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Surf Forecasts:

Trearddur Bay (Holy Island) surfForecast / Wales – Anglesy / UK

information circle12 Day Weather and Surf, issued 5 pm Monday 24 Nov 2025 GMT
Forecast update in hr  min  s Forecast update imminent
Trearddur Bay (Holy Island) surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Trearddur Bay (Holy Island) sea temperature is
12.2° C
 (Which is slightly warmer than usual)

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

The most powerful waves expected at Trearddur Bay (Holy Island) in the next 12 days are 3.0m 8s and forecast to arrive on Monday (Dec 01) at 12PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 6s period and expected on Monday (Nov 24) at 9PM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful12PM (Mon 1st Dec)10ft (3.0m) 8s

Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 12 days.

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast Light rain (total 8mm), mostly falling on Thu morning. Very mild (max 13°C on Wed night, min 8°C on Tue afternoon). Winds increasing (calm on Tue night, near gales from the S by Wed afternoon).

Days 3-6 Weather Summary Moderate rain (total 13mm), heaviest on Fri night. Very mild (max 13°C on Thu afternoon, min 9°C on Fri morning). Winds decreasing (near gales from the SSW on Fri night, light winds from the NW by Sun morning).

Mon
24
Tuesday
25
Wednesday
26
Thursday
27
Friday
28
Saturday
29
Sunday
30
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
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
See all maps
Wave Height (m) & direction (?)
0.3
SW
0.1
SW
0.1
SW
0.1
SW
0.1
SW
1.1
SSW
2.1
SSW
1
SW
1.8
SSW
2.1
SW
1.7
WSW
2.2
SW
2.5
SW
1.9
WSW
1.2
SSW
1.4
SSW
0.7
SW
0.4
SW
0.3
SW
0.4
SSW
2.5
SSW
Period(s) (?)88121284776766866889927
Wave
Graph
(?)Metric surfscale
Energy kJ (?)1026634539291246370184390694270962517423122575
Wind
(km/h)
40
N
30
N
25
NNE
15
N
10
S
40
S
50
S
20
SSW
40
SSW
45
SW
40
WSW
60
SW
40
WSW
50
WSW
30
WSW
25
WSW
25
WNW
20
NNW
10
WNW
40
SSW
40
SW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		cross-
off		cross-
off		cross-
off		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		onononononcross-
on		cross-
on		crosscross-
off		cross-
on		onon
High Tide
/ height (m)
12:44AM
4.84
1:01PM
5.13
1:29AM
4.68
1:47PM
4.98
2:23AM
4.53
2:41PM
4.86
3:26AM
4.45
3:45PM
4.81
4:36AM
4.48
4:52PM
4.86
5:44AM
4.64
5:58PM
5.03
6:45AM
4.88
Low Tide
/ height (m)
6:34PM
1.65
6:46AM
1.88
7:17PM
1.77
7:30AM
2.06
8:07PM
1.88
8:24AM
2.20
9:06PM
1.93
9:28AM
2.28
10:12PM
1.88
10:37AM
2.22
11:19PM
1.72
11:45AM
2.03
12:21AM
1.47
Mon
24
Tuesday
25
Wednesday
26
Thursday
27
Friday
28
Saturday
29
Sunday
30
Sunrise--7:58--8:00--8:03--8:03--8:06--8:07--8:08
Sunset4:10--4:09--4:08--4:07--4:07--4:06--4:05--
part cloud
rain showers
rain showers
clear
part cloud
light rain
light rain
light rain
light rain
rain showers
clear
light rain
cloud
rain showers
clear
rain showers
rain showers
clear
clear
light rain
heavy rain
Rain (mm)
-11--11131-2-8-11--411
Temp. °C10999999131313111111119910991112
Feels °C (?)112520-27652-12-12243524
  • 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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View detailed surf forecast for Trearddur Bay (Holy Island) at:
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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 12 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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