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Surf Forecasts:

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

information circle12 Day Weather and Surf, issued 11 pm Friday 13 Feb 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
8.3° 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 Thursday (Feb 19) at 12PM. The primary swell is predicted to be 1.0m and 10s period with a secondary swell of 0.4m and 13s. Another secondary swell of 1.5m and 6s is also forecast. 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 5.5m 11s and forecast to arrive on Saturday (Feb 21) at 12AM. Winds are predicted to be 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 Tuesday (Feb 17) at 3AM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+)12PM (Thu 19th Feb)3.5ft (1.0m) 10s
Best Surf12PM (Thu 19th Feb)3.5ft (1.0m) 10s
Most Powerful12AM (Sat 21st Feb)18ft (5.5m) 11s

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 Moderate rain (total 16mm), heaviest on Sat night. Mild temperatures (max 9°C on Sun morning, min 3°C on Sat night). Mainly near gales.

Days 3-6 Weather Summary Light rain (total 3mm), mostly falling on Mon night. Mild temperatures (max 7°C on Mon night, min 2°C on Tue night). Winds decreasing (near gales from the E on Wed night, calm by Thu afternoon).

Saturday
14
Sunday
15
Monday
16
Tuesday
17
Wednesday
18
Thursday
19
Fri
20
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.4
SW
0.2
WSW
0.2
WSW
2.5
S
1.4
SW
1.6
SW
2.3
WSW
2.3
WSW
2
WSW
1.1
SW
0.6
SW
0.7
SW
0.5
SW
1.6
SE
2.5
SSE
1.1
SSW
0.9
SSW
1.2
SW
1.4
SW
4
SSW
3.5
SSW
Period(s) (?)10131378566689886771012589
Wave
Graph
(?)Metric surfscale
Energy kJ (?)23171767524211440239629518061713016575812516139610218732100
Wind
(km/h)
25
NNE
15
NW
20
SSW
55
S
15
SSW
45
W
45
W
40
W
40
W
35
NNW
30
NNE
20
ENE
25
ESE
30
ESE
50
E
50
E
35
E
5
SSE
45
S
35
S
45
SSW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		crosscross-
on		cross-
on		oncross-
on		cross-
on		cross-
on		cross-
on		cross-
off		offcross-
off		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off		glasscross-
on		cross-
on		cross-
on
High Tide
/ height (m)
8:33AM
4.79
9:02PM
4.71
9:12AM
5.09
9:37PM
4.95
9:47AM
5.36
10:10PM
5.15
10:19AM
5.57
10:41PM
5.31
10:52AM
5.73
11:14PM
5.42
11:25AM
5.82
11:47PM
5.47
12:00PM
5.83
Low Tide
/ height (m)
2:18AM
2.05
2:45PM
1.78
2:59AM
1.74
3:22PM
1.44
3:34AM
1.43
3:55PM
1.13
4:06AM
1.16
4:28PM
0.87
4:39AM
0.94
5:01PM
0.68
5:13AM
0.80
5:35PM
0.58
5:48AM
0.74
Saturday
14
Sunday
15
Monday
16
Tuesday
17
Wednesday
18
Thursday
19
Fri
20
Sunrise-7:39--7:37--7:35--7:33--7:31--7:28--7:26-
Sunset--5:25--5:28--5:30--5:31--5:34--5:36--5:37
clear
part cloud
cloud
mod rain
part cloud
rain showers
rain showers
cloud
light rain
rain showers
part cloud
cloud
cloud
cloud
cloud
cloud
cloud
cloud
light rain
rain showers
light rain
Rain (mm)
---6-43-33--------111
Temp. °C556799888754344446699
Feels °C (?)-10-3-23-1-1-1-11-3-3-3-7-9-9-13-41-1
  • 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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