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 30 Aug 2026 (local time)

Forecast update in  hr  min

Today's Trearddur Bay (Holy Island) sea temperature is
17.3°C
1.7° 

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 30 Aug 2026:

  • Most powerful swell: Wednesday 2 Sep, 10PM (local time) - 7ft (2.2m), 7s period, SW swell with 460 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 2.2m 7s and forecast to arrive on Wednesday (Sep 02) 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 0.6m 5s period and expected on Saturday (Sep 05) at 4PM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful10PM (Wed 2nd Sep)7ft (2.2m) 7s

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


The Lowdown

Alright folks, Rusty here, and I’ve been staring at the charts for the next couple of weeks around Trearddur Bay (Holy Island). I’ll be straight with you—this is a tough one. The forecast is a long, dry spell with almost nothing to get excited about for the first eleven days. We’re looking at a whole lot of small, weak, and messy conditions, with a lot of onshore and cross-onshore wind. The water temp is sitting at 63°F, which is a touch warmer than normal for this time of year, but that’s about the only thing that’s slightly above average.

From Sunday the 30th of August right through to the 10th of September, it’s a total write-off. The surf is consistently poor, with small, weak swells and lumpy, choppy conditions. The combined energy is mostly in the low double-digits or low triple-digits at best, with the highest early on being 157 (weak to moderate) on Sunday morning, but it’s paired with a cross-on wind and a poor surf rating. The wind is often onshore, and the swell period is short, with a lot of 4 to 6-second stuff. Honestly, there’s nothing here for a surfer. It’s a grim stretch.

Then, on Thursday the 10th of September, something finally shows a pulse. The morning sees a modest 7ft swell from the SSW, with a period of 6 seconds, and the combined energy jumps to 329 (moderate). The wind is a light breeze from the southeast, crossing the swell, and conditions are described as marginal. But the real standout is Thursday afternoon. The wind drops to calm, becoming glassy, and the swell holds at 7ft from the SSW with 6-second period, and the energy reads 312 (moderate). The guidance says “expect good surf conditions.” This is our best window. It’s a short period swell, so it won’t have the grunt of a groundswell, but when it’s glassy and clean at Trearddur Bay, it can still be fun. The swell direction is SSW, which is close to the optimum SW direction for this spot, so it should wrap in reasonably well. Keep in mind the crowds are sometimes an issue here, so if you can get out that afternoon, you’ll have the best chance of a clean wave.

After that, things drop off again. Friday the 11th has a smaller 4ft SSW swell, but the wind swings to cross-off in the morning, which is clean, but the energy is only 124 (weak), so it’s small. The rest of the outlook fades away into tiny, weak waves with onshore wind, and by the 13th and 14th of September, we’re down to 0.3ft or 0.7ft swells. It’s a dead end.

So, to wrap it up: there’s a massive gap of no surf from now until the 10th of September. The only real standout is that Thursday afternoon glassy session with a 7ft SSW swell. It’s not a big, powerful swell, but it’s the only clean, rideable wave in the whole 16-day window. Get on it if you can.

Rusty.

Short Range Forecast

Moderate rain (total 10mm), heaviest on Sun afternoon. Very mild (max 17°C on Tue afternoon, min 15°C on Sun night). Mainly fresh winds.

Days 5-7 Weather Summary

Moderate rain (total 12mm), heaviest on Thu night. Very mild (max 18°C on Fri afternoon, min 12°C on Fri night). Mainly strong winds.

Sun
30
Monday
31
Tuesday
1
Wednesday
2
Thursday
3
Friday
4
Saturday
5
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)
1.1
SSW
5
1.1
SW
7
1.3
WNW
5
0.6
SW
8
0.4
SSW
7
0.8
WSW
4
1.2
SSW
5
1.4
SW
6
2
SSW
6
1.5
SSW
6
1.9
SW
7
1.6
SW
6
1.3
SW
5
1.4
SW
6
1.6
SW
7
1.6
SW
6
1.4
WNW
5
1.2
NW
5
0.4
SW
6
0.4
SW
4
Wave Graph
Metric surfscale
Energy kJ
50
119
87
50
21
18
61
110
322
170
335
163
87
149
234
171
102
80
13
5
Wind (km/h)
35
S
15
WSW
35
WNW
25
WNW
20
WSW
25
SW
30
SSW
15
SW
35
SSW
35
SSW
30
SW
30
WSW
25
SW
35
NNW
40
WSW
35
W
40
WNW
30
WNW
20
WSW
15
SW
Wind State
cross-on
on
cross
cross-on
on
on
on
on
on
on
on
on
on
cross-off
cross-on
cross-on
cross
cross
cross-on
on
High Tide
00:40AM5.74m
1:01PM5.41m
1:15AM5.69m
1:36PM5.36m
1:53AM5.56m
2:15PM5.23m
2:36AM5.34m
3:01PM5.01m
3:30AM5.02m
3:59PM4.75m
4:41AM4.69m
5:21PM4.55m
Low Tide
6:28PM0.87m
6:50AM0.69m
7:04PM0.89m
7:26AM0.78m
7:42PM1.01m
8:06AM0.98m
8:25PM1.22m
8:51AM1.28m
9:16PM1.51m
9:47AM1.66m
10:23PM1.82m
10:59AM2.01m
11:50PM1.99m
thunderstorm
part cloud
part cloud
cloud
part cloud
clear
rain showers
light rain
rain showers
part cloud
part cloud
cloud
light rain
mod rain
part cloud
clear
clear
clear
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:24
6:26
6:28
6:30
6:31
6:33
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:13
8:10
8:08
8:06
8:04
8:01
7:59
 mm
4
1
4
1
3
9
Temp °C
16
16
15
16
16
15
17
17
17
17
17
16
17
16
15
18
15
14
15
16
Feels °C
11
13
9
13
13
10
12
14
13
12
13
12
13
10
8
12
8
9
11
13
  • 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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