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 25 Aug 2026 (local time)

Forecast update in  hr  min

Today's Trearddur Bay (Holy Island) sea temperature is
17.2°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 Aug 2026:

  • Best quality surf: Sunday 30 Aug, 10AM (local time) - 2.5ft (0.8m), 9s period, SW swell with glassy winds.
  • Most powerful swell: Tuesday 1 Sep, 7PM (local time) - 5.5ft (1.7m), 6s period, SSW swell with 176 kJ wave energy.
  • Next surfable swell (1★+): Sunday 30 Aug, 10AM (local time) - 2.5ft (0.8m), 9s period with SW swell.

Best Forecast Surf Conditions for Trearddur Bay (Holy Island) this week:

The surf forecast for Trearddur Bay (Holy Island) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Aug 30) at 10AM. The primary swell is predicted to be 0.8m and 9s period with a secondary swell of 0.4m and 4s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Trearddur Bay (Holy Island) in the next 16 days are 1.7m 6s and forecast to arrive on Tuesday (Sep 01) at 7PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 5s period and expected on Sunday (Aug 30) at 7AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)10AM (Sun 30th Aug)2.5ft (0.8m) 9s
Best Surf10AM (Sun 30th Aug)2.5ft (0.8m) 9s
Most Powerful 7PM (Tue 1st Sep)5.5ft (1.7m) 6s

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


The Lowdown

Right then mate, Rusty here. Let’s have a look at what Trearddur Bay (Holy Island) has got cooking for us over the next couple of weeks. I’ll be straight with you – this look is a bit of a tough one. We’ve got a massive stretch of time where the surf just isn’t going to play ball. The water’s sitting at a touch warmer than usual for this time of year, running 63°F.

We kick off from the 25th of August and honestly, it’s a slow burner. For days on end we’re seeing tiny waves and poor conditions – mostly below 1ft. The wind is all over the place, and although we get some nice light breezes, the swell just isn’t there to make anything of it. There’s a long gap with no real surf on offer until we get towards the end of the month.

The first sign of life comes on the morning of Sunday, the 30th of August. It’s not a classic, but it’s the best on offer so far. We’ve got a 3ft SW swell, with a period of 9 seconds, and the wind goes glassy. The combined energy is a moderate 101, so there’s a bit of push behind it. It’ll be surfable but very ordinary. The wind is light out of the WNW, so it’s pretty much glassy. The problem is the break itself is inconsistent, so you might have to wait a while for a set. The water temperature is still a touch warmer than usual.

Tuesday the 1st of September sees a jump in size, with 5ft in the afternoon, but the wind’s a messy onshore from the WSW at 16 mph, so it’s poor. That trend continues – we see bigger lumps, like 8ft on the 3rd of September, but again, hammered by horrendous onshore gales. The swell energy gets strong at 758, but with wind like that, it’s a write-off.

If you’re an expert and you fancy a real challenge, the morning of Saturday the 5th of September throws up a weird one. A long-period 14-second groundswell from the SW, but it’s only 0.3ft. Very long period, very small, with a fresh cross-shore wind at 19 mph. It’s probably more interesting to talk about than to surf.

By the 6th of September afternoon, we get a 7ft SSW swell, but it’s cross-onshore and choppy. Then on the 7th of September, things get serious, but not in a good way for paddle surfing. We’ve got a massive 12ft SSW swell with gale-force cross-onshore winds. The combined energy is a very strong 1338. That’s kite-surfing territory, not for a surfboard.

So, to be honest, there are no true standouts in this whole 16-day window. It’s a blank run. For a spot like this, that’s just how it goes sometimes. The forecasts can change, but right now, there’s nothing to get excited about.

Rusty.

Short Range Forecast

Heavy rain (total 29mm), heaviest during Thu afternoon. Warm (max 21°C on Tue afternoon, min 16°C on Tue night). Winds decreasing (fresh winds from the E on Tue night, calm by Thu afternoon).

Days 5-7 Weather Summary

Heavy rain (total 21mm), heaviest during Sun afternoon. Very mild (max 19°C on Fri afternoon, min 13°C on Sun night). Winds decreasing (fresh winds from the NNW on Sat afternoon, calm by Sun morning).

Tue
25
Wednesday
26
Thursday
27
Friday
28
Saturday
29
Sunday
30
Monday
31
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
1
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
13
0.2
SSW
8
0.4
SW
8
0.3
SSW
8
0.2
SSW
7
0.2
SSW
7
0.1
S
12
0.2
SSW
8
0.9
SSW
7
1.2
WSW
8
1.1
SW
6
0.8
SSW
7
0.4
SSW
6
0.9
SSW
8
0.8
SW
9
0.6
SSW
8
0.4
SSW
7
0.4
SW
7
0.4
SSW
7
0.4
SSW
7
Wave Graph
Metric surfscale
Energy kJ
7
7
17
12
5
5
3
6
93
150
67
57
16
114
97
44
21
12
17
17
Wind (km/h)
10
NE
25
ESE
20
E
10
NNE
15
ENE
15
ENE
5
NNE
20
SW
15
WNW
20
SW
15
WSW
10
E
15
WSW
20
WNW
5
WNW
15
ENE
30
N
25
W
35
SW
40
SW
Wind State
off
cross-off
cross-off
cross-off
cross-off
cross-off
glassy
on
cross-on
on
on
cross-off
on
cross
glassy
off
cross-off
cross-on
on
on
High Tide
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
1:01PM5.41m
1:15AM5.69m
Low Tide
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
6:50AM0.69m
7:04PM0.89m
cloud
cloud
cloud
rain showers
rain showers
rain showers
heavy rain
heavy rain
part cloud
clear
rain showers
rain showers
light rain
part cloud
light rain
mod rain
rain showers
cloud
part cloud
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:16
6:18
6:20
6:20
6:22
6:24
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:24
8:22
8:20
8:17
8:15
8:13
8:10
 mm
1
2
1
11
14
1
4
1
1
7
7
5
Temp °C
21
20
19
21
20
18
17
16
17
19
17
17
17
14
14
14
14
14
16
16
Feels °C
17
14
19
20
19
17
18
16
15
17
15
14
16
9
13
12
10
8
10
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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