Trearddur Bay (Holy Island) Surf Break

Trearddur Bay (Holy Island) Surf Forecast and Surf Report

Lat Long: 53.28° N 4.62° W

Issued: 6 am 06 Jul 2026 (local time)

Forecast update in  hr  min

Today's Trearddur Bay (Holy Island) sea temperature is
15.3° C

1.0°C warmer than normal for this time of year

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 6 Jul 2026:

  • Most powerful swell: Tuesday 7 Jul, 1AM (local time) - 2.5ft (0.8m), 5s period, SSW swell with 33 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 0.8m 5s and forecast to arrive on Tuesday (Jul 07) 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 1.3m 6s period and expected on Saturday (Jul 11) at 1AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 1AM (Tue 7th Jul)2.5ft (0.8m) 5s

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


Updates in  hr  min  s Forecast update imminent

Right then, let’s have a look at what Trearddur Bay (Holy Island) has in store for us over the next couple of weeks.

To be straight with you, this is a tough one. The whole 16-day window is basically a write-off for any proper surfing. We're looking at a long, blank run with nothing worth paddling out for. The swell just isn't showing up, and when there is a tiny bump, the wind or period is all wrong. It’s one of those spells where you’re better off leaving the boards in the van and finding something else to do.

Monday morning, the 6th of July, we get a tiny 1 ft swell from the SSW, but it's only a 4-second period – that's pure wind chop, no shape to it at all. The wind is onshore from the SW at 6 mph, and the combined energy is a measly 10 (weak). Tuesday the 7th is hardly any better with a 2 ft swell from the NW, but the period is still a hopeless 4 seconds and there's cross-onshore wind. Wednesday the 8th is completely flat.

There's a period from the 9th through to the 17th where there are some clean conditions with light cross-offshore and offshore winds – which is frustrating because the swell is virtually non-existent. On the 13th and 14th of July, we see a tiny 0.3 ft swell from the south with a very long period (15-18 seconds). That kind of period groundswell has energy, but there's no height behind it. The combined energy is only in the range of 4 to 12 (weak), so it’s just not enough to break. The offshore winds from the NE are blowing beautifully clean, but there’s nothing to ride.

The best we see, relatively speaking, comes right at the tail end. On the 18th of July, swell picks up a touch to 3-3 ft from the NW with a 4-second period. The combined energy hits 35-43 (weak), but the wind is cross-onshore and it'll be choppy and messy. It’s still well under 3 ft, so not even a beginner's wave, and the short period means no power.

Sunday the 19th and Monday the 20th of July go back to a tiny 0.3 ft of south swell. Then on the 21st of July, Tuesday morning, we see the most promising-looking bump: 3 ft from the SW, 6-second period, clean cross-offshore NNW wind at 16 mph, and a combined energy of 63 (still weak). It's the only session that might offer a knee-high wave with a bit of slight shape, but the period is too short to hold up, and Trearddur Bay is an inconsistent spot anyway, needing a proper SW groundswell to work.

Given the size never gets over 3 ft for the whole 16 days, the “exposure” doesn’t really come into play, and the optimum SW direction never lines up with a decent swell. No standouts here, I’m afraid. It’s just not our time.

Stay patient, lads. It’ll come back around.

Rusty

Short Range Forecast

Mostly dry. Warm (max 20°C on Tue afternoon, min 14°C on Mon night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 7mm), mostly falling on Sat night. Warm (max 21°C on Thu afternoon, min 12°C on Fri night). Winds increasing (light winds from the WNW on Thu morning, fresh winds from the NE by Sat night).

Monday
6
Tuesday
7
Wednesday
8
Thursday
9
Friday
10
Saturday
11
Sunday
12
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)
0.5
SW
4
0.6
SSW
3
0.8
SSW
5
0.6
WNW
4
0.4
NW
4
0.1
S
12
0.3
SW
3
0.1
S
11
0.3
NW
3
0.3
NE
2
0.3
NNE
3
0.7
N
4
1.3
N
6
0.6
NNW
5
0.4
NE
5
0.9
NE
6
0.8
NE
5
1
NE
5
0.8
NE
5
Wave Graph
Metric surfscale
Energy kJ
9
7
33
12
4
3
0
0
1
3
1
0
0
0
0
0
0
0
0
0
0
Wind (km/h)
15
SSW
20
SSW
15
W
15
SW
20
SSW
15
SSW
5
WSW
10
SW
10
S
10
WNW
10
NNW
10
NE
15
NNE
20
N
30
N
30
NNE
30
NNE
30
ENE
20
ENE
20
ENE
30
ENE
Wind State
on
cross-on
cross-on
on
cross-on
cross-on
glassy
on
cross-on
cross
cross-off
off
off
cross-off
cross-off
cross-off
off
off
off
off
cross-off
High Tide
3:21PM4.72m
3:35AM5.04m
4:10PM4.65m
4:27AM4.93m
5:07PM4.59m
5:27AM4.83m
6:12PM4.58m
6:36AM4.79m
7:23PM4.67m
7:51AM4.85m
8:33PM4.86m
9:01AM5.02m
9:34PM5.14m
Low Tide
9:23PM1.62m
9:55AM1.33m
10:15PM1.72m
10:50AM1.43m
11:15PM1.80m
11:52AM1.51m
00:24AM1.81m
1:00PM1.53m
1:36AM1.68m
2:09PM1.44m
2:44AM1.43m
3:11PM1.28m
3:45AM1.10m
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
part cloud
clear
part cloud
part cloud
part cloud
part cloud
clear
rain showers
rain showers
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:58
5:00
5:00
5:01
5:03
5:03
5:05
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
9:45
9:45
9:45
9:44
9:43
9:43
9:42
 mm
1
6
Temp °C
17
18
18
17
20
19
19
20
20
19
21
21
21
21
14
16
19
18
21
22
24
Feels °C
15
15
17
14
18
17
19
20
19
18
20
20
19
19
9
12
16
13
20
20
20
Swell 1
Height (m)
Direction
Period (s)
0.4
NW
4
0.2
WNW
3
0.8
SSW
5
0.6
WNW
4
0.4
NW
4
0.1
S
12
0.1
S
11
0.2
WNW
3
1.3
N
6
0.6
NNW
5
0.3
NNW
5
0.5
NNE
5
Energy kJ
4
1
33
12
4
3
3
1
114
23
5
17
Swell 2
Height (m)
Direction
Period (s)
0.4
SW
4
0.1
S
11
0.4
NE
5
Energy kJ
5
3
6
Swell 3
Height (m)
Direction
Period (s)
0.1
NE
5
Energy kJ
1
Wind waves
Height (m)
Direction
Period (s)
0.5
SW
4
0.6
SSW
3
0.4
WNW
4
0.4
SSW
3
0.4
SW
3
0.3
SW
3
0.3
WNW
3
0.3
NW
3
0.3
NE
2
0.3
NNE
3
0.7
N
4
0.4
NE
5
0.9
NE
6
0.8
NE
5
1
NE
5
0.8
NE
5
Energy kJ
9
7
5
3
3
1
2
1
1
1
12
8
50
26
41
38
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Distance (km)
285
251
292
251
251
368
246
246
249
241
249
234
241
184
235
241
187
219
286
288
313
Best forecast wave conditions in Anglesy
Rating
(10 max)
Best forecast wave conditions in United Kingdom
Rating
(10 max)
1
1
1
1
2
2
2
1
1
2
1
2
1
1
1
1
1
1
1
1
1
Header Global
Rating
(10 max)
6
7
8
7
5
5
9
6
9
9
5
6
5
4
5
5
4
5
4
4
5
  • 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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