Waves in Jiufen

Hourly wave forecast for 7 days · updated today, Thursday, October 29, at 10:41 am (GMT+8)

Now · significant height 4.8 ft

Sea state: Moderate · Douglas 4
Period: 7.4 s · NE
Swell: 4.8 ft · 6 s
Highest expected: 9.7 ft

Today the sea at Jiufen is moderate: 4.8 ft waves with a period of 7.4 s from the northeast. The swell, 4.8 ft at 6 s, comes from the northeast.

Wave height, next 7 days

2.04.06.0 ft 6.3 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 common2.4 ft
Significant4.8 ft
Highest expected9.7 ft

One wave in seven is higher than the significant height, and about 3 times a day one reaches 9.7 ft. Before heading out, expect waves of up to 9.7 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	1.6 ft–4.1 ft
4	Moderate · today	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	6.3 ft	Moderate	NE	8 s	6.1 ft NE	5 mph ESE
Fri 30	3.5 ft	Slight	NE	7 s	2.9 ft NE	8 mph NE
Sat 31	4.8 ft	Moderate	ENE	6 s	3.8 ft ENE	9 mph ESE
Sun 1	4.7 ft	Moderate	E	10 s	3.8 ft E	9 mph SE
Mon 2	5.5 ft	Moderate	ENE	11 s	4.3 ft ENE	8 mph NE
Tue 3	5.6 ft	Moderate	NE	8 s	4.6 ft NE	7 mph ENE
Wed 4	5.0 ft	Moderate	ENE	9 s	3.1 ft E	6 mph ESE

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	6.3 ft	5.8 ft	5.3 ft	4.9 ft	4.6 ft	4.3 ft	4.0 ft	3.7 ft
Period	7.5 s	7.5 s	7.5 s	7.5 s	7.4 s	7.5 s	7.4 s	7.4 s
Direction	NE	NE	NE	NE	NE	NE	NE	NE
Swell	6.1 ft · 6 s	5.7 ft · 6 s	5.2 ft · 6 s	4.9 ft · 6 s	4.5 ft · 6 s	4.1 ft · 6 s	3.7 ft · 6 s	3.1 ft · 6 s
Wind (mph)	5 SE	4 SE	4 SE	4 ESE	5 ESE	5 E	4 ESE	4 SE

Previous days

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

Day	Max wave	Period	Swell
Wed 28	10 ft NE	8 s	9.5 ft NE
Tue 27	8.2 ft NNE	9 s	7.2 ft NE
Mon 26	8.9 ft NNE	9 s	8.5 ft NNE
Sun 25	9.8 ft NNE	9 s	8.5 ft N
Sat 24	26 ft NE	12 s	21 ft NE
Fri 23	28 ft ENE	12 s	21 ft ESE
Thu 22	21 ft ENE	12 s	14 ft E

Show all 14 days

Day	Max wave	Period	Swell
Wed 21	13 ft E	12 s	7.9 ft ESE
Tue 20	4.3 ft E	11 s	3.0 ft E
Mon 19	3.6 ft ENE	7 s	3.3 ft E
Sun 18	3.9 ft E	7 s	3.0 ft E
Sat 17	3.3 ft E	6 s	2.6 ft ENE
Fri 16	4.3 ft ENE	7 s	3.3 ft NNE
Thu 15	5.6 ft NE	7 s	5.2 ft NE

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 JiufenQuestions

How are the waves today in Jiufen?

Moderate (4.8 ft with a period of 7.4 s from the northeast). The highest wave to expect is around 9.7 ft.

Which day will have the biggest waves this week?

Thursday 29, with waves up to 6.3 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 9.7 ft.

More about Jiufen today

Waves near Jiufen

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 9.9 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 10:41 am (local time).

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