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 26 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:

  • Most powerful swell: Saturday 29 Aug, 7PM (local time) - 6.5ft (2.0m), 8s period, SSW swell with 429 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 2.0m 8s and forecast to arrive on Saturday (Aug 29) at 7PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Friday (Aug 28) at 7AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 7PM (Sat 29th Aug)6.5ft (2.0m) 8s

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


The Lowdown

Alright, this is Rusty. Let’s break down what’s coming up for Trearddur Bay (Holy Island).

Honestly, the next week and a half is a total loss for any decent paddle surfing. Wednesday 27th August morning has a tiny 0.3 ft swell, and even with a light breeze, there’s just no power. The forecast shows a long stretch of poor surf conditions right through until the morning of Friday 4th September. That’s a solid gap of about a week with nothing worth paddling out for. The swell energy is tiny (22) and when it’s not tiny, the wind is howling onshore, making a mess of things. You’d be better off with a kite if that’s your game, because the cross-onshore winds on Saturday 29th August are blowing 18 mph with a lumpy 5.6 ft swell (combined energy 218), but it’s all chop and no shape for a surfboard.

Now, the one bright spot might be early Friday 4th September. The morning brings a cleaner picture: a gentle northerly cross-offshore breeze will tidy up a 3.6 ft swell from the SW. It’s short-period (5 seconds) and the energy is modest (74), but it’ll be clean. The water temperature is about average for this time of year. Keep in mind Trearddur Bay is inconsistent, so windows like this are rare – don’t sleep on it. It’s surfable but very ordinary. For a beginner-friendly spot, that’s about as good as it gets in this outlook.

Saturday 5th September morning has a glassy start with no wind and a 0.3 ft swell from the SW but a very long period of 14 seconds. The energy is almost nil (16), so it’s a flat spell, not a session.

That’s the story here, folks. A long dry spell, a brief clean-up on Friday the 4th, then back to waiting. Hope the forecasts shift.

Short Range Forecast

Heavy rain (total 31mm), heaviest during Thu afternoon. Warm (max 22°C on Wed afternoon, min 16°C on Tue night). Winds increasing (light winds from the SSE on Wed morning, fresh winds from the SSW by Thu night).

Days 4-6 Weather Summary

Heavy rain (total 24mm), heaviest during Sun morning. Very mild (max 18°C on Sat morning, min 13°C on Mon morning). Winds decreasing (strong winds from the S on Sat morning, light winds from the NW by Sun night).

Wednesday
26
Thursday
27
Friday
28
Saturday
29
Sunday
30
Monday
31
Tuesday
1
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)
0.4
SW
8
0.3
SSW
8
0.2
SSW
7
0.2
SSW
7
0.2
SSW
7
0.4
SW
8
0.9
SSW
7
1
SW
7
1.4
SSW
6
1.7
SSW
6
1.6
SSW
7
1.5
SSW
9
0.9
SW
9
0.7
SW
8
0.6
SSW
7
0.9
WNW
5
1
SW
4
1.5
SW
6
1.4
SW
7
0.9
SW
7
0.6
SSW
7
Wave Graph
Metric surfscale
Energy kJ
17
12
5
6
4
16
77
96
114
218
222
362
110
64
36
35
34
164
158
67
29
Wind (km/h)
20
E
15
NNE
15
ENE
10
E
20
ENE
30
SSW
10
WNW
15
SW
30
SSW
30
S
30
SW
30
W
20
S
25
SSW
20
NW
30
WNW
30
SW
15
W
25
S
40
SSW
45
SSW
Wind State
cross-off
cross-off
off
cross-off
off
on
cross-on
on
cross-on
cross-on
on
cross-on
cross-on
cross-on
cross
cross-on
on
cross-on
cross-on
cross-on
on
High Tide
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
1:36PM5.36m
1:53AM5.56m
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
7:26AM0.78m
7:42PM1.01m
cloud
clear
part cloud
cloud
heavy rain
heavy rain
clear
clear
rain showers
rain showers
rain showers
part cloud
mod rain
rain showers
rain showers
clear
rain showers
part cloud
part 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
6:26
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:22
8:20
8:17
8:15
8:13
8:10
8:08
 mm
14
16
7
5
1
6
3
1
1
2
Temp °C
19
22
21
20
17
16
17
17
17
18
17
16
16
16
16
15
17
17
16
16
17
Feels °C
18
21
20
19
15
13
17
16
13
12
13
11
13
12
14
9
13
14
13
10
14
  • 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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