Waves in Castro

Hourly wave forecast for 7 days · updated today, Wednesday, October 28, at 7:49 pm (GMT-3)

Now · significant height 0.3 ft

Sea state: Calm (rippled) · Douglas 1
Period: 2.3 s · SE
Swell: 0.3 ft · 2 s
Highest expected: 0.7 ft

Today the sea at Castro is calm (rippled): 0.3 ft waves with a period of 2.3 s from the southeast. The swell, 0.3 ft at 2 s, comes from the southeast. Biggest waves: Saturday 31, with waves up to 0.8 ft (smooth).

Wave height, next 7 days

1.02.03.0 ft 0.8 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 common0.2 ft
Significant0.3 ft
Highest expected0.7 ft

One wave in seven is higher than the significant height, and about 3 times a day one reaches 0.7 ft. Before heading out, expect waves of up to 0.7 ft.

The Douglas sea state scale

Degree	Name	Wave height
0	Calm (glassy)	0
1	Calm (rippled) · today	0.0 ft–0.3 ft
2	Smooth · week peak	0.3 ft–1.6 ft
3	Slight	1.6 ft–4.1 ft
4	Moderate	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	0.6 ft	Smooth	SE	3 s	0.5 ft SE	6 mph SSW
Thu 29	0.5 ft	Smooth	ESE	3 s	0.5 ft ESE	8 mph WSW
Fri 30	0.3 ft	Calm (rippled)	ESE	2 s	0.3 ft ESE	8 mph S
Sat 31	0.8 ft	Smooth	N	2 s	0.3 ft ENE	9 mph NW
Sun 1	0.7 ft	Smooth	NW	2 s	0.5 ft NNW	13 mph WNW
Mon 2	0.7 ft	Smooth	NNE	3 s	0.5 ft NNE	7 mph SSW
Tue 3	0.8 ft	Smooth	NNE	3 s	0.7 ft NE	5 mph SSW

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	0.6 ft	0.3 ft	0.3 ft	0.3 ft	0.3 ft	0.3 ft	0.3 ft	0.3 ft
Period	2.8 s	2.7 s	2.6 s	2.5 s	2.3 s	2.2 s	2.2 s	2.4 s
Direction	SE	SE	SE	SE	SE	SE	SE	SE
Swell	0.5 ft · 2 s	0.3 ft · 2 s	0.3 ft · 2 s	0.2 ft · 2 s	0.2 ft · 2 s	0.3 ft · 2 s	0.3 ft · 2 s	0.3 ft · 2 s
Wind (mph)	5 WSW	4 WSW	4 WSW	4 SW	3 SE	5 ESE	4 ESE	2 SW

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	0.7 ft SE	3 s	0.7 ft SE
Mon 26	0.3 ft SE	3 s	0.3 ft SE
Sun 25	0.3 ft SSE	2 s	0.0 ft SSE
Sat 24	0.0 ft ENE	2 s	0.0 ft ENE
Fri 23	0.0 ft ESE	3 s	0.0 ft ESE
Thu 22	0.7 ft SE	3 s	0.7 ft SE
Wed 21	0.7 ft ESE	3 s	0.3 ft ESE

Show all 14 days

Day	Max wave	Period	Swell
Tue 20	0.3 ft SE	3 s	0.3 ft SE
Mon 19	0.7 ft SE	3 s	0.7 ft SE
Sun 18	0.3 ft ESE	3 s	0.3 ft ESE
Sat 17	0.7 ft ENE	2 s	0.3 ft ENE
Fri 16	0.0 ft ESE	2 s	0.0 ft ESE
Thu 15	0.0 ft SE	3 s	0.0 ft SSE
Wed 14	0.3 ft SE	3 s	0.3 ft SE

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 CastroQuestions

How are the waves today in Castro?

Calm (rippled) (0.3 ft with a period of 2.3 s from the southeast). The highest wave to expect is around 0.7 ft.

Which day will have the biggest waves this week?

Saturday 31, with waves up to 0.8 ft (smooth).

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 0.7 ft.

More about Castro today

Waves near Castro

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 8.9 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 7:49 pm (local time).

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