Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 12 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 1.1m 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 | 1PM (Tue 14th Jul) | 0.5ft (0.1m) 18s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
Alright folks, it’s Rusty here. Let’s be straight with you; the next couple of weeks look pretty bleak for a paddle. We’re looking at Trearddur Bay (Holy Island) and, honestly, the swell is going to be a no-show for the vast majority of the 16-day period. There’s a long, dry gap of surfable energy from now until about the 26th of July.
Right now, through the 12th and 13th of July, we’ve got fresh offshore winds but absolutely zero swell to work with. The combined energy is sitting at 0, so don’t even bother. This flat spell runs deep into the week. By Thursday the 16th, we get a tiny blip of 0.7 ft from the SSW, but it’s a weak, short-period 7-second swell, and the energy is practically nothing (5). It’s not worth paddling out for.
The story doesn’t change much. For the next week and a half, we’re looking at tiny 0.3 ft to 1 ft waves with combined energy readings that barely hit double digits. The wind is usually offshore or clean, but without any swell, that’s like having a perfect road with no car to drive. The best conditions we’ll see are glassy mornings on the 20th and 22nd of July, but with zero swell, it’s flat as a pancake.
Finally, around the 26th of July, we see a slight pulse. Sunday morning the 26th brings 2 ft from the S with a short 3-second period, and the energy is still weak (11). The afternoon pushes up to 2 ft from the SSW, but the period is still short (4 seconds) and the wind turns cross-shore, making it choppy. It’s messy and small. The 27th of July offers a similar story with 2 ft from the SSW.
There is no standout session here. Nothing is worth highlighting. The water temp is about average for the time of year, but that’s the only good news. This is a classic quiet spell for the area. Keep the board in the car for the next two weeks, check the forecasts, and hope something changes. It tends not to stay this poor for long.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Tue afternoon, min 14°C on Mon night). Mainly fresh winds. | Days 4-6 Weather SummarySome drizzle, heaviest during Fri afternoon. Warm (max 29°C on Wed afternoon, min 17°C on Tue night). Winds decreasing (fresh winds from the E on Tue night, calm by Wed night). | ||||||||||||||||||||
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 | S 16 | SSW 7 | SSW 7 | SW 7 | SW 6 | SW 6 | SSW 6 | SSW 6 | SW 6 | S 11 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 0 | 7 | 4 | 6 | 12 | 7 | 10 | 10 | 5 | 5 | 10 | 11 | 10 | 10 | 7 | 5 | 5 | 3 |
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 | glassy | cross-on | cross-on | cross-on | cross-on | cross-off | cross-off | off | off |
High Tide | 9:01AM5.02m | 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 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — |
Temp °C | 22 | 24 | 23 | 18 | 20 | 19 | 21 | 26 | 24 | 25 | 29 | 27 | 21 | 22 | 20 | 19 | 20 | 20 | 24 | 25 | 24 |
Feels °C | 18 | 18 | 18 | 11 | 14 | 13 | 17 | 21 | 17 | 23 | 24 | 20 | 21 | 20 | 19 | 19 | 20 | 20 | 21 | 21 | 21 |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | S 19 | S 15 | S 18 | SW 18 | S 7 | SE 4 | S 6 | SW 7 | NE 4 | SSW 7 | SW 7 | SW 6 | SW 6 | SSW 6 | SSW 6 | SW 6 | SSW 5 |
| kJ | — | — | — | — | 7 | 4 | 6 | 12 | 1 | 1 | 1 | 2 | 3 | 10 | 11 | 10 | 10 | 7 | 3 | 5 | 3 |
Swell 2 Height (m) Direction Period (s) | NE 5 | — | — | N 5 | — | — | — | — | SW 14 | S 6 | — | S 13 | SSW 7 | NNE 4 | NE 4 | NE 4 | — | SW 12 | SW 11 | S 11 | S 11 |
| kJ | 1 | — | — | 2 | — | — | — | — | 7 | 1 | — | 3 | 5 | 2 | 3 | 1 | — | 6 | 5 | 2 | 2 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | S 15 | — | W 14 | S 14 | SW 14 | SW 16 | SW 16 | S 16 | — | SW 14 | SW 12 | S 12 | SW 12 | — | — | — | — |
| kJ | — | — | — | — | 4 | — | 4 | 4 | 7 | 10 | 10 | 5 | — | 8 | 6 | 3 | 6 | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NE 5 | NE 4 | NE 5 | NE 4 | NNE 4 | NE 4 | NE 4 | NE 4 | NE 5 | NE 5 | NE 5 | E 3 | — | — | — | — | — | — | — | — | N 3 |
| kJ | 17 | 40 | 32 | 19 | 32 | 17 | 21 | 27 | 38 | 22 | 14 | 7 | — | — | — | — | — | — | — | — | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 287 | 208 | 305 | 313 | 284 | 286 | 184 | 163 | 288 | 184 | 351 | 361 | 368 | 382 | 326 | 371 | 556 | 362 | 418 | 923 | 316 |
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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