Waves in Koh Tao

Hourly wave forecast for 7 days · updated today, Thursday, October 29, at 11:48 am (GMT+7)

Now · significant height 2.2 ft

Sea state: Slight · Douglas 3
Period: 3.6 s · E
Swell: 1.2 ft · 3 s
Highest expected: 4.6 ft

Today the sea at Koh Tao is slight: 2.2 ft waves with a period of 3.6 s from the east. The swell, 1.2 ft at 3 s, comes from the east-northeast.

Wave height, next 7 days

1.02.03.0 ft 2.2 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 common1.1 ft
Significant2.2 ft
Highest expected4.6 ft

One wave in seven is higher than the significant height, and about 3 times a day one reaches 4.6 ft. Before heading out, expect waves of up to 4.6 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	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	2.2 ft	Slight	E	4 s	1.5 ft ENE	18 mph ESE
Fri 30	2.1 ft	Slight	ESE	3 s	1.4 ft E	17 mph ESE
Sat 31	1.4 ft	Smooth	ESE	3 s	1.2 ft ESE	17 mph ESE
Sun 1	1.2 ft	Smooth	E	4 s	1.1 ft ESE	12 mph E
Mon 2	0.7 ft	Smooth	E	3 s	0.7 ft E	9 mph ENE
Tue 3	0.3 ft	Calm (rippled)	E	3 s	0.3 ft E	7 mph E
Wed 4	0.7 ft	Smooth	E	3 s	0.5 ft E	11 mph E

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	2.1 ft	2.0 ft	2.0 ft	2.2 ft	2.2 ft	2.2 ft	2.1 ft	2.0 ft
Period	3.7 s	3.6 s	3.5 s	3.5 s	3.6 s	3.6 s	3.5 s	3.4 s
Direction	E	E	E	E	E	ESE	ESE	ESE
Swell	1.1 ft · 4 s	1.0 ft · 4 s	1.2 ft · 4 s	1.0 ft · 3 s	1.3 ft · 3 s	1.3 ft · 4 s	1.0 ft · 3 s	0.9 ft · 3 s
Wind (mph)	15 ESE	14 E	14 ESE	16 SE	17 SE	17 SE	14 SE	17 ESE

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	3.6 ft E	4 s	1.3 ft ESE
Tue 27	2.6 ft E	4 s	1.6 ft ENE
Mon 26	2.3 ft E	4 s	1.0 ft E
Sun 25	0.7 ft W	2 s	0.7 ft WNW
Sat 24	0.7 ft WSW	3 s	0.3 ft W
Fri 23	0.0 ft ESE	4 s	0.0 ft ESE
Thu 22	0.3 ft ENE	3 s	0.3 ft ENE

Show all 14 days

Day	Max wave	Period	Swell
Wed 21	0.7 ft ENE	4 s	0.7 ft ENE
Tue 20	1.0 ft ENE	5 s	1.0 ft ENE
Mon 19	0.3 ft ENE	3 s	0.3 ft E
Sun 18	0.3 ft ESE	4 s	0.3 ft ESE
Sat 17	0.3 ft ESE	4 s	0.0 ft ESE
Fri 16	0.3 ft E	4 s	0.3 ft E
Thu 15	0.7 ft ENE	3 s	0.7 ft E

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 Koh TaoQuestions

How are the waves today in Koh Tao?

Slight (2.2 ft with a period of 3.6 s from the east). The highest wave to expect is around 4.6 ft.

Which day will have the biggest waves this week?

Thursday 29, with waves up to 2.2 ft (slight).

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 4.6 ft.

More about Koh Tao today

Waves near Koh Tao

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 3.1 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 11:48 am (local time).

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