 14 | SSW 6 | NNE 4 | NE 4 | — | SW 12 | S 11 | S 11 | S 11 | S 11 |
| kJ | — | — | — | — | — | — | — | 7 | 10 | 10 | 4 | 8 | 3 | 3 | 1 | — | 6 | 2 | 2 | 2 | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | W 14 | — | — | S 13 | S 13 | SSW 6 | — | SW 14 | SW 6 | S 12 | SW 12 | — | — | — | — | — |
| kJ | — | — | — | — | — | 4 | — | — | 3 | 3 | 4 | — | 8 | 1 | 3 | 6 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NE 4 | NE 5 | NE 4 | NNE 4 | NE 4 | NE 4 | NNE 4 | NE 5 | NE 5 | NE 4 | ESE 3 | NE 4 | N 4 | — | — | — | N 3 | N 5 | NNW 5 | N 6 | NNW 6 |
| kJ | 22 | 25 | 31 | 32 | 18 | 20 | 28 | 26 | 14 | 19 | 1 | 5 | 1 | — | — | — | 3 | 23 | 35 | 194 | 80 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 297 | 305 | 415 | 307 | 285 | 184 | 163 | 288 | 358 | 208 | 353 | 219 | 163 | 208 | 326 | 326 | 184 | 350 | 548 | 59 | 125 |
Best forecast wave conditions in Anglesy | |||||||||||||||||||||
Best forecast wave conditions in United Kingdom | |||||||||||||||||||||
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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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