Trearddur Bay (Holy Island) Surf Forecast

/ Wales – Anglesy (10 surf breaks) /

UK (473 surf breaks) / Lat Long: (53.28° N 4.62° W)

Surf Forecasts:

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

48hr Weather and Surf, issued 11 pm Monday 17 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 12.9° C
(Which is 1.1°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 6AM is: 0.8m 4s primary swell from a West-northwest direction and 0.2m 8s secondary swell from a South-southwest direction, 0.1m 13s secondary swell from a South direction (forecast issued at 11:00pm November 17). The wind direction is predicted to be cross-onshore.

Time (GMT) & Date	Wave Height	Wave Period
Morning (18 Nov)	3.5ft (1.1m)	5s
Afternoon (18 Nov)	5.5ft (1.7m)	6s
Evening (18 Nov)	0.5ft (0.1m)	13s

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

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

		Tuesday 18								Wednesday 19								Thursday 20
	9 PM	0 AM	3 AM	6 AM	9 AM	12 PM	3 PM	6 PM	9 PM	0 AM	3 AM	6 AM	9 AM	12 PM	3 PM	6 PM	9 PM	0 AM	3 AM	6 AM	9 AM	12 PM	3 PM	6 PM
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 (?)	SW	SSW	SSW	WNW	W	WNW	WNW	NW	SW	SW	S	SW	SW	S	S	S	NNW	NNW	NNW	NNW	S	W	NNW	NNW
Period(s) (?)	9	9	8	4	5	5	6	6	13	12	12	13	8	8	12	12	6	6	6	6	12	4	6	6
Wave Graph (?)
kJ (?)	20	7	7	19	52	149	188	224	6	6	3	6	2	1	3	3	0	0	0	0	3	3	0	0
Wind (km/h)	WNW	WNW	W	W	W	WNW	WNW	NW	N	N	N	N	N	N	N	N	N	NNW	NNW	N	N	N	N	N
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	cross- on	cross	cross- on	cross- on	cross- on	cross- on	cross	cross	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off	cross- off
High Tide / height (m)	8:42PM 5.22					9:04AM 5.18				9:17PM 5.26				9:35AM 5.29				9:49PM 5.28				10:06AM 5.38
Low Tide / height (m)			2:51AM 1.35					3:04PM 1.53				3:24AM 1.31				3:38PM 1.43				3:55AM 1.31				4:11PM 1.38

		Tuesday 18								Wednesday 19								Thursday 20
Sunrise	-	-	-	-	7:47	-	-	-	-	-	-	-	7:48	-	-	-	-	-	-	-	7:50	-	-	-
Sunset	-	-	-	-	-	-	4:17	-	-	-	-	-	-	-	4:16	-	-	-	-	-	-	-	4:15	-

Rain (mm)	-	-	-	-	1	1	1	1	-	-	1	-	-	-	-	1	1	1	1	1	-	1	1	-
Temp. °C	7	7	8	7	8	9	9	9	6	7	6	5	6	6	6	6	5	6	6	6	7	6	7	7
Feels °C (?)	3	1	2	0	-1	0	-1	-2	-4	-3	-5	-6	-4	-4	-4	-4	-4	-4	-4	-4	-2	-3	-2	-1

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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