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

information circle12 Day Weather and Surf, issued 5 am Sunday 07 Dec 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
11.0° C
(Which is slightly warmer than usual)


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

The surf forecast for Trearddur Bay (Holy Island) over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Dec 09) at 9PM. The primary swell is predicted to be 4.0m and 10s period. The wind is predicted to be onshore as the swell arrives.

The most powerful waves expected at Trearddur Bay (Holy Island) in the next 12 days are 5.0m 11s and forecast to arrive on Tuesday (Dec 09) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Tue 9th Dec)13ft (4.0m) 10s
Best Surf 9PM (Tue 9th Dec)13ft (4.0m) 10s
Most Powerful 3PM (Tue 9th Dec)16ft (5.0m) 11s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Heavy rain (total 43mm), heaviest during Mon night. Very mild (max 14°C on Tue morning, min 10°C on Mon night). Mainly gales.

Days 3-6 Weather Summary Light rain (total 7mm), mostly falling on Fri night. Very mild (max 11°C on Wed morning, min 7°C on Fri night). Mainly near gales.

Sunday
07
Monday
08
Tuesday
09
Wednesday
10
Thursday
11
Friday
12
Saturday
13
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
1.3
SSW
2.1
SW
2.4
SW
2.5
SW
2.1
SW
1.8
SSW
3.5
SSW
5
SSW
3
SSW
2.5
SW
2.3
SW
2
SW
2.3
SSW
2.4
SSW
2.1
SSW
2.2
S
2.2
SW
3
SW
3
SW
3.5
SSW
2.3
SW
Period(s) (?)9777107811121312677777810711
Wave
Graph
(?)Metric surfscale
Energy kJ (?)24940450568588330616065363229921661539260493577419440487866189811211197
Wind
(km/h)
20
ESE
35
W
45
SSW
40
SW
40
SSW
25
SSE
65
S
65
SSW
30
NW
40
WSW
35
WSW
40
SW
50
S
45
S
40
SSE
50
SSE
30
SSW
50
SSW
40
SW
25
SW
30
SW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
cross-
on
onononcross-
on
cross-
on
cross-
on
crosscross-
on
ononcross-
on
cross-
on
cross-
on
cross-
on
oncross-
on
ononon
High Tide
/ height (m)
11:35AM
5.83
12:07AM
5.59
12:25PM
5.73
1:00AM
5.35
1:16PM
5.56
1:54AM
5.07
2:10PM
5.33
2:51AM
4.80
3:07PM
5.09
3:54AM
4.59
4:10PM
4.88
5:01AM
4.48
5:19PM
4.75
Low Tide
/ height (m)
5:51PM
0.73
6:08AM
1.15
6:44PM
0.89
6:59AM
1.41
7:38PM
1.13
7:51AM
1.68
8:35PM
1.39
8:47AM
1.94
9:36PM
1.64
9:49AM
2.15
10:42PM
1.81
10:58AM
2.25
11:48PM
1.88
Sunday
07
Monday
08
Tuesday
09
Wednesday
10
Thursday
11
Friday
12
Saturday
13
Sunrise8:17--8:18--8:19--8:21--8:22--8:22--8:23--
Sunset-4:00--4:00--4:00--4:00--4:00--4:00--4:00-
mod rain
rain showers
thunderstorm
part cloud
light rain
heavy rain
mod rain
light rain
light rain
part cloud
clear
clear
part cloud
part cloud
light rain
rain showers
cloud
rain showers
part cloud
clear
part cloud
Rain (mm)
641-217715-----12-4---
Temp. °C121212111213141411111110111111111010101010
Feels °C (?)453243128232023110043
  • 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 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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