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Surf Forecasts:

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

information circle48hr Weather and Surf, issued 5 am Friday 21 Nov 2025 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
12.5° C
 (Which is 1.0°C warmer than 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 8AM is: 0.2m 3s primary swell from a West-northwest direction (forecast issued at 05:00am November 21). An open ocean swell of 0.4m 4s is not directed at the surf break. The wind direction is predicted to be glassy.

Time (GMT) & DateWave HeightWave Period
Morning (21 Nov)0.5ft (0.2m)3s
Afternoon (21 Nov)2ft (0.6m)3s
Evening (21 Nov)5ft (1.5m)5s

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
Friday
21
Saturday
22
Sunday
23
Mon
24
3 AM6 AM9 AM12 PM3 PM6 PM9 PM0 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM0 AM3 AM6 AM9 AM12 PM3 PM6 PM9 PM0 AM
Rating
(10 max)
0
0
0
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 (?)
0.1
W
0.2
WNW
0.2
WNW
0.1
W
0.6
WSW
1.1
SW
1.5
SW
2.1
SSW
2.4
SSW
1.7
SSW
1.1
SSW
0.9
SSW
0.8
SSW
0.9
SW
0.9
SSW
2.1
SSW
2.5
SW
2.5
SW
3
SW
3.5
SW
2.5
SW
1.4
SW
1.1
SW
0.8
SW
Period(s) (?)123315345677777776778999109
Wave
Graph
(?)Metric surfscale
Energy kJ (?)31147391153255302781137057656831764166710521573987311236114
Wind
(km/h)
15
N
10
N
5
W
15
WSW
35
SW
40
SW
45
SW
50
SSW
35
W
20
WNW
15
NW
20
W
15
SW
20
SW
25
SSW
35
SSW
45
W
50
W
50
W
50
W
50
WSW
55
WSW
60
W
60
WNW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off		cross-
off		cross-
on		ononononcross-
on		cross-
on		crosscrosscross-
on		ononcross-
on		oncross-
on		cross-
on		cross-
on		cross-
on		cross-
on		oncross-
on		cross
High Tide
/ height (m)
10:38AM
5.43
10:54PM
5.23
11:10AM
5.42
11:29PM
5.13
11:45AM
5.37
Low Tide
/ height (m)
4:27AM
1.34
4:45PM
1.38
4:59AM
1.42
5:19PM
1.44
5:32AM
1.55
5:55PM
1.53
Friday
21
Saturday
22
Sunday
23
Mon
24
Sunrise--7:52-------7:54-------7:56-----
Sunset----4:14-------4:13-------4:12---
clear
clear
part cloud
cloud
cloud
cloud
cloud
mod rain
mod rain
rain showers
clear
clear
part cloud
cloud
cloud
light rain
rain showers
cloud
light rain
part cloud
cloud
cloud
light rain
light rain
Rain (mm)
-------671-----37-1---12
Temp. °C77778888101010910101010129999988
Feels °C (?)34420-1-2-2356565423-2-2-2-3-4-5-4
  • 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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View detailed surf forecast for Trearddur Bay (Holy Island) at:
surf-forecast.com

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