Trearddur Bay (Holy Island) Surf Break

Lat Long: 53.28° N 4.62° W

Trearddur Bay (Holy Island) Surf Forecast and Surf Report

Issued: 12 pm 05 Aug 2026 (local time)

Forecast update in  hr  min

Today's Trearddur Bay (Holy Island) sea temperature is
16.8° C
1.4° 

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 5 Aug 2026:

  • Most powerful swell: Thursday 6 Aug, 4AM (local time) - 4.5ft (1.3m), 5s period, NW swell with 96 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 1.3m 5s and forecast to arrive on Thursday (Aug 06) at 4AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Thursday (Aug 06) at 10AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 4AM (Thu 6th Aug)4.5ft (1.3m) 5s

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


The Lowdown

Alright, Rusty here. Let’s talk about what’s going on with Trearddur Bay on Holy Island. Honestly, mate, the next couple of weeks are looking pretty grim for a proper surf. There’s a long, long dry spell with nothing worth getting wet for. The first real sniff of anything rideable doesn’t show up until Saturday the 15th, and even then it’s just barely passable. After that, it’s back to flatness or messy junk. It’s a tough stretch.

We start off on Wednesday the 5th of August with some strong westerly winds and a messy, lumpy 5ft swell, but the wind is cross-onshore and strong, so forget about any quality. The water’s 62°, which is a touch warmer than usual for this time of year. The combined swell energy is weak (117). The next several days are just a write-off – tiny waves, wrong wind directions, and poor conditions across the board. Thursday the 6th has a bit of swell in the morning but it’s only 1ft and choppy, and the afternoon goes glassy but flat.

By Friday the 7th, it’s practically a lake – 0.3ft swell with a super long 12-second period, but there’s nothing to ride. The wind is light cross-onshore in the morning, then goes onshore in the afternoon. Saturday the 8th sees a slight bump with a 3ft swell from the SSW, but it’s a short-period 4-second windswell, cross-onshore and choppy. Not worth the paddle.

Sunday the 9th is calm but flat, with a light onshore breeze. Monday the 10th and Tuesday the 11th are more of the same – tiny waves, cross-shore or cross-onshore wind. The combined energy drops to single digits or low teens. This pattern of flat, messy, or just plain small continues all the way through Thursday the 13th, when we get a little lift to 5ft on the afternoon, but it’s still cross-onshore and choppy. The energy is moderate (94).

Now, Saturday the 15th of August is the only day that even comes close to being surfable. In the afternoon, we get a 4ft swell from the SSW, but here’s the catch – the wind switches to a light cross-offshore from the northwest. That’s clean conditions for Trearddur Bay. The combined energy is moderate (87). It’s not a stand-out day by any means, but it’s the best of a bad lot. The swell is from the SSW, which isn’t the optimum SW direction, but with clean wind and a 5-second period, you might find a few lumpy but rideable waves. It’s still small enough for beginners, though the consistency is listed as inconsistent, and crowds are sometimes a factor there. This is your best bet, but don’t expect much.

Sunday the 16th has a similar size (4ft) and clean cross-offshore wind in the morning, but the combined energy is moderate (92). Still, the swell direction is SW with a 6-second period. It’s surfable but very ordinary. After that, we’re back to tiny, choppy, and cross-onshore junk right through to Thursday the 20th, with only 0.3ft to 2ft waves. The 20th has clean cross-offshore wind but only 0.3ft swell, so it’s flat as a pancake.

Bottom line: If you’re desperate, the afternoon of Saturday the 15th is your only real window, but keep expectations low. This stretch is a proper bust for any decent surf.

- Rusty

Short Range Forecast

Light rain (total 2mm), mostly falling on Wed afternoon. Very mild (max 16°C on Wed morning, min 13°C on Wed night). Winds decreasing (fresh winds from the W on Wed morning, light winds from the W by Thu night).

Days 4-6 Weather Summary

Mostly dry. Very mild (max 18°C on Sat afternoon, min 15°C on Sat morning). Wind will be generally light.

Wednesday
5
Thursday
6
Friday
7
Saturday
8
Sunday
9
Monday
10
Tuesday
11
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)
1.5
W
5
1.3
WSW
5
1.2
NW
5
0.4
SW
6
0.3
SW
6
0.7
SW
4
0.4
SW
4
0.1
S
12
0.9
SW
5
0.9
SSW
4
1
SSW
5
0.8
SW
5
0.4
SW
7
0.4
SW
7
0.3
SW
6
0.2
SSW
6
0.2
SSW
6
0.1
SW
6
0.1
S
11
0.1
SW
6
0.1
SW
11
Wave Graph
Metric surfscale
Energy kJ
117
102
76
9
6
18
6
3
32
23
44
29
16
11
6
4
3
1
2
1
5
Wind (km/h)
40
W
30
W
35
WNW
25
WNW
15
SW
20
S
10
W
15
SSW
25
S
25
S
25
SSW
15
S
10
SW
5
W
10
S
15
NW
10
NW
10
E
15
S
20
SSW
20
S
Wind State
cross-on
cross-on
cross
cross-on
on
cross-on
cross-on
on
cross-on
cross-on
cross-on
cross-on
on
cross-on
cross-on
cross
cross
cross-off
cross-on
cross-on
cross-on
High Tide
3:31PM4.87m
3:52AM5.04m
4:26PM4.70m
4:55AM4.80m
5:37PM4.56m
6:16AM4.64m
7:05PM4.57m
7:47AM4.68m
8:27PM4.80m
9:03AM4.91m
9:30PM5.16m
10:01AM5.19m
10:21PM5.51m
Low Tide
9:40PM1.55m
10:13AM1.46m
10:41PM1.77m
11:18AM1.72m
11:58PM1.91m
12:38PM1.85m
1:25AM1.83m
1:59PM1.77m
2:41AM1.51m
3:06PM1.52m
3:41AM1.10m
4:01PM1.21m
part cloud
rain showers
clear
part cloud
part cloud
part cloud
clear
clear
clear
part cloud
clear
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
part cloud
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:39
5:41
5:43
5:45
5:47
5:48
5:50
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
9:07
9:05
9:02
9:00
8:59
8:57
8:54
 mm
2
Temp °C
16
16
15
14
15
16
15
16
16
16
18
17
17
18
18
15
18
17
20
20
18
Feels °C
9
11
9
10
12
12
14
13
12
11
13
13
17
18
19
12
17
16
16
17
16
  • 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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