Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 14 Jul 2026:
- Most powerful swell: Tuesday 14 Jul, 4PM (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 4PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 5s period and expected on Saturday (Jul 18) at 1PM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 4PM (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 look at the next couple of weeks. Let’s be straight with you—this is a tough one for Trearddur Bay. The whole 16-day window looks like a bit of a flat spell, so if you’re hanging out for a proper session, you might need to find something else to do.
We start off the run on Tuesday, July 14th, with nothing but tiny, weak dribble. The swell is a miserable 0.3ft from the south, with a long period of 18 seconds, but that’s just a ghost out there—the combined energy is barely a whisper at just 10 (weak). The water is a touch warmer than average at 61°F, but it’s not going to help much. Winds are offshore from the ENE at 15 mph, which would be clean if there was any wave to ride, but there isn’t. This pattern just keeps repeating itself day after day. We’re looking at a solid stretch of days with zero or near-zero swell, all the way through to the end of July.
The only real flicker of life appears on the 26th of July, when we finally see a bit of a pulse. The swell bumps up to 3ft on Sunday morning, coming from the SSW with a very short period of 4 seconds. The combined energy ticks up to 31 (still weak). Don’t get too excited, though—the wind is cross-shore from the NW at 12 mph, and it’s bringing a knee-high, messy crumble. The break is inconsistent, and when it’s this small and weak, it’s only really going to be of interest to beginners looking for a very gentle paddle. The crowds are sometimes around, but with conditions this poor, you’ll probably have it to yourself.
From there, the forecast goes a bit lumpy and cross-onshore, even if the swell tries to hang around at 2ft to 3ft. The wind on the 27th whips up to 22 mph from the WNW, and the combined energy hits 52 (still weak)—that’s just a messy, choppy affair that’s better suited for a kite than a paddle.
So, the bottom line: there are no true standout days here. The best of a bad bunch is probably the morning of the 26th, but even that’s a stretch. It’s a long, dry run, and for a spot like Trearddur Bay, this kind of flat spell can be pretty normal. Keep an eye on the charts, though—things can change.
Rusty out.
Short Range ForecastMostly dry. Warm (max 23°C on Wed afternoon, min 17°C on Tue morning). Winds decreasing (fresh winds from the ENE on Tue night, light winds from the ENE by Wed night). | Days 4-6 Weather SummaryMostly dry. Warm (max 21°C on Fri morning, min 12°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
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 14 | SSW 6 | SSW 6 | SW 12 | S 11 | S 11 | S 11 | S 11 | S 10 | S 10 | N 5 | N 5 | N 4 |
Wave Graph  | |||||||||||||||||||||
 kJ | 6 | 12 | 7 | 10 | 10 | 7 | 1 | 8 | 8 | 4 | 6 | 6 | 2 | 2 | 2 | 2 | 2 | 2 | 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 | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross | cross-off | cross-off | cross-off | cross-off | 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 | 4:59PM0.91m | 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 | 23 | 22 | 20 | 21 | 21 | 18 | 15 | 17 | 17 | 17 | 18 | 16 | 13 | 17 | 19 |
Feels °C | 14 | 16 | 15 | 19 | 18 | 18 | 19 | 17 | 16 | 18 | 17 | 16 | 11 | 14 | 15 | 14 | 15 | 13 | 9 | 14 | 17 |
Swell 1 Height (m) Direction Period (s) | S 18 | SW 18 | S 7 | S 6 | SW 6 | SSW 6 | N 4 | S 6 | SW 7 | NNW 3 | SSW 6 | SW 6 | SW 6 | SW 6 | S 11 | S 11 | S 10 | S 10 | — | — | NNW 3 |
| kJ | 6 | 12 | 1 | 1 | 2 | 4 | 1 | 1 | 2 | 2 | 4 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | — | — | 1 |
Swell 2 Height (m) Direction Period (s) | — | — | SW 14 | SW 16 | SW 16 | SW 13 | SW 6 | SW 14 | SW 12 | SSW 6 | SW 12 | SW 12 | S 11 | S 11 | S 5 | — | — | — | — | — | — |
| kJ | — | — | 7 | 10 | 10 | 7 | 1 | 8 | 6 | 4 | 6 | 6 | 2 | 2 | 1 | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | S 14 | — | — | S 13 | S 13 | S 16 | — | S 7 | SW 14 | S 12 | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 4 | — | — | 3 | 3 | 5 | — | 1 | 8 | 3 | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | NE 4 | NE 4 | NE 4 | NE 4 | NE 4 | NNE 4 | — | NNE 3 | NNE 3 | — | NNW 3 | N 4 | NNW 5 | NNW 5 | N 5 | N 5 | N 4 | N 4 | N 5 | N 5 | N 4 |
| kJ | 8 | 15 | 11 | 6 | 11 | 9 | — | 4 | 3 | — | 3 | 7 | 35 | 42 | 42 | 17 | 11 | 17 | 24 | 15 | 9 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 184 | 286 | 267 | 312 | 364 | 353 | 314 | 292 | 306 | 288 | 565 | 318 | 273 | 1080 | 436 | 284 | 284 | 273 | 284 | 318 | 284 |
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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