Trearddur Bay (Holy Island) Surf Break

Trearddur Bay (Holy Island) Surf Forecast and Surf Report

Lat Long: 53.28° N 4.62° W

Issued: 12 am 04 Jul 2026 (local time)

Forecast update in  hr  min

Today's Trearddur Bay (Holy Island) sea temperature is
15.6° C

1.4°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 4 Jul 2026:

  • Most powerful swell: Saturday 4 Jul, 4PM (local time) - 3.5ft (1.1m), 5s period, SW swell with 65 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 1.1m 5s and forecast to arrive on Saturday (Jul 04) 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 1.1m 5s period and expected on Saturday (Jul 11) at 4AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 4PM (Sat 4th Jul)3.5ft (1.1m) 5s

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


Updates in  hr  min  s Forecast update imminent

Alright, let's talk about Trearddur Bay on Holy Island.

To be honest, the next couple of weeks are a bit of a bust. There’s just no meaningful swell on the cards, and when there is a tiny bit, the wind ruins it. This happens here sometimes, so don’t get too down about it.

The first few days are a write-off. Saturday the 4th has a 3ft SW windswell, but it’s got a terrible 5-second period and a nasty 19 mph onshore wind. The energy reading is a weak 46, so it’s all chop and no shape. Sunday the 5th and Monday the 6th are even smaller, dropping to 2ft with more onshore wind. Just leave it.

The swell vanishes entirely from the 7th right through to the 14th. You’ll see some nice offshore winds here and there, keeping the water glassy, but with no waves, there’s nothing to ride. That’s a solid week of flat calm.

The only tiny flicker of hope is Tuesday afternoon the 14th. A tiny 0.3ft swell from the SW, with a very long 18-second period, drifts in. The energy is only 14, so it’s weak, but the cross-offshore wind will keep it clean. It’s just too small to surf. Later, on Thursday the 16th afternoon, you get a really glassy surface with a similar tiny bit of swell. That’s as good as it gets, and it’s still just a ripple.

No spot stands out here. The main problem is a total lack of swell. My advice is to wait for the next forecast.

Rusty

Short Range Forecast

Mostly dry. Warm (max 20°C on Sat afternoon, min 15°C on Fri night). Mainly fresh winds.

Days 4-6 Weather Summary

Mostly dry. Warm (max 24°C on Thu afternoon, min 15°C on Mon night). Wind will be generally light.

Saturday
4
Sunday
5
Monday
6
Tuesday
7
Wednesday
8
Thursday
9
Friday
10
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
SW
5
1.1
SW
5
0.9
WSW
5
0.6
SW
6
0.6
SW
4
0.4
SSW
4
0.5
SW
5
0.6
SSW
3
0.7
WSW
4
0.5
NW
4
0.4
SW
3
0.4
SW
4
0.4
NW
4
0.2
WNW
3
0.1
SW
4
0.1
S
11
1
N
4
Wave Graph
Metric surfscale
Energy kJ
41
65
37
20
10
6
12
8
16
8
2
3
3
1
1
3
0
0
0
0
0
Wind (km/h)
30
SW
25
SW
20
W
20
SW
20
SSW
15
SW
10
SW
20
SSW
15
WSW
15
SW
20
SSW
10
SSW
5
W
5
W
5
E
10
ENE
10
NE
20
ENE
10
ENE
10
NNE
20
E
Wind State
on
on
cross-on
on
on
on
on
on
on
on
cross-on
cross-on
cross-on
cross-on
cross-off
off
off
off
off
off
cross-off
High Tide
2:00PM4.84m
2:11AM5.22m
2:38PM4.79m
2:50AM5.14m
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
Low Tide
7:47AM1.17m
7:58PM1.45m
8:25AM1.20m
8:38PM1.52m
9:07AM1.25m
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
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
part cloud
cloud
clear
clear
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:56
4:58
4:58
5:00
5:00
5:01
5:03
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
9:46
9:46
9:45
9:45
9:45
9:44
9:43
 mm
Temp °C
19
20
19
18
20
19
17
19
20
18
20
20
19
20
21
23
24
23
28
27
26
Feels °C
14
16
16
16
17
17
15
16
19
15
18
18
18
19
21
22
23
19
28
26
20
Swell 1
Height (m)
Direction
Period (s)
0.4
NW
4
0.4
NW
4
0.2
WNW
4
0.4
SSW
4
0.4
NW
4
0.5
NW
4
0.3
NW
4
0.4
SW
4
0.2
SSW
4
0.2
WNW
3
0.1
SW
4
0.1
S
11
Energy kJ
5
3
1
6
3
8
2
3
1
1
1
3
Swell 2
Height (m)
Direction
Period (s)
0.3
NW
4
0.1
NW
4
0.4
SW
4
Energy kJ
3
1
5
Swell 3
Height (m)
Direction
Period (s)
0.1
S
12
Energy kJ
3
Wind waves
Height (m)
Direction
Period (s)
1
SW
5
1.1
SW
5
0.9
WSW
5
0.6
SW
6
0.6
SW
4
0.4
NW
4
0.5
SW
5
0.6
SSW
3
0.7
WSW
4
0.4
SW
3
0.4
NW
4
1
N
4
Energy kJ
41
65
37
20
10
4
12
8
16
2
3
39
Nearest Offshore or Glassy
Rating
(10 max)
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
Distance (km)
192
548
192
251
305
292
251
347
323
236
368
246
246
249
246
249
252
249
275
288
155
Best forecast wave conditions in Anglesy
Rating
(10 max)
Best forecast wave conditions in United Kingdom
Rating
(10 max)
3
2
2
2
1
1
2
1
3
3
1
1
2
2
1
1
1
1
1
1
Header Global
Rating
(10 max)
5
5
5
9
7
7
5
8
7
5
6
9
8
9
8
5
5
5
4
9
9
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder
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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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