Weather in Ko Samui

14-day forecast · updated today, Thursday, October 29, at 12:12 pm (GMT+7)

Now · drizzle 82 °F

Feels like: 88 °F
Low / high: 77 / 82 °F
Rain: 100% · 1.39 in
Wind: 13 mph SE

→ 29.93 inHg · steady UV 7 · high

Today in Ko Samui: showers, 77 °F to 82 °F, with a 100% chance of rain (1.39 in) and a moderate breeze from the southeast (13 mph). Tomorrow, drizzle, 78 °F to 84 °F and a 95% chance of rain. The warmest day of the week is Wednesday 4, at 85 °F.

Measured now at the airport

Samui (VTSM), 8.6 mi away · 1 h 14 min ago

Visibility3.7 mi

WeatherRain

Temperature81 °F

Wind13 mph from the southeast

It's what the airport's weather station measured, not a forecast: on the coast, wind and fog can be different. Airports report every 30 or 60 minutes.

Airport METAR report, via NOAA's Aviation Weather Center (aviationweather.gov). Sources and licenses

Temperatures for the next 14 days

82° 77°
Today
84° 78°
Fri 30
84° 77°
Sat 31
85° 78°
Sun 1
83° 77°
Mon 2
83° 78°
Tue 3
85° 78°
Wed 4
83° 77°
Thu 5
85° 77°
Fri 6
83° 77°
Sat 7
82° 76°
Sun 8
80° 76°
Mon 9
82° 77°
Tue 10
82° 76°
Wed 11

Day by day

Day	Sky	Low / high	Rain	Max wind	Max wave	Model
Today · 29	Showers	77 / 82 °F	100% · 1.39 in	13 mph SE	1.6 ft	ECMWF
Fri 30	Drizzle	78 / 84 °F	95% · 0.23 in	10 mph ESE	1.4 ft	ECMWF
Sat 31	Light showers	77 / 84 °F	100% · 0.44 in	12 mph ESE	1.0 ft	ECMWF
Sun 1	Drizzle	78 / 85 °F	92% · 0.16 in	8 mph E	0.7 ft	ECMWF
Mon 2	Light drizzle	77 / 83 °F	75% · 0.08 in	6 mph ENE	0.4 ft	ECMWF
Tue 3	Drizzle	78 / 83 °F	82% · 0.20 in	6 mph E	0.3 ft	ECMWF
Wed 4	Drizzle	78 / 85 °F	92% · 0.17 in	5 mph ESE	0.2 ft	ECMWF
Thu 5	Drizzle	77 / 83 °F	90% · 0.23 in	6 mph ESE	0.3 ft	ECMWF
Fri 6	Light drizzle	77 / 85 °F	92% · 0.12 in	8 mph E	0.6 ft	ECMWF
Sat 7	Light showers	77 / 83 °F	96% · 0.61 in	10 mph E	1.2 ft	ECMWF
Sun 8	Light showers	76 / 82 °F	99% · 0.87 in	10 mph E	1.4 ft	ECMWF
Mon 9	Light showers	76 / 80 °F	96% · 0.91 in	8 mph E	1.4 ft	ECMWF
Tue 10	Drizzle	77 / 82 °F	92% · 0.24 in	7 mph E	0.9 ft	ECMWF
Wed 11	Heavy drizzle	76 / 82 °F	89% · 0.43 in	7 mph E	1.2 ft	ECMWF

Each day comes from the best model covering this spot: regional ones first (HRRR and NBM in the U.S., AROME, ICON-EU), then ECMWF; day 16, NOAA GFS. Waves: Météo-France up to day 10, then ECMWF WAM, coarser and further offshore.

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
Sky	Light drizzle	Showers	Showers	Light showers	Drizzle	Heavy drizzle	Light drizzle	Light drizzle
Temperature	79°	78°	78°	79°	82°	80°	79°	79°
Chance of rain	91%	94%	97%	99%	100%	100%	78%	63%
Rain	0.01 in	0.15 in	0.15 in	0.05 in	0.02 in	0.05 in	0.02 in	0.02 in
Wind (mph)	7 ESE	6 SE	6 ESE	9 SE	12 SE	11 SE	9 SE	9 SE
Humidity	93%	95%	96%	94%	86%	91%	95%	93%
UV	0	0	0	3	7	3	0	0
Model	ECMWF	ECMWF	ECMWF	ECMWF	ECMWF	ECMWF	ECMWF	ECMWF

Do the models agree?

