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 08 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 8 Sep 2026:

  • Most powerful swell: Thursday 10 Sep, 4PM (local time) - 7ft (2.2m), 7s period, SW swell with 400 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 2.2m 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 1.8m 6s period and expected on Wednesday (Sep 09) at 1AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 4PM (Thu 10th Sep)7ft (2.2m) 7s

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


The Lowdown

Alright, Rusty here. Let’s get straight into it for this stretch of the coast.

Honestly, looking at the next couple of weeks, it’s a pretty grim picture. There are no good surf options on offer for the entire 16-day window. Every single day is showing poor surf conditions. It’s not just a few days, it’s a solid blank run from start to finish.

The Overall Pattern

We start with Trearddur Bay (Holy Island) , and from Tuesday the 8th to Wednesday the 23rd of September, it’s a write-off. The combined swell energy is mostly weak, with values often below 100, and only a couple of moderate bumps mid-week that still come with horrible wind. For example, on Thursday the 10th afternoon, we see a moderate energy reading (400) with a 7 ft swell from the SW, but it’s accompanied by a strong cross-onshore wind at 25 mph, making it messy and unsurfable. That pattern repeats itself: a little bump in swell, but the wind is always cross, cross-on, or onshore, and the water gets chopped up.

The water temperature is sitting at 62° on the 8th, which is a touch warmer than normal for this time of year, but honestly, with the conditions so poor, it’s hard to get excited about that.

Day by Day

There is no standout day. Not one. The wind is never clean, the swell never aligns. On the 13th, Sunday morning, we get a light cross-offshore breeze and it looks clean, but the swell is a pathetic 2 ft with a weak 39 energy reading – just not enough to bother with.

Even later in the forecast, around the 21st and 22nd, when the swell period stretches out to 13 seconds (groundswell potential), the swell height is only 0.3 ft. That’s not even a ripple.

The Bottom Line

There’s nothing to chase here. For an area like this, a long blank run like this is pretty normal when the conditions don’t line up. It won’t stay this way forever, and forecasts can change, but for now, keep the board in the bag.

Rusty.

Short Range Forecast

Light rain (total 6mm), mostly falling on Thu afternoon. Very mild (max 17°C on Thu afternoon, 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 5-7 Weather Summary

Light rain (total 3mm), mostly falling on Fri night. Very mild (max 17°C on Sat afternoon, min 13°C on Fri night). Winds decreasing (strong winds from the SSW on Sat morning, light winds from the WSW by Sun afternoon).

Tue
8
Wednesday
9
Thursday
10
Friday
11
Saturday
12
Sunday
13
Monday
14
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)
1.4
WNW
5
0.4
SW
6
0.4
SW
8
0.4
SW
8
0.9
SW
4
1.6
SSW
5
2.2
SW
7
1.3
SW
7
0.6
SW
7
0.5
SW
7
0.7
SSW
3
1.9
SW
6
1.6
SW
6
1.1
SW
7
0.7
SW
6
0.5
SW
6
0.4
SSW
6
0.8
SSW
4
0.6
SSW
4
1.5
SW
6
Wave Graph
Metric surfscale
Energy kJ
109
10
15
14
21
130
400
158
38
22
10
284
188
100
39
17
12
25
12
138
Wind (km/h)
30
WNW
40
NW
25
NW
10
WNW
25
S
40
S
40
SSW
25
WNW
25
NW
15
WNW
25
S
45
SSW
35
SW
25
WSW
10
NNW
10
WSW
25
S
20
SSW
20
SSW
10
SSW
Wind State
cross-on
cross
cross
cross
cross-on
cross-on
cross-on
cross-on
cross
cross-on
cross-on
cross-on
on
cross-on
cross-off
on
cross-on
cross-on
on
on
High Tide
9:21PM5.29m
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
Low Tide
3:33AM1.02m
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
rain showers
part cloud
part cloud
part cloud
part cloud
light rain
rain showers
clear
clear
clear
rain showers
light rain
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
clear
<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
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:52
7:50
7:46
7:45
7:42
7:39
7:37
 mm
2
1
3
1
2
Temp °C
16
14
13
14
15
16
17
17
14
15
14
16
17
17
14
15
16
17
17
18
Feels °C
10
6
8
11
10
9
14
13
10
13
12
10
12
13
12
13
14
15
15
16
  • 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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