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 pm 28 Jul 2026 (local time)

Forecast update in  hr  min

Today's Trearddur Bay (Holy Island) sea temperature is
16.5° C
1.2° 

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 28 Jul 2026:

  • Most powerful swell: Tuesday 4 Aug, 1AM (local time) - 6ft (1.8m), 6s period, SSW swell with 254 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 1.8m 6s and forecast to arrive on Tuesday (Aug 04) at 1AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Sunday (Aug 02) at 10PM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 1AM (Tue 4th Aug)6ft (1.8m) 6s

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


The Lowdown

Alright folks, Rusty here. Let’s be straight with you – the next 16 days are looking pretty grim for Trearddur Bay (Holy Island). There’s nothing on offer that I’d be excited to paddle out for, so I’ll walk you through the whole stretch so you’re not left hanging.

We start off on Tuesday, 28th July, and it’s a bust. The wind is howling from the SSW at 22 mph, making the surf lumpy and cross-onshore. The swell is a weak 5 ft, but with a short, weak period of 6 seconds, and the combined energy is only 114 – it’s weak and messy. On the 29th and 30th, the swell drops off even more, barely hitting 3 ft, and the wind stays onshore or cross-onshore, so forget about clean waves. The water temp is sitting at 62°, which is a touch warmer than normal for this time of year, but that won’t help you catch a decent wave.

There’s a big gap with no surf to speak of from the 31st of July right through the 3rd of August. The swell is basically flat, with some days showing zero swell height. A few clean patches of wind pop up on the 2nd and 3rd with cross-offshore breezes, but there’s no wave energy to work with. It’s a total write-off.

Then on Tuesday, 4th August, we see a bump in energy – the combined swell energy jumps to 162, which is moderate, with a 4 ft swell from the SW. But the wind is cross-on from the SSW at 6 mph in the morning, turning into a fresh 19 mph cross-on in the afternoon, so the surf is lumpy and poor. The period is still short at 7 seconds, so it’s not going to hold any shape. The rest of the week stays poor, with small, weak swells and onshore winds. The 8th of August has a brief moment with 4 ft swell from the SSW, but again, the wind is a fresh 19 mph cross-on, making it a choppy mess.

The last few days from the 9th to the 12th of August are tiny and weak, with combined energy readings as low as 1 or 2. There’s a little clean wind on the 9th afternoon from the NNW at 19 mph, but it’s cross-offshore and the swell is only 2 ft – not worth the effort. The whole stretch is a dud.

Honestly, with the constant onshore winds and the lack of any decent swell, this setup looks more interesting for kite surfing than paddle surfing on most days, especially the 4th and 5th of August when the wind is strong. Don’t hold your breath; the forecasts can change, but right now, it’s a solid streak of poor conditions.

Rusty.

Short Range Forecast

Some drizzle, heaviest during Wed afternoon. Very mild (max 18°C on Wed morning, min 13°C on Thu morning). Winds decreasing (strong winds from the SSW on Tue afternoon, light winds from the W by Thu night).

Days 4-6 Weather Summary

Mostly dry. Warm (max 20°C on Sun night, min 13°C on Fri night). Wind will be generally light.

Tuesday
28
Wednesday
29
Thursday
30
Friday
31
Saturday
1
Sunday
2
Monday
3
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)
1.4
SSW
6
1.5
SSW
6
1.2
SW
5
0.8
SSW
4
0.8
SSW
4
0.6
SW
5
0.9
W
4
0.7
W
4
0.5
W
3
0.6
W
4
0.9
SSW
4
0.7
SW
5
0.7
W
4
0.4
NW
4
0.4
SW
3
0.1
SW
9
0.3
SSE
3
0.7
S
4
1.8
SSW
6
Wave Graph
Metric surfscale
Energy kJ
114
129
82
22
18
18
28
19
5
10
29
24
15
4
3
0
0
3
3
13
254
Wind (km/h)
35
SSW
40
SSW
30
SSW
25
SSW
30
SSW
10
W
30
WNW
15
SW
15
SSW
15
SW
25
SSW
20
WNW
20
W
15
SSW
5
SSW
15
ENE
5
N
15
ESE
15
ESE
15
SSW
20
S
Wind State
cross-on
cross-on
cross-on
cross-on
on
cross-on
cross-on
on
cross-on
on
on
cross-on
cross-on
on
cross-on
cross-off
cross-off
cross-off
cross-off
on
cross-on
High Tide
10:47AM4.83m
10:57PM5.25m
11:21AM4.96m
11:31PM5.40m
11:54AM5.05m
00:03AM5.49m
12:26PM5.10m
00:36AM5.52m
12:58PM5.13m
1:09AM5.52m
1:32PM5.12m
1:43AM5.48m
2:07PM5.09m
2:20AM5.40m
Low Tide
4:44PM1.52m
5:08AM1.29m
5:17PM1.36m
5:41AM1.11m
5:50PM1.23m
6:14AM0.99m
6:23PM1.15m
6:46AM0.92m
6:56PM1.12m
7:20AM0.89m
7:31PM1.14m
7:56AM0.93m
8:09PM1.21m
cloud
clear
clear
part cloud
light rain
clear
part cloud
clear
clear
clear
part cloud
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:26
5:28
5:30
5:31
5:33
5:35
5:37
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
9:21
9:19
9:17
9:15
9:14
9:12
9:10
 mm
1
Temp °C
17
17
17
18
18
16
14
15
16
14
15
17
14
15
15
18
19
20
19
20
18
Feels °C
12
11
13
14
14
15
10
11
13
11
9
14
11
12
12
17
17
16
17
17
15
  • 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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