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Surf Forecasts:

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

information circle12 Day Weather and Surf, issued 11 am Thursday 20 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
12.7° C
 (Which is 1.1°C warmer than normal for this time of year)

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 4.0m 8s and forecast to arrive on Sunday (Nov 23) 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 3.5m 8s period and expected on Monday (Nov 24) at 9AM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful12PM (Sun 23rd Nov)13ft (4.0m) 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 Heavy rain (total 23mm), heaviest during Fri night. Very mild (max 12°C on Sat night, min 6°C on Thu morning). Winds increasing (light winds from the N on Thu night, near gales from the SSW by Sat night).

Days 3-6 Weather Summary Moderate rain (total 10mm), heaviest on Sun night. Mild temperatures (max 9°C on Sun morning, min 8°C on Sun afternoon). Winds decreasing (gales from the W on Sun afternoon, light winds from the N by Tue night).

Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
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 (?)
1.8
NNW
1.7
NNW
0.1
S
0.2
WNW
0.7
WSW
2
SSW
1.1
SSW
1.1
WSW
3
SSW
3.5
WSW
4
WNW
3
NW
0.3
SW
0.1
SW
0.1
SW
0.1
W
0.1
SW
0.1
W
0.1
W
0.3
W
0.6
SW
Period(s) (?)6612336777888988111112834
Wave
Graph
(?)Metric surfscale
Energy kJ (?)00311028910711074213781914115212332531210
Wind
(km/h)
30
N
30
N
20
N
10
WNW
30
SW
50
SSW
25
WNW
25
SW
55
SSW
55
WSW
70
W
45
NNW
50
N
45
N
40
N
35
NNE
30
N
10
N
20
WSW
35
SW
45
SW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		cross-
off		cross-
off		crossononcross-
on		oncross-
on		cross-
on		cross-
on		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		ononon
High Tide
/ height (m)
10:06AM
5.38
10:21PM
5.27
10:38AM
5.43
10:54PM
5.23
11:10AM
5.42
11:29PM
5.13
11:45AM
5.37
12:05AM
5.00
12:21PM
5.26
12:44AM
4.84
1:01PM
5.13
1:29AM
4.68
1:47PM
4.98
2:23AM
4.53
Low Tide
/ height (m)
4:11PM
1.38
4:27AM
1.34
4:45PM
1.38
4:59AM
1.42
5:19PM
1.44
5:32AM
1.55
5:55PM
1.53
6:08AM
1.71
6:34PM
1.65
6:46AM
1.88
7:17PM
1.77
7:30AM
2.06
8:07PM
1.88
Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
Sunrise7:50--7:52--7:54--7:56--7:58--7:58--8:00--
Sunset-4:15--4:14--4:13--4:12--4:10--4:09--4:08-
rain showers
rain showers
clear
part cloud
part cloud
rain showers
part cloud
rain showers
rain showers
cloud
light rain
rain showers
cloud
part cloud
rain showers
part cloud
clear
part cloud
cloud
part cloud
light rain
Rain (mm)
21---9-110-45--1-----3
Temp. °C777781110111298999998991011
Feels °C (?)-2-20304451-3-7-1-3-2-1006324
  • 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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