Trearddur Bay (Holy Island) Surf Break

Lat Long: 53.28° N 4.62° W

Trearddur Bay (Holy Island) Surf Forecast and Surf Report

Issued: 12 am 24 Aug 2026 (local time)

Forecast update in  hr  min

Today's Trearddur Bay (Holy Island) sea temperature is
17.3°C
1.7° 

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 24 Aug 2026:

  • Most powerful swell: Friday 28 Aug, 1AM (local time) - 4ft (1.2m), 10s period, SSW swell with 272 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 10s and forecast to arrive on Friday (Aug 28) at 1AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 6s period and expected on Saturday (Aug 29) at 7AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 1AM (Fri 28th Aug)4ft (1.2m) 10s

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


The Lowdown

Alright folks, Rusty here. Let’s get straight into it for Trearddur Bay (Holy Island).

Right off the bat, I’ve got to be honest with you – this 16-day window is looking like a tough one for the paddle crew. We’ve got a long stretch of real small, weak, or blown-out conditions. The first few days are basically a write-off for any kind of decent ride. Monday the 24th and Tuesday the 25th are showing tiny 0.3ft swell with a long period energy, but it’s just not enough to do anything with, and the combined energy is barely a whisper (12). It’s clean, but there’s nothing to surf.

The gap stretches through the rest of the week. Wednesday the 26th through Friday the 28th offers a tiny bump up to 1ft, but the period drops to 8 seconds or less, and the wind is all over the place – cross-off, onshore, and that 4ft on Thursday the 27th is coming in with a short 5-second period and onshore wind, making it a total mess. The combined energy on Friday the 28th morning jumps to 228 (moderate), but the swell is 4ft from the SSW with a cross-on wind, so it’s poor surf. We’re looking at a solid week of nothing worthwhile.

The weekend (30th-31st August) is a no-go. Strong winds – 55 km/h (34 mph) on Sunday the 30th afternoon – and near gale conditions are going to make it a kiter’s session, not a surfer’s. The swell is tiny and onshore.

Then there’s a big gap. The next event of note is on Wednesday the 2nd of September. The swell jumps up to 7ft from the SW with a 7-second period. The combined energy is strong at 400. But the wind is a fresh to strong cross-onshore, making it messy and lumpy. This is a lot of water moving, but the quality is poor – definitely expert territory due to the size, but the wind is going to ruin any shape. It’s a frustrating one.

Thursday the 3rd of September is your best bet in this whole outlook, and it’s a bit of a wildcard. The morning sees a 7ft swell from the W with a 6-second period, but the wind is light and onshore. The combined energy is 286 (moderate to strong). The afternoon is a similar story with 7ft. The “marginal” tag on the morning is a hint that the tide might be a factor, but for a local, this is the only window with any real power. The wind is light, so it won’t be a total blowout, but it’s not the clean, offshore glass we’re after. You’ll be taking what you can get.

After that, the swell fades away again. Friday the 4th drops to 4ft, and from Saturday the 5th onwards we’re back to tiny 0.3ft, 1.0ft ankle-biters with long periods and no energy. The combined energy drops to 18 or 26. It’s clean, but it’s flat.

So, to sum it up: this is a quiet period, with a long gap of no surf at the start. The only real standout is Thursday the 3rd of September, where the swell is solid (7ft+) but the wind is not ideal. It’s the only window with any grunt, and it’s a “take what you can get” deal. For the rest, it’s a waiting game. Forecasts can change, so keep an eye on it, but for now, the board stays in the van.

Rusty.

Short Range Forecast

Light rain (total 3mm), mostly falling on Tue night. Warm (max 22°C on Tue afternoon, min 14°C on Sun night). Winds decreasing (fresh winds from the E on Tue night, calm by Wed morning).

Days 4-6 Weather Summary

Moderate rain (total 10mm), heaviest on Sat afternoon. Very mild (max 19°C on Wed night, min 14°C on Fri night). Wind will be generally light.

Monday
24
Tuesday
25
Wednesday
26
Thursday
27
Friday
28
Saturday
29
Sunday
30
AM
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
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.1
SW
14
0.1
SW
13
0.1
SW
13
0.1
SW
13
0.1
SW
13
0.2
SSW
8
0.4
SW
8
0.3
SSW
8
0.2
SSW
7
0.3
SSW
7
1.1
SSW
5
1.2
SSW
10
1.1
SSW
8
1
SSW
8
1.4
WNW
5
0.9
W
4
0.9
SW
4
0.7
SW
5
0.4
SW
6
0.5
SSW
8
0.7
SSW
8
Wave Graph
Metric surfscale
Energy kJ
8
7
7
7
7
7
17
12
5
10
50
272
164
119
98
31
28
25
10
35
50
Wind (km/h)
5
ESE
10
NNE
25
E
25
E
20
NE
20
ENE
15
E
5
NNE
15
ENE
10
ESE
10
SW
15
SW
10
W
20
SW
10
NW
15
SSW
20
S
30
WSW
30
SW
55
SSW
35
WSW
Wind State
cross-off
cross-off
cross-off
cross-off
off
cross-off
cross-off
off
cross-off
cross-off
on
on
cross-on
on
cross
cross-on
cross-on
cross-on
on
cross-on
cross-on
High Tide
9:08AM4.41m
9:19PM4.79m
9:52AM4.67m
9:59PM5.08m
10:26AM4.89m
10:33PM5.32m
10:57AM5.08m
11:04PM5.51m
11:27AM5.23m
11:36PM5.65m
11:57AM5.33m
00:07AM5.72m
12:28PM5.40m
00:40AM5.74m
Low Tide
3:05PM2.09m
3:35AM1.78m
3:46PM1.80m
4:11AM1.47m
4:21PM1.52m
4:43AM1.19m
4:52PM1.28m
5:14AM0.96m
5:23PM1.07m
5:44AM0.80m
5:55PM0.94m
6:16AM0.70m
6:28PM0.87m
clear
clear
part cloud
cloud
part cloud
light rain
part cloud
thunderstorm
rain showers
rain showers
cloud
clear
clear
part cloud
clear
cloud
mod rain
rain showers
rain showers
thunderstorm
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:13
6:13
6:16
6:18
6:20
6:20
6:22
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:27
8:24
8:22
8:20
8:17
8:15
8:13
 mm
1
2
1
2
7
5
1
2
2
Temp °C
18
20
19
19
22
21
19
20
19
18
18
17
16
17
16
15
16
16
16
17
15
Feels °C
16
17
14
16
18
14
20
20
18
17
17
16
15
13
14
13
13
14
11
8
8
  • 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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