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September weather forecast in Ko Samet

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

	755 mmHg		84%
	4.19 m/s		+29

31 August, Sunday. day, 30°; night, 26°; rain

1 September, mon

	755 mmHg		83%
	3.9 m/s		+29

1 September, Monday. day, 31°; night, 26°; overcast

2 September, tue

	755 mmHg		83%
	3.8 m/s		+29

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

3 September, wed

	755 mmHg		83%
	3.7 m/s		+29

3 September, Wednesday. day, 31°; night, 26°; rain

4 September, thu

	755 mmHg		83%
	3.9 m/s		+29

4 September, Thursday. day, 30°; night, 26°; rain

5 September, fri

	755 mmHg		83%
	3.9 m/s		+29

5 September, Friday. day, 30°; night, 26°; rain

6 September, sat

	755 mmHg		83%
	3.7 m/s		+29

6 September, Saturday. day, 31°; night, 26°; partly cloudy

7 September, sun

	755 mmHg		84%
	3.8 m/s		+29

7 September, Sunday. day, 30°; night, 26°; rain

8 September, mon

	756 mmHg		83%
	3.7 m/s		+29

8 September, Monday. day, 31°; night, 26°; rain

9 September, tue

	755 mmHg		83%
	3.5 m/s		+29

9 September, Tuesday. day, 31°; night, 26°; rain

10 September, wed

	755 mmHg		85%
	3.5 m/s		+29

10 September, Wednesday. day, 30°; night, 25°; rain

11 September, thu

	755 mmHg		84%
	3.5 m/s		+29

11 September, Thursday. day, 30°; night, 25°; rain

12 September, fri

	755 mmHg		85%
	3.6 m/s		+29

12 September, Friday. day, 30°; night, 25°; rain

13 September, sat

	755 mmHg		84%
	3.9 m/s		+29

13 September, Saturday. day, 30°; night, 25°; rain

14 September, sun

	755 mmHg		85%
	3.9 m/s		+29

14 September, Sunday. day, 30°; night, 25°; rain

15 September, mon

	755 mmHg		84%
	3.9 m/s		+29

15 September, Monday. day, 30°; night, 25°; rain

16 September, tue

	755 mmHg		84%
	3.9 m/s		+29

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

17 September, wed

	755 mmHg		84%
	4 m/s		+29

17 September, Wednesday. day, 30°; night, 26°; rain

18 September, thu

	755 mmHg		85%
	3.6 m/s		+29

18 September, Thursday. day, 30°; night, 25°; rain

19 September, fri

	756 mmHg		85%
	3.4 m/s		+29

19 September, Friday. day, 30°; night, 25°; rain

20 September, sat

	756 mmHg		86%
	3.3 m/s		+29

20 September, Saturday. day, 30°; night, 25°; rain

21 September, sun

	756 mmHg		86%
	3.2 m/s		+29

21 September, Sunday. day, 30°; night, 25°; rain

22 September, mon

	756 mmHg		86%
	3.1 m/s		+29

22 September, Monday. day, 30°; night, 25°; rain

23 September, tue

	756 mmHg		86%
	3.1 m/s		+29

23 September, Tuesday. day, 30°; night, 25°; rain

24 September, wed

	756 mmHg		85%
	3.2 m/s		+29

24 September, Wednesday. day, 30°; night, 25°; rain

25 September, thu

	756 mmHg		85%
	3.2 m/s		+29

25 September, Thursday. day, 30°; night, 25°; rain

26 September, fri

	756 mmHg		85%
	3.1 m/s		+29

26 September, Friday. day, 30°; night, 25°; rain

27 September, sat

	756 mmHg		86%
	3.1 m/s		+29

27 September, Saturday. day, 30°; night, 25°; rain

28 September, sun

	756 mmHg		86%
	3.2 m/s		+29

28 September, Sunday. day, 30°; night, 25°; rain

29 September, mon

	756 mmHg		85%
	3.2 m/s		+29

29 September, Monday. day, 30°; night, 25°; rain

30 September, tue

	756 mmHg		86%
	3.2 m/s		+29

30 September, Tuesday. day, 30°; night, 25°; rain

1 October, wed

	756 mmHg		86%
	2.9 m/s		+29

1 October, Wednesday. day, 30°; night, 25°; rain

2 October, thu

	756 mmHg		86%
	2.7 m/s		+29

2 October, Thursday. day, 30°; night, 25°; rain

3 October, fri

	756 mmHg		86%
	2.9 m/s		+29

3 October, Friday. day, 30°; night, 25°; rain

4 October, sat

	756 mmHg		85%
	3.1 m/s		+29

4 October, Saturday. day, 30°; night, 25°; rain

Average data for 10 years

Ko Samet September

0

sunny days

28

days with precipitation

25

cloudy days

0 sunny days; 28 days with precipitation; 25 cloudy days;

85

%

air humidity

2.4

m/s

WindSW

321

mm of precipitation

(18% of annual average)

+29

°C

Water temperature

air humidity 85%; 321 millimeters of precipitation (18% of annual average); Wind south-westerly 2.4 Meters per second; Water temperature +29°

Weather graphs for September

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

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

SW

S

S

SW

SW

SW

S

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

Pattaya
Bangkok
Phú Quốc
Samui
Ko Chang
Phnom Penh
Hua Hin
Siem Reap
Sihanoukville

Cities with similar weather in September

Nha Trang
Sanya
Varadero
Punta Cana
Havana
Cancun
Boca Chica
Manila
Dadonghai

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

September in Ko Samet is the rainiest and the coldest month of the year. In September, the weather in Ko Samet is typically hot. Average daily high temperature in September is about 30 degrees above zero. On average, Ko Samet has 28 rainy, 1 cloudy, and 1 partly cloudy day in September. The rains are usually heavy. September as well as March, April, May, and June is considered the most uncomfortable time to visit Ko Samet.

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