Waves in Sepetiba

Hourly wave forecast for 7 days · updated today, Wednesday, October 28, at 8:57 pm (GMT-3)

Now · significant height 3.4 ft

Sea state: Slight · Douglas 3
Period: 6.8 s · SE
Swell: 2.4 ft · 4 s
Highest expected: 7.0 ft

Today the sea at Sepetiba is slight: 3.4 ft waves with a period of 6.8 s from the southeast. The swell, 2.4 ft at 4 s, comes from the southeast.

Wave height, next 7 days

1.02.03.04.0 ft 4.1 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 common1.7 ft
Significant3.4 ft
Highest expected7.0 ft

One wave in seven is higher than the significant height, and about 3 times a day one reaches 7.0 ft. Before heading out, expect waves of up to 7.0 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	4.1 ft	Moderate	SSE	8 s	3.6 ft SSE	12 mph E
Thu 29	3.0 ft	Slight	SE	8 s	2.2 ft SSE	7 mph ESE
Fri 30	2.7 ft	Slight	SE	8 s	2.3 ft SE	5 mph SSW
Sat 31	2.4 ft	Slight	SSE	8 s	1.7 ft SSE	10 mph SW
Sun 1	2.6 ft	Slight	SSE	7 s	2.2 ft SE	10 mph ESE
Mon 2	3.1 ft	Slight	SE	7 s	2.8 ft SE	12 mph E
Tue 3	2.8 ft	Slight	SE	7 s	2.3 ft SE	5 mph WSW

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	4.1 ft	3.8 ft	3.5 ft	3.3 ft	3.2 ft	3.5 ft	3.6 ft	3.4 ft
Period	8.4 s	8.2 s	8.1 s	8.1 s	7.8 s	6.7 s	6.5 s	6.8 s
Direction	SSE	SSE	SSE	SSE	SSE	SSE	SE	SE
Swell	3.6 ft · 8 s	3.3 ft · 8 s	3.0 ft · 8 s	2.9 ft · 8 s	2.6 ft · 7 s	2.3 ft · 8 s	2.3 ft · 8 s	2.4 ft · 4 s
Wind (mph)	7 ENE	7 ENE	5 ENE	5 NE	6 ESE	11 ESE	11 E	9 ENE

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	5.6 ft S	9 s	5.2 ft S
Mon 26	4.6 ft SSW	7 s	3.3 ft S
Sun 25	2.6 ft SSE	8 s	1.6 ft SSE
Sat 24	3.0 ft SSE	9 s	3.0 ft SSE
Fri 23	3.6 ft SSE	10 s	3.3 ft SSE
Thu 22	3.9 ft SSE	9 s	3.3 ft SSE
Wed 21	4.3 ft SSE	9 s	3.6 ft S

Show all 14 days

Day	Max wave	Period	Swell
Tue 20	4.6 ft S	9 s	4.3 ft S
Mon 19	5.9 ft S	10 s	4.9 ft SSW
Sun 18	5.6 ft S	10 s	4.9 ft S
Sat 17	3.9 ft SSE	9 s	3.3 ft SSE
Fri 16	3.3 ft SSE	9 s	3.3 ft SSE
Thu 15	2.3 ft SSE	8 s	2.0 ft SSE
Wed 14	2.3 ft S	9 s	2.3 ft S

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 SepetibaQuestions

How are the waves today in Sepetiba?

Slight (3.4 ft with a period of 6.8 s from the southeast). The highest wave to expect is around 7.0 ft.

Which day will have the biggest waves this week?

Wednesday 28, with waves up to 4.1 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 7.0 ft.

More about Sepetiba today

Waves near Sepetiba

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 1.6 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 8:57 pm (local time).

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