Llanddwyn Island Surf Forecast

/ Wales – Anglesy (10 surf breaks) /

UK (471 surf breaks) / Lat Long: (53.13° N 4.42° W)

Surf Forecasts:

Llanddwyn Island surfForecast / Wales – Anglesy / UK

12 Day Weather and Surf, issued 6 pm Thursday 18 Sep 2025 BST

Forecast update in hr min s Forecast update imminent

Llanddwyn Island surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.

Today's Llanddwyn Island sea temperature is 16.4° C
(Which is 1.2°C warmer than normal for this time of year)

Best Forecast Surf Conditions for Llanddwyn Island this week:

The surf forecast for Llanddwyn Island over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Sep 19) at 10PM. The primary swell is predicted to be 1.1m and 6s period with a secondary swell of 0.9m and 7s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Llanddwyn Island in the next 12 days are 1.9m 7s and forecast to arrive on Friday (Sep 19) at 1AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Sunday (Sep 21) at 7PM.

Wave Type	Time (BST) & Date	Wave Height & Period
Next good surf (1 star+)	10PM (Fri 19th Sep)	3.5ft (1.1m) 6s
Best Surf	10PM (Fri 19th Sep)	3.5ft (1.1m) 6s
Most Powerful	1AM (Fri 19th Sep)	6ft (1.9m) 7s

Table - best surf conditions forecast for Llanddwyn Island over the next 12 days.

Updates in hr min s Forecast update imminent

12 Days Hourly

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	Short Range Forecast Heavy rain (total 30mm), heaviest during Sat morning. Very mild (max 18°C on Fri afternoon, min 11°C on Sat night). Winds decreasing (fresh winds from the SSW on Thu afternoon, calm by Sat morning).											Days 3-6 Weather Summary Mostly dry. Very mild (max 13°C on Tue afternoon, min 10°C on Sun night). Wind will be generally light.
	Thu 18		Friday 19			Saturday 20			Sunday 21			Monday 22			Tuesday 23			Wednesday 24
	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM
Rating (10 max)	0	0	0	0	1	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	SW	SW	SW	SW	SW	SW	SW	WSW	SW	SW	SW	W	W	W	W	W	W	W	W	W
Period(s) (?)	6	7	6	6	7	9	8	8	5	7	13	13	13	13	12	12	12	12	11	11	10
Wave Graph (?)
kJ (?)	247	381	207	216	75	47	24	17	14	14	7	7	3	3	3	3	3	3	2	2	2
Wind (km/h)	SSW	SSW	S	SSW	SE	NNW	NNW	N	NE	NNE	NE	NE	NNE	NNE	NNE	NNE	E	E	NNE	E	ESE
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	cross- on	cross- on	cross- on	cross- on	glass	glass	cross- off	cross- off	off	off	off	off	cross- off	off	cross- off	off	cross- off	cross- off	glass	cross- off	cross- off
High Tide / height (m)		8:14PM 3.62	8:51AM 3.46		8:54PM 3.88	9:23AM 3.65		9:29PM 4.09	9:53AM 3.81		10:01PM 4.22	10:22AM 3.92		10:32PM 4.26	10:51AM 3.97		11:04PM 4.22	11:21AM 3.95		11:36PM 4.08	11:51AM 3.85
Low Tide / height (m)		2:54AM 0.40		3:09PM 0.58	3:37AM 0.16		3:49PM 0.37		4:15AM 0.02	4:25PM 0.23		4:49AM -0.03	4:59PM 0.18		5:21AM 0.02	5:31PM 0.20		5:52AM 0.15	6:02PM 0.29		6:22AM 0.35

	Thu 18		Friday 19			Saturday 20			Sunday 21			Monday 22			Tuesday 23			Wednesday 24
Sunrise	-	-	6:56	-	-	6:58	-	-	7:00	-	-	7:01	-	-	7:03	-	-	7:05	-	-	7:07
Sunset	7:27	-	-	7:23	-	-	7:22	-	-	7:20	-	-	7:16	-	-	7:15	-	-	7:12	-	-

Rain (mm)	1	1	1	1	10	12	2	2	-	-	-	-	-	-	-	-	-	-	-	-	-
Temp. °C	17	17	17	18	14	15	12	11	12	12	11	12	11	11	12	13	13	12	13	14	14
Feels °C (?)	12	12	12	12	14	16	8	9	5	6	6	7	6	8	8	10	10	9	11	11	13

Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)

Recent Eyeball Surf Reports for Wales - Anglesy

Wind Update The cross-on wind has turned onshore at Rhosneigr (strong winds from the SSW at Valley RAF Airport 2 km from Rhosneigr). A 2.4m swell from the SSW
1 hour 34 minutes ago Rhosneigr

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1 h 34 min ago

37 km/h

SSW

Cross-On

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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 Llanddwyn 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.

Information about the Llanddwyn Island Surf forecast

The above surf forecast table for Llanddwyn Island provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Llanddwyn Island can be found by selecting the local surf guide option on the grey menu. Our Llanddwyn 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 (Llanddwyn 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 Llanddwyn 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 Llanddwyn Island, camping, hotels and holiday cottages in Anglesy, consider staying in Anglesey which is 15 km (9 miles) away. Other places in and around Anglesy where you can find information about places to rent, and car hire include Holyhead which is 25 km (16 miles) away, Bangor, Porthmadog and Llandudno.