Trearddur Bay (Holy Island) Surf Break

Lat Long: 53.28° N 4.62° W

Trearddur Bay (Holy Island) Surf Forecast and Surf Report

Issued: 6 pm 26 Jul 2026 (local time)

Forecast update in  hr  min

Today's Trearddur Bay (Holy Island) sea temperature is
16.9° C
1.6° 

Trearddur Bay (Holy Island) surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Trearddur Bay (Holy Island) surf forecast from 26 Jul 2026:

  • Most powerful swell: Thursday 30 Jul, 10PM (local time) - 4ft (1.2m), 6s period, SW swell with 109 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 1.2m 6s and forecast to arrive on Thursday (Jul 30) at 10PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Friday (Jul 31) at 1AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful10PM (Thu 30th Jul)4ft (1.2m) 6s

Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.


The Lowdown

Alright, let’s get into it for Trearddur Bay. It’s been a quiet spell here on Holy Island, and the next couple of weeks aren’t shaping up to be anything special. We’re stuck with small, weak swells and messy wind. There’s a real gap right at the start with no decent surf at all.

It starts on Sunday the 26th of July, and it’s a write-off. We’ve got a 4ft swell from the WNW, but with a nasty 22 mph cross-wind, it’s just lumpy and poor. The combined energy is only 117 (moderate), but the wind has ruined it. Monday the 27th drops right down to 2ft and 3ft, with onshore winds—absolutely nothing to get excited about. That poor run keeps going all through the rest of July and into the first week of August. We’re seeing tiny 2ft, 1.0ft, even 0.3ft swells, all with cross-onshore winds. The combined energy barely gets into double figures, often just a handful of points. It’s a real barren spell; there’s a solid gap of about ten days with nothing worth paddling out for.

The real standout, and the only one worth marking on your calendar, is the morning of Friday the 7th of August. We finally get a bit of life. The swell comes up to 4ft from the SW, and the combined energy hits 109 (moderate). The wind swings around to the NNW at 9 mph, giving us a clean, cross-off breeze. For Trearddur Bay, that’s a major positive. The water temperature is sitting at 62°, which is a touch warmer than normal for this time of year, which is a nice little bonus. The break is fairly exposed to the SW and the swell is right on that optimum direction. It’s an inconsistent spot, so you have to be patient, but when it works, it works. The crowd factor is “sometimes,” so you might have a few others with the same idea, but it shouldn’t be a scrap. The period is 6 seconds, so it’s a short-period wind swell, which won’t have the punch of a groundswell, but clean conditions make it rideable.

After that, it’s back to the doldrums. Saturday the 8th and Sunday the 9th of August see the swell collapse back to 1ft and 1.0ft, with the wind turning onshore again. The 9th of August afternoon has a weird 0.3ft swell with a 12-second period, but that’s just a ghost with no energy to speak of.

So, to be brutally honest, if you’re a beginner, even the Friday morning might be a bit on the bigger side. For the rest of the window, it’s a kite-surfing setup for most of it, not a paddle surfer’s paradise. The morning of the 7th of August is your one shot, and it’s a long-range call, so keep an eye on the charts, but it’s the only real blip of hope in a very flat outlook.

Rusty.

Short Range Forecast

Some drizzle, heaviest during Mon morning. Very mild (max 18°C on Mon afternoon, min 14°C on Sun night). Mainly fresh winds.

Days 5-7 Weather Summary

Mostly dry. Very mild (max 18°C on Wed afternoon, min 13°C on Thu night). Winds increasing (light winds from the W on Wed night, fresh winds from the SSW by Fri afternoon).

Sun
26
Monday
27
Tuesday
28
Wednesday
29
Thursday
30
Friday
31
Saturday
1
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.3
WNW
5
1.1
NW
5
0.6
NW
5
0.8
SW
4
0.7
SW
5
1
SSW
5
1.3
SSW
5
0.9
SSW
5
0.6
SSW
4
0.5
SSW
3
0.9
SSW
5
1.3
SW
5
0.9
SW
5
0.9
SSW
6
0.8
WNW
4
0.6
W
4
0.6
SSW
5
0.6
WNW
4
0.4
NW
4
0.3
SW
4
Wave Graph
Metric surfscale
Energy kJ
94
49
17
26
23
48
80
40
10
7
37
94
41
65
26
11
17
10
4
2
Wind (km/h)
35
WNW
30
WNW
25
SW
25
SSW
20
SSW
30
SSW
35
SSW
25
S
20
SSW
20
SSW
15
SW
20
WNW
30
SSW
20
NW
20
WSW
30
SSW
30
W
20
WNW
15
SSW
20
S
Wind State
cross
cross
on
on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
on
cross
on
cross
cross-on
on
cross-on
cross-on
on
cross-on
High Tide
9:42PM4.82m
10:10AM4.66m
10:22PM5.05m
10:47AM4.83m
10:57PM5.25m
11:21AM4.96m
11:31PM5.40m
11:54AM5.05m
00:03AM5.49m
12:26PM5.10m
00:36AM5.52m
12:58PM5.13m
1:09AM5.52m
Low Tide
3:54AM1.74m
4:07PM1.71m
4:33AM1.50m
4:44PM1.52m
5:08AM1.29m
5:17PM1.36m
5:41AM1.11m
5:50PM1.23m
6:14AM0.99m
6:23PM1.15m
6:46AM0.92m
6:56PM1.12m
part cloud
part cloud
light rain
part cloud
cloud
part cloud
part cloud
part cloud
clear
clear
cloud
part cloud
part cloud
clear
clear
clear
part cloud
part cloud
part cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:26
5:26
5:28
5:30
5:31
5:33
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
9:23
9:22
9:21
9:19
9:17
9:15
9:14
 mm
1
Temp °C
17
17
14
18
18
18
18
18
18
18
17
16
18
16
14
17
17
14
15
15
Feels °C
11
12
10
16
16
14
13
15
16
16
13
13
14
11
10
12
13
11
12
10
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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