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 am 05 Sep 2026 (local time)

Forecast update in  hr  min

Today's Trearddur Bay (Holy Island) sea temperature is
17.0°C
1.5° 

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 5 Sep 2026:

  • Most powerful swell: Monday 7 Sep, 4PM (local time) - 7ft (2.1m), 6s period, SW swell with 320 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 2.1m 6s and forecast to arrive on Monday (Sep 07) at 4PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Saturday (Sep 12) at 7AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 4PM (Mon 7th Sep)7ft (2.1m) 6s

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


The Lowdown

G’day, Rusty here. Look, I’ve looked hard at the charts for Trearddur Bay (Holy Island) and I’ve got to be straight with you – the next 16 days are a tough watch. There’s not a single recommendation in the whole run. Let’s talk about why.

The first week is a mess of strong onshore and cross-onshore winds, mostly from the south and west, with fresh to strong breezes up to 25 mph. The swell is there, but it’s either short-period windswell or just poorly aligned. Saturday the 5th sees a 3ft W swell with a 5-second period, but it’s cross-on and choppy – energy is weak at 70. Sunday the 6th has a bit more size, 4ft to 5ft from the SSW, but with 22-25 mph cross-on winds, it’s just messy and lumpy. Monday the 7th afternoon gets up to 7ft from the SW, but again, onshore and blown out. The combined energy on Monday afternoon hits 320, which is moderate, but without clean wind, it’s a wasted push. Water temp is sitting around 63°F, which is a touch warmer than normal for this time of year, not that you’d want to be out in it.

The second week fades badly. From Tuesday the 10th through to the 20th, the swell drops to nothing – we’re talking 0.3ft to 1ft, with combined energy mostly under 10. The wind does go offshore from the north and northeast from the 17th onwards, which is clean, but there’s simply no swell to ride. A few specs of 0.3ft with a 14-second period show up on the 20th, but that’s groundswell with no height to speak of.

Honestly, there’s no standout day, no break to highlight, no best option. This is a proper blank run. For Trearddur Bay, it’s a beach-and-reef setup, and with this much wind and poor quality, you’d be better off looking at kite surfing setups if you’re desperate. Otherwise, save the petrol. Forecasts can change, but right now, it’s a no-go.

Rusty.

Short Range Forecast

Light rain (total 8mm), mostly falling on Sat night. Very mild (max 19°C on Sun afternoon, min 13°C on Mon night). Winds increasing (light winds from the SW on Sat morning, strong winds from the SW by Mon afternoon).

Days 4-6 Weather Summary

Light rain (total 9mm), mostly falling on Wed night. Very mild (max 17°C on Thu morning, min 13°C on Tue night). Winds increasing (moderate winds from the W on Wed morning, strong winds from the SSW by Wed night).

Saturday
5
Sunday
6
Monday
7
Tuesday
8
Wednesday
9
Thursday
10
Friday
11
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)
1
W
5
0.5
SW
6
1
SSW
4
1.3
SSW
5
1.5
SSW
6
1.4
SW
6
0.4
SW
14
2.1
SW
6
1.9
SW
6
1.9
WSW
6
1.5
W
6
1.4
NW
6
0.4
SW
6
0.5
WSW
4
0.6
SW
4
1.8
SW
6
1.2
SW
7
1.3
WSW
4
1.6
WNW
6
1.6
WNW
6
1.3
NW
5
Wave Graph
Metric surfscale
Energy kJ
49
16
35
88
134
147
52
320
275
263
144
123
11
8
12
231
127
62
161
148
96
Wind (km/h)
20
W
20
SSW
30
S
35
S
40
SSW
25
WSW
30
SW
40
SW
35
WSW
35
WSW
30
W
35
WNW
30
NW
20
SSW
35
SW
40
WSW
30
WSW
45
W
35
WNW
30
WNW
25
WNW
Wind State
cross-on
on
cross-on
cross-on
cross-on
cross-on
on
on
cross-on
cross-on
cross-on
cross
cross
on
on
on
on
cross-on
cross
cross-on
cross
High Tide
5:21PM4.55m
6:18AM4.51m
7:01PM4.59m
7:54AM4.65m
8:23PM4.91m
9:02AM4.96m
9:21PM5.29m
9:53AM5.26m
10:08PM5.63m
10:36AM5.47m
10:49PM5.85m
11:14AM5.59m
11:28PM5.95m
Low Tide
10:59AM2.01m
11:50PM1.99m
12:31PM2.14m
1:25AM1.84m
1:57PM1.96m
2:38AM1.44m
3:00PM1.61m
3:33AM1.02m
3:50PM1.24m
4:19AM0.68m
4:32PM0.95m
5:00AM0.47m
5:11PM0.75m
clear
part cloud
light rain
rain showers
part cloud
rain showers
part cloud
light rain
rain showers
clear
part cloud
part cloud
clear
part cloud
rain showers
part cloud
rain showers
part cloud
cloud
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:33
6:35
6:37
6:39
6:39
6:41
6:43
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:59
7:57
7:53
7:52
7:50
7:46
7:45
 mm
2
2
1
2
1
8
1
Temp °C
14
15
15
18
19
17
15
16
15
14
16
14
14
15
16
17
17
16
15
16
15
Feels °C
11
11
10
11
13
13
9
9
9
6
9
7
10
9
9
11
12
9
7
10
9
  • 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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