Porth Nefyn Surf Forecast

/ Wales – Lleyn (14 surf breaks) /

UK (473 surf breaks) / Lat Long: (52.94° N 4.53° W)

Surf Forecasts:

Porth Nefyn surfForecast / Wales – Lleyn / UK

12 Day Weather and Surf, issued 12 pm Saturday 18 Oct 2025 BST

Forecast update in hr min s Forecast update imminent

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

Today's Porth Nefyn sea temperature is 14.6° C
(Which is slightly warmer than usual)

Best Forecast Surf Conditions for Porth Nefyn this week:

The surf forecast for Porth Nefyn over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Oct 20) at 1PM. The primary swell is predicted to be 1.2m and 9s period. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Porth Nefyn in the next 12 days are 3.5m 10s and forecast to arrive on Friday (Oct 24) at 4AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Thursday (Oct 23) at 7AM.

Wave Type	Time (BST) & Date	Wave Height & Period
Next good surf (1 star+)	1PM (Mon 20th Oct)	4ft (1.2m) 9s
Best Surf	1PM (Mon 20th Oct)	4ft (1.2m) 9s
Most Powerful	4AM (Fri 24th Oct)	11ft (3.5m) 10s

Table - best surf conditions forecast for Porth Nefyn over the next 12 days.

Updates in hr min s Forecast update imminent

12 Days Hourly

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	Short Range Forecast Moderate rain (total 18mm), heaviest on Mon morning. Very mild (max 15°C on Sun morning, min 12°C on Sat night). Winds decreasing (strong winds from the SSE on Sat night, light winds from the E by Mon morning).									Days 3-6 Weather Summary Heavy rain (total 34mm), heaviest during Wed night. Very mild (max 16°C on Wed night, min 11°C on Tue night). Winds increasing (calm on Wed morning, near gales from the SW by Thu night).
	Saturday 18			Sunday 19			Monday 20			Tuesday 21			Wednesday 22			Thursday 23			Friday 24
	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night
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 (?)	SW	W	SW	SW	SSW	SW	SW	SW	SW	WSW	WSW	W	SW	SW	SW	SW	SW	SW	WSW	WSW	WSW
Period(s) (?)	6	15	7	8	9	8	9	11	11	5	5	6	7	7	6	6	9	10	9	8	7
Wave Graph (?)
kJ (?)	8	4	132	205	386	58	186	380	137	0	62	105	34	18	6	196	390	2402	1338	1229	471
Wind (km/h)	SSE	SSE	SE	SE	SSW	SSE	ESE	NNW	WNW	W	WNW	WNW	SSE	SE	SSW	SSW	SW	WSW	SW	WSW	WNW
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	off	off	off	off	cross- off	off	cross- off	on	cross- on	cross	cross- on	cross- on	glass	off	cross- off	cross- off	cross- off	cross	cross- off	cross	cross- on
High Tide / height (m)			7:42PM 3.45	8:08AM 3.26		8:17PM 3.60	8:39AM 3.45		8:51PM 3.70	9:10AM 3.59		9:23PM 3.75	9:40AM 3.67		9:56PM 3.72	10:11AM 3.68		10:27PM 3.63	10:41AM 3.61		10:59PM 3.47
Low Tide / height (m)		2:18PM 0.63	2:45AM 0.28		2:57PM 0.47	3:20AM 0.20		3:31PM 0.36	3:51AM 0.20		4:03PM 0.32		4:20AM 0.26	4:33PM 0.32		4:48AM 0.37	5:03PM 0.38		5:17AM 0.52	5:35PM 0.50

	Saturday 18			Sunday 19			Monday 20			Tuesday 21			Wednesday 22			Thursday 23			Friday 24
Sunrise	7:48	-	-	7:50	-	-	7:52	-	-	7:54	-	-	7:54	-	-	7:56	-	-	7:58	-	-
Sunset	-	6:16	-	-	6:15	-	-	6:12	-	-	6:09	-	-	6:07	-	-	6:06	-	-	6:04	-

Rain (mm)	-	-	2	4	2	3	3	-	4	2	-	-	-	1	19	1	7	4	3	6	3
Temp. °C	13	14	14	15	14	14	14	14	13	13	13	12	12	13	16	14	11	11	11	12	13
Feels °C (?)	7	7	5	8	10	10	12	11	9	11	7	6	9	9	8	9	2	0	-1	0	4

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 - Lleyn

Wind Update The wind is still offshore at Porth Nefyn (fresh winds from the SSE at Aberdaron 22 km from Porth Nefyn). 1.0m 4s local chop from the S with a 0.2m 6s windswell from the SW. 2 swells combining to make bigger set waves.
1 hour 19 minutes ago Porth Nefyn

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22 km away, 1 h 19 min ago

33 km/h

SSE

0.0

14.6

Air / Water (°C)

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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 Porth Nefyn 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 Porth Nefyn Surf forecast

The above surf forecast table for Porth Nefyn provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Porth Nefyn can be found by selecting the local surf guide option on the grey menu. Our Porth Nefyn 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 (Porth Nefyn) 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 Porth Nefyn 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 Lleyn Peninsula? If you are looking for accommodation near Porth Nefyn, camping, hotels and holiday cottages in Lleyn Peninsula, consider staying in Porthmadog which is 27 km (17 miles) away. Other places in and around Lleyn Peninsula where you can find information about places to rent, and car hire include Anglesey which is 35 km (22 miles) away, Holyhead, Bangor and Llandudno.