Medium confidence

They broadly agree, but not quite on rain tomorrow: take it with some caution.

What 4 forecast models say for the next few days. The closer they are, the more reliable the forecast.

HighRainWind

Do the models agree? · High
High (°F)	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	82°	84°	84°	85°	83°	83°	85°
AIFS	83°	83°	85°	84°	84°	83°	84°
GFS	83°	84°	85°	84°	85°	84°	84°
ICON	85°	85°	84°	85°	87°	87°	85°
Confidence	high	high	high	high	high	high	high

Do the models agree? · Rain
Rain	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	1.39 in	0.23 in	0.44 in	0.16 in	0.08 in	0.20 in	0.17 in
AIFS	1.13 in	0.24 in	0.18 in	0.15 in	0.18 in	0.50 in	0.25 in
GFS	0.77 in	0.04 in	0.01 in	0.15 in	0.28 in	0.04 in	0.15 in
ICON	0.79 in	0.37 in	0.54 in	0.35 in	0.14 in	0.42 in	0.34 in
Confidence	high	medium	medium	medium	high	medium	high

Do the models agree? · Wind
Wind (mph)	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF	1330	1023	1230	820	621	619	516
AIFS	15	13	11	10	6	11	11
GFS	1214	1011	1112	1011	1011	910	910
ICON	1023	923	618	513	512	517	619
Confidence	high	high	high	high	high	high	high

Chance of rain from the ensemble models

Model	Today	Fri 30	Sat 31	Sun 1	Mon 2	Tue 3	Wed 4
ECMWF (51 scenarios)	100%	95%	100%	92%	75%	82%	92%
GFS (GEFS, 31 scenarios)	97%	47%	60%	48%	65%	48%	27%

Each model's day runs midnight to midnight local time; models that reach fewer days are left blank. Rain: daily total. Wind: the day's highest average wind and, in small type, the strongest gust. Highlighted: values that stand out from the rest. The chance of rain comes from many runs of the same model with slightly different starting data.

Outlook

How the coming weeks and months compare with what is normal for the time of year. It is a trend, not a day-by-day forecast.

Next few weeks, compared with normal: a bit warmer, normal rain and a warmer sea.

Next 6 weeks

When	TemperatureTemp.	Rain	Sea	Typical high / low
Nov 2 – Nov 8Nov 2–Nov 8	Normal +0.7 °F	Normal	Above +1.8 °F	—
Nov 9 – Nov 15Nov 9–Nov 15	Normal +0.7 °F	A bit above +23%	A bit above +1.3 °F	—
Nov 16 – Nov 22Nov 16–Nov 22	A bit above +1.3 °F	Normal	Above +1.8 °F	83° / 80°
Nov 23 – Nov 29Nov 23–Nov 29	A bit above +2.0 °F	Normal	Above +2.3 °F	83° / 80°
Nov 30 – Dec 6Nov 30–Dec 6	A bit above +2.3 °F	Normal	Above +2.9 °F	83° / 81°

Coming months

When	TemperatureTemp.	Rain	Sea
November	A bit above +2.3 °F	A bit above +21%	Above +3.1 °F
December	Above +3.4 °F	Normal	Well above +4.0 °F
January	Above +3.6 °F	A bit below −25%	Well above +4.0 °F
February	Above +3.1 °F	Below −50%	Above +3.1 °F
March	Above +3.2 °F	Below −70%	Above +2.5 °F

Weeks: ECMWF 46-day (average of its scenarios), against the normal of the last 20 years for those dates. Months: ECMWF SEAS5. Rain: total against normal. The further ahead, the closer it gets to normal and the less detail it can give.

Ko Samui climate by monthClimate by month

Normal weather for each month (1991–2020 averages)

The best time to visit Ko Samui is in February: highs of 86 °F, about 4 rainy days a month and 8 hours of sunshine a day.

Tropical cyclones rarely pass near Ko Samui: one within 93 mi in the last 30 years (1996–2025), Pabuk, in January 2018.

