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 pm 04 Sep 2026 (local time)

Forecast update in  hr  min

Today's Trearddur Bay (Holy Island) sea temperature is
17.1°C
1.6° 

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 Sep 2026:

  • Most powerful swell: Tuesday 8 Sep, 10AM (local time) - 7ft (2.1m), 6s period, SW swell with 337 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 2.1m 6s and forecast to arrive on Tuesday (Sep 08) at 10AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Wednesday (Sep 09) at 1PM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful10AM (Tue 8th Sep)7ft (2.1m) 6s

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


The Lowdown

Right folks, Rusty here. Let’s be straight with you: the next 16 days look like a write-off for Trearddur Bay. I’ve looked at every bit of the forecast and there’s just nothing to get excited about. The whole period from now, right through to the 19th of September, is a total dud. You’ve got a gap of over two weeks with no surf worth mentioning.

We start off with a bit of swell on the 4th, but it’s a messy 5ft from the WSW with a short, weak 6-second period and a cross-on wind blowing at 18 mph. The water’s a touch warmer than usual at 63°F but the conditions are just poor. The energy in the water is weak anyway (127). It’s the same story day after day: a bit of height, but always cross-on or onshore wind, and the period is nearly always short. The 8th brings a 7ft swell from the SW, but with a 6-second period and a strong 25 mph cross-on wind, it’s a messy, blown-out mess. That’s not for anyone but experts, and even then, it’s not a surfer’s wave—it’s a kite surfer’s dream.

The 12th and 13th are flat. The 15th has a bit of a cleaner cross-off wind, but the swell is non-existent. Honestly, the whole run is a blank. Trearddur Bay is inconsistent at the best of times, and this is one of those times. The swell direction is from the SW, which is the optimum for the spot, but the wind is always wrong, and the energy is weak. There’s no standout day, no hidden gem. With the conditions as they are, this setup is much more interesting for kite surfing than paddle surfing for the first week. After that, it’s flat. Don’t hold your breath—forecasts can change, but right now, this is a long, hard wait.

Rusty.

Short Range Forecast

Light rain (total 7mm), mostly falling on Sat night. Very mild (max 19°C on Sun afternoon, min 13°C on Fri night). Winds increasing (light winds from the SW on Sat morning, strong winds from the S by Sun morning).

Days 5-7 Weather Summary

Moderate rain (total 14mm), heaviest on Thu morning. Very mild (max 16°C on Wed afternoon, min 13°C on Mon night). Winds decreasing (strong winds from the WSW on Tue morning, light winds from the WSW by Wed night).

Fri
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
Wednesday
9
Thursday
10
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
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
WSW
6
1.5
W
5
1.1
W
5
0.6
SW
6
0.9
SSW
4
1.2
SSW
5
1.5
SSW
6
1.4
SW
6
0.4
SW
14
1.8
SW
6
1.7
SW
6
2.1
SW
6
1.7
WSW
6
2
W
6
1.8
NW
6
0.6
SW
6
0.7
W
4
1.5
SW
6
1.2
SW
6
0.9
SW
7
Wave Graph
Metric surfscale
Energy kJ
119
115
59
25
28
70
129
137
51
195
182
337
216
274
221
23
15
131
109
65
Wind (km/h)
30
WSW
35
W
20
WSW
25
SSW
35
S
30
S
35
SSW
25
WSW
30
SW
40
SW
35
WSW
40
WSW
35
W
40
WNW
35
WNW
20
W
15
WSW
35
SW
30
SW
30
WSW
Wind State
cross-on
cross-on
cross-on
on
cross-on
cross-on
cross-on
on
on
on
on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
on
on
cross-on
High Tide
4:41AM4.69m
5:21PM4.55m
6:18AM4.51m
7:01PM4.59m
7:54AM4.65m
8:23PM4.91m
9:02AM4.96m
9:21PM5.29m
9:53AM5.26m
10:08PM5.63m
10:36AM5.47m
10:49PM5.85m
Low Tide
10:23PM1.82m
10:59AM2.01m
11:50PM1.99m
12:31PM2.14m
1:25AM1.84m
1:57PM1.96m
2:38AM1.44m
3:00PM1.61m
3:33AM1.02m
3:50PM1.24m
4:19AM0.68m
4:32PM0.95m
part cloud
clear
clear
part cloud
rain showers
part cloud
part cloud
part cloud
cloud
light rain
clear
rain showers
cloud
clear
clear
part cloud
light rain
mod rain
rain showers
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:33
6:35
6:37
6:39
6:39
6:41
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:01
7:59
7:57
7:53
7:52
7:50
7:46
 mm
7
2
1
1
10
1
Temp °C
17
15
14
14
15
18
19
17
15
15
15
15
15
14
14
16
15
16
18
17
Feels °C
11
8
11
10
10
10
13
13
9
8
9
7
8
6
7
11
10
12
15
12
  • 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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