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September weather forecast in Samui

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Sun

Sunday

Mon

Monday

Tue

Tuesday

Wed

Wednesday

Thu

Thursday

Fri

Friday

Sat

Saturday

31 August, sun

	757 mmHg		81%
	6.4 m/s		+30

31 August, Sunday. day, 28°; night, 26°; rain

1 September, mon

	757 mmHg		80%
	6.2 m/s		+30

1 September, Monday. day, 28°; night, 27°; partly cloudy

2 September, tue

	757 mmHg		80%
	6.2 m/s		+30

2 September, Tuesday. day, 28°; night, 27°; overcast

3 September, wed

	757 mmHg		80%
	6.5 m/s		+30

3 September, Wednesday. day, 28°; night, 27°; rain

4 September, thu

	757 mmHg		81%
	6.7 m/s		+30

4 September, Thursday. day, 28°; night, 27°; rain

5 September, fri

	757 mmHg		81%
	6.6 m/s		+30

5 September, Friday. day, 28°; night, 26°; rain

6 September, sat

	757 mmHg		81%
	6.4 m/s		+30

6 September, Saturday. day, 28°; night, 27°; rain

7 September, sun

	757 mmHg		80%
	6.5 m/s		+30

7 September, Sunday. day, 28°; night, 27°; overcast

8 September, mon

	757 mmHg		81%
	6.4 m/s		+30

8 September, Monday. day, 28°; night, 26°; overcast

9 September, tue

	757 mmHg		80%
	6.7 m/s		+30

9 September, Tuesday. day, 28°; night, 26°; rain

10 September, wed

	757 mmHg		81%
	6.8 m/s		+30

10 September, Wednesday. day, 28°; night, 26°; rain

11 September, thu

	757 mmHg		81%
	6.6 m/s		+30

11 September, Thursday. day, 28°; night, 26°; overcast

12 September, fri

	757 mmHg		81%
	6.7 m/s		+30

12 September, Friday. day, 28°; night, 26°; rain

13 September, sat

	757 mmHg		81%
	6.8 m/s		+30

13 September, Saturday. day, 28°; night, 26°; rain

14 September, sun

	757 mmHg		82%
	7.4 m/s		+30

14 September, Sunday. day, 28°; night, 26°; rain

15 September, mon

	757 mmHg		81%
	7.4 m/s		+30

15 September, Monday. day, 28°; night, 26°; rain

16 September, tue

	757 mmHg		81%
	7.5 m/s		+30

16 September, Tuesday. day, 28°; night, 26°; rain

17 September, wed

	757 mmHg		82%
	7 m/s		+30

17 September, Wednesday. day, 28°; night, 26°; overcast

18 September, thu

	757 mmHg		81%
	6.9 m/s		+30

18 September, Thursday. day, 28°; night, 26°; rain

19 September, fri

	757 mmHg		81%
	6.6 m/s		+30

19 September, Friday. day, 28°; night, 26°; rain

20 September, sat

	757 mmHg		81%
	6.3 m/s		+30

20 September, Saturday. day, 28°; night, 26°; rain

21 September, sun

	757 mmHg		81%
	6.4 m/s		+30

21 September, Sunday. day, 28°; night, 26°; rain

22 September, mon

	757 mmHg		81%
	6.2 m/s		+30

22 September, Monday. day, 28°; night, 26°; rain

23 September, tue

	757 mmHg		82%
	6.1 m/s		+30

23 September, Tuesday. day, 28°; night, 26°; rain

24 September, wed

	757 mmHg		81%
	6.5 m/s		+30

24 September, Wednesday. day, 28°; night, 26°; rain

25 September, thu

	757 mmHg		82%
	6.5 m/s		+30

25 September, Thursday. day, 28°; night, 26°; rain

26 September, fri

	757 mmHg		82%
	6.4 m/s		+30

26 September, Friday. day, 28°; night, 26°; rain

27 September, sat

	757 mmHg		82%
	6.5 m/s		+30

27 September, Saturday. day, 28°; night, 26°; rain

28 September, sun

	757 mmHg		82%
	6.3 m/s		+29

28 September, Sunday. day, 28°; night, 26°; rain

29 September, mon

	757 mmHg		81%
	6.1 m/s		+29

29 September, Monday. day, 28°; night, 26°; rain

30 September, tue

	757 mmHg		81%
	6 m/s		+29

30 September, Tuesday. day, 28°; night, 26°; rain

1 October, wed

	757 mmHg		81%
	6.1 m/s		+30

1 October, Wednesday. day, 28°; night, 26°; overcast

2 October, thu

	757 mmHg		82%
	6 m/s		+29

2 October, Thursday. day, 28°; night, 26°; rain

3 October, fri

	757 mmHg		83%
	6 m/s		+29

3 October, Friday. day, 27°; night, 26°; rain

4 October, sat

	757 mmHg		83%
	6.2 m/s		+29

4 October, Saturday. day, 27°; night, 26°; rain

Average data for 10 years

Samui September

0

sunny days

24

days with precipitation

23

cloudy days

0 sunny days; 24 days with precipitation; 23 cloudy days;

81

%

air humidity

5.1

m/s

WindSW

171

mm of precipitation

(10% of annual average)

+30

°C

Water temperature

air humidity 81%; 171 millimeters of precipitation (10% of annual average); Wind south-westerly 5.1 Meters per second; Water temperature +30°

Weather graphs for September

TemperatureWater temperaturePrecipitation chance, %Humidity, %Wind, m/sPressure, mmHg

SW

SW

W

W

W

W

SW

W

SW

W

SW

W

W

W

W

W

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

1

Average data for 10 years

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

Daytime temperature

Night-time temperature

Cities near you

Phuket
Pattaya
Khao Lak
Langkawi
Krabi
Ko Chang
Hua Hin
Sihanoukville
Phang Nga

Cities with similar weather in September

Santo Domingo
Varadero
Male
Phan Thiet
Puerto Plata
Kinshasa
Sri Jayawardenapura Kotte
Sihanoukville
Kingston

The weather forecast for September 2025 is based on historical data from the past 10 years.

In September, the weather in Samui is typically hot. Average daily high temperature in September is about 28 degrees above zero. On average, Samui has 24 rainy, 5 cloudy, and 1 partly cloudy day in September. The rains are usually heavy. September as well as May, June, July, and August is considered the most uncomfortable time to visit Samui.

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