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Surf Forecasts:

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

information circle48hr Weather and Surf, issued 11 pm Sunday 18 Jan 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 normal for this time of year)

How big are the waves at Trearddur Bay (Holy Island) today?

The current surf forecast for Trearddur Bay (Holy Island) at 3AM is: 0.9m 5s primary swell from a South-southwest direction and 0.1m 7s secondary swell from a Southwest direction (forecast issued at 11:00pm January 18). The wind direction is predicted to be cross-onshore.

Time (GMT) & DateWave HeightWave Period
Morning (19 Jan)2.5ft (0.8m)5s
Afternoon (19 Jan)3ft (0.9m)5s
Evening (19 Jan)4.5ft (1.4m)6s

Table - waves today at Trearddur Bay (Holy Island). (Swell directed towards the surf break)

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table
Monday
19
Tuesday
20
Wednesday
21
9 PM0 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM0 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM0 AM3 AM6 AM9 AM12 PM3 PM6 PM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
1
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.9
SSW
0.9
SSW
0.9
SSW
0.8
SSW
0.8
SSW
0.8
SW
0.9
SSW
0.9
SSW
1.4
SSW
1.6
SSW
1.2
SSW
1
SSW
1.5
S
2.2
S
3
S
2.4
S
2.5
SSW
2.5
SSW
2.3
SSW
2
SSW
1.6
S
1.2
SSW
1.6
SE
1.5
SE
Period(s) (?)555555566665678889999866
Wave
Graph
(?)Metric surfscale
Energy kJ (?)3037302425354661144179815515443412167248291048813586393185149141
Wind
(km/h)
25
S
30
S
25
SSE
20
SSE
15
SE
15
SSE
20
SSE
25
SE
30
SSE
35
SSW
30
SSE
30
ESE
45
SE
50
SE
55
SE
55
SSE
40
SE
50
SSE
40
SSE
20
ESE
25
ESE
25
E
40
ENE
25
ESE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		cross-
on		cross-
on		crosscrosscrosscrosscrosscrosscross-
on		cross-
on		cross-
off		cross-
off		crosscrosscrosscrosscross-
on		cross-
on		cross-
off		cross-
off		cross-
off		cross-
off		cross-
off
High Tide
/ height (m)
10:30PM
5.12
10:42AM
5.53
11:04PM
5.20
11:16AM
5.62
11:38PM
5.24
11:49AM
5.65
Low Tide
/ height (m)
4:28AM
1.34
4:51PM
1.14
5:02AM
1.22
5:25PM
1.02
5:36AM
1.15
6:00PM
0.94
Monday
19
Tuesday
20
Wednesday
21
Sunrise----8:21-------8:19-------8:18---
Sunset------4:36-------4:37-------4:39-
cloud
part cloud
clear
clear
clear
clear
part cloud
cloud
cloud
part cloud
cloud
part cloud
cloud
cloud
cloud
light rain
light rain
cloud
clear
part cloud
cloud
cloud
light rain
rain showers
Rain (mm)
---------------22-----31
Temp. °C8877789986777998888677610
Feels °C (?)211223431-20-1-3-2-3-3-1-2-1010-35
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

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FREE! Surf-Forecast.com widget for your website

The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Trearddur Bay (Holy Island) surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.

View detailed surf forecast for Trearddur Bay (Holy Island) at:
surf-forecast.com

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