Surf Forecasts:
Trearddur Bay (Holy Island) surf forecast from 18 Jul 2026:
- Most powerful swell: Saturday 25 Jul, 1PM (local time) - 1.5ft (0.5m), 4s period, WNW swell with 8 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 0.5m 4s and forecast to arrive on Saturday (Jul 25) at 1PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Wednesday (Jul 22) at 10AM.
| Wave Type | Time (BST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 1PM (Sat 25th Jul) | 1.5ft (0.5m) 4s |
Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s have a look at what’s on offer for Trearddur Bay on Holy Island.
Honestly, I’m looking at a pretty flat and quiet run for the next couple of weeks. There’s a big gap with nothing surfable from right now all the way through until the end of July. The first recommendation that even pops up isn’t until the very end of the window, and even then, it’s not much to shout about.
The first spot that gets the nod is Trearddur Bay (Holy Island) on Thursday, the 30th of July. We’re looking at some swell filling in, with waves around 4 ft from the SW. The period is a short 6 seconds, so it’ll be a bit weak and won’t have much punch. The combined energy is moderate at 108. The wind is blowing straight onshore from the SSW at 9 mph, which is going to mess up the surface. The water temperature is a touch warmer than normal, sitting around 62°.
The best chance in this whole outlook is on Friday, the 31st of July. The swell picks up to 5 ft from the west, with a period of 5 seconds. The combined energy gets up to 120. The wind is light from the west at 3 mph, making it a light cross-onshore with small wind ripples. It’s the best of a bad bunch, but it’s still a little on the small side with a short period, and it’s not clean. The consistency is inconsistent, so you’ll be waiting for sets. This is a beginner spot, so that 5 ft might be a bit much for complete novices.
After that, it drops back down. The swell fades away quickly, and the wind picks up again, turning nasty with strong onshore breezes. The outlook is pretty grim overall. There’s a lot of nothing in the first two weeks, and even the “best” day is pretty average. This is the kind of forecast that makes you check the webcams and hope for a change.
Rusty.
Short Range ForecastMostly dry. Very mild (max 17°C on Sun afternoon, min 13°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 17°C on Tue afternoon, min 11°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Sat 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | ||||||||||||||
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 11 | S 11 | S 11 | S 10 | N 4 | N 5 | N 5 | N 6 | NNW 5 | N 4 | N 6 | NNW 6 | NNW 6 | N 6 | NNW 5 | W 3 | NNW 5 | S 13 | S 13 | WSW 3 |
Wave Graph  | ||||||||||||||||||||
 kJ | 2 | 2 | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 3 | 3 | 2 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-on | on | cross-on | cross-on | cross-on |
High Tide | 2:22AM5.60m | 2:52PM5.06m | 3:07AM5.33m | 3:38PM4.82m | 3:53AM5.01m | 4:26PM4.58m | 4:45AM4.69m | 5:23PM4.40m | 5:49AM4.42m | 6:33PM4.31m | 7:10AM4.28m | 7:50PM4.38m | ||||||||
Low Tide | 8:05PM1.00m | 8:41AM0.77m | 8:50PM1.23m | 9:27AM1.09m | 9:37PM1.52m | 10:16AM1.45m | 10:29PM1.82m | 11:11AM1.78m | 11:31PM2.09m | 12:17PM2.03m | 00:48AM2.22m | 1:29PM2.12m | 2:05AM2.17m | |||||||
 |  |  | |  | | | | | | | | | | | | | | |  | |
 | — | — | 5:13 | — | — | 5:15 | — | — | 5:16 | — | — | 5:18 | — | — | 5:20 | — | — | 5:20 | — | — |
 | — | 9:35 | — | — | 9:34 | — | — | 9:32 | — | — | 9:30 | — | — | 9:30 | — | — | 9:28 | — | — | 9:27 |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 16 | 16 | 14 | 17 | 16 | 14 | 15 | 15 | 16 | 17 | 15 | 14 | 15 | 15 | 13 | 17 | 17 | 14 | 16 | 17 |
Feels °C | 13 | 14 | 11 | 14 | 13 | 11 | 12 | 12 | 12 | 14 | 13 | 10 | 11 | 12 | 11 | 16 | 16 | 11 | 12 | 14 |
Swell 1 Height (m) Direction Period (s) | SW 6 | S 11 | S 11 | S 10 | — | — | — | — | — | — | — | — | — | — | — | N 5 | NNW 5 | N 4 | N 4 | WSW 3 |
| kJ | 1 | 2 | 2 | 2 | — | — | — | — | — | — | — | — | — | — | — | 18 | 8 | 4 | 1 | 2 |
Swell 2 Height (m) Direction Period (s) | S 11 | S 5 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 13 | S 13 | — |
| kJ | 2 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 3 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | S 13 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | — |
Wind waves Height (m) Direction Period (s) | N 5 | N 5 | N 4 | NNW 4 | N 4 | N 5 | N 5 | N 6 | NNW 5 | N 4 | N 6 | NNW 6 | NNW 6 | N 6 | NNW 5 | W 3 | — | — | W 3 | — |
| kJ | 57 | 33 | 10 | 9 | 7 | 25 | 18 | 77 | 25 | 15 | 106 | 160 | 108 | 62 | 36 | 1 | — | — | 1 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 284 | 241 | 284 | 284 | 273 | 284 | 1011 | 273 | 323 | 306 | 59 | 293 | 589 | 59 | 267 | 280 | 283 | 293 | 1103 | 251 |
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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