Waves in Nefyn

Hourly wave forecast for 7 days · updated today, Wednesday, October 28, at 11:47 pm (GMT)

Now · significant height 3.0 ft

Sea state: Slight · Douglas 3
Period: 5.9 s · SW
Swell: 2.2 ft · 5 s
Highest expected: 6.2 ft

Today the sea at Nefyn is slight: 3.0 ft waves with a period of 5.9 s from the southwest. The swell, 2.2 ft at 5 s, comes from the southwest.

Wave height, next 7 days

2.04.06.0 ft 6.0 ft Now

Significant height: the average of the highest third of the waves, what an observer would estimate by eye. Swell: waves arriving from far away, longer.

The waves you may find today

Most common1.5 ft
Significant3.0 ft
Highest expected6.2 ft

One wave in seven is higher than the significant height, and about 3 times a day one reaches 6.2 ft. Before heading out, expect waves of up to 6.2 ft.

The Douglas sea state scale

Degree	Name	Wave height
0	Calm (glassy)	0
1	Calm (rippled)	0.0 ft–0.3 ft
2	Smooth	0.3 ft–1.6 ft
3	Slight · today	1.6 ft–4.1 ft
4	Moderate · week peak	4.1 ft–8.2 ft
5	Rough	8.2 ft–13.1 ft
6	Very rough	13.1 ft–19.7 ft

Waves day by day

Day	Max wave	Sea state	Direction	Max period	Swell	Max wind
Today	6.0 ft	Moderate	SW	7 s	3.5 ft SW	22 mph SW
Thu 29	3.0 ft	Slight	SW	6 s	2.2 ft SW	15 mph SSE
Fri 30	3.0 ft	Slight	SSW	7 s	2.2 ft SW	15 mph SSE
Sat 31	1.7 ft	Slight	SW	8 s	1.4 ft SW	4 mph SE
Sun 1	1.2 ft	Smooth	W	8 s	1.0 ft WSW	10 mph N
Mon 2	1.0 ft	Smooth	NNW	5 s	0.9 ft NNW	5 mph ENE
Tue 3	0.4 ft	Smooth	NE	6 s	0.3 ft N	6 mph NE

Today, every 3 hours

Time	12:00 am	3:00 am	6:00 am	9:00 am	12:00 pm	3:00 pm	6:00 pm	9:00 pm
Waves	5.1 ft	5.9 ft	6.0 ft	5.1 ft	4.3 ft	3.7 ft	3.3 ft	3.2 ft
Period	6.4 s	6.2 s	6.5 s	6.6 s	6.5 s	6.5 s	6.4 s	6.1 s
Direction	SW	SW	SW	SW	SW	SW	SW	SW
Swell	2.5 ft · 8 s	1.6 ft · 10 s	1.5 ft · 8 s	3.5 ft · 7 s	3.1 ft · 6 s	3.1 ft · 6 s	2.0 ft · 6 s	2.2 ft · 7 s
Wind (mph)	17 SW	19 SW	22 SW	18 WSW	15 WSW	12 SW	8 SSW	6 S

Previous days

The waves over the last 14 days. Tap a day to see it hour by hour.

Day	Max wave	Period	Swell
Tue 27	8.5 ft SW	8 s	4.3 ft SW
Mon 26	8.2 ft SW	7 s	3.0 ft WSW
Sun 25	9.8 ft W	7 s	3.0 ft SW
Sat 24	9.2 ft WSW	7 s	3.9 ft W
Fri 23	7.2 ft WNW	10 s	2.3 ft SW
Thu 22	3.9 ft WSW	6 s	2.3 ft SW
Wed 21	5.9 ft WSW	6 s	3.3 ft WSW

Show all 14 days

Day	Max wave	Period	Swell
Tue 20	1.6 ft S	5 s	1.3 ft SSW
Mon 19	2.0 ft NE	4 s	1.6 ft N
Sun 18	1.0 ft NNW	6 s	0.7 ft NW
Sat 17	3.3 ft NNW	5 s	2.3 ft NNW
Fri 16	3.3 ft WNW	8 s	2.3 ft WSW
Thu 15	6.9 ft SW	8 s	4.9 ft SW
Wed 14	5.6 ft SW	7 s	3.3 ft SW

These are the models at the start of each day (ECMWF and GFS; waves from Météo-France), not readings from a weather station: there can be differences at specific spots.

Questions about the waves in NefynQuestions

How are the waves today in Nefyn?

Slight (3.0 ft with a period of 5.9 s from the southwest). The highest wave to expect is around 6.2 ft.

Which day will have the biggest waves this week?

Wednesday 28, with waves up to 6.0 ft (moderate).

What is the wave period?

The time, in seconds, between two crests. With long periods (over 10 s) waves come from far away, are cleaner and break harder; with short periods they are wind waves, choppier.

What is significant wave height?

The average of the highest third of the waves. One in seven is higher and, a few times a day, one comes in at almost double: today, about 6.2 ft.

More about Nefyn today

Waves near Nefyn

Only places with a different forecast: spots a few miles apart share the same model cell and wouldn't add anything.

Learn more

Waves: Open-Meteo with Météo-France (MFWAM, up to 10 days) and ECMWF WAM, CC BY 4.0; wave grid point 1.8 mi away. Near the shore, the seabed and the shape of the coast change the waves.

Forecast from Open-Meteo (CC BY 4.0) with models from ECMWF, NOAA, Météo-France, DWD, Copernicus Marine and CAMS. Updated at 11:47 pm (local time).

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