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 am 08 Aug 2026 (local time)

Forecast update in  hr  min

Today's Trearddur Bay (Holy Island) sea temperature is
16.8° C
1.2° 

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 8 Aug 2026:

  • Most powerful swell: Saturday 8 Aug, 10PM (local time) - 2ft (0.6m), 4s period, SW swell with 12 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 0.6m 4s and forecast to arrive on Saturday (Aug 08) at 10PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 3s period and expected on Friday (Aug 14) at 4AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful10PM (Sat 8th Aug)2ft (0.6m) 4s

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


The Lowdown

Right then, folks. Rusty here. Let’s be straight with you: the next couple of weeks for Trearddur Bay (Holy Island) are a real tale of woe. It’s a hard slog ahead, with barely a ripple worth getting wet for.

The outlook starts off flat and grim. The whole first week is a write-off. We’re looking at wave heights barely scraping 2 ft on Saturday the 8th, with onshore winds and a combined energy of just 12 – that’s barely a bump. Sunday the 9th goes glassy, sure, but the swell is a pathetic 0.3 ft, so it’s not surfable. The whole run from the 8th through to the 15th is a total blank, with poor surf conditions and combined energy figures that never get above 15. It’s a proper lull, and if you’re a beginner, you’d be wasting your time. This is all a long stretch of nothing.

Finally, we get a pulse of something on the 17th. Monday afternoon shows a bit of life with 4 ft swell from the SSW, but it’s cross-onshore, choppy, and the energy is still only 68. It’s still poor. Tuesday the 18th is the most interesting it gets, but it’s still not a winner. The morning brings a clean 6 ft cross-offshore wind from the NNW, and the swell direction is from the WSW. The combined energy jumps to 168 (moderate energy). That’s the biggest swell all period, but the period is a short 6 seconds, so it’s weak, lumpy, and will be a bit of a mess. The afternoon is similar at 5 ft, but cross-shore winds mess it up. For a break like Trearddur Bay, which is a beginner spot and inconsistent, 6 ft is on the bigger side for beginners, and the short period won’t do it any favours on the beach. It’s more of a messy, choppy session than a classic day.

The end of the run on the 21st and 22nd brings another burst of 5 ft to 6 ft swell, but it’s cursed with onshore or cross-shore winds, making it poor. The combined energy hits 215 on the 22nd afternoon, which is strong, but the wind is all over the place. Saturday the 22nd afternoon is the cleanest of that batch, with cross-offshore wind and 6 ft from the NW. That’s about as good as it gets, but it’s a long way off and the forecast is still a gamble.

The water temperature is about normal for the time of year, no major anomalies to report.

Look, if you’re desperate for a paddle, Tuesday the 18th morning is the only real contender, but manage expectations. For the rest, it’s a long wait. The setup here is more interesting for kite surfing than paddle surfing on those bigger days with the cross-shore winds. The forecasts can change, but right now, it’s a tough run.

Rusty.

Short Range Forecast

Mostly dry. Very mild (max 18°C on Sun afternoon, min 14°C on Fri night). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Warm (max 26°C on Wed afternoon, min 16°C on Mon night). Wind will be generally light.

Saturday
8
Sunday
9
Monday
10
Tuesday
11
Wednesday
12
Thursday
13
Friday
14
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
SSW
4
0.6
SSW
4
0.6
SW
4
0.1
S
12
0.1
SW
12
0.2
SSW
3
0.1
S
8
0.2
SSW
6
0.1
SW
7
0.1
SW
6
0.1
SW
6
0.1
S
11
0.5
S
4
0.4
SSW
4
0.1
SW
12
0.1
SW
10
0.1
SW
10
0.4
NW
3
0.4
NW
3
0.4
NW
3
0.1
SW
6
Wave Graph
Metric surfscale
Energy kJ
7
9
11
3
6
1
1
3
2
2
1
3
7
6
5
4
4
2
4
3
2
Wind (km/h)
20
S
20
SSW
20
SSW
5
SSW
15
SW
10
N
10
NNW
15
NNW
20
ENE
5
SSW
10
WSW
10
ESE
10
SSW
10
WSW
15
SSW
5
WSW
10
NW
10
NNW
20
NW
15
NW
15
NW
Wind State
cross-on
on
cross-on
glassy
on
cross-off
cross-off
cross-off
off
glassy
cross-on
cross-off
cross-on
cross-on
cross-on
cross-on
cross
cross-off
cross
cross
cross
High Tide
6:16AM4.64m
7:05PM4.57m
7:47AM4.68m
8:27PM4.80m
9:03AM4.91m
9:30PM5.16m
10:01AM5.19m
10:21PM5.51m
10:50AM5.42m
11:07PM5.78m
11:35AM5.56m
11:49PM5.94m
12:16PM5.58m
00:30AM5.96m
Low Tide
12:38PM1.85m
1:25AM1.83m
1:59PM1.77m
2:41AM1.51m
3:06PM1.52m
3:41AM1.10m
4:01PM1.21m
4:33AM0.72m
4:48PM0.94m
5:19AM0.45m
5:32PM0.74m
6:02AM0.32m
6:14PM0.67m
part cloud
clear
part cloud
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
part cloud
part cloud
part cloud
clear
clear
clear
part cloud
clear
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:45
5:47
5:48
5:50
5:52
5:54
5:54
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
9:00
8:59
8:57
8:54
8:52
8:51
8:49
 mm
Temp °C
16
17
16
17
18
16
15
16
18
21
23
23
23
26
22
19
22
20
15
18
17
Feels °C
12
13
12
16
16
15
13
12
14
18
21
21
20
24
20
19
21
20
12
16
14
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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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