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Surf Forecasts:

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

information circle12 Day Weather and Surf, issued 11 pm Sunday 15 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 Tuesday (Feb 17) at 12PM. The primary swell is predicted to be 0.5m and 8s period with a secondary swell of 0.2m and 13s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Trearddur Bay (Holy Island) in the next 12 days are 3.5m 8s and forecast to arrive on Friday (Feb 20) at 6PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.2m 7s period and expected on Monday (Feb 16) at 9PM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+)12PM (Tue 17th Feb)1.5ft (0.5m) 8s
Best Surf12PM (Thu 19th Feb)2.5ft (0.8m) 15s
Most Powerful 6PM (Fri 20th Feb)11ft (3.5m) 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 3mm), mostly falling on Sun night. Mild temperatures (max 8°C on Sun night, min 2°C on Tue night). Winds increasing (light winds from the ESE on Tue night, near gales from the E by Wed afternoon).

Days 3-6 Weather Summary Light rain (total 2mm), mostly falling on Fri afternoon. Very mild (max 10°C on Fri afternoon, min 3°C on Wed night). Winds increasing (light winds from the SW on Thu afternoon, gales from the SSW by Fri morning).

Monday
16
Tuesday
17
Wednesday
18
Thursday
19
Friday
20
Saturday
21
Sun
22
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
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 (?)
2.1
WSW
2.4
W
1.7
WNW
0.8
SW
0.5
SW
0.5
SW
0.5
SW
1.1
SE
0.9
S
0.4
SW
0.7
SW
0.7
SW
0.8
S
2.3
SSW
3.5
SSW
3.5
SSW
2.4
SW
2.2
SW
1.6
SW
1.5
SW
2
SSW
Period(s) (?)666888857101514878887767
Wave
Graph
(?)Metric surfscale
Energy kJ (?)300470230843534316276242331819045513831536646460234186361
Wind
(km/h)
40
WSW
40
W
35
W
40
NW
30
N
20
NE
20
ESE
30
ESE
50
E
45
E
25
ENE
10
SW
45
S
60
SSW
60
SSW
45
SW
45
SW
40
SW
35
SW
35
SSW
40
SW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		cross-
on		cross-
on		crosscross-
off		offcross-
off		cross-
off		cross-
off		cross-
off		cross-
off		oncross-
on		cross-
on		ononononononon
High Tide
/ height (m)
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
12:21AM
5.46
12:37PM
5.77
12:59AM
5.36
1:17PM
5.60
Low Tide
/ height (m)
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
6:11PM
0.57
6:25AM
0.78
6:49PM
0.69
7:05AM
0.92
Monday
16
Tuesday
17
Wednesday
18
Thursday
19
Friday
20
Saturday
21
Sun
22
Sunrise-7:35--7:33--7:31--7:28--7:26--7:24--7:22-
Sunset--5:30--5:31--5:34--5:36--5:37--5:39--5:42
rain showers
rain showers
thunderstorm
clear
part cloud
cloud
cloud
cloud
cloud
cloud
part cloud
clear
part cloud
cloud
light rain
cloud
light rain
part cloud
part cloud
part cloud
cloud
Rain (mm)
111-----------1-1----
Temp. °C8786542454456710101010111011
Feels °C (?)-1-30-3-3-3-6-7-7-7-11-6-6-1022433
  • 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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