85° 74°

JanJ
86° 75°

FebF
89° 76°

MarM
91° 78°

AprA
92° 78°

MayM
90° 77°

JunJ
90° 77°

JulJ
89° 77°

AugA
89° 76°

SepS
87° 75°

OctO
86° 75°

NovN
85° 74°

DecD

Highs and lows
Monthly rainfall
Best time

Month	High	Low	Rain	Rainy daysDays	Sun (h/day)	Water	Waves
JanuaryJan	85°	74°	4.52 in	8	6.9	82°	1.7 ft
FebruaryFeb	86°	75°	2.00 in	4	8.1	83°	1.6 ft
MarchMar	89°	76°	4.25 in	8	8.0	84°	1.4 ft
AprilApr	91°	78°	3.60 in	12	7.6	86°	1.0 ft
MayMay	92°	78°	4.73 in	22	5.9	87°	1.0 ft
JuneJun	90°	77°	3.17 in	21	5.6	86°	1.2 ft
JulyJul	90°	77°	3.04 in	22	5.4	85°	1.3 ft
AugustAug	89°	77°	3.49 in	21	5.4	85°	1.3 ft
SeptemberSep	89°	76°	4.42 in	24	4.9	85°	1.3 ft
OctoberOct	87°	75°	10.22 in	26	5.3	84°	1.1 ft
NovemberNov	86°	75°	14.22 in	22	5.9	83°	1.5 ft
DecemberDec	85°	74°	8.69 in	15	6.0	82°	2.0 ft

Month	Water	Waves
Jan	82°	1.7 ft
Feb	83°	1.6 ft
Mar	84°	1.4 ft
Apr	86°	1.0 ft
May	87°	1.0 ft
Jun	86°	1.2 ft
Jul	85°	1.3 ft
Aug	85°	1.3 ft
Sep	85°	1.3 ft
Oct	84°	1.1 ft
Nov	83°	1.5 ft
Dec	82°	2.0 ft

Days: rainy days in the month. Sun: hours a day.

A normal year brings 66.33 in of rain on about 205 days and about 2,300 hours of sunshine.

1991–2020 averages. Highs, lows and rainfall: TerraClimate; rainy days (0.04 in or more): NASA POWER (MERRA-2); sunshine hours: estimated from solar radiation; water: NOAA OISST; waves (average height): ERA5, 2011–2020. Normals are not a forecast: any given year can turn out very different. Sources and licenses

Temperature

Now82 °Ffeels like 88 °F

Tomorrow78 / 84 °F

It's 82 °F now (feels like 88 °F). Today, 77 °F to 82 °F; tomorrow, 78 °F to 84 °F.

Chance of rain

Today 100% 1.39 in
Fri 30 95% 0.23 in
Sat 31 100% 0.44 in
Sun 1 92% 0.16 in
Mon 2 75% 0.08 in
Tue 3 82% 0.20 in
Wed 4 92% 0.17 in

Today the chance of rain reaches 100%, with 1.39 in in total. The next day with likely rain is Friday 30: 95% and 0.23 in.

Recent rain: last 24 hours, 1.65 in; last 3 days, 3.30 in; last 7 days, 3.93 in.

Humidity and dew point

Humidity86%

Dew point77 °F

Humidity is 86% now and the dew point is 77 °F. With a dew point this high, it feels muggy.

The dew point is the temperature at which the air becomes saturated: the higher it is, the heavier the air feels.

Visibility and fog

Now15 migood

Clouds100%

Visibility is good now (15 mi). No fog expected today.

The model gives visibility up to about 15 mi: beyond that, the horizon is clear.

UV index

Now7

Today's peak7high

Fri 30: 8 · Sat 31: 8 · Sun 1: 10

Index	Level	What to do
0–2	low	No special protection needed.
3–5	moderate	Hat, sunglasses and sunscreen around midday.
6–7	high	Sunscreen, hat and shade between 12 and 4 pm.
8–10	very high	Avoid the midday sun; reflection off the water adds to it.
11+	extreme	Avoid the sun between 11 am and 5 pm; protect yourself even if it is cloudy.

Reflection off water and sand adds radiation: protect yourself more on a boat or at the beach.

Barometric pressure

↗ Rising Anglers say fish bite less for a while
→ Steady · now Anglers expect normal activity
↘ Falling Anglers say fish feed more before the change

29.8029.9030.00 29.87

Steady now (−0.02 inHg in 3 hours). It barely changes over the next 48 hours. Steady pressure: anglers expect normal activity. Fast changes, either way, tend to affect fishing.

Air and pollen

Air qualityFair · 32

Saharan dustNo

Previous days

The weather over the last 30 days, as the models analyzed it. Tap a day to see it hour by hour.

