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Surf Forecasts:

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

information circle12 Day Weather and Surf, issued 11 am Wednesday 11 Mar 2026 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
8.6° C
 (Which is 1.2°C warmer than normal for this time of year)

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 (Mar 17) at 9PM. The primary swell is predicted to be 2.2m and 8s period with a secondary swell of 1.4m and 9s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Trearddur Bay (Holy Island) in the next 12 days are 5.0m 10s and forecast to arrive on Thursday (Mar 12) at 12PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 6s period and expected on Saturday (Mar 14) at 3PM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Tue 17th Mar)7ft (2.2m) 8s
Best Surf 9PM (Tue 17th Mar)7ft (2.2m) 8s
Most Powerful12PM (Thu 12th Mar)16ft (5.0m) 10s

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

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

Short Range Forecast Moderate rain (total 13mm), heaviest on Thu night. Very mild (max 11°C on Thu morning, min 4°C on Thu night). Winds decreasing (severe gales from the SSW on Thu morning, moderate winds from the WNW by Fri night).

Days 3-6 Weather Summary Light rain (total 4mm), mostly falling on Sat afternoon. Mild temperatures (max 8°C on Sun morning, min 6°C on Sat morning). Winds increasing (light winds from the W on Sat night, strong winds from the SSW by Mon afternoon).

Wednesday
11
Thursday
12
Friday
13
Saturday
14
Sunday
15
Monday
16
Tuesday
17
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
2.2
WSW
1.3
SW
2.5
SW
4.5
SW
4.5
SW
3
SW
3
SW
2.1
SW
1
SW
1.4
WNW
1.2
WSW
1.1
SW
1.7
SSW
1.6
WSW
2.2
NW
1.3
WSW
2
SSW
3
SSW
3
SSW
3
SSW
2.2
SSW
Period(s) (?)6679107889656656567887
Wave
Graph
(?)Metric surfscale
Energy kJ (?)38114556729733761869128662514511463751761283887828982910141184487
Wind
(km/h)
40
W
30
SW
55
SSW
70
SSW
50
SW
45
WSW
55
WSW
30
W
35
WNW
25
WNW
20
WSW
20
W
40
SSW
40
W
35
W
30
SW
50
SSW
45
S
50
S
40
S
10
NE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		ononcross-
on		oncross-
on		oncross-
on		crosscross-
on		cross-
on		cross-
on		oncross-
on		cross-
on		oncross-
on		cross-
on		cross-
on		cross-
on		off
High Tide
/ height (m)
3:14PM
4.22
3:49AM
4.22
4:40PM
3.97
5:25AM
4.13
6:39PM
4.02
7:01AM
4.33
7:50PM
4.31
7:59AM
4.66
8:33PM
4.63
8:40AM
5.01
9:08PM
4.92
9:15AM
5.32
9:40PM
5.18
Low Tide
/ height (m)
9:33PM
2.39
10:15AM
2.42
11:04PM
2.59
12:04PM
2.42
12:44AM
2.46
1:25PM
2.11
1:47AM
2.12
2:14PM
1.71
2:29AM
1.74
2:51PM
1.32
3:04AM
1.36
3:25PM
0.95
Wednesday
11
Thursday
12
Friday
13
Saturday
14
Sunday
15
Monday
16
Tuesday
17
Sunrise6:43--6:41--6:39--6:35--6:33--6:31--6:28--
Sunset-6:14--6:15--6:16--6:19--6:21--6:22--6:24-
clear
part cloud
part cloud
light rain
light rain
rain showers
cloud
thunderstorm
rain showers
part cloud
light rain
rain showers
light rain
light rain
part cloud
part cloud
part cloud
part cloud
cloud
light rain
rain showers
Rain (mm)
---126-13-1111-----12
Temp. °C81091110568777788788810108
Feels °C (?)-130-50-5-21-1011-1-2-2-1-3-2014
  • 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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