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Surf Forecasts:

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

information circle12 Day Weather and Surf, issued 12 am Tuesday 16 Sep 2025 BST
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
16.3° C
 (Which is 1.1°C warmer than normal for this time of year)

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

The most powerful waves expected at Trearddur Bay (Holy Island) in the next 12 days are 3.0m 8s and forecast to arrive on Thursday (Sep 18) at 4PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 7s period and expected on Sunday (Sep 21) at 10AM.

Wave TypeTime (BST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 4PM (Thu 18th Sep)10ft (3.0m) 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 Heavy rain (total 25mm), heaviest during Tue night. Very mild (max 17°C on Thu afternoon, min 13°C on Mon night). Winds decreasing (near gales from the W on Mon night, moderate winds from the WSW by Tue afternoon).

Days 3-6 Weather Summary Heavy rain (total 35mm), heaviest during Fri night. Very mild (max 16°C on Thu night, min 10°C on Sun morning). Winds increasing (light winds from the NW on Fri night, near gales from the NNE by Sun morning).

Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Mon
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 (?)
3
W
1.9
W
1.3
WSW
1.1
SW
2.5
SW
2.1
SW
1.5
SSW
2.4
SSW
3
SSW
2.2
SW
1.3
SSW
2
SSW
1
SSW
0.7
SW
0.9
SW
0.7
SW
0.3
SW
0.1
SW
0.1
SW
0.1
SW
0.1
SW
Period(s) (?)7655876787666665814131313
Wave
Graph
(?)Metric surfscale
Energy (?)7142668264721452181530883489115336924061441711777
Wind
(km/h)
50
W
35
W
20
WSW
30
S
40
SW
35
SW
25
SSW
50
SSW
50
SSW
40
SSW
35
SSW
25
S
5
NW
40
SW
30
SSW
20
SW
55
NNE
40
NNE
30
NNE
20
N
25
N
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		cross-
on		oncross-
on		ononononcross-
on		cross-
on		cross-
on		cross-
on		crossonononcross-
off		offoffcross-
off		cross-
off
High Tide
/ height (m)
6:17AM
4.50
6:58PM
4.60
7:53AM
4.61
8:19PM
4.88
8:59AM
4.87
9:16PM
5.21
9:47AM
5.10
10:00PM
5.47
10:26AM
5.27
10:37PM
5.62
10:59AM
5.37
11:10PM
5.68
11:29AM
5.42
Low Tide
/ height (m)
11:45PM
1.96
12:26PM
2.26
1:21AM
1.88
1:53PM
2.12
2:34AM
1.57
2:55PM
1.82
3:28AM
1.24
3:42PM
1.51
4:10AM
0.98
4:20PM
1.25
4:46AM
0.83
4:55PM
1.07
5:19AM
0.77
5:27PM
0.98
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Mon
22
Sunrise-6:52--6:54--6:56--6:56--6:58--7:01--7:03-
Sunset--7:32--7:30--7:28--7:24--7:22--7:20--7:17
part cloud
clear
cloud
heavy rain
part cloud
clear
rain showers
cloud
cloud
cloud
light rain
mod rain
rain showers
rain showers
rain showers
rain showers
light rain
light rain
rain showers
clear
part cloud
Rain (mm)
---22--3---3612117321--
Temp. °C141415161616161617161616161415141012121112
Feels °C (?)48111010111081010111312799-13456
  • 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

Eyeball surf reportRecent Eyeball Surf Reports for Wales - Anglesy

  1. weather stationWind Update The wind is still cross-on at Trearddur Bay (Holy Island) (fresh winds from the W at Mona 17 km from Trearddur Bay (Holy Island)). A 2.2m windswell from the W

    52 minutes ago Trearddur Bay (Holy Island)
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<
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17 km away, 52 min ago

31 km/h
W
0.0
16.3
Air / Water (°C)
Please reload the page to see if there are any updates.

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

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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