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Surf Forecasts:

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

information circle16 Day Weather and Surf, issued 11 pm Saturday 14 Mar 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
8.5° C
 (Which is 1.0°C warmer than normal for this time of year)

Best Forecast Surf Conditions for Trearddur Bay (Holy Island) this week:

The surf forecast for Trearddur Bay (Holy Island) over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Mar 18) at 12PM. The primary swell is predicted to be 0.8m and 7s period with a secondary swell of 0.3m and 16s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Trearddur Bay (Holy Island) in the next 16 days are 3.0m 8s and forecast to arrive on Tuesday (Mar 17) at 9AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Sunday (Mar 22) at 6AM.

Wave TypeTime (GMT) & Date Wave Height & Period
Next good surf (1 star+)12PM (Wed 18th Mar)2.5ft (0.8m) 7s
Best Surf12PM (Wed 18th Mar)2.5ft (0.8m) 7s
Most Powerful 9AM (Tue 17th Mar)10ft (3.0m) 8s

Table - best surf conditions forecast for Trearddur Bay (Holy Island) over the next 16 days.

Updates in  hr  min  s Forecast update imminent 
16 DaysHourly
Print Table

Short Range Forecast Light rain (total 4mm), mostly falling on Sun morning. Very mild (max 11°C on Tue afternoon, min 6°C on Sun night). Winds increasing (light winds from the SW on Sat night, near gales from the SW by Mon afternoon).

Days 3-6 Weather Summary Mostly dry. Very mild (max 13°C on Wed afternoon, min 7°C on Thu night). Winds decreasing (fresh winds from the S on Tue night, calm by Fri morning).

Sunday
15
Monday
16
Tuesday
17
Wednesday
18
Thursday
19
Friday
20
Sat
21
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.4
SSW
2.1
SW
1.6
WSW
2.4
W
2
WSW
2.5
SW
2.5
SSW
3
SSW
2.5
SSW
1.7
SSW
0.9
SSW
0.7
SW
0.4
SSW
0.1
W
0.1
W
0.4
NNE
0.1
NE
0.1
SW
0.2
SSW
0.2
SSW
0.2
SSW
Period(s) (?)7667677887777131644101099
Wave
Graph
(?)Metric surfscale
Energy kJ (?)21326184495309742758930762256965017350041088
Wind
(km/h)
20
SW
45
SW
40
W
45
W
40
SW
55
SW
50
SSW
50
S
40
SSW
25
S
10
S
10
N
20
NNE
20
NNE
25
NNE
25
ENE
15
ESE
5
NNE
20
E
30
E
25
ENE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
ononcross-
on		cross-
on		ononcross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
off		offoffoffcross-
off		cross-
off		offcross-
off		cross-
off		off
High Tide
/ height (m)
7:59AM
4.66
8:33PM
4.63
8:40AM
5.01
9:08PM
4.92
9:15AM
5.32
9:40PM
5.18
9:49AM
5.58
10:12PM
5.40
10:23AM
5.78
10:45PM
5.55
10:58AM
5.90
11:19PM
5.63
11:36AM
5.91
Low Tide
/ height (m)
1:47AM
2.12
2:14PM
1.71
2:29AM
1.74
2:51PM
1.32
3:04AM
1.36
3:25PM
0.95
3:37AM
1.02
3:57PM
0.66
4:11AM
0.74
4:32PM
0.45
4:46AM
0.56
5:08PM
0.36
5:23AM
0.49
5:46PM
0.42
Sunday
15
Monday
16
Tuesday
17
Wednesday
18
Thursday
19
Friday
20
Sat
21
Sunrise-6:33--6:31--6:28--6:26--6:24--6:22--6:18-
Sunset--6:21--6:22--6:24--6:27--6:29--6:30--6:31
cloud
rain showers
cloud
light rain
cloud
light rain
cloud
cloud
part cloud
part cloud
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
clear
clear
clear
Rain (mm)
-2-1-1---------------
Temp. °C89878999111112131311111089878
Feels °C (?)30-1-3-1-20-13711119663473-10
  • 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 16 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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