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 pm 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: Monday 6 Jul, 10PM (local time) - 2.5ft (0.7m), 5s period, SW swell with 23 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 0.7m 5s and forecast to arrive on Monday (Jul 06) at 10PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Saturday (Jul 11) at 7AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful10PM (Mon 6th Jul)2.5ft (0.7m) 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, grab a coffee, mate, and let’s have a proper look at what’s on the cards for Trearddur Bay (Holy Island) over the next couple of weeks.

Honestly, the first week’s a write-off. We’re looking at a long stretch of flat or near-flat conditions from July 6th right through until July 16th. For most of that time, the energy’s just not there, and when there is a tiny bit of swell, the wind’s mostly on it or cross-on, making a mess of things. It’s frustrating, but it happens. The water temp on the morning of the 6th is sitting at 59.5°, which is about what you'd expect for this time of year.

There’s a glimmer of hope on July 17th. Friday morning sees a bump of 3 ft swell from the SSW, period of 6 seconds, with a moderate offshore wind (16 mph) from the NE. The combined energy is still weak (80), but it’s the first time we see the word “surfable”. It’s very ordinary, but it’s a start. Friday afternoon stays clean with cross-off winds, holding around 3.3 ft, but still nothing to write home about. Saturday the 18th and Sunday the 19th stay similar in size – 3.3 ft and 1.6 ft – but clean with cross-off breezes. The energy is weak, though.

Now, the real talking point is the start of the third week. Monday July 20th morning brings a push of 4.6 ft swell from the SW, with a period of 7 seconds, and clean conditions thanks to a light offshore from the N. The combined energy bumps up to a moderate 171. Tuesday July 21st morning holds similar, with 4.9 ft from the SW, period of 6 seconds, and light offshore winds (6 mph) from the NNW, with a combined energy of 143. The conditions will be clean and the size is there, but the period is short, so it won’t have that grunt you’d want for a proper session. For a beginner spot, 4.9 ft is starting to push the limits for less experienced paddlers.

If I had to pick the standout, it’d be Monday July 20th morning. That’s the best on offer. The swell size (4.6 ft) is solid, the wind is light and cross-off, and the break is fairly exposed to that SW swell direction. It’s still a short-period affair, so don’t expect a long wall, but it’s the cleanest bit of size we’ve got. Crowds are “sometimes” an issue here, so you might get a few others with the same idea.

The rest of that week stays surfable but ordinary. Don't get your hopes up too much for long-range gold, but at least we’re not totally flat.

Stay keen, mate.

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

Mostly dry. Warm (max 22°C on Fri morning, min 17°C on Thu morning). Winds increasing (light winds from the NNE on Thu afternoon, 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
0.7
SW
4
0.7
SSW
5
0.6
WNW
4
0.4
NW
4
0.1
S
12
0.1
S
11
0.1
S
11
0.2
NNW
3
0.3
NE
2
0.3
NNE
2
0.8
N
4
1.6
N
6
1.4
N
6
0.9
NE
5
0.1
SE
4
0.8
NE
5
0.6
NE
5
Wave Graph
Metric surfscale
Energy kJ
9
13
22
12
4
3
0
0
2
3
0
0
0
0
0
0
0
0
1
0
0
Wind (km/h)
15
SSW
20
SSW
10
W
15
WSW
15
SSW
15
SSW
10
WSW
10
SW
15
SSW
10
NW
10
NNW
10
NE
20
NE
20
N
20
N
25
N
25
N
25
NE
20
ENE
25
NE
30
ENE
Wind State
on
on
cross-on
on
cross-on
cross-on
cross-on
on
cross-on
cross
cross-off
off
off
cross-off
cross-off
cross-off
cross-off
off
off
off
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
part cloud
clear
part cloud
part cloud
part cloud
clear
clear
clear
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
Temp °C
16
18
18
17
20
19
19
20
20
19
21
20
22
22
22
19
21
21
21
21
21
Feels °C
14
15
17
15
17
17
19
20
19
18
20
19
20
19
20
17
19
17
19
17
14
Swell 1
Height (m)
Direction
Period (s)
0.4
NW
4
0.7
SSW
5
0.6
WNW
4
0.4
NW
4
0.1
S
12
0.6
N
5
0.4
N
5
Energy kJ
4
22
12
4
3
19
8
Swell 2
Height (m)
Direction
Period (s)
0.4
SW
4
0.1
S
11
0.1
S
11
0.1
SE
4
Energy kJ
5
2
3
1
Swell 3
Height (m)
Direction
Period (s)
0.1
S
12
Energy kJ
3
Wind waves
Height (m)
Direction
Period (s)
0.5
SW
4
0.7
SW
4
0.4
WNW
4
0.4
SW
3
0.4
SW
3
0.3
SW
3
0.2
WNW
3
0.2
NNW
3
0.3
NE
2
0.3
NNE
2
0.8
N
4
1.6
N
6
1.4
N
6
0.9
NE
5
0.5
NE
5
0.8
NE
5
0.6
NE
5
Energy kJ
9
13
6
2
3
1
1
1
1
1
20
200
141
31
12
29
16
Nearest Offshore or Glassy
Rating
(10 max)
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Distance (km)
292
251
285
235
368
246
246
284
246
246
234
241
184
187
241
267
288
246
286
288
314
Best forecast wave conditions in Anglesy
Rating
(10 max)
Best forecast wave conditions in United Kingdom
Rating
(10 max)
1
1
2
2
2
1
1
2
2
2
2
1
1
1
1
1
1
1
1
1
1
Header Global
Rating
(10 max)
8
7
5
5
9
8
9
9
5
6
6
5
8
6
5
5
5
9
9
7
4
  • 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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