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 09 Sep 2026 (local time)

Forecast update in  hr  min

Today's Trearddur Bay (Holy Island) sea temperature is
16.7°C
1.3° 

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 9 Sep 2026:

  • Best quality surf: Tuesday 15 Sep, 10PM (local time) - 4.5ft (1.3m), 6s period, SSW swell with cross-offshore winds.
  • Most powerful swell: Thursday 10 Sep, 4PM (local time) - 8ft (2.4m), 7s period, SSW swell with 530 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 15 Sep, 10PM (local time) - 4.5ft (1.3m), 6s period with SSW 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 Tuesday (Sep 15) at 10PM. The primary swell is predicted to be 1.3m and 6s period. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Trearddur Bay (Holy Island) in the next 16 days are 2.4m 7s and forecast to arrive on Thursday (Sep 10) at 4PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Wednesday (Sep 09) at 10AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)10PM (Tue 15th Sep)4.5ft (1.3m) 6s
Best Surf10PM (Tue 15th Sep)4.5ft (1.3m) 6s
Most Powerful 4PM (Thu 10th Sep)8ft (2.4m) 7s

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


The Lowdown

Alright folks, Rusty here. Let's have a look at what Trearddur Bay (Holy Island) has in store for us. I gotta be straight with you—it's not looking like the best run for this spot over the next 16 days. There are long gaps with nothing really happening, so patience is going to be key.

The overview is pretty quiet. We're starting off with a lot of small, weak swell and mostly onshore or cross-shore winds that are just killing any chance of a decent wave. For the first week, from today, September 9th, right through to the 15th, it's a write-off. The swell is tiny, the period is short, and the wind is all over the place. The combined wave energy is weak, staying well under 100 for most of that time—a lot of it sitting in the teens and single digits. It's just flat and messy.

There is a bit of a spike on Thursday the 10th, with swell jumping to 5 ft in the morning and 8 ft in the afternoon, but the wind is howling from the south at 25 mph, making it a complete washing machine. That's not surfable, that's a survival mission. The wave energy gets up into the moderate range and even strong (154 to 530), but with that wind, it's just a churned-up mess.

The first real glimmer of hope doesn't come until Wednesday morning, September 16th. We've got a clean 4 ft swell with a light cross-offshore breeze from the east-southeast. The period is a short 6 seconds, so it won't be the most powerful, but it's clean and rideable. The wave energy is moderate at 131. It's a tiny window, though; by the afternoon, the wind swings around and messes it up again.

After that, it dries right up again. From the 17th right through to the 24th, we're looking at tiny swell—mostly under 3 ft—and while there are a few clean days towards the end (the 20th to the 24th) with glassy or offshore winds, the swell is just too small to get excited about. It's flat. A few days, like Tuesday the 22nd, have a glassy 3 ft wave, but with a period of 4 seconds, it's going to be a dribbly close-out.

Honestly, the standout by default is that Wednesday morning on the 16th. It's the only time we get both a bit of size and clean conditions. For a beginner spot, anything over 5 ft starts to get a bit much, so the 4 ft isn't too bad, and the light offshore wind will make it glassy. Just don't expect power or consistency from that short-period swell.

So, there you have it. It's a long, quiet period for Trearddur Bay. Keep an eye on the 16th, but otherwise, the board is staying in the van for a while.

Rusty

Short Range Forecast

Light rain (total 4mm), mostly falling on Thu afternoon. Very mild (max 17°C on Thu night, min 13°C on Tue night). Winds increasing (light winds from the WNW on Wed afternoon, strong winds from the SSW by Thu morning).

Days 4-6 Weather Summary

Light rain (total 6mm), mostly falling on Fri night. Very mild (max 19°C on Mon afternoon, min 13°C on Sat night). Winds decreasing (strong winds from the SSW on Sat morning, light winds from the SW by Sun afternoon).

Wednesday
9
Thursday
10
Friday
11
Saturday
12
Sunday
13
Monday
14
Tuesday
15
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
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.4
SW
8
0.4
SW
8
0.9
SW
4
1.6
SSW
6
2.4
SSW
7
1.2
SSW
7
0.7
SW
7
0.6
SSW
7
0.9
SSW
4
2.1
SW
7
1.7
SW
7
0.7
SW
7
0.4
SSW
6
0.4
SW
6
0.6
SSW
3
1.2
SSW
5
0.9
SSW
5
1.3
SSW
6
1
SSW
5
0.7
SSW
4
1.5
SSW
6
Wave Graph
Metric surfscale
Energy kJ
15
14
24
154
530
134
47
30
24
381
271
46
16
9
8
62
36
97
48
18
148
Wind (km/h)
25
NW
10
WNW
25
SSW
40
S
45
SSW
20
W
25
WNW
10
WNW
30
S
45
SSW
35
SW
30
NW
15
NW
10
SW
25
S
25
S
20
SSW
25
S
25
SSW
10
SW
10
ESE
Wind State
cross
cross
cross-on
cross-on
cross-on
cross-on
cross
cross
cross-on
on
on
cross
cross
on
cross-on
cross-on
cross-on
cross-on
on
on
cross-off
High Tide
9:53AM5.26m
10:08PM5.63m
10:36AM5.47m
10:49PM5.85m
11:14AM5.59m
11:28PM5.95m
11:50AM5.61m
00:04AM5.91m
12:25PM5.56m
00:40AM5.77m
1:00PM5.44m
1:15AM5.55m
1:34PM5.27m
1:50AM5.26m
Low Tide
3:50PM1.24m
4:19AM0.68m
4:32PM0.95m
5:00AM0.47m
5:11PM0.75m
5:39AM0.42m
5:49PM0.68m
6:16AM0.50m
6:26PM0.74m
6:52AM0.70m
7:02PM0.91m
7:27AM0.99m
7:38PM1.17m
clear
clear
cloud
light rain
rain showers
clear
cloud
clear
rain showers
rain showers
rain showers
part cloud
part cloud
part cloud
clear
part cloud
part cloud
part cloud
part cloud
cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:39
6:41
6:43
6:45
6:47
6:48
6:50
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:50
7:46
7:45
7:42
7:39
7:37
7:35
 mm
1
3
3
2
1
Temp °C
13
14
15
16
16
17
13
14
16
16
17
15
13
14
15
16
19
19
19
18
19
Feels °C
8
12
10
9
12
14
9
12
8
9
12
10
11
12
11
13
17
17
17
18
18
  • 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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