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 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 28 Jul, 7PM (local time) - 5ft (1.5m), 6s period, SSW swell with 143 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 1.5m 6s and forecast to arrive on Tuesday (Jul 28) 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 0.3m 4s period and expected on Thursday (Jul 30) at 10PM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 7PM (Tue 28th Jul)5ft (1.5m) 6s

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


The Lowdown

Right then, let’s have a look at what’s on offer for Trearddur Bay (Holy Island). I've got to be straight with you – this is a grim run. The whole 16-day window is a write-off for any kind of decent surf. There’s not a single recommendation in the whole period, and the data backs that up. We’re looking at a solid block of nothing.

From Tuesday the 28th of July, it’s poor. The water is a touch warmer than normal for the time of year at 62°, but that’s no comfort. The swell is weak, with combined energy barely hitting 125 (moderate) on the Tuesday afternoon, but it’s short-period, wind-affected slop. The wind is hammering it from the SSW most of the time, 22 to 25 mph, making it a messy, cross-onshore chop. The swell height tries to get to 5 ft, but with a period of just 5 seconds, it’s just fat, lumpy junk. Not for a paddle board.

Wednesday and Thursday are even worse, with tiny 3 ft to 1 ft swell and feeble energy. The wind lightens up a bit, but the swell is gone. By Friday the 31st through to the 1st of August, it’s the same story – tiny, weak, and poor. The combined energy drops into the teens and single digits.

Then we hit a proper dead zone. From the 2nd of August, we get days with zero swell height and zero energy. Just flat, with light cross-shore breezes making a few ripples on the surface. That flat spell runs right through to the 5th of August, with only a tiny 2 ft bump on the 5th, but it’s cross-shore wind at 22 mph, creating a lumpy cross-chop. Absolutely no good.

The 6th of August sees a clean-up in wind, with a cross-offshore breeze from the NNW, but the swell is only 1.0 ft. It’s clean, but there’s nothing to ride. The same for the 7th and 8th – glassy conditions on the 8th, with a calm wind, but the swell is down to 0.3 ft. It’s a cruel tease.

The second week picks up a bit of wind but still no swell. The 9th of August has strong SSW winds at 25 mph and a total flat spell. The 10th shows a tiny 1 ft swell, but with onshore wind. It’s a hopeless pattern. The 11th and 12th are more of the same – tiny, weak, and clean but empty.

Honestly, for a spot that is inconsistent at the best of times, this is a blank run that is pretty normal for the area. The swell just isn’t there. The only thing worth noting is that from the 6th of August onward, the wind goes clean, even glassy, but there’s no wave to ride. The forecasts can change, but right now, I wouldn’t bother getting the wetsuit on. Save your energy.

Rusty

Short Range Forecast

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

Days 4-6 Weather Summary

Mostly dry. Very mild (max 18°C on Sun afternoon, min 13°C on Fri night). Winds decreasing (fresh winds from the SSW on Fri afternoon, light winds from the SE by Sun morning).

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)
1.3
SSW
5
1.5
SSW
5
1.2
SW
5
0.8
SSW
4
0.9
SSW
4
0.7
SW
5
0.8
W
4
0.4
WNW
4
0.4
SW
4
0.6
W
4
0.9
SW
4
0.6
SW
5
0.8
WNW
4
0.5
NW
4
0.3
SW
3
0.3
NE
2
0.1
SW
9
0.1
SW
9
0.1
SW
8
Wave Graph
Metric surfscale
Energy kJ
94
125
82
24
28
24
19
6
4
11
28
19
25
7
1
0
0
0
3
3
3
Wind (km/h)
35
SSW
40
SSW
30
SSW
30
SSW
25
SSW
15
WNW
25
W
10
SW
15
WNW
20
SW
30
SSW
25
W
20
WNW
10
WSW
15
S
5
SE
10
NW
15
ENE
10
SSW
10
S
10
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
cross
off
on
cross-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
part cloud
clear
cloud
rain showers
part cloud
clear
clear
clear
clear
part cloud
clear
clear
clear
part cloud
part cloud
part cloud
cloud
cloud
cloud
light rain
<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
1
Temp °C
17
17
17
18
18
15
15
16
17
14
15
17
14
15
15
17
18
17
18
19
18
Feels °C
12
11
13
15
14
13
12
14
15
11
9
12
10
13
13
15
16
14
16
17
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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