Day	Sky	Low / high	Rain	Max wind
Wed 28	Showers	76 / 81 °F	1.10 in	11 mph E
Tue 27	Light showers	76 / 82 °F	0.82 in	11 mph ESE
Mon 26	Light showers	77 / 82 °F	0.62 in	8 mph ESE
Sun 25	Light drizzle	81 / 89 °F	0.09 in	6 mph N
Sat 24	Light drizzle	81 / 89 °F	0.09 in	6 mph WNW
Fri 23	Light drizzle	80 / 91 °F	0.08 in	4 mph N
Thu 22	Light drizzle	80 / 89 °F	0.04 in	5 mph NNE

Show all 30 days

Day	Sky	Low / high	Rain	Max wind
Wed 21	Light drizzle	79 / 88 °F	0.08 in	5 mph ENE
Tue 20	Light showers	79 / 87 °F	0.39 in	3 mph SE
Mon 19	Showers	78 / 85 °F	0.63 in	5 mph NNW
Sun 18	Light showers	80 / 88 °F	0.15 in	5 mph NW
Sat 17	Heavy drizzle	83 / 92 °F	0.22 in	5 mph ENE
Fri 16	Overcast	82 / 93 °F	0	8 mph ENE
Thu 15	Light drizzle	80 / 89 °F	0.02 in	5 mph NE
Wed 14	Light showers	80 / 84 °F	0.61 in	4 mph NE
Tue 13	Drizzle	81 / 86 °F	0.26 in	6 mph ENE
Mon 12	Light showers	78 / 87 °F	0.48 in	5 mph E
Sun 11	Light showers	79 / 90 °F	0.36 in	6 mph E
Sat 10	Light drizzle	82 / 92 °F	0.01 in	10 mph NE
Fri 9	Light drizzle	81 / 90 °F	0.08 in	7 mph NNW
Thu 8	Light showers	77 / 88 °F	0.30 in	4 mph NW
Wed 7	Light showers	79 / 90 °F	0.39 in	6 mph NNW
Tue 6	Light showers	81 / 89 °F	0.26 in	7 mph WSW
Mon 5	Light drizzle	82 / 90 °F	0.06 in	7 mph W
Sun 4	Light drizzle	81 / 89 °F	0.06 in	6 mph W
Sat 3	Light showers	81 / 90 °F	0.27 in	6 mph WSW
Fri 2	Drizzle	81 / 90 °F	0.08 in	5 mph W
Thu 1	Light drizzle	78 / 89 °F	0.05 in	4 mph NNW
Wed 30	Drizzle	79 / 86 °F	0.31 in	5 mph WNW
Tue 29	Drizzle	80 / 89 °F	0.18 in	7 mph 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 weather in Ko SamuiQuestions

What's the weather like today in Ko Samui?

Showers, from 77 °F to 82 °F, with a moderate breeze from the southeast (13 mph) and a 100% chance of rain.

Will it rain tomorrow in Ko Samui?

On Friday 30 the chance of rain is 95% (0.23 in): drizzle.

How warm will it be this week?

Between a low of 77 °F and a high of 85 °F; the warmest day, Wednesday 4.

What's the UV index today?

It reaches 7 (high). Sunscreen, hat and shade between 12 and 4 pm.

Is the pressure rising or falling?

It's 29.93 inHg and steady: +0.04 inHg over the last 24 hours.

When is the best time to visit Ko Samui?

The best time to visit Ko Samui is in February: highs of 86 °F, about 4 rainy days a month and 8 hours of sunshine a day.

What is the weather like in Ko Samui in October?

In October, Ko Samui normally sees highs of 87 °F and lows of 75 °F, with about 26 rainy days (10.22 in for the month) and 5 hours of sunshine a day. The sea is around 84 °F. These are 1991–2020 averages.

What are the warmest and wettest months in Ko Samui?

The warmest is May, with average highs of 92 °F, and the coldest December, with lows of 74 °F. The wettest is November (14.22 in) and the driest, February.

More about Ko Samui today

Weather near Ko Samui

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

Learn more

Weather: Open-Meteo, CC BY 4.0, with the best model for each spot and lead time (NOAA HRRR and NBM in the U.S., Météo-France AROME, DWD ICON-EU, ECMWF IFS and NOAA GFS); ECMWF grid point 5.0 mi away. The comparison also uses ICON (DWD), AIFS (ECMWF) and ARPEGE (Météo-France). Outlook: ECMWF 46-day and SEAS5. Chance of rain from ensemble models (ECMWF, GEFS and NBM). UV, air quality and pollen: CAMS (Copernicus).

Forecast from Open-Meteo (CC BY 4.0) with models from ECMWF, NOAA, Météo-France, DWD, Copernicus Marine and CAMS. Updated at 12:12 pm (local time).

Spotted a mistake? Tell us · Where the weather and sea data come from