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 27 Aug 2026 (local time)

Forecast update in  hr  min

Today's Trearddur Bay (Holy Island) sea temperature is
17.1°C
1.5° 

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 27 Aug 2026:

  • Best quality surf: Saturday 29 Aug, 10AM (local time) - 3.5ft (1.0m), 6s period, SSW swell with offshore winds.
  • Most powerful swell: Thursday 3 Sep, 7AM (local time) - 6ft (1.9m), 6s period, SW swell with 284 kJ wave energy.
  • Next surfable swell (1★+): Saturday 29 Aug, 10AM (local time) - 3.5ft (1.0m), 6s period with SSW swell.

Best Forecast Surf Conditions for Trearddur Bay (Holy Island) this week:

The surf forecast for Trearddur Bay (Holy Island) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Aug 29) at 10AM. The primary swell is predicted to be 1.0m and 6s period with a secondary swell of 0.7m and 4s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Trearddur Bay (Holy Island) in the next 16 days are 1.9m 6s and forecast to arrive on Thursday (Sep 03) at 7AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Saturday (Aug 29) at 10PM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)10AM (Sat 29th Aug)3.5ft (1.0m) 6s
Best Surf10AM (Sat 29th Aug)3.5ft (1.0m) 6s
Most Powerful 7AM (Thu 3rd Sep)6ft (1.9m) 6s

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


The Lowdown

Alright, grab a coffee, surfers, and let's get into it. Rusty here.

First thing to say, for the next week we are looking at a bit of a flat spell with some real howling winds. The water temp at Trearddur Bay (Holy Island) is sitting at 63°, which is a touch warmer than normal for this time of year, so that’s a nice little bonus if you are brave enough to get changed.

The next few days are pretty grim. Thursday afternoon's tiny 0.7ft SSW swell gets ruined by a bit of rain. Friday is a write-off with strong onshore winds. The only real flicker of hope comes on Saturday morning, the 29th, with a clean, offshore ENE breeze at 15 mph and a 3ft SSW swell, but the period is a short 6 seconds, so it’s going to be weak and a bit messy. It's surfable but very ordinary. Meanwhile, on Saturday afternoon, the wind swings onshore again, so make the most of the morning.

The rest of the weekend and the start of the week is a washout with onshore winds from the south and west. The swell tries to bump up on Tuesday, 1st September, but the wind is crap. You’ll be staring at a 4ft swell with a pitiful 5-second period on Tuesday afternoon, but it’s cross-onshore and choppy. Not worth a paddle.

We hit a bit of a gap here with no real quality windows. The only real event is a spike of moderate energy on Thursday the 3rd morning, but the wind is a strong 28 mph cross-onshore, making it a total mess. That setup is more interesting for kite surfing than paddle surfing, if you ask me.

Things finally start to look a little more promising as we head into the second week. On the 7th of September, the swell energy picks up, but wind is still a problem. The best window in the whole 16-day run looks like it will be the morning of Tuesday, the 8th of September. We get an offshore ENE wind at 12 mph, with a 4ft SSW swell. It’s clean. It’s not a classic, but it’s the best on offer.

Then we get a bit of a teaser. On the 11th of September, the swell jumps again to 7ft from the SSW, with a cross-offshore NNW wind, and the energy is strong. But the files say it’s still poor surf conditions, likely because the swell is a bit disorganised. Still, it’s a clean, offshore wind and a solid 7ft, so if you are an expert, keep an eye on that Friday morning. The swell will be too big for beginners, sitting over 5ft.

So, the bottom line: there is no standout epic swell here. The best you can hope for is a clean, small session on the morning of Tuesday the 8th of September at Trearddur Bay. It’s inconsistent, so don’t expect a perfect day, but it’s the only decent clean window in the whole 16 days. The rest of the time you’ll be battling the wind.

Rusty.

Short Range Forecast

Heavy rain (total 22mm), heaviest during Sat morning. Very mild (max 18°C on Sat afternoon, min 15°C on Sat night). Winds increasing (calm on Thu night, fresh winds from the NW by Sat night).

Days 5-7 Weather Summary

Light rain (total 2mm), mostly falling on Sun afternoon. Very mild (max 17°C on Mon night, min 13°C on Tue night). Winds decreasing (fresh winds from the WNW on Mon morning, light winds from the NW by Tue night).

Thu
27
Friday
28
Saturday
29
Sunday
30
Monday
31
Tuesday
1
Wednesday
2
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
1
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)
0.2
SSW
7
0.3
SSW
7
0.4
SSW
6
0.5
SSW
6
1
SSW
6
1
SSW
6
0.9
SSW
6
1
SW
9
0.6
SSW
8
0.5
SW
8
0.8
SSW
7
0.7
SW
7
0.6
SSW
7
0.9
WSW
4
0.9
WSW
4
1.1
SW
5
0.6
SSW
6
0.4
SW
6
0.1
SW
16
1.4
SW
5
Wave Graph
Metric surfscale
Energy kJ
4
9
16
23
77
75
60
155
47
31
61
53
36
21
36
53
22
8
10
94
Wind (km/h)
5
ENE
5
S
25
WNW
15
WSW
25
SSW
25
ENE
25
S
20
WNW
25
S
30
SW
15
SSW
30
WNW
10
WSW
25
SW
25
W
15
W
20
WNW
10
WNW
15
SSW
35
SSW
Wind State
cross-off
glassy
cross-on
on
on
off
cross-on
cross-on
cross-on
on
cross-on
cross
cross-on
on
cross-on
cross-on
cross
cross
cross-on
cross-on
High Tide
11:04PM5.51m
11:27AM5.23m
11:36PM5.65m
11:57AM5.33m
00:07AM5.72m
12:28PM5.40m
00:40AM5.74m
1:01PM5.41m
1:15AM5.69m
1:36PM5.36m
1:53AM5.56m
2:15PM5.23m
2:36AM5.34m
Low Tide
4:52PM1.28m
5:14AM0.96m
5:23PM1.07m
5:44AM0.80m
5:55PM0.94m
6:16AM0.70m
6:28PM0.87m
6:50AM0.69m
7:04PM0.89m
7:26AM0.78m
7:42PM1.01m
8:06AM0.98m
8:25PM1.22m
mod rain
light rain
rain showers
clear
rain showers
rain showers
part cloud
clear
part cloud
rain showers
clear
part cloud
cloud
part cloud
part cloud
part cloud
part cloud
clear
part cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:20
6:20
6:22
6:24
6:26
6:28
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:20
8:17
8:15
8:13
8:10
8:08
8:06
 mm
6
2
2
1
11
2
Temp °C
17
17
16
17
17
17
18
15
17
16
16
15
16
17
15
16
16
13
16
16
Feels °C
18
16
13
16
14
13
15
10
13
12
14
10
12
13
11
14
14
11
12
12
  • Map Icons:
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  • 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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