Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 14 Jul 2026:
- Most powerful swell: Tuesday 14 Jul, 1PM (local time) - 0.5ft (0.1m), 18s period, SW swell with 12 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 18s and forecast to arrive on Tuesday (Jul 14) at 1PM. 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 Sunday (Jul 19) at 1AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Tue 14th Jul) | 0.5ft (0.1m) 18s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright folks, Rusty here with a bone-dry outlook for Trearddur Bay (Holy Island). We are looking at a long, tough stretch. The whole 16-day window is a washout; the combined swell energy barely gets a whisper, maxing out at a weak 98 on the last day, but the wind never plays ball.
Starting Tuesday, the 14th, it’s a flat tease: 0.3ft from the south with a very long 18-second period, but no push behind it (combined energy of 10). The wind is offshore, but it’s just a clean, flat ocean. This same tiny 0.3ft to 0.7ft south swell with clean offshore winds is the theme all the way through to the end of the first week, with energy readings stuck between a lousy 1 and 15. The break is "inconsistent" and "rarely breaks," and this forecast shows exactly why.
The middle of the week, from the 20th to the 22nd, we go totally flat, with zero energy and no wave height recorded. The wind is light, but there’s nothing to ride.
We see a shift in the second week. On Saturday, the 25th, the swell finally rises to 2ft from the SSW, but the wind is a light cross-onshore, and the period is a short 4 seconds. The energy is only 12, so the waves will be weak and messy. Then on Sunday the 26th, we get a 4ft pulse from the SSW, but the wind swings onshore from the southwest at 12 mph, making for a poor, lumpy mix (energy 77). Monday the 27th shows the biggest wave of the period: 5ft from the WSW, but the wind is a fresh onshore at 19 mph. The energy hits 98, but the conditions are a total mess—too big for beginners and too blown out for anyone. It only gets uglier after that, with the wind howling past 28 mph from the southwest.
With that much wind and poor surf quality at a beach setup, this is looking more interesting for kiteboarding than surfing. No standout days here. The water temp is about average for the season. For a beginner looking for a flat water paddle, the first few mornings offshore are your best bet, but you won't be catching anything.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Wed afternoon, min 16°C on Mon night). Winds decreasing (fresh winds from the ENE on Mon night, light winds from the E by Wed night). | Days 4-6 Weather SummaryMostly dry. Warm (max 20°C on Thu night, min 12°C on Fri night). Mainly fresh winds. | ||||||||||||||||||||
Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | |||||||||||||||
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) | S 18 | SW 18 | SW 14 | SW 16 | SW 16 | S 16 | SW 6 | SW 14 | SW 7 | SSW 7 | SSW 7 | SW 12 | S 11 | S 11 | S 11 | S 11 | S 10 | NNE 3 | NNW 4 | NNW 4 | N 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 6 | 12 | 7 | 10 | 10 | 7 | 1 | 8 | 2 | 5 | 6 | 6 | 2 | 2 | 2 | 2 | 2 | 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 | off | cross-off | off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off |
High Tide | 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 | 2:52PM5.06m | 3:07AM5.33m | 3:38PM4.82m | 3:53AM5.01m | |||||||
Low Tide | 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 | 8:50PM1.23m | 9:27AM1.09m | 9:37PM1.52m | |||||||
 | |  | | | | | | | | | |  | |  | | | | | | | |
 | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — | 5:15 | — | — |
 | — | — | 9:39 | — | — | 9:38 | — | — | 9:37 | — | — | 9:36 | — | — | 9:35 | — | — | 9:34 | — | — | 9:32 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 21 | 21 | 22 | 23 | 23 | 22 | 22 | 20 | 20 | 20 | 19 | 14 | 15 | 15 | 15 | 16 | 15 | 16 | 17 | 16 |
Feels °C | 14 | 16 | 16 | 19 | 19 | 19 | 18 | 17 | 17 | 17 | 16 | 16 | 9 | 9 | 10 | 11 | 12 | 12 | 13 | 13 | 13 |
Swell 1 Height (m) Direction Period (s) | S 18 | SW 18 | S 7 | S 6 | SW 6 | SSW 6 | SW 6 | SW 6 | SW 6 | NNW 4 | SSW 7 | SW 6 | SW 6 | SW 6 | S 11 | N 5 | S 10 | — | NNW 4 | — | — |
| kJ | 6 | 12 | 1 | 1 | 2 | 4 | 1 | 1 | 1 | 5 | 4 | 2 | 1 | 1 | 2 | 17 | 2 | — | 5 | — | — |
Swell 2 Height (m) Direction Period (s) | — | — | SW 14 | SW 16 | SW 16 | SW 13 | N 3 | SW 14 | SW 7 | SSW 7 | SW 12 | SW 12 | S 11 | S 11 | S 5 | S 11 | — | — | — | — | — |
| kJ | — | — | 7 | 10 | 10 | 7 | 1 | 8 | 2 | 5 | 6 | 6 | 2 | 2 | 1 | 2 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | S 14 | — | — | S 13 | S 13 | S 16 | — | — | — | S 12 | — | — | — | — | — | S 5 | — | — | — | — | — |
| kJ | 4 | — | — | 3 | 3 | 5 | — | — | — | 3 | — | — | — | — | — | 1 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NE 4 | NNE 4 | NE 4 | NE 4 | NE 4 | NNE 4 | NE 4 | NNE 3 | NNE 3 | — | N 4 | N 4 | NNW 5 | NNW 5 | N 6 | — | NNE 4 | NNE 3 | — | NNW 4 | N 4 |
| kJ | 8 | 12 | 11 | 6 | 15 | 10 | 1 | 4 | 2 | — | 9 | 22 | 45 | 32 | 122 | — | 17 | 6 | — | 5 | 5 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 184 | 208 | 288 | 306 | 364 | 353 | 343 | 382 | 326 | 306 | 580 | 332 | 273 | 330 | 59 | 298 | 284 | 284 | 332 | 339 | 292 |
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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