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Surf Forecasts:

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

information circle48hr Weather and Surf, issued 5 pm Tuesday 20 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 8PM is: 1.9m 8s primary swell from a South-southwest direction and 0.2m 14s secondary swell from a West-southwest direction (forecast issued at 05:00pm January 20). An open ocean swell of 0.1m 6s is not directed at the surf break. The wind direction is predicted to be cross-onshore.

Time (GMT) & DateWave HeightWave Period
Morning (20 Jan)--
Afternoon (20 Jan)10ft (3.0m)8s
Evening (20 Jan)6ft (1.8m)8s

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
Tuesday
20
Wednesday
21
Thursday
22
Friday
23
3 PM6 PM9 PM0 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM0 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM0 AM3 AM6 AM9 AM12 PM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
0
0
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
3
S
1.9
SSW
1.8
SSW
2
SSW
2.1
SSW
2
SSW
1.5
SSW
1.3
SSW
1.2
SSW
1.6
S
1.5
S
1.5
S
0.9
SW
0.6
SW
1.3
SSW
1.2
SSW
1
SSW
1
SW
0.9
SW
0.9
SSW
0.6
SSW
0.6
SW
0.5
SW
0.6
SW
Period(s) (?)88877778888881610101099999818
Wave
Graph
(?)Metric surfscale
Energy kJ (?)1039485427392456381229212168331295284105168325258196170135124536229210
Wind
(km/h)
50
SE
40
S
45
SSE
40
SSE
35
SSE
25
SE
35
ESE
40
ESE
35
ESE
40
SE
40
SSE
30
SSE
25
SE
20
SE
20
ESE
25
ESE
20
SW
25
SW
25
S
25
SE
25
ESE
30
ESE
45
E
45
ESE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
crosscross-
on		cross-
on		cross-
on		cross-
on		crosscross-
off		cross-
off		cross-
off		crosscrosscrosscrosscrosscross-
off		cross-
off		ononcross-
on		crosscross-
off		cross-
off		cross-
off		cross-
off
High Tide
/ height (m)
11:38PM
5.24
11:49AM
5.65
12:12AM
5.25
12:24PM
5.64
12:47AM
5.21
Low Tide
/ height (m)
5:25PM
1.02
5:36AM
1.15
6:00PM
0.94
6:11AM
1.13
6:36PM
0.93
6:48AM
1.17
Tuesday
20
Wednesday
21
Thursday
22
Friday
23
Sunrise------8:18-------8:18-------8:15-
Sunset4:37-------4:39-------4:42-------
light rain
light rain
rain showers
part cloud
cloud
cloud
cloud
light rain
cloud
light rain
light rain
cloud
cloud
cloud
cloud
cloud
light rain
part cloud
clear
cloud
cloud
cloud
cloud
cloud
Rain (mm)
251----1-21-----1-------
Temp. °C987777781011109999988766776
Feels °C (?)-2-1-3-2-21-1-133124444321-1-1-1-3-4
  • 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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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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